30dayMakeOS/14_day/keyboard.c

/* 键盘控制代码 */

#include "bootpack.h"

struct FIFO32 *keyfifo;
int keydata0;

void inthandler21(int *esp)
{
	int data;
	io_out8(PIC0_OCW2, 0x61); /* 把IRQ-01接收信号结束的信息通知给PIC */
	data = io_in8(PORT_KEYDAT);
	fifo32_put(keyfifo, data + keydata0);
	return;
}

#define PORT_KEYSTA						0x0064
#define KEYSTA_SEND_NOTREADY	0x02
#define KEYCMD_WRITE_MODE			0x60
#define KBC_MODE							0x47

void wait_KBC_sendready(void) 
{
	/* 等待键盘控制电路准备完毕 */
	for (;;) {
		if ((io_in8(PORT_KEYSTA) & KEYSTA_SEND_NOTREADY) == 0) {
			break;
		}
	}
	return;
}

void init_keyboard(struct FIFO32 *fifo, int data0)
{
	/* 将FIFO缓冲区的信息保存到全局变量里 */
	keyfifo = fifo;
	keydata0 = data0;
	/* 键盘控制器的初始化 */
	wait_KBC_sendready();
	io_out8(PORT_KEYCMD, KEYCMD_WRITE_MODE);
	wait_KBC_sendready();
	io_out8(PORT_KEYDAT, KBC_MODE);
	return;
}