diff options
| author | Diego Biurrun <diego@biurrun.de> | 2012-10-03 16:46:17 +0200 |
|---|---|---|
| committer | Diego Biurrun <diego@biurrun.de> | 2012-10-04 19:29:14 +0200 |
| commit | 1f6d86991f191568d45484f2b3740c2dcd0a7b45 (patch) | |
| tree | e1014f6fb0443725e607d7c926337759c0cbf303 /libavutil/x86/cpuid.asm | |
| parent | 65d12900432ac880d764edbbd36818431484a76e (diff) | |
x86: Add YASM implementations of cpuid and xgetbv from x264
This allows detecting CPU features with builds that have neither
gcc inline assembly nor the right compiler intrinsics enabled.
Diffstat (limited to 'libavutil/x86/cpuid.asm')
| -rw-r--r-- | libavutil/x86/cpuid.asm | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/libavutil/x86/cpuid.asm b/libavutil/x86/cpuid.asm new file mode 100644 index 0000000000..d2ac1f01dc --- /dev/null +++ b/libavutil/x86/cpuid.asm @@ -0,0 +1,91 @@ +;***************************************************************************** +;* Copyright (C) 2005-2010 x264 project +;* +;* Authors: Loren Merritt <lorenm@u.washington.edu> +;* Jason Garrett-Glaser <darkshikari@gmail.com> +;* +;* This file is part of Libav. +;* +;* Libav 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. +;* +;* Libav 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 Libav; if not, write to the Free Software +;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA +;****************************************************************************** + +%include "x86inc.asm" + +SECTION .text + +;----------------------------------------------------------------------------- +; void ff_cpu_cpuid(int index, 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 + +;----------------------------------------------------------------------------- +; void ff_cpu_xgetbv(int op, int *eax, int *edx) +;----------------------------------------------------------------------------- +cglobal cpu_xgetbv, 3,7 + push r2 + push r1 + mov ecx, r0d + xgetbv + pop r4 + mov [r4], eax + pop r4 + mov [r4], edx + RET + +%if ARCH_X86_64 == 0 +;----------------------------------------------------------------------------- +; int ff_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 |