127 lines
4.3 KiB
C++
127 lines
4.3 KiB
C++
////////////////////////////////////////////////////////////////////////////////
|
|
///
|
|
/// Win32 version of the x86 CPU detect routine.
|
|
///
|
|
/// This file is to be compiled in Windows platform with Microsoft Visual C++
|
|
/// Compiler. Please see 'cpu_detect_x86_gcc.cpp' for the gcc compiler version
|
|
/// for all GNU platforms.
|
|
///
|
|
/// Author : Copyright (c) Olli Parviainen
|
|
/// Author e-mail : oparviai @ iki.fi
|
|
/// SoundTouch WWW: http://www.iki.fi/oparviai/soundtouch
|
|
///
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Last changed : $Date$
|
|
// File revision : $Revision$
|
|
//
|
|
// $Id$
|
|
//
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// License :
|
|
//
|
|
// SoundTouch audio processing library
|
|
// Copyright (c) Olli Parviainen
|
|
//
|
|
// This library is free software; you can redistribute it and/or
|
|
// modify it under the terms of the GNU Lesser General Public
|
|
// License as published by the Free Software Foundation; either
|
|
// version 2.1 of the License, or (at your option) any later version.
|
|
//
|
|
// This library 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
|
|
// Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public
|
|
// License along with this library; if not, write to the Free Software
|
|
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
//
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include "cpu_detect.h"
|
|
|
|
#ifndef WIN32
|
|
#error wrong platform - this source code file is exclusively for Win32 platform
|
|
#endif
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// processor instructions extension detection routines
|
|
//
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
|
|
// Flag variable indicating whick ISA extensions are disabled (for debugging)
|
|
static uint _dwDisabledISA = 0x00; // 0xffffffff; //<- use this to disable all extensions
|
|
|
|
|
|
// Disables given set of instruction extensions. See SUPPORT_... defines.
|
|
void disableExtensions(uint dwDisableMask)
|
|
{
|
|
_dwDisabledISA = dwDisableMask;
|
|
}
|
|
|
|
|
|
|
|
/// Checks which instruction set extensions are supported by the CPU.
|
|
uint detectCPUextensions(void)
|
|
{
|
|
uint res = 0;
|
|
|
|
if (_dwDisabledISA == 0xffffffff) return 0;
|
|
|
|
_asm
|
|
{
|
|
; check if 'cpuid' instructions is available by toggling eflags bit 21
|
|
;
|
|
xor esi, esi ; clear esi = result register
|
|
|
|
pushfd ; save eflags to stack
|
|
pop eax ; load eax from stack (with eflags)
|
|
mov ecx, eax ; save the original eflags values to ecx
|
|
xor eax, 0x00200000 ; toggle bit 21
|
|
push eax ; store toggled eflags to stack
|
|
popfd ; load eflags from stack
|
|
pushfd ; save updated eflags to stack
|
|
pop eax ; load from stack
|
|
xor edx, edx ; clear edx for defaulting no mmx
|
|
cmp eax, ecx ; compare to original eflags values
|
|
jz end ; jumps to 'end' if cpuid not present
|
|
|
|
; cpuid instruction available, test for presence of mmx instructions
|
|
mov eax, 1
|
|
cpuid
|
|
test edx, 0x00800000
|
|
jz end ; branch if MMX not available
|
|
|
|
or esi, SUPPORT_MMX ; otherwise add MMX support bit
|
|
|
|
test edx, 0x02000000
|
|
jz test3DNow ; branch if SSE not available
|
|
|
|
or esi, SUPPORT_SSE ; otherwise add SSE support bit
|
|
|
|
test3DNow:
|
|
; test for precense of AMD extensions
|
|
mov eax, 0x80000000
|
|
cpuid
|
|
cmp eax, 0x80000000
|
|
jbe end ; branch if no AMD extensions detected
|
|
|
|
; test for precense of 3DNow! extension
|
|
mov eax, 0x80000001
|
|
cpuid
|
|
test edx, 0x80000000
|
|
jz end ; branch if 3DNow! not detected
|
|
|
|
or esi, SUPPORT_3DNOW ; otherwise add 3DNow support bit
|
|
|
|
end:
|
|
|
|
mov res, esi
|
|
}
|
|
|
|
return res & ~_dwDisabledISA;
|
|
}
|