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#include <kernel/interrupts/interrupts.h>
#include <kernel/io/io.h>
#include <kernel/graphics/vesa.h>
int shift_pressed;
char keymap[128] = {
0 /*E*/, 27, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', '\b',
'\t', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', '\n',
0 /*C*/, 'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'', '`', 14 /*LS*/,
'\\', 'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/', 14 /*RS*/, '*',
0, // Alt key
' ', // Space bar
15, // Caps lock
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // F keys
0, // Num lock
0, // Scroll lock
0, // Home key
0, // Up arrow
0, // Page up
'-',
0, // Left arrow
0,
0, // Right arrow
'+',
0, // End key
0, // Down arrow
0, // Page down
0, // Insert key
0, // Delete key
0, 0, 0,
0, // F11
0, // F12
0, // Other keys
};
char shift_keymap[128] = {
0 /*E*/, 27, '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+', '\b',
'\t', 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', '\n',
0 /*C*/, 'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"', '~', 14 /*LS*/,
'|', 'Z', 'X', 'C', 'V', 'B', 'N', 'M', '<', '>', '?', 14 /*RS*/, '*',
0, // Alt key
' ', // Space bar
15, // Caps lock
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // F keys
0, // Num lock
0, // Scroll lock
0, // Home key
0, // Up arrow
0, // Page up
'-',
0, // Left arrow
0,
0, // Right arrow
'+',
0, // End key
0, // Down arrow
0, // Page down
0, // Insert key
0, // Delete key
0, 0, 0,
0, // F11
0, // F12
0, // Other keys
};
void keyboard_handler(struct regs *r) {
unsigned char scan_code;
char *current_keymap = keymap;
if (shift_pressed) current_keymap = shift_keymap;
scan_code = receive_b(0x60);
if ((scan_code & 0x80) == 0) { // PRESS
// TODO: Fix caps lock deactivation when pressing shift while shifted
if (current_keymap[scan_code] == 14 || (current_keymap[scan_code] == 15 && !shift_pressed)) {
shift_pressed = 1;
return;
} else if (current_keymap[scan_code] == 15 && shift_pressed) {
shift_pressed = 0;
return;
}
vesa_keyboard_char(current_keymap[scan_code]);
} else { // RELEASE
char key = current_keymap[scan_code];
if (key == 14) shift_pressed = 0;
}
}
void keyboard_acknowledge() {
while (receive_b(0x60) != 0xfa);
}
void keyboard_rate() {
send_b(0x60, 0xF3);
keyboard_acknowledge();
send_b(0x60, 0x0); // Rate{00000} Delay{00} 0
}
// Installs the keyboard handler into IRQ1
void keyboard_install() {
keyboard_rate();
irq_install_handler(1, keyboard_handler);
shift_pressed = 0;
info("Installed keyboard handler");
}
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