source: downloads/openal-0.0.8/src/arch/i386/x86_cpu_caps_detect_prk.nasm @ 50

;***************************************************************************
;*   Copyright (C) 2005 by Prakash Punnoor                                 *
;*   prakash@punnoor.de                                                    *
;*                                                                         *
;*   This program is free software; you can redistribute it and/or modify  *
;*   it under the terms of the GNU Library 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 Library 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.             *
;***************************************************************************

; int _alDetectx86CPUCaps(uint* caps1, uint* caps2, uint* caps3);
; derived from loki_cpuinfo.c, 1997-98 by H. Dietz and R. Fisher
; using infos from sandpile.org

; returns 0 if no CPUID available
global __alDetectx86CPUCaps
global _alDetectx86CPUCaps

__alDetectx86CPUCaps:
_alDetectx86CPUCaps:

pushf
pop     eax
mov     ecx, eax

xor     eax, 0x200000
push    eax
popf

pushf
pop     eax

xor     ecx, eax
xor     eax, eax
test    ecx, 0x200000
jz      .Return

; standard CPUID
push ebx
mov     eax, 1
cpuid
mov     eax, [esp + 8]  ;caps1 - MMX, SSE, SSE2
mov     [eax], edx
mov     eax, [esp + 12] ;caps2 - SSE3
mov     [eax], ecx

; extended CPUID
mov     eax, 0x80000001
cpuid
mov     eax, [esp + 16] ;caps3 - 3DNOW!, 3DNOW!EXT, CYRIX-MMXEXT, AMD-MMX-SSE
mov     [eax], edx
pop ebx

; End
.Return
ret

; prevent executable stack
%ifidn __OUTPUT_FORMAT__,elf
section .note.GNU-stack noalloc noexec nowrite progbits
%endif