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加快中断处理（3）

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Yourtion
2016-04-19 11:41:29 +08:00
parent a1142b3a5f
commit c4f1c13129
2 changed files with 43 additions and 22 deletions
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5
12_day/bootpack.h
View File

@@ -176,8 +176,9 @@ struct TIMER {
unsigned char data;
};
struct TIMERCTL {
unsigned int count, next;
struct TIMER timer[MAX_TIMER];
unsigned int count, next, using;
struct TIMER *timers[MAX_TIMER];
struct TIMER timers0[MAX_TIMER];
};
extern struct TIMERCTL timerctl;

60
12_day/timer.c
View File

@@ -17,8 +17,9 @@ void init_pit(void)
io_out8(PIT_CNT0, 0x2e);
timerctl.count = 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.timer[i].flags = 0; /* 未使用 */
timerctl.timers0[i].flags = 0; /* 未使用 */
}
return;
}
@@ -27,9 +28,9 @@ struct TIMER *timer_alloc(void)
{
int i;
for (i = 0; i < MAX_TIMER; i++) {
if (timerctl.timer[i].flags == 0) {
timerctl.timer[i].flags = TIMER_FLAGS_ALLOC;
return &timerctl.timer[i];
if (timerctl.timers0[i].flags == 0) {
timerctl.timers0[i].flags = TIMER_FLAGS_ALLOC;
return &timerctl.timers0[i];
}
}
return 0; /* 没找到 */
@@ -50,37 +51,56 @@ void timer_init(struct TIMER *timer, struct FIFO8 *fifo, unsigned char data)
void timer_settime(struct TIMER *timer, unsigned int timeout)
{
int e, i, j;
timer->timeout = timeout + timerctl.count;
timer->flags = TIMER_FLAGS_USING;
if (timerctl.next > timer->timeout) {
/* 更新下一次的时刻 */
timerctl.next = timer->timeout;
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;
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.next > timerctl.count) {
return; /* 还不到下一个时刻，所以结束*/
}
timerctl.next = 0xffffffff;
for (i = 0; i < MAX_TIMER; i++) {
if (timerctl.timer[i].flags == TIMER_FLAGS_USING) {
if (timerctl.timer[i].timeout <= timerctl.count) {
/* 超时 */
timerctl.timer[i].flags = TIMER_FLAGS_ALLOC;
fifo8_put(timerctl.timer[i].fifo, timerctl.timer[i].data);
}
} else {
/* 还没有超时 */
if (timerctl.next > timerctl.timer[i].timeout) {
timerctl.next = timerctl.timer[i].timeout;
}
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;
}