[apple/xnu.git] / libkern / libkern / i386 / OSByteOrder.h

/*
 * Copyright (c) 1999-2006 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */

#ifndef _OS_OSBYTEORDERI386_H
#define _OS_OSBYTEORDERI386_H

#include <stdint.h>
#include <libkern/i386/_OSByteOrder.h>
#include <sys/_types/_os_inline.h>

/* Functions for byte reversed loads. */

OS_INLINE
uint16_t
OSReadSwapInt16(
        const volatile void   * base,
        uintptr_t       byteOffset
        )
{
        uint16_t result;

        result = *(volatile uint16_t *)((uintptr_t)base + byteOffset);
        return _OSSwapInt16(result);
}

OS_INLINE
uint32_t
OSReadSwapInt32(
        const volatile void   * base,
        uintptr_t       byteOffset
        )
{
        uint32_t result;

        result = *(volatile uint32_t *)((uintptr_t)base + byteOffset);
        return _OSSwapInt32(result);
}

OS_INLINE
uint64_t
OSReadSwapInt64(
        const volatile void   * base,
        uintptr_t       byteOffset
        )
{
        uint64_t result;

        result = *(volatile uint64_t *)((uintptr_t)base + byteOffset);
        return _OSSwapInt64(result);
}

/* Functions for byte reversed stores. */

OS_INLINE
void
OSWriteSwapInt16(
        volatile void   * base,
        uintptr_t       byteOffset,
        uint16_t        data
        )
{
        *(volatile uint16_t *)((uintptr_t)base + byteOffset) = _OSSwapInt16(data);
}

OS_INLINE
void
OSWriteSwapInt32(
        volatile void   * base,
        uintptr_t       byteOffset,
        uint32_t        data
        )
{
        *(volatile uint32_t *)((uintptr_t)base + byteOffset) = _OSSwapInt32(data);
}

OS_INLINE
void
OSWriteSwapInt64(
        volatile void    * base,
        uintptr_t        byteOffset,
        uint64_t         data
        )
{
        *(volatile uint64_t *)((uintptr_t)base + byteOffset) = _OSSwapInt64(data);
}

#endif /* ! _OS_OSBYTEORDERI386_H */