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https://github.com/encounter/osdev.git
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Luke Street
72 lines
2.3 KiB
C
72 lines
2.3 KiB
C
#include "keyboard.h"
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#include "ports.h"
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#include "timer.h"
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#include "../console.h"
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#include "../isr.h"
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#include "../shell.h"
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#include <string.h>
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#define BACKSPACE 0x0E
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#define ENTER 0x1C
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#define L_SHIFT 0x2A
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#define R_SHIFT 0x36
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#define L_SHIFT_RELEASE 0xAA
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#define R_SHIFT_RELEASE 0xB6
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#define ARROW_UP 0x48
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#define ARROW_DOWN 0x50
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#define ASCII_MAX 58
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const char *sc_name[ASCII_MAX] = {
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"ERROR", "Esc", "1", "2", "3", "4", "5", "6",
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"7", "8", "9", "0", "-", "=", "Backspace", "Tab", "Q", "W", "E",
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"R", "T", "Y", "U", "I", "O", "P", "[", "]", "Enter", "Lctrl",
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"A", "S", "D", "F", "G", "H", "J", "K", "L", ";", "'", "`",
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"LShift", "\\", "Z", "X", "C", "V", "B", "N", "M", ",", ".",
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"/", "RShift", "Keypad *", "LAlt", "Spacebar"
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};
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const char sc_ascii[ASCII_MAX] = {
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0, 0, '!', '@', '#', '$', '%', '^',
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'&', '*', '(', ')', '_', '+', 0, 0, 'Q', 'W', 'E', 'R', 'T', 'Y',
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'U', 'I', 'O', 'P', '{', '}', 0, 0, 'A', 'S', 'D', 'F', 'G',
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'H', 'J', 'K', 'L', ':', '"', '~', 0, '\\', 'Z', 'X', 'C', 'V',
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'B', 'N', 'M', '<', '>', '?', 0, 0, 0, ' '
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};
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const char sc_ascii_lower[ASCII_MAX] = {
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0, 0, '1', '2', '3', '4', '5', '6',
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'7', '8', '9', '0', '-', '=', 0, 0, 'q', 'w', 'e', 'r', 't', 'y',
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'u', 'i', 'o', 'p', '[', ']', 0, 0, 'a', 's', 'd', 'f', 'g',
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'h', 'j', 'k', 'l', ';', '\'', '`', 0, '\\', 'z', 'x', 'c', 'v',
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'b', 'n', 'm', ',', '.', '/', 0, 0, 0, 0
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};
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static bool shift_pressed = false;
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static void irq_callback(_unused registers_t regs) {
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unsigned char c = port_byte_in(0x60);
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if (c == L_SHIFT || c == R_SHIFT) {
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shift_pressed = true;
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} else if (c == L_SHIFT_RELEASE || c == R_SHIFT_RELEASE) {
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shift_pressed = false;
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} else if (c == BACKSPACE) {
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key_buffer_backspace();
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} else if (c == ENTER) {
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key_buffer_return();
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} else if (c == ARROW_UP) {
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shell_handle_up();
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} else if (c == ARROW_DOWN) {
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shell_handle_down();
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}
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if (c > ASCII_MAX) {
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return;
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} else if (!shift_pressed && sc_ascii_lower[c]) {
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key_buffer_append(sc_ascii_lower[c]);
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} else if (sc_ascii[c]) {
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key_buffer_append(sc_ascii[c]);
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}
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}
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void init_keyboard() {
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register_interrupt_handler(IRQ1, &irq_callback);
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} |