mirror of
https://github.com/gnif/LookingGlass.git
synced 2024-11-10 08:38:20 +00:00
136 lines
4.1 KiB
C
136 lines
4.1 KiB
C
/*
|
|
KVMGFX Client - A KVM Client for VGA Passthrough
|
|
Copyright (C) 2017 Geoffrey McRae <geoff@hostfission.com>
|
|
https://looking-glass.hostfission.com
|
|
|
|
This program is free software; you can redistribute it and/or modify it under
|
|
the terms of the GNU General Public License as published by the Free Software
|
|
Foundation; either version 2 of the License, or (at your option) any later
|
|
version.
|
|
|
|
This program is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
|
|
PARTICULAR PURPOSE. See the GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License along with
|
|
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
|
|
Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#pragma once
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include <tmmintrin.h>
|
|
#include <immintrin.h>
|
|
|
|
#include "debug.h"
|
|
|
|
#if defined(NATIVE_MEMCPY)
|
|
#define memcpySSE memcpy
|
|
#elif defined(_MSC_VER)
|
|
extern "C" void * memcpySSE(void *dst, const void * src, size_t length);
|
|
#elif (defined(__GNUC__) || defined(__GNUG__)) && defined(__i386__)
|
|
inline static void * memcpySSE(void *dst, const void * src, size_t length)
|
|
{
|
|
if (length == 0 || dst == src)
|
|
return;
|
|
|
|
// copies under 1MB are faster with the inlined memcpy
|
|
// tell the dev to use that instead
|
|
if (length < 1048576)
|
|
{
|
|
static bool smallBufferWarn = false;
|
|
if (!smallBufferWarn)
|
|
{
|
|
DEBUG_WARN("Do not use memcpySSE for copies under 1MB in size!");
|
|
smallBufferWarn = true;
|
|
}
|
|
memcpy(dst, src, length);
|
|
return;
|
|
}
|
|
|
|
const void * end = dst + (length & ~0x7F);
|
|
const size_t off = (7 - ((length & 0x7F) >> 4)) * 9;
|
|
|
|
__asm__ __volatile__ (
|
|
"cmp %[dst],%[end] \n\t"
|
|
"je Remain_%= \n\t"
|
|
|
|
// perform SIMD block copy
|
|
"loop_%=: \n\t"
|
|
"movaps 0x00(%[src]),%%xmm0 \n\t"
|
|
"movaps 0x10(%[src]),%%xmm1 \n\t"
|
|
"movaps 0x20(%[src]),%%xmm2 \n\t"
|
|
"movaps 0x30(%[src]),%%xmm3 \n\t"
|
|
"movaps 0x40(%[src]),%%xmm4 \n\t"
|
|
"movaps 0x50(%[src]),%%xmm5 \n\t"
|
|
"movaps 0x60(%[src]),%%xmm6 \n\t"
|
|
"movaps 0x70(%[src]),%%xmm7 \n\t"
|
|
"movntdq %%xmm0 ,0x00(%[dst]) \n\t"
|
|
"movntdq %%xmm1 ,0x10(%[dst]) \n\t"
|
|
"movntdq %%xmm2 ,0x20(%[dst]) \n\t"
|
|
"movntdq %%xmm3 ,0x30(%[dst]) \n\t"
|
|
"movntdq %%xmm4 ,0x40(%[dst]) \n\t"
|
|
"movntdq %%xmm5 ,0x50(%[dst]) \n\t"
|
|
"movntdq %%xmm6 ,0x60(%[dst]) \n\t"
|
|
"movntdq %%xmm7 ,0x70(%[dst]) \n\t"
|
|
"add $0x80,%[dst] \n\t"
|
|
"add $0x80,%[src] \n\t"
|
|
"cmp %[dst],%[end] \n\t"
|
|
"jne loop_%= \n\t"
|
|
|
|
"Remain_%=: \n\t"
|
|
|
|
// copy any remaining 16 byte blocks
|
|
"call GetPC_%=\n\t"
|
|
"Offset_%=:\n\t"
|
|
"add $(BlockTable_%= - Offset_%=), %%eax \n\t"
|
|
"add %[off],%%eax \n\t"
|
|
"jmp *%%eax \n\t"
|
|
|
|
"GetPC_%=:\n\t"
|
|
"mov (%%esp), %%eax \n\t"
|
|
"ret \n\t"
|
|
|
|
"BlockTable_%=:\n\t"
|
|
"movaps 0x60(%[src]),%%xmm6 \n\t"
|
|
"movntdq %%xmm6 ,0x60(%[dst]) \n\t"
|
|
"movaps 0x50(%[src]),%%xmm5 \n\t"
|
|
"movntdq %%xmm5 ,0x50(%[dst]) \n\t"
|
|
"movaps 0x40(%[src]),%%xmm4 \n\t"
|
|
"movntdq %%xmm4 ,0x40(%[dst]) \n\t"
|
|
"movaps 0x30(%[src]),%%xmm3 \n\t"
|
|
"movntdq %%xmm3 ,0x30(%[dst]) \n\t"
|
|
"movaps 0x20(%[src]),%%xmm2 \n\t"
|
|
"movntdq %%xmm2 ,0x20(%[dst]) \n\t"
|
|
"movaps 0x10(%[src]),%%xmm1 \n\t"
|
|
"movntdq %%xmm1 ,0x10(%[dst]) \n\t"
|
|
"movaps 0x00(%[src]),%%xmm0 \n\t"
|
|
"movntdq %%xmm0 ,0x00(%[dst]) \n\t"
|
|
"nop\n\t"
|
|
"nop\n\t"
|
|
|
|
: [dst]"+r" (dst),
|
|
[src]"+r" (src)
|
|
: [off]"r" (off),
|
|
[end]"r" (end)
|
|
: "eax",
|
|
"xmm0",
|
|
"xmm1",
|
|
"xmm2",
|
|
"xmm3",
|
|
"xmm4",
|
|
"xmm5",
|
|
"xmm6",
|
|
"xmm7",
|
|
"memory"
|
|
);
|
|
|
|
//copy any remaining bytes
|
|
memcpy(dst, src, length & 0xF);
|
|
}
|
|
#else
|
|
#define memcpySSE memcpy
|
|
#endif
|