加快中断处理（3）

12_day/bootpack.c

@@ -8,8 +8,9 @@ void make_window8(unsigned char *buf, int xsize, int ysize, char *title);
 void HariMain(void)
 {
 	struct BOOTINFO *binfo = (struct BOOTINFO *) ADR_BOOTINFO;
-	struct FIFO8 timerfifo;
-	char s[40], keybuf[32], mousebuf[128], timerbuf[8];
+	struct FIFO8 timerfifo, timerfifo2, timerfifo3;
+	char s[40], keybuf[32], mousebuf[128], timerbuf[8], timerbuf2[8], timerbuf3[8];
+	struct TIMER *timer, *timer2, *timer3;
 	int mx, my, i;
 	unsigned int memtotal;
 	struct MOUSE_DEC mdec;
@@ -28,8 +29,17 @@ void HariMain(void)
 	io_out8(PIC1_IMR, 0xef); /* 开放鼠标中断(11101111) */
 
 	fifo8_init(&timerfifo, 8, timerbuf);
-	settimer(1000, &timerfifo, 1);
-
+	timer = timer_alloc();
+	timer_init(timer, &timerfifo, 1);
+	timer_settime(timer, 1000);
+	fifo8_init(&timerfifo2, 8, timerbuf2);
+	timer2 = timer_alloc();
+	timer_init(timer2, &timerfifo2, 1);
+	timer_settime(timer2, 300);
+	fifo8_init(&timerfifo3, 8, timerbuf3);
+	timer3 = timer_alloc();
+	timer_init(timer3, &timerfifo3, 1);
+	timer_settime(timer3, 50);
 
 	init_keyboard();
 	enable_mouse(&mdec);
@@ -72,7 +82,7 @@ void HariMain(void)
 		sheet_refresh(sht_win, 40, 28, 120, 44); /* 到这里结束 */
 
 		io_cli();
-		if (fifo8_status(&keyfifo) + fifo8_status(&mousefifo) + fifo8_status(&timerfifo) == 0) {
+		if (fifo8_status(&keyfifo) + fifo8_status(&mousefifo) + fifo8_status(&timerfifo) + fifo8_status(&timerfifo2) + fifo8_status(&timerfifo3)== 0) {
 			io_sti(); /* 不做HLT */
 		} else {
 			if (fifo8_status(&keyfifo) != 0) {
@@ -126,6 +136,23 @@ void HariMain(void)
 				io_sti();
 				putfonts8_asc(buf_back, binfo->scrnx, 0, 64, COL8_FFFFFF, "10[sec]");
 				sheet_refresh(sht_back, 0, 64, 56, 80);
+			} else if (fifo8_status(&timerfifo2) != 0) {
+				i = fifo8_get(&timerfifo2); /* 首先读入（为了设定起始点） */
+				io_sti();
+				putfonts8_asc(buf_back, binfo->scrnx, 0, 80, COL8_FFFFFF, "3[sec]");
+				sheet_refresh(sht_back, 0, 80, 48, 96);
+			} else if (fifo8_status(&timerfifo3) != 0) {
+				i = fifo8_get(&timerfifo3); /* 首先读入（为了设定起始点） */
+				io_sti();
+				if (i != 0) {
+					timer_init(timer3, &timerfifo3, 0); /* 然后设置0 */
+					boxfill8(buf_back, binfo->scrnx, COL8_FFFFFF, 8, 96, 15, 111);
+				} else {
+					timer_init(timer3, &timerfifo3, 1); /* 然后设置1 */
+					boxfill8(buf_back, binfo->scrnx, COL8_008484, 8, 96, 15, 111);
+				}
+				timer_settime(timer3, 50);
+				sheet_refresh(sht_back, 8, 96, 16, 112);
 			}
 		}
 	}

12_day/bootpack.h

@@ -169,14 +169,23 @@ void sheet_slide(struct SHEET *sht, int vx0, int vy0);
 void sheet_free(struct SHEET *sht);
 
 /* timer.c */
-struct TIMERCTL {
-	unsigned int count;
-	unsigned int timeout;
+#define MAX_TIMER 500
+struct TIMER {
+	unsigned int timeout, flags;
 	struct FIFO8 *fifo;
 	unsigned char data;
 };
+struct TIMERCTL {
+	unsigned int count, next, using;
+	struct TIMER *timers[MAX_TIMER];
+	struct TIMER timers0[MAX_TIMER];
+};
 extern struct TIMERCTL timerctl;
 
 void init_pit(void);
+struct TIMER *timer_alloc(void);
+void timer_free(struct TIMER *timer);
+void timer_init(struct TIMER *timer, struct FIFO8 *fifo, unsigned char data);
+void timer_settime(struct TIMER *timer, unsigned int timeout);
 void inthandler20(int *esp);
-void settimer(unsigned int timeout, struct FIFO8 *fifo, unsigned char data);
+

12_day/timer.c

@@ -4,40 +4,103 @@
 
 #define PIT_CTRL 0x0043
 #define PIT_CNT0 0x0040
+#define TIMER_FLAGS_ALLOC 1 /* 已配置状态 */
+#define TIMER_FLAGS_USING 2 /* 定时器运行中 */
 
 struct TIMERCTL timerctl;
 
 void init_pit(void)
 {
+	int i;
 	io_out8(PIT_CTRL, 0x34);
 	io_out8(PIT_CNT0, 0x9c);
 	io_out8(PIT_CNT0, 0x2e);
 	timerctl.count = 0;
-	timerctl.timeout = 0;
+	timerctl.next = 0xffffffff; /* 因为最初没有正在运行的定时器 */
+	timerctl.using = 0;
+	for (i = 0; i < MAX_TIMER; i++) {
+	timerctl.timers0[i].flags = 0; /* 未使用 */
+	}
+	return;
+}
+
+struct TIMER *timer_alloc(void)
+{
+	int i;
+	for (i = 0; i < MAX_TIMER; i++) {
+		if (timerctl.timers0[i].flags == 0) {
+			timerctl.timers0[i].flags = TIMER_FLAGS_ALLOC;
+			return &timerctl.timers0[i];
+		}
+	}
+	return 0; /* 没找到 */
+}
+
+void timer_free(struct TIMER *timer)
+{
+	timer->flags = 0; /* 未使用 */
+	return;
+}
+
+void timer_init(struct TIMER *timer, struct FIFO8 *fifo, unsigned char data)
+{
+	timer->fifo = fifo;
+	timer->data = data;
+	return;
+}
+
+void timer_settime(struct TIMER *timer, unsigned int timeout)
+{
+	int e, i, j;
+	timer->timeout = timeout + timerctl.count;
+	timer->flags = TIMER_FLAGS_USING;
+	e = io_load_eflags();
+	io_cli();
+	/* 搜索注册位置 */
+	for (i = 0; i < timerctl.using; i++) {
+		if (timerctl.timers[i]->timeout >= timer->timeout) {
+			break;
+		}
+	}
+	/* i号之后全部后移一位 */
+	for (j = timerctl.using; j > i; j--) {
+		timerctl.timers[j] = timerctl.timers[j - 1];
+	}
+	timerctl.using++;
+	/* 插入到空位上 */
+	timerctl.timers[i] = timer;
+	timerctl.next = timerctl.timers[0]->timeout;
+	io_store_eflags(e);
 	return;
 }
 
 void inthandler20(int *esp)
 {
+	int i, j;
 	io_out8(PIC0_OCW2, 0x60); /* 把IRQ-00信号接收完了的信息通知给PIC */
 	timerctl.count++;
-	if (timerctl.timeout > 0) { /* 如果已经设定了超时 */
-		timerctl.timeout--;
-		if (timerctl.timeout == 0) {
-			fifo8_put(timerctl.fifo, timerctl.data);
+	if (timerctl.next > timerctl.count) {
+		return; /* 还不到下一个时刻，所以结束*/
+	}
+	timerctl.next = 0xffffffff;
+	for (i = 0; i < timerctl.using; i++) {
+		/* timers的定时器都处于动作中，所以不确认flags */
+		if (timerctl.timers[i]->timeout > timerctl.count) {
+			break;
 		}
+		/* 超时*/
+		timerctl.timers[i]->flags = TIMER_FLAGS_ALLOC;
+		fifo8_put(timerctl.timers[i]->fifo, timerctl.timers[i]->data);
+	}
+	/* 正好有i个定时器超时了。其余的进行移位。 */
+	timerctl.using -= i;
+	for (j = 0; j < timerctl.using; j++) {
+		timerctl.timers[j] = timerctl.timers[i + j];
+	}
+	if (timerctl.using > 0) {
+		timerctl.next = timerctl.timers[0]->timeout;
+	} else {
+		timerctl.next = 0xffffffff;
 	}
 	return;
 }
-
-void settimer(unsigned int timeout, struct FIFO8 *fifo, unsigned char data)
-{
-	int eflags;
-	eflags = io_load_eflags();
-	io_cli();
-	timerctl.timeout = timeout;
-	timerctl.fifo = fifo;
-	timerctl.data = data;
-	io_store_eflags(eflags);
-	return;
-}