8259.c

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

 Redistribution and use in source and binary forms, with or without modification, are
 permitted provided that the following conditions are met:

 Redistributions of source code must retain the above copyright notice, this list of
 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.

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 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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 THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 $Id$

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

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

static unsigned int irqMask = 0xFFFF;

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

 Function: int 8259_init()

 Description: This function will initialize both PICs for all of our IRQs

 Notes:

************************************************************************/
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);
  }

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

 Function: int irqEnable()

 Description: This function is used to turn on an IRQ

 Notes:

************************************************************************/
void irqEnable(uInt16 irqNo) {
  irqMask &= ~(1 << irqNo);
  if (irqNo >= 8) {
    irqMask &= ~(1 << 2);
    }
  outportByte(mPic+1, irqMask & 0xFF);
  outportByte(sPic+1, (irqMask >> 8) & 0xFF);
  }

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

 Function: int irqDisable()

 Description: This function is used to turn off an IRQ

 Notes:

************************************************************************/
void irqDisable(uInt16 irqNo) {
  irqMask |= (1 << irqNo);
  if ((irqMask & 0xFF00)==0xFF00) {
    irqMask |= (1 << 2);
    }
  outportByte(mPic+1, irqMask & 0xFF);
  outportByte(sPic+1, (irqMask >> 8) & 0xFF);
  }

/***
 $Log$
 Revision 1.1.1.1  2006/06/01 12:46:12  reddawg
 ubix2

 Revision 1.2  2005/10/12 00:13:37  reddawg
 Removed

 Revision 1.1.1.1  2005/09/26 17:23:59  reddawg
 no message

 Revision 1.5  2004/07/09 13:20:08  reddawg
 Oh yeah duh you can not name functions with numbers

 Revision 1.4  2004/07/09 13:14:29  reddawg
 8259: changed init8259 to 8259_init
 Adjusted Startup Routines

 Revision 1.3  2004/05/20 22:51:09  reddawg
 Cleaned Up Warnings

 Revision 1.2  2004/05/10 02:23:24  reddawg
 Minor Changes To Source Code To Prepare It For Open Source Release

 END
 ***/

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