/*****************************************************************************************
 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.

 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
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 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
 TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 $Id: 8259.c 54 2016-01-11 01:29:55Z reddawg $

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

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

static unsigned int irqMask = 0xFFFF;

/*!
 * \brief initialize the 8259 PIC
 *
 * This will initialize both PICs for all of our IRQs
 *
 */
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);
  }

/*!
 * \brief enable specified IRQ
 *
 * \param irqNo IRQ to enable
 */
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);
  }

/*!
 * \brief disable specified IRQ
 *
 * \param irqNo IRQ to disable
 */
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
 ***/