pic.h

一个微型操作系统源码

/*
 * OSV
 * Copyright (C) 2002 Ciprian DOSOFTEI <[e-mail]>
 * All rights reserved.
 * 
 * http://backster.free.fr/osv
 *
 * This file is part of the OSV project. OSV is free software, also known as
 * "open source"; you can redistribute it and/or modify it under the terms 
 * of the GNU General Public License (GPL), version 2, as published by the Free
 * Software Foundation (FSF). To explore alternate licensing terms, contact 
 * the author at [e-mail] or [phone].
 * 
 * OSV is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GPL for more details.  You should have
 * received a copy of the GPL along with OSV; see the file COPYING.  If
 * not, write to the FSF, 59 Temple Place #330, Boston, MA 02111-1307, USA.
 */

#ifndef INCPIC
#define INCPIC

#include <asm/io.h>
#include <types.h>
#include <sys/params.h>
#include <exception.h>

extern void reprogramPIC(ushort master, ushort slave);
extern void unmaskIRQ(int irq);
extern void maskIRQ(int irq);
extern void refreshIRQs(void);
extern void registerIRQ(int irq, dword handler, int level);

/* other names */
#define enable_irq(x)   unmaskIRQ(x)
#define disable_irq(x)  maskIRQ(x)


#define INTERRUPT_HANDLER(handler) \
    void handler(void); \
    void isr_ ## handler(void)

#define INTERRUPT_STUB(handler) \
    asm(                               \
    ".globl isr_" #handler "  \n"      \
    "isr_" #handler ":        \n"      \
    "   pusha                 \n"      \
    "   pushw %ds             \n"      \
    "   pushw %es             \n"      \
    "   pushw %fs             \n"      \
    "   pushw %gs             \n"      \
    "   pushw %ss             \n"      \
    "   popw %ds              \n"      \
    "   call " #handler "     \n"      \
    "   popw %gs              \n"      \
    "   popw %fs              \n"      \
    "   popw %es              \n"      \
    "   popw %ds              \n"      \
    "   popa                  \n"      \
    "   iret                  \n"      \
    );                                 \
    void handler(void)

#endif