mirror of
https://github.com/SerenityOS/serenity
synced 2024-07-22 18:46:18 +00:00
65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
/*
|
|
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
|
|
* 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.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/Types.h>
|
|
|
|
#if defined(KERNEL) || defined(BOOTSTRAPPER)
|
|
# include <LibBareMetal/StdLib.h>
|
|
#else
|
|
# include <stdlib.h>
|
|
# include <string.h>
|
|
#endif
|
|
|
|
#if defined(__serenity__) && !defined(KERNEL) && !defined(BOOTSTRAPPER)
|
|
extern "C" void* mmx_memcpy(void* to, const void* from, size_t);
|
|
#endif
|
|
|
|
ALWAYS_INLINE void fast_u32_copy(u32* dest, const u32* src, size_t count)
|
|
{
|
|
#if defined(__serenity__) && !defined(KERNEL) && !defined(BOOTSTRAPPER)
|
|
if (count >= 256) {
|
|
mmx_memcpy(dest, src, count * sizeof(count));
|
|
return;
|
|
}
|
|
#endif
|
|
asm volatile(
|
|
"rep movsl\n"
|
|
: "=S"(src), "=D"(dest), "=c"(count)
|
|
: "S"(src), "D"(dest), "c"(count)
|
|
: "memory");
|
|
}
|
|
|
|
ALWAYS_INLINE void fast_u32_fill(u32* dest, u32 value, size_t count)
|
|
{
|
|
asm volatile(
|
|
"rep stosl\n"
|
|
: "=D"(dest), "=c"(count)
|
|
: "D"(dest), "c"(count), "a"(value)
|
|
: "memory");
|
|
}
|