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1f6d86991f
This allows detecting CPU features with builds that have neither gcc inline assembly nor the right compiler intrinsics enabled.
92 lines
2.5 KiB
NASM
92 lines
2.5 KiB
NASM
;*****************************************************************************
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;* Copyright (C) 2005-2010 x264 project
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;*
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;* Authors: Loren Merritt <lorenm@u.washington.edu>
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;* Jason Garrett-Glaser <darkshikari@gmail.com>
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;*
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;* This file is part of Libav.
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;*
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;* Libav is free software; you can redistribute it and/or
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;* modify it under the terms of the GNU Lesser General Public
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;* License as published by the Free Software Foundation; either
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;* version 2.1 of the License, or (at your option) any later version.
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;*
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;* Libav 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 GNU
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;* Lesser General Public License for more details.
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;*
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;* You should have received a copy of the GNU Lesser General Public
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;* License along with Libav; if not, write to the Free Software
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;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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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 ff_cpu_cpuid(int index, 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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; void ff_cpu_xgetbv(int op, int *eax, int *edx)
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;-----------------------------------------------------------------------------
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cglobal cpu_xgetbv, 3,7
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push r2
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push r1
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mov ecx, r0d
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xgetbv
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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], edx
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RET
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%if ARCH_X86_64 == 0
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;-----------------------------------------------------------------------------
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; int ff_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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