91 lines
1.7 KiB
C
91 lines
1.7 KiB
C
// A Tier0-mode keyboard driver... this is gonna get ignored when we het (some
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// day) into Tier1...
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#include "types.h"
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#include "Tier0/ps2.h"
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#include "Tier0/kstdio.h"
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#include "Tier0/interrupts.h"
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#include "Tier0/kbd_layout.h"
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#define PS2_KBD_IRQ
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#define PS2_KBD_DATA 0x60
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#define PS2_KEY_SHIFT 42
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#define PS2_KEY_DEPRESSED(x) ((x >= 128) ? 1 : 0)
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#define PS2_D_TO_P(x) (x - 128)
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#define PS2_P_TO_D(x) (x | 128)
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u8 ps2_special = 0;
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u8 ps2_key_pressed = 0;
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u8 ps2_key = 0;
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u8 ps2_key_new = 0;
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s8 ps2_getc(void)
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{
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while(1)
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{
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u8 Key = ps2_wait_key();
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s8 Character = kbd_layout_translate(Key, ps2_special);
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if (Character != 0)
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return Character;
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}
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}
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u8 ps2_poll_key(void)
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{
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if (ps2_key_pressed)
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return ps2_key;
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return 0;
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}
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u8 ps2_wait_key(void)
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{
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while(1)
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{
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if (ps2_key_pressed && ps2_key_new)
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break;
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}
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ps2_key_new = 0;
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return ps2_key;
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}
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void _ps2_keyboard_key_pressed(u8 Code)
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{
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if (Code == PS2_KEY_SHIFT)
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ps2_special |= PS2_SPECIAL_SHIFT;
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else// if (ps2_key_pressed == 0)
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{
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ps2_key_pressed = 1;
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ps2_key = Code;
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ps2_key_new = 1;
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}
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}
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void _ps2_keyboard_key_depressed(u8 Code)
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{
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if (Code == PS2_KEY_SHIFT)
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ps2_special &= ~PS2_SPECIAL_SHIFT;
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else if (Code == ps2_key)
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ps2_key_pressed = 0;
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}
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void ps2_keyboard_isr(void)
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{
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u8 ScanCode = kinb(PS2_KBD_DATA);
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if (PS2_KEY_DEPRESSED(ScanCode))
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_ps2_keyboard_key_depressed(PS2_D_TO_P(ScanCode));
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else
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_ps2_keyboard_key_pressed(ScanCode);
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interrupts_irq_finish(0x01);
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return;
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}
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void ps2_init_simple(void)
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{
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interrupts_setup_irq(0x01, ps2_keyboard_isr);
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}
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