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#include <stdio.h>
#include <stdint.h>
#include <go32.h>
#include <dpmi.h>
volatile uint32_t ticks = 0;
volatile uint32_t clock = 0;
volatile uint8_t clock_secs = 0;
volatile uint8_t clock_enabled = 0;
volatile uint8_t *clock_updated = NULL;
static _go32_dpmi_seginfo old_handler, new_handler;
static void timer_handler()
{
ticks++;
if (clock_enabled)
{
clock += 5494;
if (clock > 100000)
{
clock -= 100000;
if (clock_secs)
{
clock_secs--;
if (clock_updated)
*clock_updated = 1;
}
}
}
}
void timer_init()
{
_go32_dpmi_get_protected_mode_interrupt_vector(0x1c, &old_handler);
new_handler.pm_offset = (unsigned long)timer_handler;
new_handler.pm_selector = _go32_my_cs();
_go32_dpmi_chain_protected_mode_interrupt_vector(0x1c, &new_handler);
}
void timer_free()
{
if (_go32_dpmi_set_protected_mode_interrupt_vector(0x1c, &old_handler) == -1)
fprintf(stderr, "Failed to free the timer :(\n");
}
void timer_start(uint8_t secs, uint8_t *updated)
{
*updated = 0;
clock_updated = updated;
clock_secs = secs;
clock_enabled = 1;
}
uint8_t timer_value()
{
*clock_updated = 0;
return clock_secs;
}
void timer_stop()
{
clock_enabled = 0;
}
void timer_resume()
{
clock_enabled = 1;
}
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