8259.c

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/*****************************************************************************************
 Copyright (c) 2002-2004 The UbixOS Project
 All rights reserved.

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 permitted provided that the following conditions are met:

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 conditions, the following disclaimer and the list of authors.  Redistributions in binary
 form must reproduce the above copyright notice, this list of conditions, the following
 disclaimer and the list of authors in the documentation and/or other materials provided
 with the distribution. Neither the name of the UbixOS Project nor the names of its
 contributors may be used to endorse or promote products derived from this software
 without specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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 OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 $Id: 8259_8c-source.html 88 2016-01-12 00:11:29Z reddawg $

*****************************************************************************************/

#include <isa/8259.h>
#include <sys/io.h>
#include <lib/kprintf.h>

static unsigned int irqMask = 0xFFFF;

int i8259_init() {
  outportByte(mPic,   icw1); /* Initialize Master PIC           */
  outportByte(sPic,   icw1); /* Initialize Seconary PIC         */
  outportByte(mPic+1, mVec); /* Master Interrup Vector          */
  outportByte(sPic+1, sVec); /* Secondary Interrupt Vector      */
  outportByte(mPic+1, 1<<2); /* Bitmask for cascade on IRQ 2    */
  outportByte(sPic+1, 2);    /* Cascade on IRQ 2                */
  outportByte(mPic+1, icw4); /* Finish Primary Initialization   */
  outportByte(sPic+1, icw4); /* Finish Seconary Initialization  */
  outportByte(mImr,   0xff); /* Mask All Primary Interrupts     */
  outportByte(sImr,   0xff); /* Mask All Seconary Interrupts    */

  /* Print out the system info for this */
  kprintf("pic0 - Port: [0x%X]\n",mPic);
  kprintf("pic1 - Port: [0x%X]\n",sPic);

  /* Return so the system knows it went well */
  return(0x0);
  }

void irqEnable(u_int16_t irqNo) {
  irqMask &= ~(1 << irqNo);
  if (irqNo >= 8) {
    irqMask &= ~(1 << 2);
    }
  outportByte(mPic+1, irqMask & 0xFF);
  outportByte(sPic+1, (irqMask >> 8) & 0xFF);
  }

void irqDisable(u_int16_t irqNo) {
  irqMask |= (1 << irqNo);
  if ((irqMask & 0xFF00)==0xFF00) {
    irqMask |= (1 << 2);
    }
  outportByte(mPic+1, irqMask & 0xFF);
  outportByte(sPic+1, (irqMask >> 8) & 0xFF);
  }

/***
 END
 ***/

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