[apple/xnu.git] / EXTERNAL_HEADERS / architecture / i386 / pio.h

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/* 
 * Mach Operating System
 * Copyright (c) 1991,1990 Carnegie Mellon University
 * All Rights Reserved.
 * 
 * Permission to use, copy, modify and distribute this software and its
 * documentation is hereby granted, provided that both the copyright
 * notice and this permission notice appear in all copies of the
 * software, derivative works or modified versions, and any portions
 * thereof, and that both notices appear in supporting documentation.
 * 
 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 * 
 * Carnegie Mellon requests users of this software to return to
 * 
 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
 *  School of Computer Science
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 */
/* 
 */
#ifndef _ARCH_I386_PIO_H_
#define _ARCH_I386_PIO_H_

typedef unsigned short i386_ioport_t;

#if defined(__GNUC__)
static __inline__ unsigned int  inl(
                                i386_ioport_t port)
{
        unsigned int datum;
        __asm__ volatile("inl %w1, %0" : "=a" (datum) : "Nd" (port));
        return(datum);
}

static __inline__ unsigned short inw(
                                i386_ioport_t port)
{
        unsigned short datum;
        __asm__ volatile("inw %w1, %w0" : "=a" (datum) : "Nd" (port));
        return(datum);
}

static __inline__ unsigned char inb(
                                i386_ioport_t port)
{
        unsigned char datum;
        __asm__ volatile("inb %w1, %b0" : "=a" (datum) : "Nd" (port));
        return(datum);
}

static __inline__ void outl(
                                i386_ioport_t port,
                                unsigned int datum)
{
        __asm__ volatile("outl %0, %w1" : : "a" (datum), "Nd" (port));
}

static __inline__ void outw(
                                i386_ioport_t port,
                                unsigned short datum)
{
        __asm__ volatile("outw %w0, %w1" : : "a" (datum), "Nd" (port));
}

static __inline__ void outb(
                                i386_ioport_t port,
                                unsigned char datum)
{
        __asm__ volatile("outb %b0, %w1" : : "a" (datum), "Nd" (port));
}
#endif /* defined(__GNUC__) */
#endif /* _ARCH_I386_PIO_H_ */