pic.c File Reference

#include <types.h>
#include <errno.h>
#include <arch/x86/ioports.h>
#include "pic.h"

Go to the source code of this file.

Functions
int	pok_pic_init ()
int	pok_pic_mask (uint8_t irq)
int	pok_pic_unmask (uint8_t irq)
void	pok_pic_eoi (uint8_t irq)

---

Function Documentation

void pok_pic_eoi

(

uint8_t

irq

)

Definition at line 90 of file pic.c.

{
   if (irq >= 8)
   {
      outb (PIC_SLAVE_BASE, 0x20);
   }

   outb (PIC_MASTER_BASE, 0x20);
}

int pok_pic_init

(

)

Definition at line 25 of file pic.c.

{
   outb (PIC_MASTER_BASE, PIC_MASTER_ICW1);
   outb (PIC_SLAVE_BASE, PIC_SLAVE_ICW1);

   outb (PIC_MASTER_BASE + 1, PIC_MASTER_ICW2);
   outb (PIC_SLAVE_BASE + 1, PIC_SLAVE_ICW2);

   outb (PIC_MASTER_BASE + 1, PIC_MASTER_ICW3);
   outb (PIC_SLAVE_BASE + 1, PIC_SLAVE_ICW3);

   outb (PIC_MASTER_BASE + 1, PIC_MASTER_ICW4);
   outb (PIC_SLAVE_BASE + 1, PIC_SLAVE_ICW4);

   /* Mask everything */
   outb (PIC_MASTER_BASE + 1, 0xfb);
   outb (PIC_SLAVE_BASE + 1, 0xff);

   return (POK_ERRNO_OK);
}

int pok_pic_mask

(

uint8_t

irq

)

Definition at line 46 of file pic.c.

{
   uint8_t mask;

   if (irq > 15)
   {
      return (POK_ERRNO_EINVAL);
   }

   if (irq < 8)
   {
      mask = inb (PIC_MASTER_BASE + 1);
      outb (PIC_MASTER_BASE + 1, mask | (1 << irq));
   }
   else
   {
      mask = inb (PIC_SLAVE_BASE + 1);
      outb (PIC_SLAVE_BASE + 1, mask | (1 << (irq - 8)));
   }

   return (POK_ERRNO_OK);
}

int pok_pic_unmask

(

uint8_t

irq

)

Definition at line 69 of file pic.c.

{
   uint8_t mask;

   if (irq > 15)
      return (POK_ERRNO_EINVAL);

   if (irq < 8)
   {
      mask = inb(PIC_MASTER_BASE + 1);
      outb(PIC_MASTER_BASE + 1, mask & ~(1 << irq));
   }
   else
   {
      mask = inb(PIC_SLAVE_BASE + 1);
      outb(PIC_SLAVE_BASE + 1, mask & ~(1 << (irq - 8)));
   }

   return (POK_ERRNO_OK);
}