103 lines
2.0 KiB
C
103 lines
2.0 KiB
C
#include <stdio.h>
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#include "int.h"
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#include "io.h"
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#include "timer.h"
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struct TimerCtl timerctl;
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void init_pit(void) {
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io_out8(PIT_CTRL, 0x34);
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io_out8(PIT_CNT0, 0x9c);
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io_out8(PIT_CNT0, 0x2e);
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for (int i = 0; i < MAX_TIMER; i++) {
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timerctl.timers0[i].flags = 0;
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}
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struct Timer *t = timer_alloc();
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t->timeout = 0xffffffff;
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t->flags = TIMER_FLAGS_USING;
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t->next = NULL;
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timerctl.count = 0;
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timerctl.t0 = t;
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timerctl.next = 0xffffffff;
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}
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struct Timer *timer_alloc(void) {
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for (int i = 0; i < MAX_TIMER; i++) {
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if (timerctl.timers0[i].flags == 0) {
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timerctl.timers0[i].flags = TIMER_FLAGS_ALLOC;
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return &timerctl.timers0[i];
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}
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}
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return NULL;
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}
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void timer_free(struct Timer *timer) { timer->flags = 0; }
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void timer_init(struct Timer *timer, struct FIFO32 *fifo, int data) {
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timer->fifo = fifo;
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timer->data = data;
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}
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void timer_set_timer(struct Timer *timer, unsigned int timeout) {
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int eflags;
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struct Timer *t, *s;
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timer->timeout = timeout + timerctl.count;
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timer->flags = TIMER_FLAGS_USING;
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eflags = io_load_eflags();
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io_cli();
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t = timerctl.t0;
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if (timer->timeout <= t->timeout) {
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timerctl.t0 = timer;
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timer->next = t;
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timerctl.next = timer->timeout;
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io_store_eflags(eflags);
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return;
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}
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// 搜索插入未知
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for (;;) {
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s = t;
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t = t->next;
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if (timer->timeout <= t->timeout) {
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s->next = timer;
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timer->next = t;
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io_store_eflags(eflags);
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return;
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}
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}
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}
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void int_handler20(int *esp) {
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io_out8(PIC0_OCW2, 0x60); // 接收IRQ-00信号通知PIC
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timerctl.count++;
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if (timerctl.next > timerctl.count) {
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return;
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}
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struct Timer *timer = timerctl.t0;
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for (;;) {
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// timers的定时器都处于动作中，所以不确认flags
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if (timer->timeout > timerctl.count) {
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break;
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}
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// 超时
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timer->flags = TIMER_FLAGS_ALLOC;
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fifo32_put(timer->fifo, timer->data);
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timer = timer->next;
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}
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timerctl.t0 = timer;
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timerctl.next = timerctl.t0->timeout;
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}
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