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加快中断处理（4）

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Yourtion
2016-04-20 14:26:18 +08:00
parent 5204ca9f32
commit dab5bd893a
2 changed files with 50 additions and 23 deletions
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3
13_day/bootpack.h
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@@ -169,13 +169,14 @@ void sheet_free(struct SHEET *sht);
/* timer.c */
#define MAX_TIMER 500
struct TIMER {
struct TIMER *next;
unsigned int timeout, flags;
struct FIFO32 *fifo;
int data;
};
struct TIMERCTL {
unsigned int count, next, using;
struct TIMER *timers[MAX_TIMER];
struct TIMER *t0;
struct TIMER timers0[MAX_TIMER];
};
extern struct TIMERCTL timerctl;

70
13_day/timer.c
View File

@@ -52,53 +52,79 @@ void timer_init(struct TIMER *timer, struct FIFO32 *fifo, int data)
void timer_settime(struct TIMER *timer, unsigned int timeout)
{
int e, i, j;
int e;
struct TIMER *t, *s;
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;
timerctl.using++;
if (timerctl.using == 1) {
/* 处于运行状态的定时器只有这一个时 */
timerctl.t0 = timer;
timer->next = 0; /* 没有下一个 */
timerctl.next = timer->timeout;
io_store_eflags(e);
return;
}
t = timerctl.t0;
if (timer->timeout <= t->timeout) {
/* 插入最前面的情况下 */
timerctl.t0 = timer;
timer->next = t; /* 下面是t */
timerctl.next = timer->timeout;
io_store_eflags(e);
return;
}
/* 搜寻插入位置 */
for (;;) {
s = t;
t = t->next;
if (t == 0) {
break; /* 最后面*/
}
if (timer->timeout <= t->timeout) {
/* 插入到s和t之间时 */
s->next = timer; /* s的下一个是timer */
timer->next = t; /* timer的下一个是t */
io_store_eflags(e);
return;
}
}
/* 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;
/* 插入最后面的情况下 */
s->next = timer;
timer->next = 0;
io_store_eflags(e);
return;
}
void inthandler20(int *esp)
{
int i, j;
int i;
struct TIMER *timer;
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.next > timerctl.count) {
return; /* 还不到下一个时刻，所以结束*/
}
timer = timerctl.t0; /* 首先把最前面的地址赋给timer */
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) {
/* 因为timers的定时器都处于运行状态，所以不确认flags */
if (timer->timeout > timerctl.count) {
break;
}
/* 超时*/
timerctl.timers[i]->flags = TIMER_FLAGS_ALLOC;
fifo32_put(timerctl.timers[i]->fifo, timerctl.timers[i]->data);
timer->flags = TIMER_FLAGS_ALLOC;
fifo32_put(timer->fifo, timer->data);
timer = timer->next; /* 下一定时器的地址赋给timer */
}
/* 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];
}
/* 新移位 */
timerctl.t0 = timer;
/* timerctl.next的设定 */
if (timerctl.using > 0) {
timerctl.next = timerctl.timers[0]->timeout;
timerctl.next = timerctl.t0->timeout;
} else {
timerctl.next = 0xffffffff;
}