cpu-a.asm
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;*****************************************************************************
;* cpu-a.asm: x86 cpu utilities
;*****************************************************************************
;* Copyright (C) 2003-2024 x264 project
;*
;* Authors: Laurent Aimar <fenrir@via.ecp.fr>
;* Loren Merritt <lorenm@u.washington.edu>
;* Fiona Glaser <fiona@x264.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., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
;*
;* This program is also available under a commercial proprietary license.
;* For more information, contact us at licensing@x264.com.
;*****************************************************************************
%include "x86inc.asm"
SECTION .text
;-----------------------------------------------------------------------------
; void cpu_cpuid( int op, int *eax, int *ebx, int *ecx, int *edx )
;-----------------------------------------------------------------------------
cglobal cpu_cpuid, 5,7
push rbx
push r4
push r3
push r2
push r1
mov eax, r0d
xor ecx, ecx
cpuid
pop r4
mov [r4], eax
pop r4
mov [r4], ebx
pop r4
mov [r4], ecx
pop r4
mov [r4], edx
pop rbx
RET
;-----------------------------------------------------------------------------
; uint64_t cpu_xgetbv( int xcr )
;-----------------------------------------------------------------------------
cglobal cpu_xgetbv
movifnidn ecx, r0m
xgetbv
%if ARCH_X86_64
shl rdx, 32
or rax, rdx
%endif
ret
;-----------------------------------------------------------------------------
; void cpu_emms( void )
;-----------------------------------------------------------------------------
cglobal cpu_emms
emms
ret
;-----------------------------------------------------------------------------
; void cpu_sfence( void )
;-----------------------------------------------------------------------------
cglobal cpu_sfence
sfence
ret
%if ARCH_X86_64 == 0
;-----------------------------------------------------------------------------
; int cpu_cpuid_test( void )
; return 0 if unsupported
;-----------------------------------------------------------------------------
cglobal cpu_cpuid_test
pushfd
push ebx
push ebp
push esi
push edi
pushfd
pop eax
mov ebx, eax
xor eax, 0x200000
push eax
popfd
pushfd
pop eax
xor eax, ebx
pop edi
pop esi
pop ebp
pop ebx
popfd
ret
%endif