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50 lines
1.7 KiB
50 lines
1.7 KiB
#include "keyboard.h"
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#include "../cpu/ports.h"
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#include "../cpu/isr.h"
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#include "screen.h"
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#include "../libc/string.h"
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#include "../kernel/kernel.h"
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#define BACKSPACE 0x0E
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#define ENTER 0x1C
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static char key_buffer[256];
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#define SC_MAX 57
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const char *sc_name[] = { "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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const char sc_ascii[] = { '?', '?', '1', '2', '3', '4', '5', '6',
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'7', '8', '9', '0', '-', '=', '?', '?', 'Q', 'W', 'E', 'R', 'T', 'Y',
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'U', 'I', 'O', 'P', '[', ']', '?', '?', 'A', 'S', 'D', 'F', 'G',
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'H', 'J', 'K', 'L', ';', '\'', '`', '?', '\\', 'Z', 'X', 'C', 'V',
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'B', 'N', 'M', ',', '.', '/', '?', '?', '?', ' '};
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static void keyboard_callback() {
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/* The PIC leaves us the scancode in port 0x60 */
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u8 scancode = port_byte_in(0x60);
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if (scancode > SC_MAX) return;
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if (scancode == BACKSPACE) {
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backspace(key_buffer);
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kprint_backspace();
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} else if (scancode == ENTER) {
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kprint("\n");
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user_input(key_buffer); /* kernel-controlled function */
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key_buffer[0] = '\0';
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} else {
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char letter = sc_ascii[(int)scancode];
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/* Remember that kprint only accepts char[] */
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char str[2] = {letter, '\0'};
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append(key_buffer, letter);
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kprint(str);
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}
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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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}
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