142 lines
3.9 KiB
C
142 lines
3.9 KiB
C
//
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// Created by rick on 23-03-20.
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//
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#include <stdlib.h>
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#include <myke/drivers/keyboard.h>
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#include <myke/drivers/ports.h>
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#include <myke/cpu/isr.h>
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#include <myke/libc/ringqueue.h>
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#include <myke/libk/libk.h>
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#include <myke/libk/syscall.h>
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const char scancode_map_lowercase[] = {
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0, 0, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', 0, 0, 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i',
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'o', 'p', '[', ']', 0, 0, 'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'', '`', 0, '\\', 'z', 'x', 'c',
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'v', 'b', 'n', 'm', ',', '.', '/', 0, 0, 0, ' ', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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const char scancode_map_uppercase[] = {
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0, 0, '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+', 0, 0, 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I',
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'O', 'P', '{', '}', 0, 0, 'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"', '~', 0, '|', 'Z', 'X', 'C',
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'V', 'B', 'N', 'M', '<', '>', '?', 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0
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};
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struct {
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uint8_t shift: 1;
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uint8_t ctrl: 1;
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uint8_t alt: 1;
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uint8_t extended: 1;
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} keyboard_state;
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void *keyboard_event_buffer = NULL;
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char getc() {
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while (true) {
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KeyEvent *event = get_next_event();
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char retval = 0;
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if (event == NULL) {
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goto _getc_end_nofree;
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}
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if (event->is_release) {
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goto _getc_end;
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}
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if (event->scancode == 0x1C) {
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retval = '\n';
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goto _getc_end;
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}
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if (event->ascii_code != 0) {
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retval = event->ascii_code;
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goto _getc_end;
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}
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_getc_end:
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free_event(event);
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_getc_end_nofree:
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if (retval != 0) {
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return retval;
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}
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}
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}
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KeyEvent *get_next_event() {
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KeyEvent *target = malloc(sizeof(KeyEvent));
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if (!ring_buffer_get(keyboard_event_buffer, target)) {
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syscall_yield_irq(1 << 1);
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// k_wait_for_interrupt();
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free(target);
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return NULL;
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}
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return target;
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};
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void free_event(KeyEvent *event) {
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free(event);
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}
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//void print_scancode(unsigned char scancode);
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void handle_modifier_keys(unsigned char scancode, bool is_release) {
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switch (scancode) {
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case 42:
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case 54:
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keyboard_state.shift = !is_release;
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break;
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case 29:
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keyboard_state.ctrl = !is_release;
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break;
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case 56:
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keyboard_state.alt = !is_release;
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break;
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default:
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// not an modifier key
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break;
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}
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}
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void publish_key_event(unsigned char scan_code) {
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bool is_release = false;
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if (scan_code > 0x80) {
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is_release = true;
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scan_code -= 0x80;
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}
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handle_modifier_keys(scan_code, is_release);
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char ascii_char = scancode_map_lowercase[scan_code];
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if (keyboard_state.shift) {
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if (scancode_map_uppercase[scan_code] != 0) {
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ascii_char = scancode_map_uppercase[scan_code];
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}
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}
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KeyEvent event = {
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.scancode = scan_code,
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.ascii_code = ascii_char,
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.is_release = !is_release,
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.shift = keyboard_state.shift,
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.alt = keyboard_state.alt,
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.ctrl = keyboard_state.ctrl,
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};
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ring_buffer_put(keyboard_event_buffer, &event);
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}
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static void keyboard_callback(isr_registers_t *regs) {
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unsigned char status = port_byte_in(PORT_PS2_STATUS);
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// check if data available
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if ((status & 0b00000001) == 0) {
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return;
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}
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unsigned char scancode = port_byte_in(PORT_PS2_DATA);
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publish_key_event(scancode);
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}
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void init_keyboard() {
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register_interrupt_handler(IRQ1, keyboard_callback);
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keyboard_state.shift = 0;
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keyboard_state.ctrl = 0;
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keyboard_state.alt = 0;
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keyboard_state.extended = 0;
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keyboard_event_buffer = create_buffer(256, sizeof(KeyEvent));
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}
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