/*
* Copyright (c) 2017, The Linux Foundation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the copyright holder nor the names of its contributors
* may be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.
*/
#include "AEEatomic.h"

#ifdef _WIN32
#include "Windows.h"
uint32 atomic_CompareAndExchange(uint32 *volatile puDest, uint32 uExchange, uint32 uCompare)
{
	return (uint32)InterlockedCompareExchange(puDest, uExchange, uCompare);
}

#elif __hexagon__
static inline unsigned int
qurt_atomic_compare_val_and_set(unsigned int *target,
                                unsigned int old_val,
                                unsigned int new_val)
{
	unsigned int current_val;

	__asm__ __volatile__(
	    "1:     %0 = memw_locked(%2)\n"
	    "       p0 = cmp.eq(%0, %3)\n"
	    "       if !p0 jump 2f\n"
	    "       memw_locked(%2, p0) = %4\n"
	    "       if !p0 jump 1b\n"
	    "2:\n"
	    : "=&r"(current_val), "+m"(*target)
	    : "r"(target), "r"(old_val), "r"(new_val)
	    : "p0");

	return current_val;
}
uint32 atomic_CompareAndExchange(uint32 *volatile puDest, uint32 uExchange, uint32 uCompare)
{
	return (uint32)qurt_atomic_compare_val_and_set((unsigned int *)puDest, uCompare, uExchange);
}

#elif __GNUC__
uint32 atomic_CompareAndExchange(uint32 *volatile puDest, uint32 uExchange, uint32 uCompare)
{
	return __sync_val_compare_and_swap(puDest, uCompare, uExchange);
}
#endif