91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
#include <stdio.h>
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#include <port_io.h>
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#include <tty.h>
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#include <drivers/ps2_keyboard.h>
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/*
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PS/2 Controller IO Ports
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The PS/2 Controller itself uses 2 IO ports (IO ports 0x60 and 0x64). Like many IO ports, reads and writes may access different internal registers.
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Historical note: The PC-XT PPI had used port 0x61 to reset the keyboard interrupt request signal (among other unrelated functions). Port 0x61 has no keyboard related functions on AT and PS/2 compatibles.
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IO Port Access Type Purpose
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0x60 Read/Write Data Port
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0x64 Read Status Register
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0x64 Write Command Register
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*/
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/*
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Note:
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The interrupt number for keyboard input in 1.
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*/
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#define PS2_DATA_PORT 0x60
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#define PS2_STATUS_PORT 0x64
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#define KEYBOARD_IRQ 1
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/* State for shift key */
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static bool shift_pressed = false;
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static const char scancode_map[128] = {
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0, 27, '1','2','3','4','5','6','7','8','9','0','-','=','\b', /* Backspace */
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'\t', // Tab
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'q','w','e','r','t','y','u','i','o','p','[',']','\n', /* Enter */
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0, /* Control */
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'a','s','d','f','g','h','j','k','l',';','\'','`',
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0, /* Left shift */
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'\\','z','x','c','v','b','n','m',',','.','/',
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0, /* Right shift */
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'*',
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0, /* Alt */
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' ', /* Spacebar */
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0, /* Caps lock */
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/* The rest are function and control keys */
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};
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void keyboard_init(void)
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{
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outb(0x64, 0xAE); /* Enable keyboard interface (often optional, but here for safety) */
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}
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void keyboard_handler(void) {
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uint8_t scancode = inb(PS2_DATA_PORT);
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/* Handle shift press/release */
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if (scancode == 0x2A || scancode == 0x36)
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{
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shift_pressed = true;
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return;
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}
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else if (scancode == 0xAA || scancode == 0xB6)
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{
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shift_pressed = false;
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return;
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}
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if (scancode & 0x80)
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{
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/* Key release event, ignore for now */
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} else
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{
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char c = scancode_map[scancode];
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if (shift_pressed && c >= 'a' && c <= 'z') {
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c -= 32; /* Convert to uppercase */
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}
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else if (shift_pressed)
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{
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c = (char) terminal_get_shifted((unsigned char) c);
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}
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if (c)
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{
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printf("%c", c);
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}
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}
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}
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