interrupts.h File Reference

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Functions
void	init_irq (void)
void	init_pic (void)

Function Documentation

void init_irq

(

void

)

Definition at line 68 of file interrupts.c.

References bounds(), breakpoint(), coprocessor(), coprocessor_segment(), debug(), device_not_available(), divide_error(), double_fault(), general_protection(), idt_set_gate(), invalid_op(), invalid_tss(), nmi(), overflow(), page_fault(), reserved(), rtc_isr(), segment_not_present(), stack_segment(), and sys_call_isr().

Referenced by kmain().

{  
  int i;

  // Necessary interrupt handlers for protected mode
  u32int isrs[17] = {
    (u32int)divide_error,
    (u32int)debug,
    (u32int)nmi,
    (u32int)breakpoint,
    (u32int)overflow,
    (u32int)bounds,
    (u32int)invalid_op,
    (u32int)device_not_available,
    (u32int)double_fault,
    (u32int)coprocessor_segment,
    (u32int)invalid_tss,
    (u32int)segment_not_present,
    (u32int)stack_segment,
    (u32int)general_protection,
    (u32int)page_fault,
    (u32int)reserved,
    (u32int)coprocessor
  };

  // Install handlers; 0x08=sel, 0x8e=flags
  for(i=0; i<32; i++){
    if (i<17) idt_set_gate(i, isrs[i], 0x08, 0x8e);
    else idt_set_gate(i, (u32int)reserved, 0x08, 0x8e);
  }
  // Ignore interrupts from the real time clock
  idt_set_gate(0x08, (u32int)rtc_isr, 0x08, 0x8e);
  idt_set_gate(60, (u32int)sys_call_isr, 0x08, 0x8e);
}

void init_pic

(

void

)

Definition at line 109 of file interrupts.c.

References ICW1, ICW4, io_wait, outb, PIC1, and PIC2.

Referenced by kmain().

{
  outb(PIC1,ICW1);   //send initialization code words 1 to PIC1
  io_wait();
  outb(PIC2,ICW1);   //send icw1 to PIC2
  io_wait();
  outb(PIC1+1,0x20); //icw2: remap irq0 to 32
  io_wait();
  outb(PIC2+1,0x28); //icw2: remap irq8 to 40
  io_wait();
  outb(PIC1+1,4);    //icw3
  io_wait();
  outb(PIC2+1,2);    //icw3
  io_wait();
  outb(PIC1+1,ICW4); //icw4: 80x86, automatic handling
  io_wait();
  outb(PIC2+1,ICW4); //icw4: 80x86, automatic handling
  io_wait();
  outb(PIC1+1,0xFF); //disable irqs for PIC1
  io_wait();
  outb(PIC2+1,0xFF); //disable irqs for PIC2
}