Add 11 day code

11_day/keyboard.c

@@ -0,0 +1,39 @@
+/* 键盘控制代码 */
+
+#include "bootpack.h"
+
+struct FIFO8 keyfifo;
+
+void inthandler21(int *esp) {
+	/* 来自PS/2键盘的中断 */
+	struct BOOTINFO *binfo = (struct BOOTINFO *) ADR_BOOTINFO;
+	unsigned char data, s[4];
+	io_out8(PIC0_OCW2, 0x61);	/* 通知PIC IRQ-01 已经受理完毕 */
+	data = io_in8(PORT_KEYDAT);
+	fifo8_put(&keyfifo, data);
+	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(void) {
+	/* 初始化键盘控制电路 */
+	wait_KBC_sendready();
+	io_out8(PORT_KEYCMD, KEYCMD_WRITE_MODE);
+	wait_KBC_sendready();
+	io_out8(PORT_KEYDAT, KBC_MODE);
+	return;
+}