102 lines
2.1 KiB
C
102 lines
2.1 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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timerctl.count = 0;
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timerctl.next = 0xffffffff;
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timerctl.using = 0;
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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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}
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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) {
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timer->flags = 0;
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}
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void timer_init(struct Timer *timer, struct FIFO8 *fifo, unsigned char 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, i, j;
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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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for (i = 0; i < timerctl.using; i++) {
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if (timerctl.timers[i]->timeout >= timer->timeout) {
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break;
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}
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}
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// i后全部后移一位
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for (j = timerctl.using; j > i; j--) {
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timerctl.timers[j] = timerctl.timers[j - 1];
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}
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timerctl.using++;
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// 插入到空位上
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timerctl.timers[i] = timer;
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timerctl.next = timerctl.timers[0]->timeout;
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io_store_eflags(eflags);
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}
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void int_handler20(int *esp) {
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int i, j;
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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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for (i = 0; i < timerctl.using; i++) {
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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 (timerctl.timers[i]->timeout > timerctl.count) {
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break;
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}
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// 超时
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timerctl.timers[i]->flags = TIMER_FLAGS_ALLOC;
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fifo8_put(timerctl.timers[i]->fifo, timerctl.timers[i]->data);
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}
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// 正好有i个定时器超时了，其余的进行移位
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timerctl.using -= i;
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for (j = 0; j < timerctl.using; j++) {
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timerctl.timers[j] = timerctl.timers[i + j];
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}
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if (timerctl.using > 0) {
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timerctl.next = timerctl.timers[0]->timeout;
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} else {
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timerctl.next = 0xffffffff;
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}
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}
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