/*
* Copyright 2014-2018, Intel Corporation
*
* 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.
*
* * 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
* OWNER 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.
*/
#ifndef X86_64_FLUSH_H
#define X86_64_FLUSH_H
#include <emmintrin.h>
#include <stddef.h>
#include <stdint.h>
#include "util.h"
#define FLUSH_ALIGN ((uintptr_t)64)
#ifdef _MSC_VER
#define pmem_clflushopt _mm_clflushopt
#define pmem_clwb _mm_clwb
#else
/*
* The x86 memory instructions are new enough that the compiler
* intrinsic functions are not always available. The intrinsic
* functions are defined here in terms of asm statements for now.
*/
#define pmem_clflushopt(addr)\
asm volatile(".byte 0x66; clflush %0" : "+m" \
(*(volatile char *)(addr)));
#define pmem_clwb(addr)\
asm volatile(".byte 0x66; xsaveopt %0" : "+m" \
(*(volatile char *)(addr)));
#endif /* _MSC_VER */
/*
* flush_clflush_nolog -- flush the CPU cache, using clflush
*/
static force_inline void
flush_clflush_nolog(const void *addr, size_t len)
{
uintptr_t uptr;
/*
* Loop through cache-line-size (typically 64B) aligned chunks
* covering the given range.
*/
for (uptr = (uintptr_t)addr & ~(FLUSH_ALIGN - 1);
uptr < (uintptr_t)addr + len; uptr += FLUSH_ALIGN)
_mm_clflush((char *)uptr);
}
/*
* flush_clflushopt_nolog -- flush the CPU cache, using clflushopt
*/
static force_inline void
flush_clflushopt_nolog(const void *addr, size_t len)
{
uintptr_t uptr;
/*
* Loop through cache-line-size (typically 64B) aligned chunks
* covering the given range.
*/
for (uptr = (uintptr_t)addr & ~(FLUSH_ALIGN - 1);
uptr < (uintptr_t)addr + len; uptr += FLUSH_ALIGN) {
pmem_clflushopt((char *)uptr);
}
}
/*
* flush_clwb_nolog -- flush the CPU cache, using clwb
*/
static force_inline void
flush_clwb_nolog(const void *addr, size_t len)
{
uintptr_t uptr;
/*
* Loop through cache-line-size (typically 64B) aligned chunks
* covering the given range.
*/
for (uptr = (uintptr_t)addr & ~(FLUSH_ALIGN - 1);
uptr < (uintptr_t)addr + len; uptr += FLUSH_ALIGN) {
pmem_clwb((char *)uptr);
}
}
#endif