2024-07-02 00:46:29 -04:00
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#include <kernel/kernel.h>
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2024-07-01 19:28:45 -04:00
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#include <kernel/pit.h>
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#include <kernel/io.h>
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#include <kernel/pic.h>
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2024-07-02 00:46:29 -04:00
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extern kernel_ctx_t ctx;
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2024-07-01 19:28:45 -04:00
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void pit_init(void) {
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2024-07-02 15:36:47 -04:00
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outb(PIT_MODE_CMD, PIT_CHAN0 | PIT_LOHIGH | PIT_MODE2);
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2024-07-01 19:28:45 -04:00
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2024-07-02 00:46:29 -04:00
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outb(PIT_CHAN0_DATA, (uint8_t)(DIVISOR & 0xff));
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2024-07-02 15:36:47 -04:00
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outb(PIT_CHAN0_DATA, (uint8_t)((DIVISOR & 0xff00) >> 8));
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2024-07-01 19:28:45 -04:00
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}
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2024-07-06 18:00:06 -04:00
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extern void task_switch(task_t *task);
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2024-07-07 23:42:44 -04:00
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int pit_handler(void) {
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2024-07-02 00:46:29 -04:00
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ctx.ticks++;
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outb(PIT_CHAN0_DATA, (uint8_t)(DIVISOR & 0xff));
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2024-07-02 15:36:47 -04:00
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outb(PIT_CHAN0_DATA, (uint8_t)((DIVISOR & 0xff00) >> 8));
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2024-07-01 19:28:45 -04:00
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pic_send_eoi(0);
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2024-07-07 23:42:44 -04:00
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if ((ctx.ticks % 3) == 0) return 1;
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else return 0;
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2024-07-01 19:28:45 -04:00
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}
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