102 lines
2.7 KiB
C
102 lines
2.7 KiB
C
#include <stdbool.h>
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#include <drivers/pic/pic.h>
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#include <drivers/keyboard/keyboard.h>
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#include <drivers/device/device.h>
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unsigned char kbdbuf[KBD_BUF_SIZE];
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unsigned char kbdus[128] = {
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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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u8 lastkey = 0;
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u8 __kbd_enabled = 0;
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void keyboard_buffer_push_key(unsigned char scancode) {
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kbdbuf[lastkey++] = scancode;
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}
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unsigned char keyboard_buffer_pop_key() {
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u8 index = lastkey--;
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unsigned char scancode = kbdbuf[index];
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kbdbuf[index] = 0;
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return scancode;
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}
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unsigned char keyboard_get_key_from_scancode(unsigned char scancode) {
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return kbdus[scancode];
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}
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__attribute__((interrupt)) static void keyboard_irq(interrupt_frame_t *frame) {
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unsigned char scancode = inportb(0x60);
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if (scancode & 128) {
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// This is a release scancode, just ignore it
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pic_send_eoi(1);
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return;
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}
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keyboard_buffer_push_key(scancode);
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pic_send_eoi(1);
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}
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u8 keyboard_enabled(void) {
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return __kbd_enabled;
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}
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void* keyboard_read() {
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return (void*) keyboard_buffer_pop_key();
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}
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void* keyboard_write() {
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return -1;
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}
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int keyboard_init(void) {
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pic_irq_enable(1);
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idt_set_entry(33, (void*)keyboard_irq, INTERRUPT_GATE);
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__kbd_enabled = 1;
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struct device keyboard_device = {
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write: &keyboard_write,
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read: &keyboard_read
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};
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return push_device(keyboard_device);
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} |