147 lines
3 KiB
C
147 lines
3 KiB
C
#include <kernel/tty.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <strlib.h>
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static inline uint8_t inb(uint16_t port)
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{
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uint8_t ret;
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__asm__ volatile ( "inb %w1, %b0"
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: "=a"(ret)
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: "Nd"(port)
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: "memory");
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return ret;
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}
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bool is_in_shift;
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static unsigned char keyboard_char(unsigned char scancode) {
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if (0x01 < scancode && scancode < 0x0B) {
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return scancode - 2 + '1';
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}
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if (scancode == 0x0B) {
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return '0';
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}
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switch (scancode) {
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case 0x10:
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return 'Q';
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case 0x11:
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return 'W';
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case 0x12:
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return 'E';
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case 0x13:
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return 'R';
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case 0x14:
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return 'T';
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case 0x15:
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return 'Y';
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case 0x16:
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return 'U';
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case 0x17:
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return 'I';
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case 0x18:
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return 'O';
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case 0x19:
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return 'P';
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case 0x1a:
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return '[';
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case 0x1b:
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return ']';
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case 0x1c:
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return '\n';
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case 0x1d:
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return '\b';
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case 0x1e:
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return 'A';
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case 0x1f:
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return 'S';
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case 0x20:
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return 'D';
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case 0x21:
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return 'F';
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case 0x22:
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return 'G';
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case 0x23:
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return 'H';
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case 0x24:
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return 'J';
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case 0x25:
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return 'K';
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case 0x26:
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return 'L';
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case 0x27:
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return ';';
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case 0x28:
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return '\'';
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case 0x29:
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return '`';
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case 0x2a:
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is_in_shift = true;
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break;
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case 0x2b:
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return '\\';
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case 0x2c:
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return 'Z';
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case 0x2d:
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return 'X';
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case 0x2e:
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return 'C';
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case 0x2f:
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return 'V';
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case 0x30:
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return 'B';
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case 0x31:
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return 'N';
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case 0x32:
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return 'M';
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case 0x33:
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return ',';
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case 0x34:
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return '.';
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case 0x35:
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return '/';
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case 0x36:
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is_in_shift = true;
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break;
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case 0x39:
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return ' ';
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case 0xaa:
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is_in_shift = false;
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break;
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case 0xb6:
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is_in_shift = false;
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break;
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}
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return -1;
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}
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char get_last_key_pressed() {
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char scancode = inb(0x60);
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if (is_in_shift) {
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return keyboard_char(scancode);
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}
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return to_lower_char(keyboard_char(scancode));
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}
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void print_hex_digit(uint8_t digit) {
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digit = digit & 0xf;
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if (digit < 0xA) {
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terminal_putchar(digit + 0x30);
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} else {
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terminal_putchar(digit + 0x41 - 0xA);
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}
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}
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void print_hex_byte(uint8_t byte) {
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int upper = byte >> 4;
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int lower = byte & 0x0F;
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print_hex_digit(upper);
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print_hex_digit(lower);
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}
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