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1480 palkovsky 1 
/*
2071 jermar 2 
 * Copyright (c) 2006 Ondrej Palkovsky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup ppc32  
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 * @{
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 */
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/** @file
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 */
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#include <arch/drivers/pic.h>
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#include <mm/page.h>
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#include <byteorder.h>
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#include <bitops.h>
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static volatile uint32_t *pic;
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void pic_init(uintptr_t base, size_t size)
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{
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    pic = (uint32_t *) hw_map(base, size);
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}
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void pic_enable_interrupt(int intnum)
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{
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    if (intnum < 32) {
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        pic[PIC_MASK_LOW] = pic[PIC_MASK_LOW] | (1 << intnum);
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    } else {
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        pic[PIC_MASK_HIGH] = pic[PIC_MASK_HIGH] | (1 << (intnum - 32));
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    }
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}
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void pic_disable_interrupt(int intnum)
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{
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    if (intnum < 32) {
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        pic[PIC_MASK_LOW] = pic[PIC_MASK_LOW] & (~(1 << intnum));
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    } else {
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        pic[PIC_MASK_HIGH] = pic[PIC_MASK_HIGH] & (~(1 << (intnum - 32)));
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    }
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}
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void pic_ack_interrupt(int intnum)
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{
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    if (intnum < 32)
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        pic[PIC_ACK_LOW] = 1 << intnum;
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    else
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        pic[PIC_ACK_HIGH] = 1 << (intnum - 32);
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}
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/** Return number of pending interrupt */
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int pic_get_pending(void)
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{
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    int pending;
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    pending = pic[PIC_PENDING_LOW];
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    if (pending)
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        return fnzb32(pending);
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    pending = pic[PIC_PENDING_HIGH];
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    if (pending)
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        return fnzb32(pending) + 32;
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    return -1;
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}
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/** @}
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 */