From f04d52c2c23ac1e76f8b4f290499582c89e5005a Mon Sep 17 00:00:00 2001
From: os <os@Project.myguest.virtualbox.org>
Date: Wed, 29 Nov 2023 14:19:51 -0500
Subject: [PATCH] ran sh command

---
 Part4/10_scheduler/e_compile.sh |    0
 Part4/10_scheduler/globals.s    |  182 ++++
 Part4/10_scheduler/hello.s      |  871 ++++++++++++++++++
 Part4/10_scheduler/idt.s        |  560 ++++++++++++
 Part4/10_scheduler/interrupt.o  |  Bin 0 -> 2128 bytes
 Part4/10_scheduler/isr.s        | 1518 +++++++++++++++++++++++++++++++
 Part4/10_scheduler/keyboard.s   |  965 ++++++++++++++++++++
 Part4/10_scheduler/mem.s        |  673 ++++++++++++++
 Part4/10_scheduler/ports.s      |  501 ++++++++++
 Part4/10_scheduler/s_compile.sh |    0
 Part4/10_scheduler/screen.s     | 1345 +++++++++++++++++++++++++++
 Part4/10_scheduler/string.s     |  998 ++++++++++++++++++++
 Part4/10_scheduler/timer.s      |  601 ++++++++++++
 13 files changed, 8214 insertions(+)
 mode change 100644 => 100755 Part4/10_scheduler/e_compile.sh
 create mode 100644 Part4/10_scheduler/globals.s
 create mode 100644 Part4/10_scheduler/hello.s
 create mode 100644 Part4/10_scheduler/idt.s
 create mode 100644 Part4/10_scheduler/interrupt.o
 create mode 100644 Part4/10_scheduler/isr.s
 create mode 100644 Part4/10_scheduler/keyboard.s
 create mode 100644 Part4/10_scheduler/mem.s
 create mode 100644 Part4/10_scheduler/ports.s
 mode change 100644 => 100755 Part4/10_scheduler/s_compile.sh
 create mode 100644 Part4/10_scheduler/screen.s
 create mode 100644 Part4/10_scheduler/string.s
 create mode 100644 Part4/10_scheduler/timer.s

diff --git a/Part4/10_scheduler/e_compile.sh b/Part4/10_scheduler/e_compile.sh
old mode 100644
new mode 100755
diff --git a/Part4/10_scheduler/globals.s b/Part4/10_scheduler/globals.s
new file mode 100644
index 0000000..9271d10
--- /dev/null
+++ b/Part4/10_scheduler/globals.s
@@ -0,0 +1,182 @@
+	.file	"globals.c"
+	.text
+.Ltext0:
+	.comm	free_mem_addr,4,4
+	.comm	global_id,4,4
+	.comm	memory_limit,4,4
+.Letext0:
+	.file 1 "./libc/globals.c"
+	.file 2 "./libc/../cpu/types.h"
+	.section	.debug_info,"",@progbits
+.Ldebug_info0:
+	.long	0x82
+	.value	0x4
+	.long	.Ldebug_abbrev0
+	.byte	0x4
+	.uleb128 0x1
+	.long	.LASF8
+	.byte	0xc
+	.long	.LASF9
+	.long	.LASF10
+	.long	.Ldebug_line0
+	.uleb128 0x2
+	.string	"u32"
+	.byte	0x2
+	.byte	0x6
+	.long	0x28
+	.uleb128 0x3
+	.byte	0x4
+	.byte	0x7
+	.long	.LASF0
+	.uleb128 0x4
+	.byte	0x4
+	.byte	0x5
+	.string	"int"
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x7
+	.long	.LASF1
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x5
+	.long	.LASF2
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x8
+	.long	.LASF3
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x6
+	.long	.LASF4
+	.uleb128 0x5
+	.long	.LASF5
+	.byte	0x1
+	.byte	0x3
+	.long	0x1d
+	.uleb128 0x5
+	.byte	0x3
+	.long	free_mem_addr
+	.uleb128 0x5
+	.long	.LASF6
+	.byte	0x1
+	.byte	0x4
+	.long	0x1d
+	.uleb128 0x5
+	.byte	0x3
+	.long	global_id
+	.uleb128 0x5
+	.long	.LASF7
+	.byte	0x1
+	.byte	0x5
+	.long	0x1d
+	.uleb128 0x5
+	.byte	0x3
+	.long	memory_limit
+	.byte	0
+	.section	.debug_abbrev,"",@progbits
+.Ldebug_abbrev0:
+	.uleb128 0x1
+	.uleb128 0x11
+	.byte	0x1
+	.uleb128 0x25
+	.uleb128 0xe
+	.uleb128 0x13
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x1b
+	.uleb128 0xe
+	.uleb128 0x10
+	.uleb128 0x17
+	.byte	0
+	.byte	0
+	.uleb128 0x2
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.byte	0
+	.byte	0
+	.uleb128 0x4
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0x8
+	.byte	0
+	.byte	0
+	.uleb128 0x5
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.byte	0
+	.section	.debug_aranges,"",@progbits
+	.long	0x14
+	.value	0x2
+	.long	.Ldebug_info0
+	.byte	0x4
+	.byte	0
+	.value	0
+	.value	0
+	.long	0
+	.long	0
+	.section	.debug_line,"",@progbits
+.Ldebug_line0:
+	.section	.debug_str,"MS",@progbits,1
+.LASF0:
+	.string	"unsigned int"
+.LASF6:
+	.string	"global_id"
+.LASF10:
+	.string	"/home/os/OS_Project/Part4/10_scheduler"
+.LASF3:
+	.string	"unsigned char"
+.LASF8:
+	.string	"GNU C11 5.4.0 20160609 -m32 -mtune=generic -march=i686 -g -fno-pie -ffreestanding -fno-builtin -fno-stack-protector"
+.LASF2:
+	.string	"short int"
+.LASF5:
+	.string	"free_mem_addr"
+.LASF7:
+	.string	"memory_limit"
+.LASF1:
+	.string	"short unsigned int"
+.LASF4:
+	.string	"char"
+.LASF9:
+	.string	"./libc/globals.c"
+	.ident	"GCC: (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609"
+	.section	.note.GNU-stack,"",@progbits
diff --git a/Part4/10_scheduler/hello.s b/Part4/10_scheduler/hello.s
new file mode 100644
index 0000000..db0acd8
--- /dev/null
+++ b/Part4/10_scheduler/hello.s
@@ -0,0 +1,871 @@
+	.file	"hello.c"
+	.text
+.Ltext0:
+	.comm	idt,2048,32
+	.comm	idt_reg,6,4
+	.section	.rodata
+.LC0:
+	.string	"Process "
+	.align 4
+.LC1:
+	.string	"has been entered.  Hey there.\n"
+	.text
+	.globl	start_
+	.type	start_, @function
+start_:
+.LFB0:
+	.file 1 "hello.c"
+	.loc 1 18 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$40, %esp
+	.loc 1 19 0
+	movl	$0, -12(%ebp)
+	.loc 1 21 0
+	subl	$12, %esp
+	pushl	$.LC0
+	call	kprint
+	addl	$16, %esp
+	.loc 1 22 0
+	subl	$8, %esp
+	leal	-28(%ebp), %eax
+	pushl	%eax
+	pushl	-12(%ebp)
+	call	hex_to_ascii
+	addl	$16, %esp
+	.loc 1 23 0
+	subl	$12, %esp
+	leal	-28(%ebp), %eax
+	pushl	%eax
+	call	kprint
+	addl	$16, %esp
+	.loc 1 24 0
+	subl	$12, %esp
+	pushl	$.LC1
+	call	kprint
+	addl	$16, %esp
+	.loc 1 25 0
+	nop
+	.loc 1 26 0
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE0:
+	.size	start_, .-start_
+	.section	.rodata
+.LC2:
+	.string	"END"
+.LC3:
+	.string	"Stopping the CPU. Bye!\n"
+.LC4:
+	.string	"ADD"
+.LC5:
+	.string	"ADDED: "
+.LC6:
+	.string	"  id:  "
+.LC7:
+	.string	"ZOO"
+.LC8:
+	.string	"ZOO.\n"
+.LC9:
+	.string	"You said: "
+.LC10:
+	.string	"\n> "
+	.text
+	.globl	user_input
+	.type	user_input, @function
+user_input:
+.LFB1:
+	.loc 1 28 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$40, %esp
+	.loc 1 29 0
+	subl	$8, %esp
+	pushl	$.LC2
+	pushl	8(%ebp)
+	call	strcmp
+	addl	$16, %esp
+	testl	%eax, %eax
+	jne	.L4
+	.loc 1 30 0
+	subl	$12, %esp
+	pushl	$.LC3
+	call	kprint
+	addl	$16, %esp
+	.loc 1 31 0
+#APP
+# 31 "hello.c" 1
+	hlt
+# 0 "" 2
+#NO_APP
+	jmp	.L5
+.L4:
+	.loc 1 32 0
+	subl	$8, %esp
+	pushl	$.LC4
+	pushl	8(%ebp)
+	call	strcmp
+	addl	$16, %esp
+	testl	%eax, %eax
+	jne	.L6
+.LBB2:
+	.loc 1 33 0
+	movl	$16, -12(%ebp)
+	addl	$4, -12(%ebp)
+	.loc 1 34 0
+	movl	$0, -16(%ebp)
+	.loc 1 35 0
+	subl	$4, %esp
+	leal	-16(%ebp), %eax
+	pushl	%eax
+	pushl	$0
+	pushl	$20
+	call	kmalloc
+	addl	$16, %esp
+	.loc 1 36 0
+	movl	-16(%ebp), %edx
+	movl	global_id, %eax
+	leal	1(%eax), %ecx
+	movl	%ecx, global_id
+	movl	%eax, (%edx)
+	.loc 1 37 0
+	movl	-16(%ebp), %eax
+	movl	global_id, %edx
+	imull	$100, %edx, %edx
+	movl	%edx, 4(%eax)
+	.loc 1 38 0
+	movl	-16(%ebp), %ecx
+	movl	global_id, %edx
+	movl	%edx, %eax
+	sall	$2, %eax
+	addl	%edx, %eax
+	addl	%eax, %eax
+	movl	%eax, 8(%ecx)
+	.loc 1 39 0
+	movl	-16(%ebp), %eax
+	movl	$0, 12(%eax)
+	.loc 1 40 0
+	movl	-16(%ebp), %eax
+	movl	$0, 16(%eax)
+	.loc 1 41 0
+	subl	$12, %esp
+	pushl	$.LC5
+	call	kprint
+	addl	$16, %esp
+	.loc 1 43 0
+	movl	-16(%ebp), %eax
+	movl	%eax, %edx
+	subl	$8, %esp
+	leal	-32(%ebp), %eax
+	pushl	%eax
+	pushl	%edx
+	call	hex_to_ascii
+	addl	$16, %esp
+	.loc 1 44 0
+	subl	$12, %esp
+	leal	-32(%ebp), %eax
+	pushl	%eax
+	call	kprint
+	addl	$16, %esp
+	.loc 1 45 0
+	subl	$12, %esp
+	pushl	$.LC6
+	call	kprint
+	addl	$16, %esp
+	.loc 1 46 0
+	movl	-16(%ebp), %eax
+	movl	(%eax), %eax
+	movl	%eax, %edx
+	subl	$8, %esp
+	leal	-32(%ebp), %eax
+	pushl	%eax
+	pushl	%edx
+	call	hex_to_ascii
+	addl	$16, %esp
+	.loc 1 47 0
+	subl	$12, %esp
+	leal	-32(%ebp), %eax
+	pushl	%eax
+	call	kprint
+	addl	$16, %esp
+.LBE2:
+	jmp	.L5
+.L6:
+	.loc 1 48 0
+	subl	$8, %esp
+	pushl	$.LC7
+	pushl	8(%ebp)
+	call	strcmp
+	addl	$16, %esp
+	testl	%eax, %eax
+	jne	.L5
+	.loc 1 49 0
+	subl	$12, %esp
+	pushl	$.LC8
+	call	kprint
+	addl	$16, %esp
+.L5:
+	.loc 1 52 0
+	subl	$12, %esp
+	pushl	$.LC9
+	call	kprint
+	addl	$16, %esp
+	.loc 1 53 0
+	subl	$12, %esp
+	pushl	8(%ebp)
+	call	kprint
+	addl	$16, %esp
+	.loc 1 54 0
+	subl	$12, %esp
+	pushl	$.LC10
+	call	kprint
+	addl	$16, %esp
+	.loc 1 55 0
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE1:
+	.size	user_input, .-user_input
+.Letext0:
+	.file 2 "./cpu/types.h"
+	.file 3 "./cpu/idt.h"
+	.file 4 "./libc/mem.h"
+	.file 5 "./libc/globals.h"
+	.section	.debug_info,"",@progbits
+.Ldebug_info0:
+	.long	0x22b
+	.value	0x4
+	.long	.Ldebug_abbrev0
+	.byte	0x4
+	.uleb128 0x1
+	.long	.LASF22
+	.byte	0xc
+	.long	.LASF23
+	.long	.LASF24
+	.long	.Ltext0
+	.long	.Letext0-.Ltext0
+	.long	.Ldebug_line0
+	.uleb128 0x2
+	.string	"u32"
+	.byte	0x2
+	.byte	0x6
+	.long	0x30
+	.uleb128 0x3
+	.byte	0x4
+	.byte	0x7
+	.long	.LASF0
+	.uleb128 0x4
+	.byte	0x4
+	.byte	0x5
+	.string	"int"
+	.uleb128 0x2
+	.string	"u16"
+	.byte	0x2
+	.byte	0x8
+	.long	0x49
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x7
+	.long	.LASF1
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x5
+	.long	.LASF2
+	.uleb128 0x2
+	.string	"u8"
+	.byte	0x2
+	.byte	0xa
+	.long	0x61
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x8
+	.long	.LASF3
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x6
+	.long	.LASF4
+	.uleb128 0x5
+	.byte	0x8
+	.byte	0x3
+	.byte	0xa
+	.long	0xb4
+	.uleb128 0x6
+	.long	.LASF5
+	.byte	0x3
+	.byte	0xb
+	.long	0x3e
+	.byte	0
+	.uleb128 0x7
+	.string	"sel"
+	.byte	0x3
+	.byte	0xc
+	.long	0x3e
+	.byte	0x2
+	.uleb128 0x6
+	.long	.LASF6
+	.byte	0x3
+	.byte	0xd
+	.long	0x57
+	.byte	0x4
+	.uleb128 0x6
+	.long	.LASF7
+	.byte	0x3
+	.byte	0x13
+	.long	0x57
+	.byte	0x5
+	.uleb128 0x6
+	.long	.LASF8
+	.byte	0x3
+	.byte	0x14
+	.long	0x3e
+	.byte	0x6
+	.byte	0
+	.uleb128 0x8
+	.long	.LASF9
+	.byte	0x3
+	.byte	0x15
+	.long	0x6f
+	.uleb128 0x5
+	.byte	0x6
+	.byte	0x3
+	.byte	0x19
+	.long	0xe0
+	.uleb128 0x6
+	.long	.LASF10
+	.byte	0x3
+	.byte	0x1a
+	.long	0x3e
+	.byte	0
+	.uleb128 0x6
+	.long	.LASF11
+	.byte	0x3
+	.byte	0x1b
+	.long	0x25
+	.byte	0x2
+	.byte	0
+	.uleb128 0x8
+	.long	.LASF12
+	.byte	0x3
+	.byte	0x1c
+	.long	0xbf
+	.uleb128 0x9
+	.long	.LASF25
+	.byte	0x14
+	.byte	0x4
+	.byte	0x9
+	.long	0x133
+	.uleb128 0x7
+	.string	"id"
+	.byte	0x4
+	.byte	0xa
+	.long	0x25
+	.byte	0
+	.uleb128 0x6
+	.long	.LASF11
+	.byte	0x4
+	.byte	0xb
+	.long	0x25
+	.byte	0x4
+	.uleb128 0x6
+	.long	.LASF13
+	.byte	0x4
+	.byte	0xc
+	.long	0x25
+	.byte	0x8
+	.uleb128 0x6
+	.long	.LASF14
+	.byte	0x4
+	.byte	0xd
+	.long	0x133
+	.byte	0xc
+	.uleb128 0x6
+	.long	.LASF15
+	.byte	0x4
+	.byte	0xe
+	.long	0x133
+	.byte	0x10
+	.byte	0
+	.uleb128 0xa
+	.byte	0x4
+	.long	0xeb
+	.uleb128 0x8
+	.long	.LASF16
+	.byte	0x4
+	.byte	0xf
+	.long	0xeb
+	.uleb128 0xb
+	.long	.LASF18
+	.byte	0x1
+	.byte	0x11
+	.long	.LFB0
+	.long	.LFE0-.LFB0
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x174
+	.uleb128 0xc
+	.string	"pid"
+	.byte	0x1
+	.byte	0x13
+	.long	0x37
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -20
+	.uleb128 0xc
+	.string	"c"
+	.byte	0x1
+	.byte	0x14
+	.long	0x174
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -36
+	.byte	0
+	.uleb128 0xd
+	.long	0x68
+	.long	0x184
+	.uleb128 0xe
+	.long	0x184
+	.byte	0xf
+	.byte	0
+	.uleb128 0x3
+	.byte	0x4
+	.byte	0x7
+	.long	.LASF17
+	.uleb128 0xb
+	.long	.LASF19
+	.byte	0x1
+	.byte	0x1c
+	.long	.LFB1
+	.long	.LFE1-.LFB1
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x1df
+	.uleb128 0xf
+	.long	.LASF26
+	.byte	0x1
+	.byte	0x1c
+	.long	0x1df
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.uleb128 0x10
+	.long	.LBB2
+	.long	.LBE2-.LBB2
+	.uleb128 0xc
+	.string	"n0"
+	.byte	0x1
+	.byte	0x21
+	.long	0x1e5
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -20
+	.uleb128 0xc
+	.string	"n1"
+	.byte	0x1
+	.byte	0x22
+	.long	0x1eb
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -24
+	.uleb128 0xc
+	.string	"c"
+	.byte	0x1
+	.byte	0x2a
+	.long	0x174
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -40
+	.byte	0
+	.byte	0
+	.uleb128 0xa
+	.byte	0x4
+	.long	0x68
+	.uleb128 0xa
+	.byte	0x4
+	.long	0x25
+	.uleb128 0xa
+	.byte	0x4
+	.long	0x139
+	.uleb128 0x11
+	.long	.LASF20
+	.byte	0x5
+	.byte	0x6
+	.long	0x25
+	.uleb128 0xd
+	.long	0xb4
+	.long	0x20c
+	.uleb128 0xe
+	.long	0x184
+	.byte	0xff
+	.byte	0
+	.uleb128 0x12
+	.string	"idt"
+	.byte	0x3
+	.byte	0x1f
+	.long	0x1fc
+	.uleb128 0x5
+	.byte	0x3
+	.long	idt
+	.uleb128 0x13
+	.long	.LASF21
+	.byte	0x3
+	.byte	0x20
+	.long	0xe0
+	.uleb128 0x5
+	.byte	0x3
+	.long	idt_reg
+	.byte	0
+	.section	.debug_abbrev,"",@progbits
+.Ldebug_abbrev0:
+	.uleb128 0x1
+	.uleb128 0x11
+	.byte	0x1
+	.uleb128 0x25
+	.uleb128 0xe
+	.uleb128 0x13
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x1b
+	.uleb128 0xe
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x10
+	.uleb128 0x17
+	.byte	0
+	.byte	0
+	.uleb128 0x2
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.byte	0
+	.byte	0
+	.uleb128 0x4
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0x8
+	.byte	0
+	.byte	0
+	.uleb128 0x5
+	.uleb128 0x13
+	.byte	0x1
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x6
+	.uleb128 0xd
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x38
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0x7
+	.uleb128 0xd
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x38
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0x8
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x9
+	.uleb128 0x13
+	.byte	0x1
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xa
+	.uleb128 0xf
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2116
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xc
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0xd
+	.uleb128 0x1
+	.byte	0x1
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xe
+	.uleb128 0x21
+	.byte	0
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2f
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0xf
+	.uleb128 0x5
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x10
+	.uleb128 0xb
+	.byte	0x1
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.byte	0
+	.byte	0
+	.uleb128 0x11
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3c
+	.uleb128 0x19
+	.byte	0
+	.byte	0
+	.uleb128 0x12
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x13
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.byte	0
+	.section	.debug_aranges,"",@progbits
+	.long	0x1c
+	.value	0x2
+	.long	.Ldebug_info0
+	.byte	0x4
+	.byte	0
+	.value	0
+	.value	0
+	.long	.Ltext0
+	.long	.Letext0-.Ltext0
+	.long	0
+	.long	0
+	.section	.debug_line,"",@progbits
+.Ldebug_line0:
+	.section	.debug_str,"MS",@progbits,1
+.LASF5:
+	.string	"low_offset"
+.LASF9:
+	.string	"idt_gate_t"
+.LASF14:
+	.string	"next"
+.LASF23:
+	.string	"hello.c"
+.LASF21:
+	.string	"idt_reg"
+.LASF19:
+	.string	"user_input"
+.LASF15:
+	.string	"previous"
+.LASF3:
+	.string	"unsigned char"
+.LASF11:
+	.string	"base"
+.LASF1:
+	.string	"short unsigned int"
+.LASF25:
+	.string	"_node"
+.LASF6:
+	.string	"always0"
+.LASF0:
+	.string	"unsigned int"
+.LASF7:
+	.string	"flags"
+.LASF26:
+	.string	"input"
+.LASF4:
+	.string	"char"
+.LASF22:
+	.string	"GNU C11 5.4.0 20160609 -m32 -mtune=generic -march=i686 -g -fno-pie -ffreestanding -fno-builtin -fno-stack-protector"
+.LASF10:
+	.string	"limit"
+.LASF17:
+	.string	"sizetype"
+.LASF24:
+	.string	"/home/os/OS_Project/Part4/10_scheduler"
+.LASF20:
+	.string	"global_id"
+.LASF2:
+	.string	"short int"
+.LASF18:
+	.string	"start_"
+.LASF16:
+	.string	"node"
+.LASF8:
+	.string	"high_offset"
+.LASF12:
+	.string	"idt_register_t"
+.LASF13:
+	.string	"size"
+	.ident	"GCC: (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609"
+	.section	.note.GNU-stack,"",@progbits
diff --git a/Part4/10_scheduler/idt.s b/Part4/10_scheduler/idt.s
new file mode 100644
index 0000000..6d8f669
--- /dev/null
+++ b/Part4/10_scheduler/idt.s
@@ -0,0 +1,560 @@
+	.file	"idt.c"
+	.text
+.Ltext0:
+	.comm	idt,2048,32
+	.comm	idt_reg,6,4
+	.globl	set_idt_gate
+	.type	set_idt_gate, @function
+set_idt_gate:
+.LFB0:
+	.file 1 "./cpu/idt.c"
+	.loc 1 3 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	.loc 1 4 0
+	movl	12(%ebp), %eax
+	movl	%eax, %edx
+	movl	8(%ebp), %eax
+	movw	%dx, idt(,%eax,8)
+	.loc 1 5 0
+	movl	8(%ebp), %eax
+	movw	$8, idt+2(,%eax,8)
+	.loc 1 6 0
+	movl	8(%ebp), %eax
+	movb	$0, idt+4(,%eax,8)
+	.loc 1 7 0
+	movl	8(%ebp), %eax
+	movb	$-114, idt+5(,%eax,8)
+	.loc 1 8 0
+	movl	12(%ebp), %eax
+	shrl	$16, %eax
+	movl	%eax, %edx
+	movl	8(%ebp), %eax
+	movw	%dx, idt+6(,%eax,8)
+	.loc 1 9 0
+	nop
+	popl	%ebp
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE0:
+	.size	set_idt_gate, .-set_idt_gate
+	.globl	set_idt
+	.type	set_idt, @function
+set_idt:
+.LFB1:
+	.loc 1 11 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	.loc 1 12 0
+	movl	$idt, %eax
+	movl	%eax, idt_reg+2
+	.loc 1 13 0
+	movw	$2047, idt_reg
+	.loc 1 15 0
+	movl	$idt_reg, %eax
+#APP
+# 15 "./cpu/idt.c" 1
+	lidtl (%eax)
+# 0 "" 2
+	.loc 1 16 0
+#NO_APP
+	nop
+	popl	%ebp
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE1:
+	.size	set_idt, .-set_idt
+.Letext0:
+	.file 2 "./cpu/types.h"
+	.file 3 "./cpu/idt.h"
+	.section	.debug_info,"",@progbits
+.Ldebug_info0:
+	.long	0x162
+	.value	0x4
+	.long	.Ldebug_abbrev0
+	.byte	0x4
+	.uleb128 0x1
+	.long	.LASF16
+	.byte	0xc
+	.long	.LASF17
+	.long	.LASF18
+	.long	.Ltext0
+	.long	.Letext0-.Ltext0
+	.long	.Ldebug_line0
+	.uleb128 0x2
+	.string	"u32"
+	.byte	0x2
+	.byte	0x6
+	.long	0x30
+	.uleb128 0x3
+	.byte	0x4
+	.byte	0x7
+	.long	.LASF0
+	.uleb128 0x4
+	.byte	0x4
+	.byte	0x5
+	.string	"int"
+	.uleb128 0x2
+	.string	"u16"
+	.byte	0x2
+	.byte	0x8
+	.long	0x49
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x7
+	.long	.LASF1
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x5
+	.long	.LASF2
+	.uleb128 0x2
+	.string	"u8"
+	.byte	0x2
+	.byte	0xa
+	.long	0x61
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x8
+	.long	.LASF3
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x6
+	.long	.LASF4
+	.uleb128 0x5
+	.byte	0x8
+	.byte	0x3
+	.byte	0xa
+	.long	0xb4
+	.uleb128 0x6
+	.long	.LASF5
+	.byte	0x3
+	.byte	0xb
+	.long	0x3e
+	.byte	0
+	.uleb128 0x7
+	.string	"sel"
+	.byte	0x3
+	.byte	0xc
+	.long	0x3e
+	.byte	0x2
+	.uleb128 0x6
+	.long	.LASF6
+	.byte	0x3
+	.byte	0xd
+	.long	0x57
+	.byte	0x4
+	.uleb128 0x6
+	.long	.LASF7
+	.byte	0x3
+	.byte	0x13
+	.long	0x57
+	.byte	0x5
+	.uleb128 0x6
+	.long	.LASF8
+	.byte	0x3
+	.byte	0x14
+	.long	0x3e
+	.byte	0x6
+	.byte	0
+	.uleb128 0x8
+	.long	.LASF9
+	.byte	0x3
+	.byte	0x15
+	.long	0x6f
+	.uleb128 0x5
+	.byte	0x6
+	.byte	0x3
+	.byte	0x19
+	.long	0xe0
+	.uleb128 0x6
+	.long	.LASF10
+	.byte	0x3
+	.byte	0x1a
+	.long	0x3e
+	.byte	0
+	.uleb128 0x6
+	.long	.LASF11
+	.byte	0x3
+	.byte	0x1b
+	.long	0x25
+	.byte	0x2
+	.byte	0
+	.uleb128 0x8
+	.long	.LASF12
+	.byte	0x3
+	.byte	0x1c
+	.long	0xbf
+	.uleb128 0x9
+	.long	.LASF19
+	.byte	0x1
+	.byte	0x3
+	.long	.LFB0
+	.long	.LFE0-.LFB0
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x11b
+	.uleb128 0xa
+	.string	"n"
+	.byte	0x1
+	.byte	0x3
+	.long	0x37
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.uleb128 0xb
+	.long	.LASF13
+	.byte	0x1
+	.byte	0x3
+	.long	0x25
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 4
+	.byte	0
+	.uleb128 0xc
+	.long	.LASF20
+	.byte	0x1
+	.byte	0xb
+	.long	.LFB1
+	.long	.LFE1-.LFB1
+	.uleb128 0x1
+	.byte	0x9c
+	.uleb128 0xd
+	.long	0xb4
+	.long	0x13c
+	.uleb128 0xe
+	.long	0x13c
+	.byte	0xff
+	.byte	0
+	.uleb128 0x3
+	.byte	0x4
+	.byte	0x7
+	.long	.LASF14
+	.uleb128 0xf
+	.string	"idt"
+	.byte	0x3
+	.byte	0x1f
+	.long	0x12c
+	.uleb128 0x5
+	.byte	0x3
+	.long	idt
+	.uleb128 0x10
+	.long	.LASF15
+	.byte	0x3
+	.byte	0x20
+	.long	0xe0
+	.uleb128 0x5
+	.byte	0x3
+	.long	idt_reg
+	.byte	0
+	.section	.debug_abbrev,"",@progbits
+.Ldebug_abbrev0:
+	.uleb128 0x1
+	.uleb128 0x11
+	.byte	0x1
+	.uleb128 0x25
+	.uleb128 0xe
+	.uleb128 0x13
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x1b
+	.uleb128 0xe
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x10
+	.uleb128 0x17
+	.byte	0
+	.byte	0
+	.uleb128 0x2
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.byte	0
+	.byte	0
+	.uleb128 0x4
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0x8
+	.byte	0
+	.byte	0
+	.uleb128 0x5
+	.uleb128 0x13
+	.byte	0x1
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x6
+	.uleb128 0xd
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x38
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0x7
+	.uleb128 0xd
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x38
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0x8
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x9
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2117
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xa
+	.uleb128 0x5
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0x5
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0xc
+	.uleb128 0x2e
+	.byte	0
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2117
+	.uleb128 0x19
+	.byte	0
+	.byte	0
+	.uleb128 0xd
+	.uleb128 0x1
+	.byte	0x1
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xe
+	.uleb128 0x21
+	.byte	0
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2f
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0xf
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x10
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.byte	0
+	.section	.debug_aranges,"",@progbits
+	.long	0x1c
+	.value	0x2
+	.long	.Ldebug_info0
+	.byte	0x4
+	.byte	0
+	.value	0
+	.value	0
+	.long	.Ltext0
+	.long	.Letext0-.Ltext0
+	.long	0
+	.long	0
+	.section	.debug_line,"",@progbits
+.Ldebug_line0:
+	.section	.debug_str,"MS",@progbits,1
+.LASF8:
+	.string	"high_offset"
+.LASF0:
+	.string	"unsigned int"
+.LASF17:
+	.string	"./cpu/idt.c"
+.LASF7:
+	.string	"flags"
+.LASF9:
+	.string	"idt_gate_t"
+.LASF13:
+	.string	"handler"
+.LASF18:
+	.string	"/home/os/OS_Project/Part4/10_scheduler"
+.LASF10:
+	.string	"limit"
+.LASF12:
+	.string	"idt_register_t"
+.LASF11:
+	.string	"base"
+.LASF6:
+	.string	"always0"
+.LASF4:
+	.string	"char"
+.LASF19:
+	.string	"set_idt_gate"
+.LASF5:
+	.string	"low_offset"
+.LASF16:
+	.string	"GNU C11 5.4.0 20160609 -m32 -mtune=generic -march=i686 -g -fno-pie -ffreestanding -fno-builtin -fno-stack-protector"
+.LASF1:
+	.string	"short unsigned int"
+.LASF3:
+	.string	"unsigned char"
+.LASF2:
+	.string	"short int"
+.LASF15:
+	.string	"idt_reg"
+.LASF20:
+	.string	"set_idt"
+.LASF14:
+	.string	"sizetype"
+	.ident	"GCC: (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609"
+	.section	.note.GNU-stack,"",@progbits
diff --git a/Part4/10_scheduler/interrupt.o b/Part4/10_scheduler/interrupt.o
new file mode 100644
index 0000000000000000000000000000000000000000..67b173a4f71b53a8bb8239a7f14b21ea18f5763b
GIT binary patch
literal 2128
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z5CxH-?1B^sg@r_D^kNW5g)dYL!WYsDUu1-2MCgy_)m}v4wDtY{?s?`<=uHRC`F%d;
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z_zaht_!O6P{0W!Z_#-Zv_!yVE_$ZfpI)KOBwpl7kHMW5YLJKG_bs=q+x`?((ZKM~a
zE~ZUVjcuX<PtDZrX$f_BYN1w7OR34z1C;T!jAsAg=NtPV&3IZ)H$6Q>*FCk;RZlDE
zvZs}F-cuW$^|Xq<_Vh5F^7IIu@boBsBb2i3bVjJgK1QDjrELd&EL3YBr}u?2b~POq
zs<WN+u28*wg2siib`6aPHP|O<NN9n5ina<Zv|aR^&?38*o)K!a-P9|z*ygBHsLA$F
z8whtnMy@=%w`_8y-KDZC=SM*Miq-1fjgD8(B#HZKa{qX<*38VeW#`|-Zie}hG8@6G
zl`os;>V4&VoD9DITQFbp8_nqV8hD%XH^D>7cYueL=fPvjnTyKb0hg6ef)6O40v}br
zAN-;6L*Nt2`RwP)KLDRrejGfloU`95KM6js{0s19<zIoXD(7C;m7fLQRDKRTqx>Rx
zR{4+MjQ=6>_xB3CNjX2ORrxRQ4&}eWyOsY5A5b2{H!0_Ld0F}2@Hdp-g%2xFgA2;D
z;F9u2@ImD*;P;d-2On472L4oeJNQfGo#1KZUEuGP^WXhT%KO1rls^mpSvi00zboGi
zj+Ji#|E2tO@SJj!>)AOu)l--#k2*IsS<dB4MN=rb;obR(UE`z96kK$VvA=UqvAAbq
zxKy4Rk<ae)lI!Jgz)Q$WA1~{8>E~rVF9W=6;N@vvf@(xEfrJ7{1riG+7f3LWWFXN%
zvY}+d>hmNUN;Z^iDA`c5p=3kJhLY`*Y#*{N0=h^DO<aT?E<y_zp@WOiz(vTr2yqu7
fjl<Q5WcaPIBPo7sa6hh@j25gl8QfW}_}}_33k>`y

literal 0
HcmV?d00001

diff --git a/Part4/10_scheduler/isr.s b/Part4/10_scheduler/isr.s
new file mode 100644
index 0000000..60533ae
--- /dev/null
+++ b/Part4/10_scheduler/isr.s
@@ -0,0 +1,1518 @@
+	.file	"isr.c"
+	.text
+.Ltext0:
+	.comm	idt,2048,32
+	.comm	idt_reg,6,4
+	.comm	interrupt_handlers,1024,32
+	.globl	isr_install
+	.type	isr_install, @function
+isr_install:
+.LFB0:
+	.file 1 "./cpu/isr.c"
+	.loc 1 13 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$8, %esp
+	.loc 1 14 0
+	movl	$isr0, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$0
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 15 0
+	movl	$isr1, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$1
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 16 0
+	movl	$isr2, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$2
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 17 0
+	movl	$isr3, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$3
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 18 0
+	movl	$isr4, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$4
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 19 0
+	movl	$isr5, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$5
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 20 0
+	movl	$isr6, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$6
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 21 0
+	movl	$isr7, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$7
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 22 0
+	movl	$isr8, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$8
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 23 0
+	movl	$isr9, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$9
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 24 0
+	movl	$isr10, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$10
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 25 0
+	movl	$isr11, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$11
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 26 0
+	movl	$isr12, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$12
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 27 0
+	movl	$isr13, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$13
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 28 0
+	movl	$isr14, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$14
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 29 0
+	movl	$isr15, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$15
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 30 0
+	movl	$isr16, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$16
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 31 0
+	movl	$isr17, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$17
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 32 0
+	movl	$isr18, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$18
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 33 0
+	movl	$isr19, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$19
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 34 0
+	movl	$isr20, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$20
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 35 0
+	movl	$isr21, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$21
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 36 0
+	movl	$isr22, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$22
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 37 0
+	movl	$isr23, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$23
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 38 0
+	movl	$isr24, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$24
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 39 0
+	movl	$isr25, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$25
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 40 0
+	movl	$isr26, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$26
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 41 0
+	movl	$isr27, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$27
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 42 0
+	movl	$isr28, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$28
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 43 0
+	movl	$isr29, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$29
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 44 0
+	movl	$isr30, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$30
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 45 0
+	movl	$isr31, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$31
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 48 0
+	subl	$8, %esp
+	pushl	$17
+	pushl	$32
+	call	port_byte_out
+	addl	$16, %esp
+	.loc 1 49 0
+	subl	$8, %esp
+	pushl	$17
+	pushl	$160
+	call	port_byte_out
+	addl	$16, %esp
+	.loc 1 50 0
+	subl	$8, %esp
+	pushl	$32
+	pushl	$33
+	call	port_byte_out
+	addl	$16, %esp
+	.loc 1 51 0
+	subl	$8, %esp
+	pushl	$40
+	pushl	$161
+	call	port_byte_out
+	addl	$16, %esp
+	.loc 1 52 0
+	subl	$8, %esp
+	pushl	$4
+	pushl	$33
+	call	port_byte_out
+	addl	$16, %esp
+	.loc 1 53 0
+	subl	$8, %esp
+	pushl	$2
+	pushl	$161
+	call	port_byte_out
+	addl	$16, %esp
+	.loc 1 54 0
+	subl	$8, %esp
+	pushl	$1
+	pushl	$33
+	call	port_byte_out
+	addl	$16, %esp
+	.loc 1 55 0
+	subl	$8, %esp
+	pushl	$1
+	pushl	$161
+	call	port_byte_out
+	addl	$16, %esp
+	.loc 1 56 0
+	subl	$8, %esp
+	pushl	$0
+	pushl	$33
+	call	port_byte_out
+	addl	$16, %esp
+	.loc 1 57 0
+	subl	$8, %esp
+	pushl	$0
+	pushl	$161
+	call	port_byte_out
+	addl	$16, %esp
+	.loc 1 60 0
+	movl	$irq0, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$32
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 61 0
+	movl	$irq1, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$33
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 62 0
+	movl	$irq2, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$34
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 63 0
+	movl	$irq3, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$35
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 64 0
+	movl	$irq4, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$36
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 65 0
+	movl	$irq5, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$37
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 66 0
+	movl	$irq6, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$38
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 67 0
+	movl	$irq7, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$39
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 68 0
+	movl	$irq8, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$40
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 69 0
+	movl	$irq9, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$41
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 70 0
+	movl	$irq10, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$42
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 71 0
+	movl	$irq11, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$43
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 72 0
+	movl	$irq12, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$44
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 73 0
+	movl	$irq13, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$45
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 74 0
+	movl	$irq14, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$46
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 75 0
+	movl	$irq15, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$47
+	call	set_idt_gate
+	addl	$16, %esp
+	.loc 1 77 0
+	call	set_idt
+	.loc 1 78 0
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE0:
+	.size	isr_install, .-isr_install
+	.globl	exception_messages
+	.section	.rodata
+.LC0:
+	.string	"Division By Zero"
+.LC1:
+	.string	"Debug"
+.LC2:
+	.string	"Non Maskable Interrupt"
+.LC3:
+	.string	"Breakpoint"
+.LC4:
+	.string	"Into Detected Overflow"
+.LC5:
+	.string	"Out of Bounds"
+.LC6:
+	.string	"Invalid Opcode"
+.LC7:
+	.string	"No Coprocessor"
+.LC8:
+	.string	"Double Fault"
+.LC9:
+	.string	"Coprocessor Segment Overrun"
+.LC10:
+	.string	"Bad TSS"
+.LC11:
+	.string	"Segment Not Present"
+.LC12:
+	.string	"Stack Fault"
+.LC13:
+	.string	"General Protection Fault"
+.LC14:
+	.string	"Page Fault"
+.LC15:
+	.string	"Unknown Interrupt"
+.LC16:
+	.string	"Coprocessor Fault"
+.LC17:
+	.string	"Alignment Check"
+.LC18:
+	.string	"Machine Check"
+.LC19:
+	.string	"Reserved"
+	.data
+	.align 32
+	.type	exception_messages, @object
+	.size	exception_messages, 128
+exception_messages:
+	.long	.LC0
+	.long	.LC1
+	.long	.LC2
+	.long	.LC3
+	.long	.LC4
+	.long	.LC5
+	.long	.LC6
+	.long	.LC7
+	.long	.LC8
+	.long	.LC9
+	.long	.LC10
+	.long	.LC11
+	.long	.LC12
+	.long	.LC13
+	.long	.LC14
+	.long	.LC15
+	.long	.LC16
+	.long	.LC17
+	.long	.LC18
+	.long	.LC19
+	.long	.LC19
+	.long	.LC19
+	.long	.LC19
+	.long	.LC19
+	.long	.LC19
+	.long	.LC19
+	.long	.LC19
+	.long	.LC19
+	.long	.LC19
+	.long	.LC19
+	.long	.LC19
+	.long	.LC19
+	.section	.rodata
+.LC20:
+	.string	"received interrupt: "
+.LC21:
+	.string	"\n"
+	.text
+	.globl	isr_handler
+	.type	isr_handler, @function
+isr_handler:
+.LFB1:
+	.loc 1 119 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$24, %esp
+	.loc 1 120 0
+	subl	$12, %esp
+	pushl	$.LC20
+	call	kprint
+	addl	$16, %esp
+	.loc 1 122 0
+	movl	44(%ebp), %eax
+	movl	%eax, %edx
+	subl	$8, %esp
+	leal	-11(%ebp), %eax
+	pushl	%eax
+	pushl	%edx
+	call	int_to_ascii
+	addl	$16, %esp
+	.loc 1 123 0
+	subl	$12, %esp
+	leal	-11(%ebp), %eax
+	pushl	%eax
+	call	kprint
+	addl	$16, %esp
+	.loc 1 124 0
+	subl	$12, %esp
+	pushl	$.LC21
+	call	kprint
+	addl	$16, %esp
+	.loc 1 125 0
+	movl	44(%ebp), %eax
+	movl	exception_messages(,%eax,4), %eax
+	subl	$12, %esp
+	pushl	%eax
+	call	kprint
+	addl	$16, %esp
+	.loc 1 126 0
+	subl	$12, %esp
+	pushl	$.LC21
+	call	kprint
+	addl	$16, %esp
+	.loc 1 127 0
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE1:
+	.size	isr_handler, .-isr_handler
+	.globl	register_interrupt_handler
+	.type	register_interrupt_handler, @function
+register_interrupt_handler:
+.LFB2:
+	.loc 1 129 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$4, %esp
+	movl	8(%ebp), %eax
+	movb	%al, -4(%ebp)
+	.loc 1 130 0
+	movzbl	-4(%ebp), %eax
+	movl	12(%ebp), %edx
+	movl	%edx, interrupt_handlers(,%eax,4)
+	.loc 1 131 0
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE2:
+	.size	register_interrupt_handler, .-register_interrupt_handler
+	.globl	irq_handler
+	.type	irq_handler, @function
+irq_handler:
+.LFB3:
+	.loc 1 133 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$24, %esp
+	.loc 1 136 0
+	movl	44(%ebp), %eax
+	cmpl	$39, %eax
+	jbe	.L5
+	.loc 1 136 0 is_stmt 0 discriminator 1
+	subl	$8, %esp
+	pushl	$32
+	pushl	$160
+	call	port_byte_out
+	addl	$16, %esp
+.L5:
+	.loc 1 137 0 is_stmt 1
+	subl	$8, %esp
+	pushl	$32
+	pushl	$32
+	call	port_byte_out
+	addl	$16, %esp
+	.loc 1 140 0
+	movl	44(%ebp), %eax
+	movl	interrupt_handlers(,%eax,4), %eax
+	testl	%eax, %eax
+	je	.L7
+.LBB2:
+	.loc 1 141 0
+	movl	44(%ebp), %eax
+	movl	interrupt_handlers(,%eax,4), %eax
+	movl	%eax, -12(%ebp)
+	.loc 1 142 0
+	pushl	68(%ebp)
+	pushl	64(%ebp)
+	pushl	60(%ebp)
+	pushl	56(%ebp)
+	pushl	52(%ebp)
+	pushl	48(%ebp)
+	pushl	44(%ebp)
+	pushl	40(%ebp)
+	pushl	36(%ebp)
+	pushl	32(%ebp)
+	pushl	28(%ebp)
+	pushl	24(%ebp)
+	pushl	20(%ebp)
+	pushl	16(%ebp)
+	pushl	12(%ebp)
+	pushl	8(%ebp)
+	movl	-12(%ebp), %eax
+	call	*%eax
+	addl	$64, %esp
+.L7:
+.LBE2:
+	.loc 1 144 0
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE3:
+	.size	irq_handler, .-irq_handler
+	.globl	irq_install
+	.type	irq_install, @function
+irq_install:
+.LFB4:
+	.loc 1 146 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$8, %esp
+	.loc 1 148 0
+#APP
+# 148 "./cpu/isr.c" 1
+	sti
+# 0 "" 2
+	.loc 1 150 0
+#NO_APP
+	subl	$12, %esp
+	pushl	$50
+	call	init_timer
+	addl	$16, %esp
+	.loc 1 152 0
+	call	init_keyboard
+	.loc 1 153 0
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE4:
+	.size	irq_install, .-irq_install
+.Letext0:
+	.file 2 "./cpu/types.h"
+	.file 3 "./cpu/isr.h"
+	.file 4 "./cpu/idt.h"
+	.section	.debug_info,"",@progbits
+.Ldebug_info0:
+	.long	0x320
+	.value	0x4
+	.long	.Ldebug_abbrev0
+	.byte	0x4
+	.uleb128 0x1
+	.long	.LASF29
+	.byte	0xc
+	.long	.LASF30
+	.long	.LASF31
+	.long	.Ltext0
+	.long	.Letext0-.Ltext0
+	.long	.Ldebug_line0
+	.uleb128 0x2
+	.string	"u32"
+	.byte	0x2
+	.byte	0x6
+	.long	0x30
+	.uleb128 0x3
+	.byte	0x4
+	.byte	0x7
+	.long	.LASF0
+	.uleb128 0x4
+	.byte	0x4
+	.byte	0x5
+	.string	"int"
+	.uleb128 0x2
+	.string	"u16"
+	.byte	0x2
+	.byte	0x8
+	.long	0x49
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x7
+	.long	.LASF1
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x5
+	.long	.LASF2
+	.uleb128 0x2
+	.string	"u8"
+	.byte	0x2
+	.byte	0xa
+	.long	0x61
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x8
+	.long	.LASF3
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x6
+	.long	.LASF4
+	.uleb128 0x5
+	.byte	0x40
+	.byte	0x3
+	.byte	0x4b
+	.long	0x135
+	.uleb128 0x6
+	.string	"ds"
+	.byte	0x3
+	.byte	0x4c
+	.long	0x25
+	.byte	0
+	.uleb128 0x6
+	.string	"edi"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0x4
+	.uleb128 0x6
+	.string	"esi"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0x8
+	.uleb128 0x6
+	.string	"ebp"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0xc
+	.uleb128 0x6
+	.string	"esp"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0x10
+	.uleb128 0x6
+	.string	"ebx"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0x14
+	.uleb128 0x6
+	.string	"edx"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0x18
+	.uleb128 0x6
+	.string	"ecx"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0x1c
+	.uleb128 0x6
+	.string	"eax"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0x20
+	.uleb128 0x7
+	.long	.LASF5
+	.byte	0x3
+	.byte	0x4e
+	.long	0x25
+	.byte	0x24
+	.uleb128 0x7
+	.long	.LASF6
+	.byte	0x3
+	.byte	0x4e
+	.long	0x25
+	.byte	0x28
+	.uleb128 0x6
+	.string	"eip"
+	.byte	0x3
+	.byte	0x4f
+	.long	0x25
+	.byte	0x2c
+	.uleb128 0x6
+	.string	"cs"
+	.byte	0x3
+	.byte	0x4f
+	.long	0x25
+	.byte	0x30
+	.uleb128 0x7
+	.long	.LASF7
+	.byte	0x3
+	.byte	0x4f
+	.long	0x25
+	.byte	0x34
+	.uleb128 0x7
+	.long	.LASF8
+	.byte	0x3
+	.byte	0x4f
+	.long	0x25
+	.byte	0x38
+	.uleb128 0x6
+	.string	"ss"
+	.byte	0x3
+	.byte	0x4f
+	.long	0x25
+	.byte	0x3c
+	.byte	0
+	.uleb128 0x8
+	.long	.LASF9
+	.byte	0x3
+	.byte	0x50
+	.long	0x6f
+	.uleb128 0x8
+	.long	.LASF10
+	.byte	0x3
+	.byte	0x56
+	.long	0x14b
+	.uleb128 0x9
+	.byte	0x4
+	.long	0x151
+	.uleb128 0xa
+	.long	0x15c
+	.uleb128 0xb
+	.long	0x135
+	.byte	0
+	.uleb128 0x5
+	.byte	0x8
+	.byte	0x4
+	.byte	0xa
+	.long	0x1a1
+	.uleb128 0x7
+	.long	.LASF11
+	.byte	0x4
+	.byte	0xb
+	.long	0x3e
+	.byte	0
+	.uleb128 0x6
+	.string	"sel"
+	.byte	0x4
+	.byte	0xc
+	.long	0x3e
+	.byte	0x2
+	.uleb128 0x7
+	.long	.LASF12
+	.byte	0x4
+	.byte	0xd
+	.long	0x57
+	.byte	0x4
+	.uleb128 0x7
+	.long	.LASF13
+	.byte	0x4
+	.byte	0x13
+	.long	0x57
+	.byte	0x5
+	.uleb128 0x7
+	.long	.LASF14
+	.byte	0x4
+	.byte	0x14
+	.long	0x3e
+	.byte	0x6
+	.byte	0
+	.uleb128 0x8
+	.long	.LASF15
+	.byte	0x4
+	.byte	0x15
+	.long	0x15c
+	.uleb128 0x5
+	.byte	0x6
+	.byte	0x4
+	.byte	0x19
+	.long	0x1cd
+	.uleb128 0x7
+	.long	.LASF16
+	.byte	0x4
+	.byte	0x1a
+	.long	0x3e
+	.byte	0
+	.uleb128 0x7
+	.long	.LASF17
+	.byte	0x4
+	.byte	0x1b
+	.long	0x25
+	.byte	0x2
+	.byte	0
+	.uleb128 0x8
+	.long	.LASF18
+	.byte	0x4
+	.byte	0x1c
+	.long	0x1ac
+	.uleb128 0xc
+	.long	.LASF24
+	.byte	0x1
+	.byte	0xd
+	.long	.LFB0
+	.long	.LFE0-.LFB0
+	.uleb128 0x1
+	.byte	0x9c
+	.uleb128 0xd
+	.long	.LASF20
+	.byte	0x1
+	.byte	0x77
+	.long	.LFB1
+	.long	.LFE1-.LFB1
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x217
+	.uleb128 0xe
+	.string	"r"
+	.byte	0x1
+	.byte	0x77
+	.long	0x135
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.uleb128 0xf
+	.string	"s"
+	.byte	0x1
+	.byte	0x79
+	.long	0x217
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -19
+	.byte	0
+	.uleb128 0x10
+	.long	0x68
+	.long	0x227
+	.uleb128 0x11
+	.long	0x227
+	.byte	0x2
+	.byte	0
+	.uleb128 0x3
+	.byte	0x4
+	.byte	0x7
+	.long	.LASF19
+	.uleb128 0x12
+	.long	.LASF21
+	.byte	0x1
+	.byte	0x81
+	.long	.LFB2
+	.long	.LFE2-.LFB2
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x25e
+	.uleb128 0xe
+	.string	"n"
+	.byte	0x1
+	.byte	0x81
+	.long	0x57
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -12
+	.uleb128 0x13
+	.long	.LASF22
+	.byte	0x1
+	.byte	0x81
+	.long	0x140
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 4
+	.byte	0
+	.uleb128 0xd
+	.long	.LASF23
+	.byte	0x1
+	.byte	0x85
+	.long	.LFB3
+	.long	.LFE3-.LFB3
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x298
+	.uleb128 0xe
+	.string	"r"
+	.byte	0x1
+	.byte	0x85
+	.long	0x135
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.uleb128 0x14
+	.long	.LBB2
+	.long	.LBE2-.LBB2
+	.uleb128 0x15
+	.long	.LASF22
+	.byte	0x1
+	.byte	0x8d
+	.long	0x140
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -20
+	.byte	0
+	.byte	0
+	.uleb128 0xc
+	.long	.LASF25
+	.byte	0x1
+	.byte	0x92
+	.long	.LFB4
+	.long	.LFE4-.LFB4
+	.uleb128 0x1
+	.byte	0x9c
+	.uleb128 0x10
+	.long	0x1a1
+	.long	0x2b9
+	.uleb128 0x11
+	.long	0x227
+	.byte	0xff
+	.byte	0
+	.uleb128 0x16
+	.string	"idt"
+	.byte	0x4
+	.byte	0x1f
+	.long	0x2a9
+	.uleb128 0x5
+	.byte	0x3
+	.long	idt
+	.uleb128 0x17
+	.long	.LASF26
+	.byte	0x4
+	.byte	0x20
+	.long	0x1cd
+	.uleb128 0x5
+	.byte	0x3
+	.long	idt_reg
+	.uleb128 0x10
+	.long	0x140
+	.long	0x2eb
+	.uleb128 0x11
+	.long	0x227
+	.byte	0xff
+	.byte	0
+	.uleb128 0x17
+	.long	.LASF27
+	.byte	0x1
+	.byte	0x9
+	.long	0x2db
+	.uleb128 0x5
+	.byte	0x3
+	.long	interrupt_handlers
+	.uleb128 0x10
+	.long	0x30c
+	.long	0x30c
+	.uleb128 0x11
+	.long	0x227
+	.byte	0x1f
+	.byte	0
+	.uleb128 0x9
+	.byte	0x4
+	.long	0x68
+	.uleb128 0x17
+	.long	.LASF28
+	.byte	0x1
+	.byte	0x51
+	.long	0x2fc
+	.uleb128 0x5
+	.byte	0x3
+	.long	exception_messages
+	.byte	0
+	.section	.debug_abbrev,"",@progbits
+.Ldebug_abbrev0:
+	.uleb128 0x1
+	.uleb128 0x11
+	.byte	0x1
+	.uleb128 0x25
+	.uleb128 0xe
+	.uleb128 0x13
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x1b
+	.uleb128 0xe
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x10
+	.uleb128 0x17
+	.byte	0
+	.byte	0
+	.uleb128 0x2
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.byte	0
+	.byte	0
+	.uleb128 0x4
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0x8
+	.byte	0
+	.byte	0
+	.uleb128 0x5
+	.uleb128 0x13
+	.byte	0x1
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x6
+	.uleb128 0xd
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x38
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0x7
+	.uleb128 0xd
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x38
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0x8
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x9
+	.uleb128 0xf
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xa
+	.uleb128 0x15
+	.byte	0x1
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0x5
+	.byte	0
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xc
+	.uleb128 0x2e
+	.byte	0
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2116
+	.uleb128 0x19
+	.byte	0
+	.byte	0
+	.uleb128 0xd
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2116
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xe
+	.uleb128 0x5
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0xf
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x10
+	.uleb128 0x1
+	.byte	0x1
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x11
+	.uleb128 0x21
+	.byte	0
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2f
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0x12
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2117
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x13
+	.uleb128 0x5
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x14
+	.uleb128 0xb
+	.byte	0x1
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.byte	0
+	.byte	0
+	.uleb128 0x15
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x16
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x17
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.byte	0
+	.section	.debug_aranges,"",@progbits
+	.long	0x1c
+	.value	0x2
+	.long	.Ldebug_info0
+	.byte	0x4
+	.byte	0
+	.value	0
+	.value	0
+	.long	.Ltext0
+	.long	.Letext0-.Ltext0
+	.long	0
+	.long	0
+	.section	.debug_line,"",@progbits
+.Ldebug_line0:
+	.section	.debug_str,"MS",@progbits,1
+.LASF15:
+	.string	"idt_gate_t"
+.LASF25:
+	.string	"irq_install"
+.LASF27:
+	.string	"interrupt_handlers"
+.LASF21:
+	.string	"register_interrupt_handler"
+.LASF5:
+	.string	"int_no"
+.LASF23:
+	.string	"irq_handler"
+.LASF8:
+	.string	"useresp"
+.LASF26:
+	.string	"idt_reg"
+.LASF12:
+	.string	"always0"
+.LASF3:
+	.string	"unsigned char"
+.LASF24:
+	.string	"isr_install"
+.LASF22:
+	.string	"handler"
+.LASF17:
+	.string	"base"
+.LASF1:
+	.string	"short unsigned int"
+.LASF30:
+	.string	"./cpu/isr.c"
+.LASF20:
+	.string	"isr_handler"
+.LASF0:
+	.string	"unsigned int"
+.LASF13:
+	.string	"flags"
+.LASF4:
+	.string	"char"
+.LASF29:
+	.string	"GNU C11 5.4.0 20160609 -m32 -mtune=generic -march=i686 -g -fno-pie -ffreestanding -fno-builtin -fno-stack-protector"
+.LASF16:
+	.string	"limit"
+.LASF9:
+	.string	"registers_t"
+.LASF19:
+	.string	"sizetype"
+.LASF7:
+	.string	"eflags"
+.LASF31:
+	.string	"/home/os/OS_Project/Part4/10_scheduler"
+.LASF6:
+	.string	"err_code"
+.LASF28:
+	.string	"exception_messages"
+.LASF2:
+	.string	"short int"
+.LASF10:
+	.string	"isr_t"
+.LASF14:
+	.string	"high_offset"
+.LASF18:
+	.string	"idt_register_t"
+.LASF11:
+	.string	"low_offset"
+	.ident	"GCC: (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609"
+	.section	.note.GNU-stack,"",@progbits
diff --git a/Part4/10_scheduler/keyboard.s b/Part4/10_scheduler/keyboard.s
new file mode 100644
index 0000000..bb05bb6
--- /dev/null
+++ b/Part4/10_scheduler/keyboard.s
@@ -0,0 +1,965 @@
+	.file	"keyboard.c"
+	.text
+.Ltext0:
+	.local	key_buffer
+	.comm	key_buffer,256,32
+	.globl	sc_name
+	.section	.rodata
+.LC0:
+	.string	"ERROR"
+.LC1:
+	.string	"Esc"
+.LC2:
+	.string	"1"
+.LC3:
+	.string	"2"
+.LC4:
+	.string	"3"
+.LC5:
+	.string	"4"
+.LC6:
+	.string	"5"
+.LC7:
+	.string	"6"
+.LC8:
+	.string	"7"
+.LC9:
+	.string	"8"
+.LC10:
+	.string	"9"
+.LC11:
+	.string	"0"
+.LC12:
+	.string	"-"
+.LC13:
+	.string	"="
+.LC14:
+	.string	"Backspace"
+.LC15:
+	.string	"Tab"
+.LC16:
+	.string	"Q"
+.LC17:
+	.string	"W"
+.LC18:
+	.string	"E"
+.LC19:
+	.string	"R"
+.LC20:
+	.string	"T"
+.LC21:
+	.string	"Y"
+.LC22:
+	.string	"U"
+.LC23:
+	.string	"I"
+.LC24:
+	.string	"O"
+.LC25:
+	.string	"P"
+.LC26:
+	.string	"["
+.LC27:
+	.string	"]"
+.LC28:
+	.string	"Enter"
+.LC29:
+	.string	"Lctrl"
+.LC30:
+	.string	"A"
+.LC31:
+	.string	"S"
+.LC32:
+	.string	"D"
+.LC33:
+	.string	"F"
+.LC34:
+	.string	"G"
+.LC35:
+	.string	"H"
+.LC36:
+	.string	"J"
+.LC37:
+	.string	"K"
+.LC38:
+	.string	"L"
+.LC39:
+	.string	";"
+.LC40:
+	.string	"'"
+.LC41:
+	.string	"`"
+.LC42:
+	.string	"LShift"
+.LC43:
+	.string	"\\"
+.LC44:
+	.string	"Z"
+.LC45:
+	.string	"X"
+.LC46:
+	.string	"C"
+.LC47:
+	.string	"V"
+.LC48:
+	.string	"B"
+.LC49:
+	.string	"N"
+.LC50:
+	.string	"M"
+.LC51:
+	.string	","
+.LC52:
+	.string	"."
+.LC53:
+	.string	"/"
+.LC54:
+	.string	"RShift"
+.LC55:
+	.string	"Keypad *"
+.LC56:
+	.string	"LAlt"
+.LC57:
+	.string	"Spacebar"
+	.data
+	.align 32
+	.type	sc_name, @object
+	.size	sc_name, 232
+sc_name:
+	.long	.LC0
+	.long	.LC1
+	.long	.LC2
+	.long	.LC3
+	.long	.LC4
+	.long	.LC5
+	.long	.LC6
+	.long	.LC7
+	.long	.LC8
+	.long	.LC9
+	.long	.LC10
+	.long	.LC11
+	.long	.LC12
+	.long	.LC13
+	.long	.LC14
+	.long	.LC15
+	.long	.LC16
+	.long	.LC17
+	.long	.LC18
+	.long	.LC19
+	.long	.LC20
+	.long	.LC21
+	.long	.LC22
+	.long	.LC23
+	.long	.LC24
+	.long	.LC25
+	.long	.LC26
+	.long	.LC27
+	.long	.LC28
+	.long	.LC29
+	.long	.LC30
+	.long	.LC31
+	.long	.LC32
+	.long	.LC33
+	.long	.LC34
+	.long	.LC35
+	.long	.LC36
+	.long	.LC37
+	.long	.LC38
+	.long	.LC39
+	.long	.LC40
+	.long	.LC41
+	.long	.LC42
+	.long	.LC43
+	.long	.LC44
+	.long	.LC45
+	.long	.LC46
+	.long	.LC47
+	.long	.LC48
+	.long	.LC49
+	.long	.LC50
+	.long	.LC51
+	.long	.LC52
+	.long	.LC53
+	.long	.LC54
+	.long	.LC55
+	.long	.LC56
+	.long	.LC57
+	.globl	sc_ascii
+	.section	.rodata
+	.align 32
+	.type	sc_ascii, @object
+	.size	sc_ascii, 58
+sc_ascii:
+	.byte	63
+	.byte	63
+	.byte	49
+	.byte	50
+	.byte	51
+	.byte	52
+	.byte	53
+	.byte	54
+	.byte	55
+	.byte	56
+	.byte	57
+	.byte	48
+	.byte	45
+	.byte	61
+	.byte	63
+	.byte	63
+	.byte	81
+	.byte	87
+	.byte	69
+	.byte	82
+	.byte	84
+	.byte	89
+	.byte	85
+	.byte	73
+	.byte	79
+	.byte	80
+	.byte	91
+	.byte	93
+	.byte	63
+	.byte	63
+	.byte	65
+	.byte	83
+	.byte	68
+	.byte	70
+	.byte	71
+	.byte	72
+	.byte	74
+	.byte	75
+	.byte	76
+	.byte	59
+	.byte	39
+	.byte	96
+	.byte	63
+	.byte	92
+	.byte	90
+	.byte	88
+	.byte	67
+	.byte	86
+	.byte	66
+	.byte	78
+	.byte	77
+	.byte	44
+	.byte	46
+	.byte	47
+	.byte	63
+	.byte	63
+	.byte	63
+	.byte	32
+.LC58:
+	.string	"\n"
+	.text
+	.type	keyboard_callback, @function
+keyboard_callback:
+.LFB0:
+	.file 1 "./drivers/keyboard.c"
+	.loc 1 27 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$24, %esp
+	.loc 1 29 0
+	subl	$12, %esp
+	pushl	$96
+	call	port_byte_in
+	addl	$16, %esp
+	movb	%al, -9(%ebp)
+	.loc 1 31 0
+	cmpb	$57, -9(%ebp)
+	ja	.L6
+	.loc 1 32 0
+	cmpb	$14, -9(%ebp)
+	jne	.L4
+	.loc 1 33 0
+	subl	$12, %esp
+	pushl	$key_buffer
+	call	backspace
+	addl	$16, %esp
+	.loc 1 34 0
+	call	kprint_backspace
+	jmp	.L1
+.L4:
+	.loc 1 35 0
+	cmpb	$28, -9(%ebp)
+	jne	.L5
+	.loc 1 36 0
+	subl	$12, %esp
+	pushl	$.LC58
+	call	kprint
+	addl	$16, %esp
+	.loc 1 37 0
+	subl	$12, %esp
+	pushl	$key_buffer
+	call	user_input
+	addl	$16, %esp
+	.loc 1 38 0
+	movb	$0, key_buffer
+	jmp	.L1
+.L5:
+.LBB2:
+	.loc 1 40 0 discriminator 2
+	movzbl	-9(%ebp), %eax
+	movzbl	sc_ascii(%eax), %eax
+	movb	%al, -10(%ebp)
+	.loc 1 42 0 discriminator 2
+	movzbl	-10(%ebp), %eax
+	movb	%al, -12(%ebp)
+	movb	$0, -11(%ebp)
+	.loc 1 43 0 discriminator 2
+	movsbl	-10(%ebp), %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$key_buffer
+	call	append
+	addl	$16, %esp
+	.loc 1 44 0 discriminator 2
+	subl	$12, %esp
+	leal	-12(%ebp), %eax
+	pushl	%eax
+	call	kprint
+	addl	$16, %esp
+	jmp	.L1
+.L6:
+.LBE2:
+	.loc 1 31 0
+	nop
+.L1:
+	.loc 1 47 0
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE0:
+	.size	keyboard_callback, .-keyboard_callback
+	.globl	init_keyboard
+	.type	init_keyboard, @function
+init_keyboard:
+.LFB1:
+	.loc 1 49 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$8, %esp
+	.loc 1 50 0
+	subl	$8, %esp
+	pushl	$keyboard_callback
+	pushl	$33
+	call	register_interrupt_handler
+	addl	$16, %esp
+	.loc 1 51 0
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE1:
+	.size	init_keyboard, .-init_keyboard
+.Letext0:
+	.file 2 "./drivers/../cpu/types.h"
+	.file 3 "./drivers/../cpu/isr.h"
+	.section	.debug_info,"",@progbits
+.Ldebug_info0:
+	.long	0x225
+	.value	0x4
+	.long	.Ldebug_abbrev0
+	.byte	0x4
+	.uleb128 0x1
+	.long	.LASF16
+	.byte	0xc
+	.long	.LASF17
+	.long	.LASF18
+	.long	.Ltext0
+	.long	.Letext0-.Ltext0
+	.long	.Ldebug_line0
+	.uleb128 0x2
+	.string	"u32"
+	.byte	0x2
+	.byte	0x6
+	.long	0x30
+	.uleb128 0x3
+	.byte	0x4
+	.byte	0x7
+	.long	.LASF0
+	.uleb128 0x4
+	.byte	0x4
+	.byte	0x5
+	.string	"int"
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x7
+	.long	.LASF1
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x5
+	.long	.LASF2
+	.uleb128 0x2
+	.string	"u8"
+	.byte	0x2
+	.byte	0xa
+	.long	0x56
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x8
+	.long	.LASF3
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x6
+	.long	.LASF4
+	.uleb128 0x5
+	.byte	0x40
+	.byte	0x3
+	.byte	0x4b
+	.long	0x12a
+	.uleb128 0x6
+	.string	"ds"
+	.byte	0x3
+	.byte	0x4c
+	.long	0x25
+	.byte	0
+	.uleb128 0x6
+	.string	"edi"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0x4
+	.uleb128 0x6
+	.string	"esi"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0x8
+	.uleb128 0x6
+	.string	"ebp"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0xc
+	.uleb128 0x6
+	.string	"esp"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0x10
+	.uleb128 0x6
+	.string	"ebx"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0x14
+	.uleb128 0x6
+	.string	"edx"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0x18
+	.uleb128 0x6
+	.string	"ecx"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0x1c
+	.uleb128 0x6
+	.string	"eax"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0x20
+	.uleb128 0x7
+	.long	.LASF5
+	.byte	0x3
+	.byte	0x4e
+	.long	0x25
+	.byte	0x24
+	.uleb128 0x7
+	.long	.LASF6
+	.byte	0x3
+	.byte	0x4e
+	.long	0x25
+	.byte	0x28
+	.uleb128 0x6
+	.string	"eip"
+	.byte	0x3
+	.byte	0x4f
+	.long	0x25
+	.byte	0x2c
+	.uleb128 0x6
+	.string	"cs"
+	.byte	0x3
+	.byte	0x4f
+	.long	0x25
+	.byte	0x30
+	.uleb128 0x7
+	.long	.LASF7
+	.byte	0x3
+	.byte	0x4f
+	.long	0x25
+	.byte	0x34
+	.uleb128 0x7
+	.long	.LASF8
+	.byte	0x3
+	.byte	0x4f
+	.long	0x25
+	.byte	0x38
+	.uleb128 0x6
+	.string	"ss"
+	.byte	0x3
+	.byte	0x4f
+	.long	0x25
+	.byte	0x3c
+	.byte	0
+	.uleb128 0x8
+	.long	.LASF9
+	.byte	0x3
+	.byte	0x50
+	.long	0x64
+	.uleb128 0x9
+	.long	.LASF19
+	.byte	0x1
+	.byte	0x1b
+	.long	.LFB0
+	.long	.LFE0-.LFB0
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x18d
+	.uleb128 0xa
+	.long	.LASF20
+	.byte	0x1
+	.byte	0x1b
+	.long	0x12a
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.uleb128 0xb
+	.long	.LASF10
+	.byte	0x1
+	.byte	0x1d
+	.long	0x4c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -17
+	.uleb128 0xc
+	.long	.LBB2
+	.long	.LBE2-.LBB2
+	.uleb128 0xb
+	.long	.LASF11
+	.byte	0x1
+	.byte	0x28
+	.long	0x5d
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -18
+	.uleb128 0xd
+	.string	"str"
+	.byte	0x1
+	.byte	0x2a
+	.long	0x18d
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -20
+	.byte	0
+	.byte	0
+	.uleb128 0xe
+	.long	0x5d
+	.long	0x19d
+	.uleb128 0xf
+	.long	0x19d
+	.byte	0x1
+	.byte	0
+	.uleb128 0x3
+	.byte	0x4
+	.byte	0x7
+	.long	.LASF12
+	.uleb128 0x10
+	.long	.LASF21
+	.byte	0x1
+	.byte	0x31
+	.long	.LFB1
+	.long	.LFE1-.LFB1
+	.uleb128 0x1
+	.byte	0x9c
+	.uleb128 0xe
+	.long	0x5d
+	.long	0x1c5
+	.uleb128 0xf
+	.long	0x19d
+	.byte	0xff
+	.byte	0
+	.uleb128 0xb
+	.long	.LASF13
+	.byte	0x1
+	.byte	0xc
+	.long	0x1b5
+	.uleb128 0x5
+	.byte	0x3
+	.long	key_buffer
+	.uleb128 0xe
+	.long	0x1e6
+	.long	0x1e6
+	.uleb128 0xf
+	.long	0x19d
+	.byte	0x39
+	.byte	0
+	.uleb128 0x11
+	.byte	0x4
+	.long	0x1ec
+	.uleb128 0x12
+	.long	0x5d
+	.uleb128 0x13
+	.long	.LASF14
+	.byte	0x1
+	.byte	0xf
+	.long	0x1d6
+	.uleb128 0x5
+	.byte	0x3
+	.long	sc_name
+	.uleb128 0xe
+	.long	0x1ec
+	.long	0x212
+	.uleb128 0xf
+	.long	0x19d
+	.byte	0x39
+	.byte	0
+	.uleb128 0x13
+	.long	.LASF15
+	.byte	0x1
+	.byte	0x15
+	.long	0x223
+	.uleb128 0x5
+	.byte	0x3
+	.long	sc_ascii
+	.uleb128 0x12
+	.long	0x202
+	.byte	0
+	.section	.debug_abbrev,"",@progbits
+.Ldebug_abbrev0:
+	.uleb128 0x1
+	.uleb128 0x11
+	.byte	0x1
+	.uleb128 0x25
+	.uleb128 0xe
+	.uleb128 0x13
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x1b
+	.uleb128 0xe
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x10
+	.uleb128 0x17
+	.byte	0
+	.byte	0
+	.uleb128 0x2
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.byte	0
+	.byte	0
+	.uleb128 0x4
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0x8
+	.byte	0
+	.byte	0
+	.uleb128 0x5
+	.uleb128 0x13
+	.byte	0x1
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x6
+	.uleb128 0xd
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x38
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0x7
+	.uleb128 0xd
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x38
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0x8
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x9
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2116
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xa
+	.uleb128 0x5
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0xc
+	.uleb128 0xb
+	.byte	0x1
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.byte	0
+	.byte	0
+	.uleb128 0xd
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0xe
+	.uleb128 0x1
+	.byte	0x1
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xf
+	.uleb128 0x21
+	.byte	0
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2f
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0x10
+	.uleb128 0x2e
+	.byte	0
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2116
+	.uleb128 0x19
+	.byte	0
+	.byte	0
+	.uleb128 0x11
+	.uleb128 0xf
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x12
+	.uleb128 0x26
+	.byte	0
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x13
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.byte	0
+	.section	.debug_aranges,"",@progbits
+	.long	0x1c
+	.value	0x2
+	.long	.Ldebug_info0
+	.byte	0x4
+	.byte	0
+	.value	0
+	.value	0
+	.long	.Ltext0
+	.long	.Letext0-.Ltext0
+	.long	0
+	.long	0
+	.section	.debug_line,"",@progbits
+.Ldebug_line0:
+	.section	.debug_str,"MS",@progbits,1
+.LASF13:
+	.string	"key_buffer"
+.LASF10:
+	.string	"scancode"
+.LASF14:
+	.string	"sc_name"
+.LASF15:
+	.string	"sc_ascii"
+.LASF5:
+	.string	"int_no"
+.LASF8:
+	.string	"useresp"
+.LASF3:
+	.string	"unsigned char"
+.LASF1:
+	.string	"short unsigned int"
+.LASF17:
+	.string	"./drivers/keyboard.c"
+.LASF0:
+	.string	"unsigned int"
+.LASF4:
+	.string	"char"
+.LASF20:
+	.string	"regs"
+.LASF16:
+	.string	"GNU C11 5.4.0 20160609 -m32 -mtune=generic -march=i686 -g -fno-pie -ffreestanding -fno-builtin -fno-stack-protector"
+.LASF21:
+	.string	"init_keyboard"
+.LASF9:
+	.string	"registers_t"
+.LASF19:
+	.string	"keyboard_callback"
+.LASF7:
+	.string	"eflags"
+.LASF12:
+	.string	"sizetype"
+.LASF18:
+	.string	"/home/os/OS_Project/Part4/10_scheduler"
+.LASF6:
+	.string	"err_code"
+.LASF2:
+	.string	"short int"
+.LASF11:
+	.string	"letter"
+	.ident	"GCC: (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609"
+	.section	.note.GNU-stack,"",@progbits
diff --git a/Part4/10_scheduler/mem.s b/Part4/10_scheduler/mem.s
new file mode 100644
index 0000000..4268e60
--- /dev/null
+++ b/Part4/10_scheduler/mem.s
@@ -0,0 +1,673 @@
+	.file	"mem.c"
+	.text
+.Ltext0:
+	.globl	memory_copy
+	.type	memory_copy, @function
+memory_copy:
+.LFB0:
+	.file 1 "./libc/mem.c"
+	.loc 1 3 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$16, %esp
+	.loc 1 5 0
+	movl	$0, -4(%ebp)
+	jmp	.L2
+.L3:
+	.loc 1 6 0 discriminator 3
+	movl	-4(%ebp), %edx
+	movl	12(%ebp), %eax
+	addl	%eax, %edx
+	movl	-4(%ebp), %ecx
+	movl	8(%ebp), %eax
+	addl	%ecx, %eax
+	movzbl	(%eax), %eax
+	movb	%al, (%edx)
+	.loc 1 5 0 discriminator 3
+	addl	$1, -4(%ebp)
+.L2:
+	.loc 1 5 0 is_stmt 0 discriminator 1
+	movl	-4(%ebp), %eax
+	cmpl	16(%ebp), %eax
+	jl	.L3
+	.loc 1 8 0 is_stmt 1
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE0:
+	.size	memory_copy, .-memory_copy
+	.globl	memory_set
+	.type	memory_set, @function
+memory_set:
+.LFB1:
+	.loc 1 10 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$20, %esp
+	movl	12(%ebp), %eax
+	movb	%al, -20(%ebp)
+	.loc 1 11 0
+	movl	8(%ebp), %eax
+	movl	%eax, -4(%ebp)
+	.loc 1 12 0
+	jmp	.L5
+.L6:
+	.loc 1 12 0 is_stmt 0 discriminator 2
+	movl	-4(%ebp), %eax
+	leal	1(%eax), %edx
+	movl	%edx, -4(%ebp)
+	movzbl	-20(%ebp), %edx
+	movb	%dl, (%eax)
+	subl	$1, 16(%ebp)
+.L5:
+	.loc 1 12 0 discriminator 1
+	cmpl	$0, 16(%ebp)
+	jne	.L6
+	.loc 1 13 0 is_stmt 1
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE1:
+	.size	memory_set, .-memory_set
+	.section	.rodata
+.LC0:
+	.string	"Inside kmalloc phys_addr = "
+.LC1:
+	.string	"\n"
+	.text
+	.globl	kmalloc
+	.type	kmalloc, @function
+kmalloc:
+.LFB2:
+	.loc 1 18 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$40, %esp
+	.loc 1 20 0
+	cmpl	$1, 12(%ebp)
+	jne	.L8
+	.loc 1 20 0 is_stmt 0 discriminator 1
+	movl	free_mem_addr, %eax
+	andl	$-4096, %eax
+	testl	%eax, %eax
+	je	.L8
+	.loc 1 21 0 is_stmt 1
+	movl	free_mem_addr, %eax
+	andl	$-4096, %eax
+	movl	%eax, free_mem_addr
+	.loc 1 22 0
+	movl	free_mem_addr, %eax
+	addl	$4096, %eax
+	movl	%eax, free_mem_addr
+.L8:
+	.loc 1 27 0
+	movl	16(%ebp), %eax
+	movl	(%eax), %eax
+	movl	%eax, %edx
+	subl	$8, %esp
+	leal	-28(%ebp), %eax
+	pushl	%eax
+	pushl	%edx
+	call	hex_to_ascii
+	addl	$16, %esp
+	.loc 1 28 0
+	subl	$12, %esp
+	pushl	$.LC0
+	call	kprint
+	addl	$16, %esp
+	.loc 1 29 0
+	subl	$12, %esp
+	leal	-28(%ebp), %eax
+	pushl	%eax
+	call	kprint
+	addl	$16, %esp
+	.loc 1 30 0
+	subl	$12, %esp
+	pushl	$.LC1
+	call	kprint
+	addl	$16, %esp
+	.loc 1 33 0
+	movl	free_mem_addr, %edx
+	movl	16(%ebp), %eax
+	movl	%edx, (%eax)
+	.loc 1 35 0
+	movl	16(%ebp), %eax
+	movl	(%eax), %eax
+	movl	%eax, %edx
+	subl	$8, %esp
+	leal	-28(%ebp), %eax
+	pushl	%eax
+	pushl	%edx
+	call	hex_to_ascii
+	addl	$16, %esp
+	.loc 1 36 0
+	subl	$12, %esp
+	pushl	$.LC0
+	call	kprint
+	addl	$16, %esp
+	.loc 1 37 0
+	subl	$12, %esp
+	leal	-28(%ebp), %eax
+	pushl	%eax
+	call	kprint
+	addl	$16, %esp
+	.loc 1 38 0
+	subl	$12, %esp
+	pushl	$.LC1
+	call	kprint
+	addl	$16, %esp
+	.loc 1 40 0
+	movl	free_mem_addr, %eax
+	movl	%eax, -12(%ebp)
+	.loc 1 41 0
+	movl	free_mem_addr, %edx
+	movl	8(%ebp), %eax
+	addl	%edx, %eax
+	movl	%eax, free_mem_addr
+	.loc 1 42 0
+	movl	-12(%ebp), %eax
+	.loc 1 43 0
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE2:
+	.size	kmalloc, .-kmalloc
+.Letext0:
+	.file 2 "./libc/../cpu/types.h"
+	.file 3 "./libc/globals.h"
+	.section	.debug_info,"",@progbits
+.Ldebug_info0:
+	.long	0x187
+	.value	0x4
+	.long	.Ldebug_abbrev0
+	.byte	0x4
+	.uleb128 0x1
+	.long	.LASF15
+	.byte	0xc
+	.long	.LASF16
+	.long	.LASF17
+	.long	.Ltext0
+	.long	.Letext0-.Ltext0
+	.long	.Ldebug_line0
+	.uleb128 0x2
+	.string	"u32"
+	.byte	0x2
+	.byte	0x6
+	.long	0x30
+	.uleb128 0x3
+	.byte	0x4
+	.byte	0x7
+	.long	.LASF0
+	.uleb128 0x4
+	.byte	0x4
+	.byte	0x5
+	.string	"int"
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x7
+	.long	.LASF1
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x5
+	.long	.LASF2
+	.uleb128 0x2
+	.string	"u8"
+	.byte	0x2
+	.byte	0xa
+	.long	0x56
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x8
+	.long	.LASF3
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x6
+	.long	.LASF4
+	.uleb128 0x5
+	.long	.LASF8
+	.byte	0x1
+	.byte	0x3
+	.long	.LFB0
+	.long	.LFE0-.LFB0
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0xb0
+	.uleb128 0x6
+	.long	.LASF5
+	.byte	0x1
+	.byte	0x3
+	.long	0xb0
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.uleb128 0x6
+	.long	.LASF6
+	.byte	0x1
+	.byte	0x3
+	.long	0xb0
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 4
+	.uleb128 0x6
+	.long	.LASF7
+	.byte	0x1
+	.byte	0x3
+	.long	0x37
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 8
+	.uleb128 0x7
+	.string	"i"
+	.byte	0x1
+	.byte	0x4
+	.long	0x37
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -12
+	.byte	0
+	.uleb128 0x8
+	.byte	0x4
+	.long	0x4c
+	.uleb128 0x5
+	.long	.LASF9
+	.byte	0x1
+	.byte	0xa
+	.long	.LFB1
+	.long	.LFE1-.LFB1
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x104
+	.uleb128 0x6
+	.long	.LASF6
+	.byte	0x1
+	.byte	0xa
+	.long	0xb0
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.uleb128 0x9
+	.string	"val"
+	.byte	0x1
+	.byte	0xa
+	.long	0x4c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -28
+	.uleb128 0x9
+	.string	"len"
+	.byte	0x1
+	.byte	0xa
+	.long	0x25
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 8
+	.uleb128 0xa
+	.long	.LASF10
+	.byte	0x1
+	.byte	0xb
+	.long	0xb0
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -12
+	.byte	0
+	.uleb128 0xb
+	.long	.LASF18
+	.byte	0x1
+	.byte	0x12
+	.long	0x25
+	.long	.LFB2
+	.long	.LFE2-.LFB2
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x162
+	.uleb128 0x6
+	.long	.LASF11
+	.byte	0x1
+	.byte	0x12
+	.long	0x25
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.uleb128 0x6
+	.long	.LASF12
+	.byte	0x1
+	.byte	0x12
+	.long	0x37
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 4
+	.uleb128 0x6
+	.long	.LASF13
+	.byte	0x1
+	.byte	0x12
+	.long	0x162
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 8
+	.uleb128 0x7
+	.string	"c"
+	.byte	0x1
+	.byte	0x1a
+	.long	0x168
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -36
+	.uleb128 0x7
+	.string	"ret"
+	.byte	0x1
+	.byte	0x28
+	.long	0x25
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -20
+	.byte	0
+	.uleb128 0x8
+	.byte	0x4
+	.long	0x25
+	.uleb128 0xc
+	.long	0x5d
+	.long	0x178
+	.uleb128 0xd
+	.long	0x178
+	.byte	0xf
+	.byte	0
+	.uleb128 0x3
+	.byte	0x4
+	.byte	0x7
+	.long	.LASF14
+	.uleb128 0xe
+	.long	.LASF19
+	.byte	0x3
+	.byte	0x5
+	.long	0x25
+	.byte	0
+	.section	.debug_abbrev,"",@progbits
+.Ldebug_abbrev0:
+	.uleb128 0x1
+	.uleb128 0x11
+	.byte	0x1
+	.uleb128 0x25
+	.uleb128 0xe
+	.uleb128 0x13
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x1b
+	.uleb128 0xe
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x10
+	.uleb128 0x17
+	.byte	0
+	.byte	0
+	.uleb128 0x2
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.byte	0
+	.byte	0
+	.uleb128 0x4
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0x8
+	.byte	0
+	.byte	0
+	.uleb128 0x5
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2117
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x6
+	.uleb128 0x5
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x7
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x8
+	.uleb128 0xf
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x9
+	.uleb128 0x5
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0xa
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2116
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xc
+	.uleb128 0x1
+	.byte	0x1
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xd
+	.uleb128 0x21
+	.byte	0
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2f
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0xe
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3c
+	.uleb128 0x19
+	.byte	0
+	.byte	0
+	.byte	0
+	.section	.debug_aranges,"",@progbits
+	.long	0x1c
+	.value	0x2
+	.long	.Ldebug_info0
+	.byte	0x4
+	.byte	0
+	.value	0
+	.value	0
+	.long	.Ltext0
+	.long	.Letext0-.Ltext0
+	.long	0
+	.long	0
+	.section	.debug_line,"",@progbits
+.Ldebug_line0:
+	.section	.debug_str,"MS",@progbits,1
+.LASF7:
+	.string	"nbytes"
+.LASF16:
+	.string	"./libc/mem.c"
+.LASF0:
+	.string	"unsigned int"
+.LASF6:
+	.string	"dest"
+.LASF3:
+	.string	"unsigned char"
+.LASF10:
+	.string	"temp"
+.LASF17:
+	.string	"/home/os/OS_Project/Part4/10_scheduler"
+.LASF19:
+	.string	"free_mem_addr"
+.LASF4:
+	.string	"char"
+.LASF8:
+	.string	"memory_copy"
+.LASF12:
+	.string	"align"
+.LASF18:
+	.string	"kmalloc"
+.LASF13:
+	.string	"phys_addr"
+.LASF5:
+	.string	"source"
+.LASF15:
+	.string	"GNU C11 5.4.0 20160609 -m32 -mtune=generic -march=i686 -g -fno-pie -ffreestanding -fno-builtin -fno-stack-protector"
+.LASF1:
+	.string	"short unsigned int"
+.LASF11:
+	.string	"size"
+.LASF9:
+	.string	"memory_set"
+.LASF2:
+	.string	"short int"
+.LASF14:
+	.string	"sizetype"
+	.ident	"GCC: (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609"
+	.section	.note.GNU-stack,"",@progbits
diff --git a/Part4/10_scheduler/ports.s b/Part4/10_scheduler/ports.s
new file mode 100644
index 0000000..2b211d6
--- /dev/null
+++ b/Part4/10_scheduler/ports.s
@@ -0,0 +1,501 @@
+	.file	"ports.c"
+	.text
+.Ltext0:
+	.globl	port_byte_in
+	.type	port_byte_in, @function
+port_byte_in:
+.LFB0:
+	.file 1 "./cpu/ports.c"
+	.loc 1 6 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$20, %esp
+	movl	8(%ebp), %eax
+	movw	%ax, -20(%ebp)
+	.loc 1 16 0
+	movzwl	-20(%ebp), %eax
+	movl	%eax, %edx
+#APP
+# 16 "./cpu/ports.c" 1
+	in %dx, %al
+# 0 "" 2
+#NO_APP
+	movb	%al, -1(%ebp)
+	.loc 1 17 0
+	movzbl	-1(%ebp), %eax
+	.loc 1 18 0
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE0:
+	.size	port_byte_in, .-port_byte_in
+	.globl	port_byte_out
+	.type	port_byte_out, @function
+port_byte_out:
+.LFB1:
+	.loc 1 20 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$8, %esp
+	movl	8(%ebp), %edx
+	movl	12(%ebp), %eax
+	movw	%dx, -4(%ebp)
+	movb	%al, -8(%ebp)
+	.loc 1 26 0
+	movzbl	-8(%ebp), %eax
+	movzwl	-4(%ebp), %edx
+#APP
+# 26 "./cpu/ports.c" 1
+	out %al, %dx
+# 0 "" 2
+	.loc 1 27 0
+#NO_APP
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE1:
+	.size	port_byte_out, .-port_byte_out
+	.globl	port_word_in
+	.type	port_word_in, @function
+port_word_in:
+.LFB2:
+	.loc 1 29 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$20, %esp
+	movl	8(%ebp), %eax
+	movw	%ax, -20(%ebp)
+	.loc 1 31 0
+	movzwl	-20(%ebp), %eax
+	movl	%eax, %edx
+#APP
+# 31 "./cpu/ports.c" 1
+	in %dx, %ax
+# 0 "" 2
+#NO_APP
+	movw	%ax, -2(%ebp)
+	.loc 1 32 0
+	movzwl	-2(%ebp), %eax
+	.loc 1 33 0
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE2:
+	.size	port_word_in, .-port_word_in
+	.globl	port_word_out
+	.type	port_word_out, @function
+port_word_out:
+.LFB3:
+	.loc 1 35 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$8, %esp
+	movl	8(%ebp), %edx
+	movl	12(%ebp), %eax
+	movw	%dx, -4(%ebp)
+	movw	%ax, -8(%ebp)
+	.loc 1 36 0
+	movzwl	-8(%ebp), %eax
+	movzwl	-4(%ebp), %edx
+#APP
+# 36 "./cpu/ports.c" 1
+	out %ax, %dx
+# 0 "" 2
+	.loc 1 37 0
+#NO_APP
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE3:
+	.size	port_word_out, .-port_word_out
+.Letext0:
+	.file 2 "./cpu/../cpu/types.h"
+	.section	.debug_info,"",@progbits
+.Ldebug_info0:
+	.long	0x12d
+	.value	0x4
+	.long	.Ldebug_abbrev0
+	.byte	0x4
+	.uleb128 0x1
+	.long	.LASF10
+	.byte	0xc
+	.long	.LASF11
+	.long	.LASF12
+	.long	.Ltext0
+	.long	.Letext0-.Ltext0
+	.long	.Ldebug_line0
+	.uleb128 0x2
+	.byte	0x4
+	.byte	0x7
+	.long	.LASF0
+	.uleb128 0x3
+	.byte	0x4
+	.byte	0x5
+	.string	"int"
+	.uleb128 0x4
+	.string	"u16"
+	.byte	0x2
+	.byte	0x8
+	.long	0x3e
+	.uleb128 0x2
+	.byte	0x2
+	.byte	0x7
+	.long	.LASF1
+	.uleb128 0x2
+	.byte	0x2
+	.byte	0x5
+	.long	.LASF2
+	.uleb128 0x4
+	.string	"u8"
+	.byte	0x2
+	.byte	0xa
+	.long	0x56
+	.uleb128 0x2
+	.byte	0x1
+	.byte	0x8
+	.long	.LASF3
+	.uleb128 0x2
+	.byte	0x1
+	.byte	0x6
+	.long	.LASF4
+	.uleb128 0x5
+	.long	.LASF7
+	.byte	0x1
+	.byte	0x6
+	.long	0x4c
+	.long	.LFB0
+	.long	.LFE0-.LFB0
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x9a
+	.uleb128 0x6
+	.long	.LASF5
+	.byte	0x1
+	.byte	0x6
+	.long	0x33
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -28
+	.uleb128 0x7
+	.long	.LASF9
+	.byte	0x1
+	.byte	0x7
+	.long	0x4c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -9
+	.byte	0
+	.uleb128 0x8
+	.long	.LASF13
+	.byte	0x1
+	.byte	0x14
+	.long	.LFB1
+	.long	.LFE1-.LFB1
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0xcc
+	.uleb128 0x6
+	.long	.LASF5
+	.byte	0x1
+	.byte	0x14
+	.long	0x33
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -12
+	.uleb128 0x6
+	.long	.LASF6
+	.byte	0x1
+	.byte	0x14
+	.long	0x4c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -16
+	.byte	0
+	.uleb128 0x5
+	.long	.LASF8
+	.byte	0x1
+	.byte	0x1d
+	.long	0x33
+	.long	.LFB2
+	.long	.LFE2-.LFB2
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x102
+	.uleb128 0x6
+	.long	.LASF5
+	.byte	0x1
+	.byte	0x1d
+	.long	0x33
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -28
+	.uleb128 0x7
+	.long	.LASF9
+	.byte	0x1
+	.byte	0x1e
+	.long	0x33
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -10
+	.byte	0
+	.uleb128 0x9
+	.long	.LASF14
+	.byte	0x1
+	.byte	0x23
+	.long	.LFB3
+	.long	.LFE3-.LFB3
+	.uleb128 0x1
+	.byte	0x9c
+	.uleb128 0x6
+	.long	.LASF5
+	.byte	0x1
+	.byte	0x23
+	.long	0x33
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -12
+	.uleb128 0x6
+	.long	.LASF6
+	.byte	0x1
+	.byte	0x23
+	.long	0x33
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -16
+	.byte	0
+	.byte	0
+	.section	.debug_abbrev,"",@progbits
+.Ldebug_abbrev0:
+	.uleb128 0x1
+	.uleb128 0x11
+	.byte	0x1
+	.uleb128 0x25
+	.uleb128 0xe
+	.uleb128 0x13
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x1b
+	.uleb128 0xe
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x10
+	.uleb128 0x17
+	.byte	0
+	.byte	0
+	.uleb128 0x2
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.byte	0
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0x8
+	.byte	0
+	.byte	0
+	.uleb128 0x4
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x5
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2117
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x6
+	.uleb128 0x5
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x7
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x8
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2117
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x9
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2117
+	.uleb128 0x19
+	.byte	0
+	.byte	0
+	.byte	0
+	.section	.debug_aranges,"",@progbits
+	.long	0x1c
+	.value	0x2
+	.long	.Ldebug_info0
+	.byte	0x4
+	.byte	0
+	.value	0
+	.value	0
+	.long	.Ltext0
+	.long	.Letext0-.Ltext0
+	.long	0
+	.long	0
+	.section	.debug_line,"",@progbits
+.Ldebug_line0:
+	.section	.debug_str,"MS",@progbits,1
+.LASF0:
+	.string	"unsigned int"
+.LASF12:
+	.string	"/home/os/OS_Project/Part4/10_scheduler"
+.LASF3:
+	.string	"unsigned char"
+.LASF7:
+	.string	"port_byte_in"
+.LASF11:
+	.string	"./cpu/ports.c"
+.LASF10:
+	.string	"GNU C11 5.4.0 20160609 -m32 -mtune=generic -march=i686 -g -fno-pie -ffreestanding -fno-builtin -fno-stack-protector"
+.LASF2:
+	.string	"short int"
+.LASF9:
+	.string	"result"
+.LASF1:
+	.string	"short unsigned int"
+.LASF14:
+	.string	"port_word_out"
+.LASF8:
+	.string	"port_word_in"
+.LASF5:
+	.string	"port"
+.LASF6:
+	.string	"data"
+.LASF4:
+	.string	"char"
+.LASF13:
+	.string	"port_byte_out"
+	.ident	"GCC: (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609"
+	.section	.note.GNU-stack,"",@progbits
diff --git a/Part4/10_scheduler/s_compile.sh b/Part4/10_scheduler/s_compile.sh
old mode 100644
new mode 100755
diff --git a/Part4/10_scheduler/screen.s b/Part4/10_scheduler/screen.s
new file mode 100644
index 0000000..b409ed1
--- /dev/null
+++ b/Part4/10_scheduler/screen.s
@@ -0,0 +1,1345 @@
+	.file	"screen.c"
+	.text
+.Ltext0:
+	.globl	kprint_at
+	.type	kprint_at, @function
+kprint_at:
+.LFB0:
+	.file 1 "./drivers/screen.c"
+	.loc 1 21 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$24, %esp
+	.loc 1 24 0
+	cmpl	$0, 12(%ebp)
+	js	.L2
+	.loc 1 24 0 is_stmt 0 discriminator 1
+	cmpl	$0, 16(%ebp)
+	js	.L2
+	.loc 1 25 0 is_stmt 1
+	subl	$8, %esp
+	pushl	16(%ebp)
+	pushl	12(%ebp)
+	call	get_offset
+	addl	$16, %esp
+	movl	%eax, -16(%ebp)
+	jmp	.L3
+.L2:
+	.loc 1 27 0
+	call	get_cursor_offset
+	movl	%eax, -16(%ebp)
+	.loc 1 28 0
+	subl	$12, %esp
+	pushl	-16(%ebp)
+	call	get_offset_row
+	addl	$16, %esp
+	movl	%eax, 16(%ebp)
+	.loc 1 29 0
+	subl	$12, %esp
+	pushl	-16(%ebp)
+	call	get_offset_col
+	addl	$16, %esp
+	movl	%eax, 12(%ebp)
+.L3:
+	.loc 1 33 0
+	movl	$0, -12(%ebp)
+	.loc 1 34 0
+	jmp	.L4
+.L5:
+	.loc 1 35 0
+	movl	-12(%ebp), %eax
+	leal	1(%eax), %edx
+	movl	%edx, -12(%ebp)
+	movl	%eax, %edx
+	movl	8(%ebp), %eax
+	addl	%edx, %eax
+	movzbl	(%eax), %eax
+	movsbl	%al, %eax
+	pushl	$15
+	pushl	16(%ebp)
+	pushl	12(%ebp)
+	pushl	%eax
+	call	print_char
+	addl	$16, %esp
+	movl	%eax, -16(%ebp)
+	.loc 1 37 0
+	subl	$12, %esp
+	pushl	-16(%ebp)
+	call	get_offset_row
+	addl	$16, %esp
+	movl	%eax, 16(%ebp)
+	.loc 1 38 0
+	subl	$12, %esp
+	pushl	-16(%ebp)
+	call	get_offset_col
+	addl	$16, %esp
+	movl	%eax, 12(%ebp)
+.L4:
+	.loc 1 34 0
+	movl	-12(%ebp), %edx
+	movl	8(%ebp), %eax
+	addl	%edx, %eax
+	movzbl	(%eax), %eax
+	testb	%al, %al
+	jne	.L5
+	.loc 1 40 0
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE0:
+	.size	kprint_at, .-kprint_at
+	.globl	kprint
+	.type	kprint, @function
+kprint:
+.LFB1:
+	.loc 1 42 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$8, %esp
+	.loc 1 43 0
+	subl	$4, %esp
+	pushl	$-1
+	pushl	$-1
+	pushl	8(%ebp)
+	call	kprint_at
+	addl	$16, %esp
+	.loc 1 44 0
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE1:
+	.size	kprint, .-kprint
+	.globl	kprint_backspace
+	.type	kprint_backspace, @function
+kprint_backspace:
+.LFB2:
+	.loc 1 46 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$24, %esp
+	.loc 1 47 0
+	call	get_cursor_offset
+	subl	$2, %eax
+	movl	%eax, -12(%ebp)
+	.loc 1 48 0
+	subl	$12, %esp
+	pushl	-12(%ebp)
+	call	get_offset_row
+	addl	$16, %esp
+	movl	%eax, -16(%ebp)
+	.loc 1 49 0
+	subl	$12, %esp
+	pushl	-12(%ebp)
+	call	get_offset_col
+	addl	$16, %esp
+	movl	%eax, -20(%ebp)
+	.loc 1 50 0
+	pushl	$15
+	pushl	-16(%ebp)
+	pushl	-20(%ebp)
+	pushl	$8
+	call	print_char
+	addl	$16, %esp
+	.loc 1 51 0
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE2:
+	.size	kprint_backspace, .-kprint_backspace
+	.globl	print_char
+	.type	print_char, @function
+print_char:
+.LFB3:
+	.loc 1 67 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	pushl	%ebx
+	subl	$36, %esp
+	.cfi_offset 3, -12
+	movl	8(%ebp), %edx
+	movl	20(%ebp), %eax
+	movb	%dl, -28(%ebp)
+	movb	%al, -32(%ebp)
+	.loc 1 68 0
+	movl	$753664, -20(%ebp)
+	.loc 1 69 0
+	cmpb	$0, -32(%ebp)
+	jne	.L9
+	.loc 1 69 0 is_stmt 0 discriminator 1
+	movb	$15, -32(%ebp)
+.L9:
+	.loc 1 72 0 is_stmt 1
+	cmpl	$79, 12(%ebp)
+	jg	.L10
+	.loc 1 72 0 is_stmt 0 discriminator 1
+	cmpl	$24, 16(%ebp)
+	jle	.L11
+.L10:
+	.loc 1 73 0 is_stmt 1
+	movl	-20(%ebp), %eax
+	addl	$3998, %eax
+	movb	$69, (%eax)
+	.loc 1 74 0
+	movl	-20(%ebp), %eax
+	addl	$3999, %eax
+	movb	$-12, (%eax)
+	.loc 1 75 0
+	subl	$8, %esp
+	pushl	16(%ebp)
+	pushl	12(%ebp)
+	call	get_offset
+	addl	$16, %esp
+	jmp	.L12
+.L11:
+	.loc 1 79 0
+	cmpl	$0, 12(%ebp)
+	js	.L13
+	.loc 1 79 0 is_stmt 0 discriminator 1
+	cmpl	$0, 16(%ebp)
+	js	.L13
+	.loc 1 79 0 discriminator 2
+	subl	$8, %esp
+	pushl	16(%ebp)
+	pushl	12(%ebp)
+	call	get_offset
+	addl	$16, %esp
+	movl	%eax, -12(%ebp)
+	jmp	.L14
+.L13:
+	.loc 1 80 0 is_stmt 1
+	call	get_cursor_offset
+	movl	%eax, -12(%ebp)
+.L14:
+	.loc 1 82 0
+	cmpb	$10, -28(%ebp)
+	jne	.L15
+	.loc 1 83 0
+	subl	$12, %esp
+	pushl	-12(%ebp)
+	call	get_offset_row
+	addl	$16, %esp
+	movl	%eax, 16(%ebp)
+	.loc 1 84 0
+	movl	16(%ebp), %eax
+	addl	$1, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$0
+	call	get_offset
+	addl	$16, %esp
+	movl	%eax, -12(%ebp)
+	jmp	.L16
+.L15:
+	.loc 1 85 0
+	cmpb	$8, -28(%ebp)
+	jne	.L17
+	.loc 1 86 0
+	movl	-12(%ebp), %edx
+	movl	-20(%ebp), %eax
+	addl	%edx, %eax
+	movb	$32, (%eax)
+	.loc 1 87 0
+	movl	-12(%ebp), %eax
+	leal	1(%eax), %edx
+	movl	-20(%ebp), %eax
+	addl	%eax, %edx
+	movzbl	-32(%ebp), %eax
+	movb	%al, (%edx)
+	jmp	.L16
+.L17:
+	.loc 1 89 0
+	movl	-12(%ebp), %edx
+	movl	-20(%ebp), %eax
+	addl	%eax, %edx
+	movzbl	-28(%ebp), %eax
+	movb	%al, (%edx)
+	.loc 1 90 0
+	movl	-12(%ebp), %eax
+	leal	1(%eax), %edx
+	movl	-20(%ebp), %eax
+	addl	%eax, %edx
+	movzbl	-32(%ebp), %eax
+	movb	%al, (%edx)
+	.loc 1 91 0
+	addl	$2, -12(%ebp)
+.L16:
+	.loc 1 95 0
+	cmpl	$3999, -12(%ebp)
+	jle	.L18
+.LBB2:
+	.loc 1 97 0
+	movl	$1, -16(%ebp)
+	jmp	.L19
+.L20:
+	.loc 1 99 0 discriminator 3
+	movl	-16(%ebp), %eax
+	subl	$1, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$0
+	call	get_offset
+	addl	$16, %esp
+	addl	$753664, %eax
+	.loc 1 98 0 discriminator 3
+	movl	%eax, %ebx
+	subl	$8, %esp
+	pushl	-16(%ebp)
+	pushl	$0
+	call	get_offset
+	addl	$16, %esp
+	addl	$753664, %eax
+	subl	$4, %esp
+	pushl	$160
+	pushl	%ebx
+	pushl	%eax
+	call	memory_copy
+	addl	$16, %esp
+	.loc 1 97 0 discriminator 3
+	addl	$1, -16(%ebp)
+.L19:
+	.loc 1 97 0 is_stmt 0 discriminator 1
+	cmpl	$24, -16(%ebp)
+	jle	.L20
+	.loc 1 103 0 is_stmt 1
+	subl	$8, %esp
+	pushl	$24
+	pushl	$0
+	call	get_offset
+	addl	$16, %esp
+	addl	$753664, %eax
+	movl	%eax, -24(%ebp)
+	.loc 1 104 0
+	movl	$0, -16(%ebp)
+	jmp	.L21
+.L22:
+	.loc 1 104 0 is_stmt 0 discriminator 3
+	movl	-16(%ebp), %edx
+	movl	-24(%ebp), %eax
+	addl	%edx, %eax
+	movb	$0, (%eax)
+	addl	$1, -16(%ebp)
+.L21:
+	.loc 1 104 0 discriminator 1
+	cmpl	$159, -16(%ebp)
+	jle	.L22
+	.loc 1 106 0 is_stmt 1
+	subl	$160, -12(%ebp)
+.L18:
+.LBE2:
+	.loc 1 109 0
+	subl	$12, %esp
+	pushl	-12(%ebp)
+	call	set_cursor_offset
+	addl	$16, %esp
+	.loc 1 110 0
+	movl	-12(%ebp), %eax
+.L12:
+	.loc 1 111 0
+	movl	-4(%ebp), %ebx
+	leave
+	.cfi_restore 5
+	.cfi_restore 3
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE3:
+	.size	print_char, .-print_char
+	.globl	get_cursor_offset
+	.type	get_cursor_offset, @function
+get_cursor_offset:
+.LFB4:
+	.loc 1 113 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$24, %esp
+	.loc 1 118 0
+	subl	$8, %esp
+	pushl	$14
+	pushl	$980
+	call	port_byte_out
+	addl	$16, %esp
+	.loc 1 119 0
+	subl	$12, %esp
+	pushl	$981
+	call	port_byte_in
+	addl	$16, %esp
+	movzbl	%al, %eax
+	sall	$8, %eax
+	movl	%eax, -12(%ebp)
+	.loc 1 120 0
+	subl	$8, %esp
+	pushl	$15
+	pushl	$980
+	call	port_byte_out
+	addl	$16, %esp
+	.loc 1 121 0
+	subl	$12, %esp
+	pushl	$981
+	call	port_byte_in
+	addl	$16, %esp
+	movzbl	%al, %eax
+	addl	%eax, -12(%ebp)
+	.loc 1 122 0
+	movl	-12(%ebp), %eax
+	addl	%eax, %eax
+	.loc 1 123 0
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE4:
+	.size	get_cursor_offset, .-get_cursor_offset
+	.globl	set_cursor_offset
+	.type	set_cursor_offset, @function
+set_cursor_offset:
+.LFB5:
+	.loc 1 125 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$8, %esp
+	.loc 1 127 0
+	movl	8(%ebp), %eax
+	movl	%eax, %edx
+	shrl	$31, %edx
+	addl	%edx, %eax
+	sarl	%eax
+	movl	%eax, 8(%ebp)
+	.loc 1 128 0
+	subl	$8, %esp
+	pushl	$14
+	pushl	$980
+	call	port_byte_out
+	addl	$16, %esp
+	.loc 1 129 0
+	movl	8(%ebp), %eax
+	sarl	$8, %eax
+	movzbl	%al, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$981
+	call	port_byte_out
+	addl	$16, %esp
+	.loc 1 130 0
+	subl	$8, %esp
+	pushl	$15
+	pushl	$980
+	call	port_byte_out
+	addl	$16, %esp
+	.loc 1 131 0
+	movl	8(%ebp), %eax
+	movzbl	%al, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$981
+	call	port_byte_out
+	addl	$16, %esp
+	.loc 1 132 0
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE5:
+	.size	set_cursor_offset, .-set_cursor_offset
+	.globl	clear_screen
+	.type	clear_screen, @function
+clear_screen:
+.LFB6:
+	.loc 1 134 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$24, %esp
+	.loc 1 135 0
+	movl	$2000, -16(%ebp)
+	.loc 1 137 0
+	movl	$753664, -20(%ebp)
+	.loc 1 139 0
+	movl	$0, -12(%ebp)
+	jmp	.L27
+.L28:
+	.loc 1 140 0 discriminator 3
+	movl	-12(%ebp), %eax
+	addl	%eax, %eax
+	movl	%eax, %edx
+	movl	-20(%ebp), %eax
+	addl	%edx, %eax
+	movb	$32, (%eax)
+	.loc 1 141 0 discriminator 3
+	movl	-12(%ebp), %eax
+	addl	%eax, %eax
+	leal	1(%eax), %edx
+	movl	-20(%ebp), %eax
+	addl	%edx, %eax
+	movb	$15, (%eax)
+	.loc 1 139 0 discriminator 3
+	addl	$1, -12(%ebp)
+.L27:
+	.loc 1 139 0 is_stmt 0 discriminator 1
+	movl	-12(%ebp), %eax
+	cmpl	-16(%ebp), %eax
+	jl	.L28
+	.loc 1 143 0 is_stmt 1
+	subl	$8, %esp
+	pushl	$0
+	pushl	$0
+	call	get_offset
+	addl	$16, %esp
+	subl	$12, %esp
+	pushl	%eax
+	call	set_cursor_offset
+	addl	$16, %esp
+	.loc 1 144 0
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE6:
+	.size	clear_screen, .-clear_screen
+	.globl	get_offset
+	.type	get_offset, @function
+get_offset:
+.LFB7:
+	.loc 1 147 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	.loc 1 147 0
+	movl	12(%ebp), %edx
+	movl	%edx, %eax
+	sall	$2, %eax
+	addl	%edx, %eax
+	sall	$4, %eax
+	movl	%eax, %edx
+	movl	8(%ebp), %eax
+	addl	%edx, %eax
+	addl	%eax, %eax
+	popl	%ebp
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE7:
+	.size	get_offset, .-get_offset
+	.globl	get_offset_row
+	.type	get_offset_row, @function
+get_offset_row:
+.LFB8:
+	.loc 1 148 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	.loc 1 148 0
+	movl	8(%ebp), %ecx
+	movl	$1717986919, %edx
+	movl	%ecx, %eax
+	imull	%edx
+	sarl	$6, %edx
+	movl	%ecx, %eax
+	sarl	$31, %eax
+	subl	%eax, %edx
+	movl	%edx, %eax
+	popl	%ebp
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE8:
+	.size	get_offset_row, .-get_offset_row
+	.globl	get_offset_col
+	.type	get_offset_col, @function
+get_offset_col:
+.LFB9:
+	.loc 1 149 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	.loc 1 149 0
+	pushl	8(%ebp)
+	call	get_offset_row
+	addl	$4, %esp
+	imull	$-160, %eax, %edx
+	movl	8(%ebp), %eax
+	addl	%edx, %eax
+	movl	%eax, %edx
+	shrl	$31, %edx
+	addl	%edx, %eax
+	sarl	%eax
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE9:
+	.size	get_offset_col, .-get_offset_col
+.Letext0:
+	.file 2 "./drivers/../cpu/types.h"
+	.section	.debug_info,"",@progbits
+.Ldebug_info0:
+	.long	0x2bc
+	.value	0x4
+	.long	.Ldebug_abbrev0
+	.byte	0x4
+	.uleb128 0x1
+	.long	.LASF22
+	.byte	0xc
+	.long	.LASF23
+	.long	.LASF24
+	.long	.Ltext0
+	.long	.Letext0-.Ltext0
+	.long	.Ldebug_line0
+	.uleb128 0x2
+	.byte	0x4
+	.byte	0x7
+	.long	.LASF0
+	.uleb128 0x3
+	.byte	0x4
+	.byte	0x5
+	.string	"int"
+	.uleb128 0x2
+	.byte	0x2
+	.byte	0x7
+	.long	.LASF1
+	.uleb128 0x2
+	.byte	0x2
+	.byte	0x5
+	.long	.LASF2
+	.uleb128 0x4
+	.string	"u8"
+	.byte	0x2
+	.byte	0xa
+	.long	0x4b
+	.uleb128 0x2
+	.byte	0x1
+	.byte	0x8
+	.long	.LASF3
+	.uleb128 0x2
+	.byte	0x1
+	.byte	0x6
+	.long	.LASF4
+	.uleb128 0x5
+	.long	.LASF7
+	.byte	0x1
+	.byte	0x15
+	.long	.LFB0
+	.long	.LFE0-.LFB0
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0xb3
+	.uleb128 0x6
+	.long	.LASF5
+	.byte	0x1
+	.byte	0x15
+	.long	0xb3
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.uleb128 0x7
+	.string	"col"
+	.byte	0x1
+	.byte	0x15
+	.long	0x2c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 4
+	.uleb128 0x7
+	.string	"row"
+	.byte	0x1
+	.byte	0x15
+	.long	0x2c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 8
+	.uleb128 0x8
+	.long	.LASF6
+	.byte	0x1
+	.byte	0x17
+	.long	0x2c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -24
+	.uleb128 0x9
+	.string	"i"
+	.byte	0x1
+	.byte	0x21
+	.long	0x2c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -20
+	.byte	0
+	.uleb128 0xa
+	.byte	0x4
+	.long	0x52
+	.uleb128 0x5
+	.long	.LASF8
+	.byte	0x1
+	.byte	0x2a
+	.long	.LFB1
+	.long	.LFE1-.LFB1
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0xdd
+	.uleb128 0x6
+	.long	.LASF5
+	.byte	0x1
+	.byte	0x2a
+	.long	0xb3
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.byte	0
+	.uleb128 0xb
+	.long	.LASF14
+	.byte	0x1
+	.byte	0x2e
+	.long	.LFB2
+	.long	.LFE2-.LFB2
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x11d
+	.uleb128 0x8
+	.long	.LASF6
+	.byte	0x1
+	.byte	0x2f
+	.long	0x2c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -20
+	.uleb128 0x9
+	.string	"row"
+	.byte	0x1
+	.byte	0x30
+	.long	0x2c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -24
+	.uleb128 0x9
+	.string	"col"
+	.byte	0x1
+	.byte	0x31
+	.long	0x2c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -28
+	.byte	0
+	.uleb128 0xc
+	.long	.LASF18
+	.byte	0x1
+	.byte	0x43
+	.long	0x2c
+	.long	.LFB3
+	.long	.LFE3-.LFB3
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x1ad
+	.uleb128 0x7
+	.string	"c"
+	.byte	0x1
+	.byte	0x43
+	.long	0x52
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -36
+	.uleb128 0x7
+	.string	"col"
+	.byte	0x1
+	.byte	0x43
+	.long	0x2c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 4
+	.uleb128 0x7
+	.string	"row"
+	.byte	0x1
+	.byte	0x43
+	.long	0x2c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 8
+	.uleb128 0x6
+	.long	.LASF9
+	.byte	0x1
+	.byte	0x43
+	.long	0x52
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -40
+	.uleb128 0x8
+	.long	.LASF10
+	.byte	0x1
+	.byte	0x44
+	.long	0x1ad
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -28
+	.uleb128 0x8
+	.long	.LASF6
+	.byte	0x1
+	.byte	0x4e
+	.long	0x2c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -20
+	.uleb128 0xd
+	.long	.LBB2
+	.long	.LBE2-.LBB2
+	.uleb128 0x9
+	.string	"i"
+	.byte	0x1
+	.byte	0x60
+	.long	0x2c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -24
+	.uleb128 0x8
+	.long	.LASF11
+	.byte	0x1
+	.byte	0x67
+	.long	0xb3
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -32
+	.byte	0
+	.byte	0
+	.uleb128 0xa
+	.byte	0x4
+	.long	0x41
+	.uleb128 0xe
+	.long	.LASF12
+	.byte	0x1
+	.byte	0x71
+	.long	0x2c
+	.long	.LFB4
+	.long	.LFE4-.LFB4
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x1db
+	.uleb128 0x8
+	.long	.LASF6
+	.byte	0x1
+	.byte	0x77
+	.long	0x2c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -20
+	.byte	0
+	.uleb128 0x5
+	.long	.LASF13
+	.byte	0x1
+	.byte	0x7d
+	.long	.LFB5
+	.long	.LFE5-.LFB5
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x1ff
+	.uleb128 0x6
+	.long	.LASF6
+	.byte	0x1
+	.byte	0x7d
+	.long	0x2c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.byte	0
+	.uleb128 0xb
+	.long	.LASF15
+	.byte	0x1
+	.byte	0x86
+	.long	.LFB6
+	.long	.LFE6-.LFB6
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x23d
+	.uleb128 0x8
+	.long	.LASF16
+	.byte	0x1
+	.byte	0x87
+	.long	0x2c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -24
+	.uleb128 0x9
+	.string	"i"
+	.byte	0x1
+	.byte	0x88
+	.long	0x2c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -20
+	.uleb128 0x8
+	.long	.LASF17
+	.byte	0x1
+	.byte	0x89
+	.long	0x1ad
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -28
+	.byte	0
+	.uleb128 0xf
+	.long	.LASF19
+	.byte	0x1
+	.byte	0x93
+	.long	0x2c
+	.long	.LFB7
+	.long	.LFE7-.LFB7
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x273
+	.uleb128 0x7
+	.string	"col"
+	.byte	0x1
+	.byte	0x93
+	.long	0x2c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.uleb128 0x7
+	.string	"row"
+	.byte	0x1
+	.byte	0x93
+	.long	0x2c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 4
+	.byte	0
+	.uleb128 0xf
+	.long	.LASF20
+	.byte	0x1
+	.byte	0x94
+	.long	0x2c
+	.long	.LFB8
+	.long	.LFE8-.LFB8
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x29b
+	.uleb128 0x6
+	.long	.LASF6
+	.byte	0x1
+	.byte	0x94
+	.long	0x2c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.byte	0
+	.uleb128 0x10
+	.long	.LASF21
+	.byte	0x1
+	.byte	0x95
+	.long	0x2c
+	.long	.LFB9
+	.long	.LFE9-.LFB9
+	.uleb128 0x1
+	.byte	0x9c
+	.uleb128 0x6
+	.long	.LASF6
+	.byte	0x1
+	.byte	0x95
+	.long	0x2c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.byte	0
+	.byte	0
+	.section	.debug_abbrev,"",@progbits
+.Ldebug_abbrev0:
+	.uleb128 0x1
+	.uleb128 0x11
+	.byte	0x1
+	.uleb128 0x25
+	.uleb128 0xe
+	.uleb128 0x13
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x1b
+	.uleb128 0xe
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x10
+	.uleb128 0x17
+	.byte	0
+	.byte	0
+	.uleb128 0x2
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.byte	0
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0x8
+	.byte	0
+	.byte	0
+	.uleb128 0x4
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x5
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2116
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x6
+	.uleb128 0x5
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x7
+	.uleb128 0x5
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x8
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x9
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0xa
+	.uleb128 0xf
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2116
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xc
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2116
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xd
+	.uleb128 0xb
+	.byte	0x1
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.byte	0
+	.byte	0
+	.uleb128 0xe
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2116
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xf
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2117
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x10
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2116
+	.uleb128 0x19
+	.byte	0
+	.byte	0
+	.byte	0
+	.section	.debug_aranges,"",@progbits
+	.long	0x1c
+	.value	0x2
+	.long	.Ldebug_info0
+	.byte	0x4
+	.byte	0
+	.value	0
+	.value	0
+	.long	.Ltext0
+	.long	.Letext0-.Ltext0
+	.long	0
+	.long	0
+	.section	.debug_line,"",@progbits
+.Ldebug_line0:
+	.section	.debug_str,"MS",@progbits,1
+.LASF5:
+	.string	"message"
+.LASF14:
+	.string	"kprint_backspace"
+.LASF0:
+	.string	"unsigned int"
+.LASF21:
+	.string	"get_offset_col"
+.LASF3:
+	.string	"unsigned char"
+.LASF7:
+	.string	"kprint_at"
+.LASF19:
+	.string	"get_offset"
+.LASF24:
+	.string	"/home/os/OS_Project/Part4/10_scheduler"
+.LASF13:
+	.string	"set_cursor_offset"
+.LASF16:
+	.string	"screen_size"
+.LASF8:
+	.string	"kprint"
+.LASF9:
+	.string	"attr"
+.LASF6:
+	.string	"offset"
+.LASF11:
+	.string	"last_line"
+.LASF4:
+	.string	"char"
+.LASF17:
+	.string	"screen"
+.LASF22:
+	.string	"GNU C11 5.4.0 20160609 -m32 -mtune=generic -march=i686 -g -fno-pie -ffreestanding -fno-builtin -fno-stack-protector"
+.LASF1:
+	.string	"short unsigned int"
+.LASF23:
+	.string	"./drivers/screen.c"
+.LASF15:
+	.string	"clear_screen"
+.LASF12:
+	.string	"get_cursor_offset"
+.LASF10:
+	.string	"vidmem"
+.LASF2:
+	.string	"short int"
+.LASF18:
+	.string	"print_char"
+.LASF20:
+	.string	"get_offset_row"
+	.ident	"GCC: (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609"
+	.section	.note.GNU-stack,"",@progbits
diff --git a/Part4/10_scheduler/string.s b/Part4/10_scheduler/string.s
new file mode 100644
index 0000000..d4baab9
--- /dev/null
+++ b/Part4/10_scheduler/string.s
@@ -0,0 +1,998 @@
+	.file	"string.c"
+	.text
+.Ltext0:
+	.globl	int_to_ascii
+	.type	int_to_ascii, @function
+int_to_ascii:
+.LFB0:
+	.file 1 "./libc/string.c"
+	.loc 1 6 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	pushl	%ebx
+	subl	$20, %esp
+	.cfi_offset 3, -12
+	.loc 1 8 0
+	movl	8(%ebp), %eax
+	movl	%eax, -16(%ebp)
+	cmpl	$0, -16(%ebp)
+	jns	.L2
+	.loc 1 8 0 is_stmt 0 discriminator 1
+	negl	8(%ebp)
+.L2:
+	.loc 1 9 0 is_stmt 1
+	movl	$0, -12(%ebp)
+.L3:
+	.loc 1 11 0 discriminator 1
+	movl	-12(%ebp), %eax
+	leal	1(%eax), %edx
+	movl	%edx, -12(%ebp)
+	movl	%eax, %edx
+	movl	12(%ebp), %eax
+	leal	(%edx,%eax), %ebx
+	movl	8(%ebp), %ecx
+	movl	$1717986919, %edx
+	movl	%ecx, %eax
+	imull	%edx
+	sarl	$2, %edx
+	movl	%ecx, %eax
+	sarl	$31, %eax
+	subl	%eax, %edx
+	movl	%edx, %eax
+	sall	$2, %eax
+	addl	%edx, %eax
+	addl	%eax, %eax
+	subl	%eax, %ecx
+	movl	%ecx, %edx
+	movl	%edx, %eax
+	addl	$48, %eax
+	movb	%al, (%ebx)
+	.loc 1 12 0 discriminator 1
+	movl	8(%ebp), %ecx
+	movl	$1717986919, %edx
+	movl	%ecx, %eax
+	imull	%edx
+	sarl	$2, %edx
+	movl	%ecx, %eax
+	sarl	$31, %eax
+	subl	%eax, %edx
+	movl	%edx, %eax
+	movl	%eax, 8(%ebp)
+	cmpl	$0, 8(%ebp)
+	jg	.L3
+	.loc 1 14 0
+	cmpl	$0, -16(%ebp)
+	jns	.L4
+	.loc 1 14 0 is_stmt 0 discriminator 1
+	movl	-12(%ebp), %eax
+	leal	1(%eax), %edx
+	movl	%edx, -12(%ebp)
+	movl	%eax, %edx
+	movl	12(%ebp), %eax
+	addl	%edx, %eax
+	movb	$45, (%eax)
+.L4:
+	.loc 1 15 0 is_stmt 1
+	movl	-12(%ebp), %edx
+	movl	12(%ebp), %eax
+	addl	%edx, %eax
+	movb	$0, (%eax)
+	.loc 1 17 0
+	subl	$12, %esp
+	pushl	12(%ebp)
+	call	reverse
+	addl	$16, %esp
+	.loc 1 18 0
+	nop
+	movl	-4(%ebp), %ebx
+	leave
+	.cfi_restore 5
+	.cfi_restore 3
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE0:
+	.size	int_to_ascii, .-int_to_ascii
+	.globl	hex_to_ascii
+	.type	hex_to_ascii, @function
+hex_to_ascii:
+.LFB1:
+	.loc 1 20 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$24, %esp
+	.loc 1 21 0
+	movl	12(%ebp), %eax
+	movb	$0, (%eax)
+	.loc 1 22 0
+	subl	$8, %esp
+	pushl	$48
+	pushl	12(%ebp)
+	call	append
+	addl	$16, %esp
+	.loc 1 23 0
+	subl	$8, %esp
+	pushl	$120
+	pushl	12(%ebp)
+	call	append
+	addl	$16, %esp
+	.loc 1 24 0
+	movb	$0, -9(%ebp)
+	.loc 1 28 0
+	movl	$28, -16(%ebp)
+	jmp	.L6
+.L10:
+	.loc 1 29 0
+	movl	-16(%ebp), %eax
+	movl	8(%ebp), %edx
+	movl	%eax, %ecx
+	sarl	%cl, %edx
+	movl	%edx, %eax
+	andl	$15, %eax
+	movl	%eax, -20(%ebp)
+	.loc 1 30 0
+	cmpl	$0, -20(%ebp)
+	jne	.L7
+	.loc 1 30 0 is_stmt 0 discriminator 1
+	cmpb	$0, -9(%ebp)
+	je	.L14
+.L7:
+	.loc 1 31 0 is_stmt 1
+	movb	$1, -9(%ebp)
+	.loc 1 32 0
+	cmpl	$10, -20(%ebp)
+	jle	.L9
+	.loc 1 32 0 is_stmt 0 discriminator 1
+	movl	-20(%ebp), %eax
+	addl	$87, %eax
+	movsbl	%al, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	12(%ebp)
+	call	append
+	addl	$16, %esp
+	jmp	.L8
+.L9:
+	.loc 1 33 0 is_stmt 1
+	movl	-20(%ebp), %eax
+	addl	$48, %eax
+	movsbl	%al, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	12(%ebp)
+	call	append
+	addl	$16, %esp
+	jmp	.L8
+.L14:
+	.loc 1 30 0
+	nop
+.L8:
+	.loc 1 28 0 discriminator 2
+	subl	$4, -16(%ebp)
+.L6:
+	.loc 1 28 0 is_stmt 0 discriminator 1
+	cmpl	$0, -16(%ebp)
+	jg	.L10
+	.loc 1 36 0 is_stmt 1
+	movl	8(%ebp), %eax
+	andl	$15, %eax
+	movl	%eax, -20(%ebp)
+	.loc 1 37 0
+	cmpl	$9, -20(%ebp)
+	jle	.L11
+	.loc 1 37 0 is_stmt 0 discriminator 1
+	movl	-20(%ebp), %eax
+	addl	$87, %eax
+	movsbl	%al, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	12(%ebp)
+	call	append
+	addl	$16, %esp
+	.loc 1 40 0 is_stmt 1 discriminator 1
+	jmp	.L5
+.L11:
+	.loc 1 38 0
+	movl	-20(%ebp), %eax
+	addl	$48, %eax
+	movsbl	%al, %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	12(%ebp)
+	call	append
+	addl	$16, %esp
+	.loc 1 40 0
+	nop
+.L5:
+	.loc 1 41 0
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE1:
+	.size	hex_to_ascii, .-hex_to_ascii
+	.globl	reverse
+	.type	reverse, @function
+reverse:
+.LFB2:
+	.loc 1 44 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$24, %esp
+	.loc 1 46 0
+	movl	$0, -12(%ebp)
+	subl	$12, %esp
+	pushl	8(%ebp)
+	call	strlen
+	addl	$16, %esp
+	subl	$1, %eax
+	movl	%eax, -16(%ebp)
+	jmp	.L16
+.L17:
+	.loc 1 47 0 discriminator 3
+	movl	-12(%ebp), %edx
+	movl	8(%ebp), %eax
+	addl	%edx, %eax
+	movzbl	(%eax), %eax
+	movsbl	%al, %eax
+	movl	%eax, -20(%ebp)
+	.loc 1 48 0 discriminator 3
+	movl	-12(%ebp), %edx
+	movl	8(%ebp), %eax
+	addl	%eax, %edx
+	movl	-16(%ebp), %ecx
+	movl	8(%ebp), %eax
+	addl	%ecx, %eax
+	movzbl	(%eax), %eax
+	movb	%al, (%edx)
+	.loc 1 49 0 discriminator 3
+	movl	-16(%ebp), %edx
+	movl	8(%ebp), %eax
+	addl	%edx, %eax
+	movl	-20(%ebp), %edx
+	movb	%dl, (%eax)
+	.loc 1 46 0 discriminator 3
+	addl	$1, -12(%ebp)
+	subl	$1, -16(%ebp)
+.L16:
+	.loc 1 46 0 is_stmt 0 discriminator 1
+	movl	-12(%ebp), %eax
+	cmpl	-16(%ebp), %eax
+	jl	.L17
+	.loc 1 51 0 is_stmt 1
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE2:
+	.size	reverse, .-reverse
+	.globl	strlen
+	.type	strlen, @function
+strlen:
+.LFB3:
+	.loc 1 54 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$16, %esp
+	.loc 1 55 0
+	movl	$0, -4(%ebp)
+	.loc 1 56 0
+	jmp	.L19
+.L20:
+	.loc 1 56 0 is_stmt 0 discriminator 2
+	addl	$1, -4(%ebp)
+.L19:
+	.loc 1 56 0 discriminator 1
+	movl	-4(%ebp), %edx
+	movl	8(%ebp), %eax
+	addl	%edx, %eax
+	movzbl	(%eax), %eax
+	testb	%al, %al
+	jne	.L20
+	.loc 1 57 0 is_stmt 1
+	movl	-4(%ebp), %eax
+	.loc 1 58 0
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE3:
+	.size	strlen, .-strlen
+	.globl	append
+	.type	append, @function
+append:
+.LFB4:
+	.loc 1 60 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$20, %esp
+	movl	12(%ebp), %eax
+	movb	%al, -20(%ebp)
+	.loc 1 61 0
+	pushl	8(%ebp)
+	call	strlen
+	addl	$4, %esp
+	movl	%eax, -4(%ebp)
+	.loc 1 62 0
+	movl	-4(%ebp), %edx
+	movl	8(%ebp), %eax
+	addl	%eax, %edx
+	movzbl	-20(%ebp), %eax
+	movb	%al, (%edx)
+	.loc 1 63 0
+	movl	-4(%ebp), %eax
+	leal	1(%eax), %edx
+	movl	8(%ebp), %eax
+	addl	%edx, %eax
+	movb	$0, (%eax)
+	.loc 1 64 0
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE4:
+	.size	append, .-append
+	.globl	backspace
+	.type	backspace, @function
+backspace:
+.LFB5:
+	.loc 1 66 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$16, %esp
+	.loc 1 67 0
+	pushl	8(%ebp)
+	call	strlen
+	addl	$4, %esp
+	movl	%eax, -4(%ebp)
+	.loc 1 68 0
+	movl	-4(%ebp), %eax
+	leal	-1(%eax), %edx
+	movl	8(%ebp), %eax
+	addl	%edx, %eax
+	movb	$0, (%eax)
+	.loc 1 69 0
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE5:
+	.size	backspace, .-backspace
+	.globl	strcmp
+	.type	strcmp, @function
+strcmp:
+.LFB6:
+	.loc 1 73 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$16, %esp
+	.loc 1 75 0
+	movl	$0, -4(%ebp)
+	jmp	.L25
+.L28:
+	.loc 1 76 0
+	movl	-4(%ebp), %edx
+	movl	8(%ebp), %eax
+	addl	%edx, %eax
+	movzbl	(%eax), %eax
+	testb	%al, %al
+	jne	.L26
+	.loc 1 76 0 is_stmt 0 discriminator 1
+	movl	$0, %eax
+	jmp	.L27
+.L26:
+	.loc 1 75 0 is_stmt 1 discriminator 2
+	addl	$1, -4(%ebp)
+.L25:
+	.loc 1 75 0 is_stmt 0 discriminator 1
+	movl	-4(%ebp), %edx
+	movl	8(%ebp), %eax
+	addl	%edx, %eax
+	movzbl	(%eax), %edx
+	movl	-4(%ebp), %ecx
+	movl	12(%ebp), %eax
+	addl	%ecx, %eax
+	movzbl	(%eax), %eax
+	cmpb	%al, %dl
+	je	.L28
+	.loc 1 78 0 is_stmt 1
+	movl	-4(%ebp), %edx
+	movl	8(%ebp), %eax
+	addl	%edx, %eax
+	movzbl	(%eax), %eax
+	movsbl	%al, %edx
+	movl	-4(%ebp), %ecx
+	movl	12(%ebp), %eax
+	addl	%ecx, %eax
+	movzbl	(%eax), %eax
+	movsbl	%al, %eax
+	subl	%eax, %edx
+	movl	%edx, %eax
+.L27:
+	.loc 1 79 0
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE6:
+	.size	strcmp, .-strcmp
+.Letext0:
+	.file 2 "./libc/../cpu/types.h"
+	.section	.debug_info,"",@progbits
+.Ldebug_info0:
+	.long	0x21f
+	.value	0x4
+	.long	.Ldebug_abbrev0
+	.byte	0x4
+	.uleb128 0x1
+	.long	.LASF13
+	.byte	0xc
+	.long	.LASF14
+	.long	.LASF15
+	.long	.Ltext0
+	.long	.Letext0-.Ltext0
+	.long	.Ldebug_line0
+	.uleb128 0x2
+	.byte	0x4
+	.byte	0x7
+	.long	.LASF0
+	.uleb128 0x3
+	.string	"s32"
+	.byte	0x2
+	.byte	0x7
+	.long	0x37
+	.uleb128 0x4
+	.byte	0x4
+	.byte	0x5
+	.string	"int"
+	.uleb128 0x2
+	.byte	0x2
+	.byte	0x7
+	.long	.LASF1
+	.uleb128 0x2
+	.byte	0x2
+	.byte	0x5
+	.long	.LASF2
+	.uleb128 0x2
+	.byte	0x1
+	.byte	0x8
+	.long	.LASF3
+	.uleb128 0x2
+	.byte	0x1
+	.byte	0x6
+	.long	.LASF4
+	.uleb128 0x5
+	.long	.LASF6
+	.byte	0x1
+	.byte	0x6
+	.long	.LFB0
+	.long	.LFE0-.LFB0
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0xa4
+	.uleb128 0x6
+	.string	"n"
+	.byte	0x1
+	.byte	0x6
+	.long	0x37
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.uleb128 0x6
+	.string	"str"
+	.byte	0x1
+	.byte	0x6
+	.long	0xa4
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 4
+	.uleb128 0x7
+	.string	"i"
+	.byte	0x1
+	.byte	0x7
+	.long	0x37
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -20
+	.uleb128 0x8
+	.long	.LASF5
+	.byte	0x1
+	.byte	0x7
+	.long	0x37
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -24
+	.byte	0
+	.uleb128 0x9
+	.byte	0x4
+	.long	0x53
+	.uleb128 0x5
+	.long	.LASF7
+	.byte	0x1
+	.byte	0x14
+	.long	.LFB1
+	.long	.LFE1-.LFB1
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x102
+	.uleb128 0x6
+	.string	"n"
+	.byte	0x1
+	.byte	0x14
+	.long	0x37
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.uleb128 0x6
+	.string	"str"
+	.byte	0x1
+	.byte	0x14
+	.long	0xa4
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 4
+	.uleb128 0x8
+	.long	.LASF8
+	.byte	0x1
+	.byte	0x18
+	.long	0x53
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -17
+	.uleb128 0x7
+	.string	"tmp"
+	.byte	0x1
+	.byte	0x1a
+	.long	0x2c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -28
+	.uleb128 0x7
+	.string	"i"
+	.byte	0x1
+	.byte	0x1b
+	.long	0x37
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -24
+	.byte	0
+	.uleb128 0x5
+	.long	.LASF9
+	.byte	0x1
+	.byte	0x2c
+	.long	.LFB2
+	.long	.LFE2-.LFB2
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x148
+	.uleb128 0x6
+	.string	"s"
+	.byte	0x1
+	.byte	0x2c
+	.long	0xa4
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.uleb128 0x7
+	.string	"c"
+	.byte	0x1
+	.byte	0x2d
+	.long	0x37
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -28
+	.uleb128 0x7
+	.string	"i"
+	.byte	0x1
+	.byte	0x2d
+	.long	0x37
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -20
+	.uleb128 0x7
+	.string	"j"
+	.byte	0x1
+	.byte	0x2d
+	.long	0x37
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -24
+	.byte	0
+	.uleb128 0xa
+	.long	.LASF16
+	.byte	0x1
+	.byte	0x36
+	.long	0x37
+	.long	.LFB3
+	.long	.LFE3-.LFB3
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x17a
+	.uleb128 0x6
+	.string	"s"
+	.byte	0x1
+	.byte	0x36
+	.long	0xa4
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.uleb128 0x7
+	.string	"i"
+	.byte	0x1
+	.byte	0x37
+	.long	0x37
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -12
+	.byte	0
+	.uleb128 0x5
+	.long	.LASF10
+	.byte	0x1
+	.byte	0x3c
+	.long	.LFB4
+	.long	.LFE4-.LFB4
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x1b6
+	.uleb128 0x6
+	.string	"s"
+	.byte	0x1
+	.byte	0x3c
+	.long	0xa4
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.uleb128 0x6
+	.string	"n"
+	.byte	0x1
+	.byte	0x3c
+	.long	0x53
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -28
+	.uleb128 0x7
+	.string	"len"
+	.byte	0x1
+	.byte	0x3d
+	.long	0x37
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -12
+	.byte	0
+	.uleb128 0x5
+	.long	.LASF11
+	.byte	0x1
+	.byte	0x42
+	.long	.LFB5
+	.long	.LFE5-.LFB5
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x1e6
+	.uleb128 0x6
+	.string	"s"
+	.byte	0x1
+	.byte	0x42
+	.long	0xa4
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.uleb128 0x7
+	.string	"len"
+	.byte	0x1
+	.byte	0x43
+	.long	0x37
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -12
+	.byte	0
+	.uleb128 0xb
+	.long	.LASF12
+	.byte	0x1
+	.byte	0x49
+	.long	0x37
+	.long	.LFB6
+	.long	.LFE6-.LFB6
+	.uleb128 0x1
+	.byte	0x9c
+	.uleb128 0x6
+	.string	"s1"
+	.byte	0x1
+	.byte	0x49
+	.long	0xa4
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.uleb128 0x6
+	.string	"s2"
+	.byte	0x1
+	.byte	0x49
+	.long	0xa4
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 4
+	.uleb128 0x7
+	.string	"i"
+	.byte	0x1
+	.byte	0x4a
+	.long	0x37
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -12
+	.byte	0
+	.byte	0
+	.section	.debug_abbrev,"",@progbits
+.Ldebug_abbrev0:
+	.uleb128 0x1
+	.uleb128 0x11
+	.byte	0x1
+	.uleb128 0x25
+	.uleb128 0xe
+	.uleb128 0x13
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x1b
+	.uleb128 0xe
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x10
+	.uleb128 0x17
+	.byte	0
+	.byte	0
+	.uleb128 0x2
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.byte	0
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x4
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0x8
+	.byte	0
+	.byte	0
+	.uleb128 0x5
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2116
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x6
+	.uleb128 0x5
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x7
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x8
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x9
+	.uleb128 0xf
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xa
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2117
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2117
+	.uleb128 0x19
+	.byte	0
+	.byte	0
+	.byte	0
+	.section	.debug_aranges,"",@progbits
+	.long	0x1c
+	.value	0x2
+	.long	.Ldebug_info0
+	.byte	0x4
+	.byte	0
+	.value	0
+	.value	0
+	.long	.Ltext0
+	.long	.Letext0-.Ltext0
+	.long	0
+	.long	0
+	.section	.debug_line,"",@progbits
+.Ldebug_line0:
+	.section	.debug_str,"MS",@progbits,1
+.LASF0:
+	.string	"unsigned int"
+.LASF8:
+	.string	"zeros"
+.LASF7:
+	.string	"hex_to_ascii"
+.LASF15:
+	.string	"/home/os/OS_Project/Part4/10_scheduler"
+.LASF5:
+	.string	"sign"
+.LASF6:
+	.string	"int_to_ascii"
+.LASF3:
+	.string	"unsigned char"
+.LASF4:
+	.string	"char"
+.LASF12:
+	.string	"strcmp"
+.LASF14:
+	.string	"./libc/string.c"
+.LASF9:
+	.string	"reverse"
+.LASF10:
+	.string	"append"
+.LASF13:
+	.string	"GNU C11 5.4.0 20160609 -m32 -mtune=generic -march=i686 -g -fno-pie -ffreestanding -fno-builtin -fno-stack-protector"
+.LASF16:
+	.string	"strlen"
+.LASF1:
+	.string	"short unsigned int"
+.LASF2:
+	.string	"short int"
+.LASF11:
+	.string	"backspace"
+	.ident	"GCC: (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609"
+	.section	.note.GNU-stack,"",@progbits
diff --git a/Part4/10_scheduler/timer.s b/Part4/10_scheduler/timer.s
new file mode 100644
index 0000000..5afea3f
--- /dev/null
+++ b/Part4/10_scheduler/timer.s
@@ -0,0 +1,601 @@
+	.file	"timer.c"
+	.text
+.Ltext0:
+	.globl	tick
+	.bss
+	.align 4
+	.type	tick, @object
+	.size	tick, 4
+tick:
+	.zero	4
+	.text
+	.type	timer_callback, @function
+timer_callback:
+.LFB0:
+	.file 1 "./cpu/timer.c"
+	.loc 1 8 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	.loc 1 9 0
+	movl	tick, %eax
+	addl	$1, %eax
+	movl	%eax, tick
+	.loc 1 11 0
+	nop
+	popl	%ebp
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE0:
+	.size	timer_callback, .-timer_callback
+	.globl	init_timer
+	.type	init_timer, @function
+init_timer:
+.LFB1:
+	.loc 1 13 0
+	.cfi_startproc
+	pushl	%ebp
+	.cfi_def_cfa_offset 8
+	.cfi_offset 5, -8
+	movl	%esp, %ebp
+	.cfi_def_cfa_register 5
+	subl	$24, %esp
+	.loc 1 15 0
+	subl	$8, %esp
+	pushl	$timer_callback
+	pushl	$32
+	call	register_interrupt_handler
+	addl	$16, %esp
+	.loc 1 18 0
+	movl	$1193180, %eax
+	movl	$0, %edx
+	divl	8(%ebp)
+	movl	%eax, -12(%ebp)
+	.loc 1 19 0
+	movl	-12(%ebp), %eax
+	movb	%al, -13(%ebp)
+	.loc 1 20 0
+	movl	-12(%ebp), %eax
+	shrl	$8, %eax
+	movb	%al, -14(%ebp)
+	.loc 1 22 0
+	subl	$8, %esp
+	pushl	$54
+	pushl	$67
+	call	port_byte_out
+	addl	$16, %esp
+	.loc 1 23 0
+	movzbl	-13(%ebp), %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$64
+	call	port_byte_out
+	addl	$16, %esp
+	.loc 1 24 0
+	movzbl	-14(%ebp), %eax
+	subl	$8, %esp
+	pushl	%eax
+	pushl	$64
+	call	port_byte_out
+	addl	$16, %esp
+	.loc 1 25 0
+	nop
+	leave
+	.cfi_restore 5
+	.cfi_def_cfa 4, 4
+	ret
+	.cfi_endproc
+.LFE1:
+	.size	init_timer, .-init_timer
+.Letext0:
+	.file 2 "./cpu/types.h"
+	.file 3 "./cpu/isr.h"
+	.section	.debug_info,"",@progbits
+.Ldebug_info0:
+	.long	0x1b5
+	.value	0x4
+	.long	.Ldebug_abbrev0
+	.byte	0x4
+	.uleb128 0x1
+	.long	.LASF14
+	.byte	0xc
+	.long	.LASF15
+	.long	.LASF16
+	.long	.Ltext0
+	.long	.Letext0-.Ltext0
+	.long	.Ldebug_line0
+	.uleb128 0x2
+	.string	"u32"
+	.byte	0x2
+	.byte	0x6
+	.long	0x30
+	.uleb128 0x3
+	.byte	0x4
+	.byte	0x7
+	.long	.LASF0
+	.uleb128 0x4
+	.byte	0x4
+	.byte	0x5
+	.string	"int"
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x7
+	.long	.LASF1
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x5
+	.long	.LASF2
+	.uleb128 0x2
+	.string	"u8"
+	.byte	0x2
+	.byte	0xa
+	.long	0x56
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x8
+	.long	.LASF3
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x6
+	.long	.LASF4
+	.uleb128 0x5
+	.byte	0x40
+	.byte	0x3
+	.byte	0x4b
+	.long	0x12a
+	.uleb128 0x6
+	.string	"ds"
+	.byte	0x3
+	.byte	0x4c
+	.long	0x25
+	.byte	0
+	.uleb128 0x6
+	.string	"edi"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0x4
+	.uleb128 0x6
+	.string	"esi"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0x8
+	.uleb128 0x6
+	.string	"ebp"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0xc
+	.uleb128 0x6
+	.string	"esp"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0x10
+	.uleb128 0x6
+	.string	"ebx"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0x14
+	.uleb128 0x6
+	.string	"edx"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0x18
+	.uleb128 0x6
+	.string	"ecx"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0x1c
+	.uleb128 0x6
+	.string	"eax"
+	.byte	0x3
+	.byte	0x4d
+	.long	0x25
+	.byte	0x20
+	.uleb128 0x7
+	.long	.LASF5
+	.byte	0x3
+	.byte	0x4e
+	.long	0x25
+	.byte	0x24
+	.uleb128 0x7
+	.long	.LASF6
+	.byte	0x3
+	.byte	0x4e
+	.long	0x25
+	.byte	0x28
+	.uleb128 0x6
+	.string	"eip"
+	.byte	0x3
+	.byte	0x4f
+	.long	0x25
+	.byte	0x2c
+	.uleb128 0x6
+	.string	"cs"
+	.byte	0x3
+	.byte	0x4f
+	.long	0x25
+	.byte	0x30
+	.uleb128 0x7
+	.long	.LASF7
+	.byte	0x3
+	.byte	0x4f
+	.long	0x25
+	.byte	0x34
+	.uleb128 0x7
+	.long	.LASF8
+	.byte	0x3
+	.byte	0x4f
+	.long	0x25
+	.byte	0x38
+	.uleb128 0x6
+	.string	"ss"
+	.byte	0x3
+	.byte	0x4f
+	.long	0x25
+	.byte	0x3c
+	.byte	0
+	.uleb128 0x8
+	.long	.LASF9
+	.byte	0x3
+	.byte	0x50
+	.long	0x64
+	.uleb128 0x9
+	.long	.LASF17
+	.byte	0x1
+	.byte	0x8
+	.long	.LFB0
+	.long	.LFE0-.LFB0
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x159
+	.uleb128 0xa
+	.long	.LASF10
+	.byte	0x1
+	.byte	0x8
+	.long	0x12a
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.byte	0
+	.uleb128 0xb
+	.long	.LASF18
+	.byte	0x1
+	.byte	0xd
+	.long	.LFB1
+	.long	.LFE1-.LFB1
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x1a7
+	.uleb128 0xa
+	.long	.LASF11
+	.byte	0x1
+	.byte	0xd
+	.long	0x25
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 0
+	.uleb128 0xc
+	.long	.LASF12
+	.byte	0x1
+	.byte	0x12
+	.long	0x25
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -20
+	.uleb128 0xd
+	.string	"low"
+	.byte	0x1
+	.byte	0x13
+	.long	0x4c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -21
+	.uleb128 0xc
+	.long	.LASF13
+	.byte	0x1
+	.byte	0x14
+	.long	0x4c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -22
+	.byte	0
+	.uleb128 0xe
+	.long	.LASF19
+	.byte	0x1
+	.byte	0x6
+	.long	0x25
+	.uleb128 0x5
+	.byte	0x3
+	.long	tick
+	.byte	0
+	.section	.debug_abbrev,"",@progbits
+.Ldebug_abbrev0:
+	.uleb128 0x1
+	.uleb128 0x11
+	.byte	0x1
+	.uleb128 0x25
+	.uleb128 0xe
+	.uleb128 0x13
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x1b
+	.uleb128 0xe
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x10
+	.uleb128 0x17
+	.byte	0
+	.byte	0
+	.uleb128 0x2
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.byte	0
+	.byte	0
+	.uleb128 0x4
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0x8
+	.byte	0
+	.byte	0
+	.uleb128 0x5
+	.uleb128 0x13
+	.byte	0x1
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x6
+	.uleb128 0xd
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x38
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0x7
+	.uleb128 0xd
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x38
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0x8
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x9
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2117
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xa
+	.uleb128 0x5
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x6
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2116
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xc
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0xd
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0xe
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.byte	0
+	.section	.debug_aranges,"",@progbits
+	.long	0x1c
+	.value	0x2
+	.long	.Ldebug_info0
+	.byte	0x4
+	.byte	0
+	.value	0
+	.value	0
+	.long	.Ltext0
+	.long	.Letext0-.Ltext0
+	.long	0
+	.long	0
+	.section	.debug_line,"",@progbits
+.Ldebug_line0:
+	.section	.debug_str,"MS",@progbits,1
+.LASF0:
+	.string	"unsigned int"
+.LASF3:
+	.string	"unsigned char"
+.LASF18:
+	.string	"init_timer"
+.LASF13:
+	.string	"high"
+.LASF15:
+	.string	"./cpu/timer.c"
+.LASF16:
+	.string	"/home/os/OS_Project/Part4/10_scheduler"
+.LASF7:
+	.string	"eflags"
+.LASF19:
+	.string	"tick"
+.LASF4:
+	.string	"char"
+.LASF10:
+	.string	"regs"
+.LASF8:
+	.string	"useresp"
+.LASF17:
+	.string	"timer_callback"
+.LASF14:
+	.string	"GNU C11 5.4.0 20160609 -m32 -mtune=generic -march=i686 -g -fno-pie -ffreestanding -fno-builtin -fno-stack-protector"
+.LASF1:
+	.string	"short unsigned int"
+.LASF6:
+	.string	"err_code"
+.LASF9:
+	.string	"registers_t"
+.LASF12:
+	.string	"divisor"
+.LASF2:
+	.string	"short int"
+.LASF5:
+	.string	"int_no"
+.LASF11:
+	.string	"freq"
+	.ident	"GCC: (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609"
+	.section	.note.GNU-stack,"",@progbits