//
// isr.c -- High level interrupt service routines and interrupt request handlers.
//          Part of this code is modified from Bran's kernel development tutorials.
//          Rewritten for JamesM's kernel development tutorials.
//

#include "headers/common.h"
#include "headers/isr.h"
#include "headers/screen.h"
#include <stdint.h>

isr_t interrupt_handlers[256];


// This gets called from our ASM interrupt handler stub.
void isr_handler(registers_t *regs)
{
   //kprintf("recieved interrupt: %d\n",regs->int_no);

   if(interrupt_handlers[regs->int_no] != 0)
   {
       isr_t handler = interrupt_handlers[regs->int_no];
       handler(regs);
   }
}

void irq_handler(registers_t *regs)
{
	 //kprintf("recieved irq: %d\n",regs->int_no);
    // send an EOI signal to pics if this 
    // interrupt involved the slave
    if(regs->int_no >= 40)
    {
         outb(0xA0,0x20);
    }
    // send reset siginal to master. (as well as slave, if neccessary).
    outb(0x20,0x20);

    if(interrupt_handlers[regs->int_no] != 0)
    {
         isr_t handler = interrupt_handlers[regs->int_no];
         handler(regs);
    }
}


void register_interrupt_handler(uint8_t n, isr_t handler)
{
    interrupt_handlers[n] = handler;
}