做个简单的多任务（2）

15_day/bootpack.c

@@ -123,6 +123,7 @@ void HariMain(void)
 	tss_b.ds = 1 * 8;
 	tss_b.fs = 1 * 8;
 	tss_b.gs = 1 * 8;
+	*((int *) 0x0fec) = (int) sht_back;
 
 	for (;;) {
 		io_cli();
@@ -285,16 +286,23 @@ void task_b_main(void)
 {
 	struct FIFO32 fifo;
 	struct TIMER *timer_ts;
-	int i, fifobuf[128];
+	int i, fifobuf[128], count = 0;
+	char s[11];
+	struct SHEET *sht_back;
+
 	fifo32_init(&fifo, 128, fifobuf);
 	timer_ts = timer_alloc();
 	timer_init(timer_ts, &fifo, 1);
 	timer_settime(timer_ts, 2);
+	sht_back = (struct SHEET *) *((int *) 0x0fec);
 
 	for (;;) {
+		count++;
+		sprintf(s, "%10d", count);
+		putfonts8_asc_sht(sht_back, 0, 144, COL8_FFFFFF, COL8_008484, s, 10);
 		io_cli();
 		if (fifo32_status(&fifo) == 0) {
-			io_stihlt();
+			io_sti();
 		} else {
 			i = fifo32_get(&fifo);
 			io_sti();