149 lines
3.1 KiB
C
149 lines
3.1 KiB
C
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#include <types.h>
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#include <port_io.h>
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#include <new_tty.h>
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#include <stdio.h>
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#include <drivers/irq.h>
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#include <drivers/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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#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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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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volatile uint32_t mods = 0;
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volatile bool keyboard_initialied = false;
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volatile bool extended = false;
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int init_keyboard(void)
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{
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#ifdef _DEBUG
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printf("Initializing the keyboard...\n");
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#endif
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keyboard_initialied = true;
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set_irq_handler(1, (irq_func_t) keyboard_handler);
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#ifdef _DEBUG
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printf("Keyboard initialized\n");
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#endif
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return 0;
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}
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registers_t* keyboard_handler(registers_t* regs)
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{
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if (!(inb(PS2_STATUS_PORT) & 1))
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{
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return regs;
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}
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uint8_t scancode = inb(PS2_DATA_PORT);
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if (scancode & 0x80)
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{
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return regs;
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}
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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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mods |= MODIFIER_SHIFT;
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return regs;
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}
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else if (scancode == 0xAA || scancode == 0xB6)
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{
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mods &= MODIFIER_SHIFT_DESTROY;
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return regs;
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}
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else if (scancode == 0x3A)
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{
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TOGGLE_BIT(mods, 0); /* TOGGLE_BIT defined in types.h, should move elsewhere. */
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return regs;
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}
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/*else if (scancode == 0xE0)
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{
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extended = true;
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return;
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}*/
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/* XXX: NOTE: we don't do extended codes yet. :NOTE :XXX */
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/*if (extended)
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{*/
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/*switch (scancode)
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{
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case 0x48:
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c = KEY_ARROW_UP;
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break;
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case 0x50:
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c = KEY_ARROW_DOWN;
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break;
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case 0x4B:
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c = KEY_ARROW_LEFT;
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break;
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case 0x4D:
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c = KEY_ARROW_RIGHT;
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break;
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default:
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c = KEY_NONE;
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break;
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}*/
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/*tty_receive_char(c, mod);
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extended = false;
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return;
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}*/
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bool release = scancode & 0x80;
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scancode &= 0x7F;
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if (release)
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{
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return regs;
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}
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uint16_t c = (uint16_t) scancode_map[scancode];
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if (c)
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{
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//tty_receive_char(c, mods);
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char ch = tty_translate_char(c, mods);
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tty_input_char(tty_get_active(), ch);
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}
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return regs;
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}
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