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#include <timer.h>
#include <libk/stdio.h>
#include <heap.h>
#include <libk/list.h>
#include <io.h>
#include <idt.h>
#include <process.h>
#include <scheduler.h>
uint32_t scheduler_ticks = 0;
uint32_t seconds_tick = 0;
uint32_t seconds = 0;
struct wait_queue {
int64_t ticks;
list_t list;
};
typedef struct wait_queue wait_queue;
wait_queue timer_queue;
void timer_handler(uint64_t rsp)
{
wait_queue *pos;
list_for_each_entry(pos, (&timer_queue.list), list) {
pos->ticks--;
}
seconds_tick++;
if (seconds_tick >= TICKS_PER_SECOND) {
seconds_tick = 0;
seconds++;
}
scheduler_ticks++;
if (scheduler_ticks >= TICKS_PER_SECOND / CONTEXT_SWITCHES_PER_SECOND) {
scheduler_ticks = 0;
if (sched_init) {
context_switch(rsp);
}
}
}
void wait(uint64_t ms)
{
disable_interrupts();
wait_queue *queue = (wait_queue *)kalloc(sizeof(wait_queue));
queue->ticks = (int64_t)ms;
add_to_list(&queue->list, &timer_queue.list, timer_queue.list.next);
enable_interrupts();
while (queue->ticks > 0)
;
kfree(queue);
free_node(&queue->list);
}
void init_timer(uint32_t frequency)
{
INIT_LIST(timer_queue.list);
uint32_t divisor = 1193180 / frequency;
outb(0x43, 0x36);
uint8_t l = (uint8_t)(divisor & 0xFF);
uint8_t h = (uint8_t)((divisor >> 8) & 0xFF);
outb(0x40, l);
outb(0x40, h);
}
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