This repository has been archived on 2024-01-18. You can view files and clone it, but cannot push or open issues or pull requests.
OS_Project/Part2/A4/08_shell/drivers/keyboard.c

52 lines
1.7 KiB
C
Raw Normal View History

2023-09-11 18:28:11 +00:00
#include "keyboard.h"
#include "../cpu/ports.h"
#include "../cpu/isr.h"
#include "screen.h"
#include "../libc/string.h"
#include "../libc/function.h"
#include "../kernel/kernel.h"
#define BACKSPACE 0x0E
#define ENTER 0x1C
static char key_buffer[256];
#define SC_MAX 57
const char *sc_name[] = { "ERROR", "Esc", "1", "2", "3", "4", "5", "6",
"7", "8", "9", "0", "-", "=", "Backspace", "Tab", "Q", "W", "E",
"R", "T", "Y", "U", "I", "O", "P", "[", "]", "Enter", "Lctrl",
"A", "S", "D", "F", "G", "H", "J", "K", "L", ";", "'", "`",
"LShift", "\\", "Z", "X", "C", "V", "B", "N", "M", ",", ".",
"/", "RShift", "Keypad *", "LAlt", "Spacebar"};
const char sc_ascii[] = { '?', '?', '1', '2', '3', '4', '5', '6',
'7', '8', '9', '0', '-', '=', '?', '?', 'Q', 'W', 'E', 'R', 'T', 'Y',
'U', 'I', 'O', 'P', '[', ']', '?', '?', 'A', 'S', 'D', 'F', 'G',
'H', 'J', 'K', 'L', ';', '\'', '`', '?', '\\', 'Z', 'X', 'C', 'V',
'B', 'N', 'M', ',', '.', '/', '?', '?', '?', ' '};
static void keyboard_callback(registers_t regs) {
/* The PIC leaves us the scancode in port 0x60 */
u8 scancode = port_byte_in(0x60);
if (scancode > SC_MAX) return;
if (scancode == BACKSPACE) {
backspace(key_buffer);
kprint_backspace();
} else if (scancode == ENTER) {
kprint("\n");
user_input(key_buffer); /* kernel-controlled function */
key_buffer[0] = '\0';
} else {
char letter = sc_ascii[(int)scancode];
/* Remember that kprint only accepts char[] */
char str[2] = {letter, '\0'};
append(key_buffer, letter);
kprint(str);
}
UNUSED(regs);
}
void init_keyboard() {
register_interrupt_handler(IRQ1, keyboard_callback);
}