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40 lines
858 B
C
40 lines
858 B
C
/* 键盘控制代码 */
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#include "bootpack.h"
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struct FIFO8 keyfifo;
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void inthandler21(int *esp) {
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/* 来自PS/2键盘的中断 */
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struct BOOTINFO *binfo = (struct BOOTINFO *) ADR_BOOTINFO;
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unsigned char data, s[4];
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io_out8(PIC0_OCW2, 0x61); /* 通知PIC IRQ-01 已经受理完毕 */
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data = io_in8(PORT_KEYDAT);
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fifo8_put(&keyfifo, data);
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return;
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}
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#define PORT_KEYSTA 0x0064
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#define KEYSTA_SEND_NOTREADY 0x02
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#define KEYCMD_WRITE_MODE 0x60
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#define KBC_MODE 0x47
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void wait_KBC_sendready(void) {
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/* 等待键盘控制电路准备完毕 */
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for (;;) {
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if ((io_in8(PORT_KEYSTA) & KEYSTA_SEND_NOTREADY) == 0) {
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break;
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}
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}
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return;
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}
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void init_keyboard(void) {
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/* 初始化键盘控制电路 */
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wait_KBC_sendready();
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io_out8(PORT_KEYCMD, KEYCMD_WRITE_MODE);
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wait_KBC_sendready();
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io_out8(PORT_KEYDAT, KBC_MODE);
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return;
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}
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