143 lines
3.4 KiB
C
143 lines
3.4 KiB
C
#include "io.h"
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#include "../libc/stdio.h"
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#include "system.h"
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#define KEYBOARD_BUFFER_SIZE 256
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#define LEFT_SHIFT_PRESSED 0x2A
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#define RIGHT_SHIFT_PRESSED 0x36
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#define LEFT_SHIFT_RELEASED 0xAA
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#define RIGHT_SHIFT_RELEASED 0xB6
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unsigned char kbdus[128] =
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{
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0, 27, '1', '2', '3', '4', '5', '6', '7', '8', /* 9 */
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'9', '0', '-', '=', '\b', /* Backspace */
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'\t', /* Tab */
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'q', 'w', 'e', 'r', /* 19 */
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't', 'y', 'u', 'i', 'o', 'p', '[', ']', '\n', /* Enter key */
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0, /* 29 - Control */
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'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', /* 39 */
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'\'', '`', 0, /* Left shift */
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'\\', 'z', 'x', 'c', 'v', 'b', 'n', /* 49 */
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'm', ',', '.', '/', 0, /* Right shift */
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'*',
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0, /* Alt */
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' ', /* Space bar */
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0, /* Caps lock */
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0, /* 59 - F1 key ... > */
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0, 0, 0, 0, 0, 0, 0, 0,
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0, /* < ... F10 */
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0, /* 69 - Num lock*/
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0, /* Scroll Lock */
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0, /* Home key */
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0, /* Up Arrow */
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0, /* Page Up */
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'-',
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0, /* Left Arrow */
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0,
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0, /* Right Arrow */
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'+',
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0, /* 79 - End key*/
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0, /* Down Arrow */
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0, /* Page Down */
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0, /* Insert Key */
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0, /* Delete Key */
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0, 0, 0,
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0, /* F11 Key */
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0, /* F12 Key */
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0, /* All other keys are undefined */
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};
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unsigned char kbdus_shift[128] =
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{
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0, 27, '!', '@', '#', '$', '%', '^', '&', '*', /* 9 */
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'(', ')', '_', '+', '\b', /* Backspace */
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'\t', /* Tab */
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'Q', 'W', 'E', 'R', /* 19 */
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'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', '\n', /* Enter key */
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0, /* 29 - Control */
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'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', /* 39 */
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'"', '~', 0, /* Left shift */
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'|', 'Z', 'X', 'C', 'V', 'B', 'N', /* 49 */
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'M', '<', '>', '?', 0, /* Right shift */
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'*',
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0, /* Alt */
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' ', /* Space bar */
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0, /* Caps lock */
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0, /* 59 - F1 key ... > */
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0, 0, 0, 0, 0, 0, 0, 0,
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0, /* < ... F10 */
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0, /* 69 - Num lock*/
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0, /* Scroll Lock */
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0, /* Home key */
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0, /* Up Arrow */
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0, /* Page Up */
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'-',
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0, /* Left Arrow */
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0,
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0, /* Right Arrow */
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'+',
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0, /* 79 - End key*/
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0, /* Down Arrow */
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0, /* Page Down */
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0, /* Insert Key */
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0, /* Delete Key */
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0, 0, 0,
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0, /* F11 Key */
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0, /* F12 Key */
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0, /* All other keys are undefined */
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};
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static char keyboard_buffer[KEYBOARD_BUFFER_SIZE];
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static unsigned int keyboard_buffer_start = 0;
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static unsigned int keyboard_buffer_end = 0;
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static int shift_pressed = 0;
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void keyboard_handler()
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{
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unsigned char scancode;
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scancode = inb(0x60);
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if (scancode & 0x80)
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{
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if (scancode == LEFT_SHIFT_RELEASED || scancode == RIGHT_SHIFT_RELEASED) {
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shift_pressed = 0;
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}
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}
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else
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{
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if (scancode == LEFT_SHIFT_PRESSED || scancode == RIGHT_SHIFT_PRESSED) {
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shift_pressed = 1;
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} else {
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char c;
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if (shift_pressed) {
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c = kbdus_shift[scancode];
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} else {
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c = kbdus[scancode];
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}
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if (c)
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{
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keyboard_buffer[keyboard_buffer_end] = c;
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keyboard_buffer_end = (keyboard_buffer_end+1) % KEYBOARD_BUFFER_SIZE;
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}
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}
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}
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}
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void keyboard_install()
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{
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irq_install_handler(1, keyboard_handler);
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}
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char keyboard_getchar()
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{
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while (keyboard_buffer_start == keyboard_buffer_end);
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char c = keyboard_buffer[keyboard_buffer_start];
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keyboard_buffer_start = (keyboard_buffer_start+1) % KEYBOARD_BUFFER_SIZE;
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return c;
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}
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