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I swear this is going to be a long day.

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This commit is contained in:
Jonathan Turner 2023-11-29 08:21:52 -05:00
parent f25003e0d6
commit 18c6d3c858
1 changed files with 110 additions and 123 deletions
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61
Part3/09_memory/kernel/kernel.c
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@ -1,19 +1,17 @@
#include "kernel.h"
#include "kernel.h"
// Standard Bois
#include <string.h>
#include <stdlib.h>
#include "stdio.h"
// This only runs once and from there on forth only interrupts will cause something to happen
// e.g. displaying to screen and taking input from keyboard
void _start() {
// Initialize Global Variables and set up interrrupt handlers
// These variables are a vulnerability to OS security if someone can adjust
// the lower value in the kernel code (exploiting, for example, an Intel address hack)
// than kernel memory and even kernel code can be overwritten
// https://www.wired.com/story/intel-lab-istare-hack-chips/
// See libc/globals.h for KMEM_START and KMEM_END values
// See libc/globals.h for UMEM_START and UMEM_END values
// This only runs once and from there on forth only interrupts will cause something to happen
// e.g. displaying to screen and taking input from keyboard
void _start() {
// Initialize Global Variables and set up interrrupt handlers
// These variables are a vulnerability to OS security if someone can adjust
// the lower value in the kernel code (exploiting, for example, an Intel address hack)
// than kernel memory and even kernel code can be overwritten
// https://www.wired.com/story/intel-lab-istare-hack-chips/
// See libc/globals.h for KMEM_START and KMEM_END values
// See libc/globals.h for UMEM_START and UMEM_END values
kmem_addr = KMEM_START;
kernel_mem_limit = KMEM_END;
@ -29,32 +27,21 @@ void _start() {
kprint("Type something, it will go through the kernel\n"
"Type HELP to list commands\n> ");
}
}
// An interrupt calls this function to parse what was typed in, this is, essentially, your
// Command Line Interpreter for now.
void user_input(char *input) {
// An interrupt calls this function to parse what was typed in, this is, essentially, your
// Command Line Interpreter for now.
void user_input(char *input) {
static u32 delete_id = 0; // static persistent variable for incrementing during test
static node* umem_head = NULL; // static persistent head variable for contiguous block allocations
if (strcmp(input, "END") == 0) {
kprint("Stopping the CPU. Bye!\n");
asm volatile("hlt");
// } else if (strcmp(input, "ADD") == 0) {
// umem_head = add_node( umem_head, 0x10000, 0x100, true, global_id++);
// }
} else if (strncmp(input, "ADD", 3) == 0) {
// Parse the base register value from the user input
char base_str[16];
// Get input from your input source (you need to implement this)
strncpy(base_str, input + 3, sizeof(base_str) - 1); // Skip the command part
base_str[sizeof(base_str) - 1] = '\0'; // Null-terminate the base_str
// Convert base_str to an integer (you need a suitable conversion function)
u32 base = digit_conver(base_str);
// Now you have the base register input, and you can use it as needed
umem_head = add_node(umem_head, base, 0x100, true, global_id++);
} else if (strcmp(input, "ADD") == 0) {
if (sstrlen(input, 15) > 4) {
kprint("owo");
}
umem_head = add_node( umem_head, 0x10000, 0x100, true, global_id++);
} else if (strcmp(input, "LIST") == 0) {
kprint("***** FORWARD ****\n");
print_list( umem_head, true);
@ -117,10 +104,10 @@ void user_input(char *input) {
kprint("\n");
}
kprint("> ");
}
}
int digconver(const char *str) {
int digconver(const char *str) {
int result = 0;
int i = 0;
@ -134,4 +121,4 @@ int digconver(const char *str) {
i++;
}
return result;
}
}