HelenOS sources

root/kernel/arch/sparc64/include/arch/barrier.h

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INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. flush_pipeline
  2. membar

/*
 * Copyright (c) 2005 Jakub Jermar
 * 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 and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/** @addtogroup kernel_sparc64
 * @{
 */
/** @file
 */

#ifndef KERN_sparc64_BARRIER_H_
#define KERN_sparc64_BARRIER_H_

#include <trace.h>

/** Flush Instruction pipeline. */
_NO_TRACE static inline void flush_pipeline(void)
{
        unsigned long pc;

        /*
         * The FLUSH instruction takes address parameter.
         * As such, it may trap if the address is not found in DTLB.
         *
         * The entire kernel text is mapped by a locked ITLB and
         * DTLB entries. Therefore, when this function is called,
         * the %pc register will always be in the range mapped by
         * DTLB.
         *
         */

        asm volatile (
            "rd %%pc, %[pc]\n"
            "flush %[pc]\n"
            : [pc] "=&r" (pc)
        );
}

/** Memory Barrier instruction. */
_NO_TRACE static inline void membar(void)
{
        asm volatile (
            "membar #Sync\n"
        );
}

#endif

/** @}
 */

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