108 lines
3.1 KiB
NASM
108 lines
3.1 KiB
NASM
;*****************************************************************************
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;* cpu-a.asm: x86 cpu utilities
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;*****************************************************************************
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;* Copyright (C) 2003-2025 x264 project
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;*
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;* Authors: Laurent Aimar <fenrir@via.ecp.fr>
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;* Loren Merritt <lorenm@u.washington.edu>
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;* Fiona Glaser <fiona@x264.com>
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;*
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;* This program is free software; you can redistribute it and/or modify
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;* it under the terms of the GNU General Public License as published by
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;* the Free Software Foundation; either version 2 of the License, or
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;* (at your option) any later version.
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;*
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;* This program is distributed in the hope that it will be useful,
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;* but WITHOUT ANY WARRANTY; without even the implied warranty of
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;* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;* GNU General Public License for more details.
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;*
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;* You should have received a copy of the GNU General Public License
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;* along with this program; if not, write to the Free Software
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;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
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;*
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;* This program is also available under a commercial proprietary license.
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;* For more information, contact us at licensing@x264.com.
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;*****************************************************************************
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%include "x86inc.asm"
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SECTION .text
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;-----------------------------------------------------------------------------
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; void cpu_cpuid( int op, int *eax, int *ebx, int *ecx, int *edx )
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;-----------------------------------------------------------------------------
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cglobal cpu_cpuid, 5,7
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push rbx
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push r4
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push r3
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push r2
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push r1
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mov eax, r0d
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xor ecx, ecx
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cpuid
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pop r4
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mov [r4], eax
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pop r4
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mov [r4], ebx
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pop r4
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mov [r4], ecx
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pop r4
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mov [r4], edx
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pop rbx
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RET
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;-----------------------------------------------------------------------------
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; uint64_t cpu_xgetbv( int xcr )
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;-----------------------------------------------------------------------------
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cglobal cpu_xgetbv
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movifnidn ecx, r0m
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xgetbv
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%if ARCH_X86_64
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shl rdx, 32
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or rax, rdx
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%endif
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ret
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;-----------------------------------------------------------------------------
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; void cpu_emms( void )
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;-----------------------------------------------------------------------------
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cglobal cpu_emms
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emms
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ret
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;-----------------------------------------------------------------------------
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; void cpu_sfence( void )
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;-----------------------------------------------------------------------------
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cglobal cpu_sfence
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sfence
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ret
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%if ARCH_X86_64 == 0
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;-----------------------------------------------------------------------------
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; int cpu_cpuid_test( void )
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; return 0 if unsupported
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;-----------------------------------------------------------------------------
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cglobal cpu_cpuid_test
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pushfd
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push ebx
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push ebp
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push esi
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push edi
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pushfd
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pop eax
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mov ebx, eax
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xor eax, 0x200000
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push eax
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popfd
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pushfd
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pop eax
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xor eax, ebx
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pop edi
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pop esi
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pop ebp
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pop ebx
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popfd
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ret
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%endif
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