Espresso/drivers/irq.c

#include <stdio.h>
#include <drivers/ps2_keyboard.h>
#include <drivers/pit.h>
#include <port_io.h>

#include <drivers/irq.h>

#define NUM_IRQS 0x90

irq_func_t func_list[NUM_IRQS];



static volatile uint32_t num_irqs_missed = 0;

void irq_init(void)
{
  for (int i = 0; i < NUM_IRQS; i++)
  {
    func_list[i] = 0x0;
  }
  set_irq_handler(0, (irq_func_t*)pit_handler);
  set_irq_handler(1, (irq_func_t*)keyboard_handler);
}

void irq_handler(uint8_t irq_number)
{
  if (irq_number < NUM_IRQS)
  {
    if (func_list[irq_number])
    {
      func_list[irq_number]();
      outb(0x20, 0x20); /* Acknowledge the IRQ to PIC */
    }
    else
    {
      num_irqs_missed++;
    }
  }
}

void set_irq_handler(uint32_t num, irq_func_t* handler)
{
  if (num < NUM_IRQS)
  {
    func_list[num] = (irq_func_t)handler;
  }
}