diff options
Diffstat (limited to 'libavcodec/x86/cpuid.c')
| -rw-r--r-- | libavcodec/x86/cpuid.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/libavcodec/x86/cpuid.c b/libavcodec/x86/cpuid.c new file mode 100644 index 0000000000..cd33334ecf --- /dev/null +++ b/libavcodec/x86/cpuid.c @@ -0,0 +1,134 @@ +/* + * CPU detection code, extracted from mmx.h + * (c)1997-99 by H. Dietz and R. Fisher + * Converted to C and improved by Fabrice Bellard. + * + * This file is part of FFmpeg. + * + * FFmpeg 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. + * + * FFmpeg 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 FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <stdlib.h> +#include "libavutil/x86_cpu.h" +#include "libavcodec/dsputil.h" + +#undef printf + +/* ebx saving is necessary for PIC. gcc seems unable to see it alone */ +#define cpuid(index,eax,ebx,ecx,edx)\ + __asm__ volatile\ + ("mov %%"REG_b", %%"REG_S"\n\t"\ + "cpuid\n\t"\ + "xchg %%"REG_b", %%"REG_S\ + : "=a" (eax), "=S" (ebx),\ + "=c" (ecx), "=d" (edx)\ + : "0" (index)); + +/* Function to test if multimedia instructions are supported... */ +int mm_support(void) +{ + int rval = 0; + int eax, ebx, ecx, edx; + int max_std_level, max_ext_level, std_caps=0, ext_caps=0; + x86_reg a, c; + +#ifdef ARCH_X86_64 +#define PUSHF "pushfq\n\t" +#define POPF "popfq\n\t" +#else +#define PUSHF "pushfl\n\t" +#define POPF "popfl\n\t" +#endif + __asm__ volatile ( + /* See if CPUID instruction is supported ... */ + /* ... Get copies of EFLAGS into eax and ecx */ + PUSHF + "pop %0\n\t" + "mov %0, %1\n\t" + + /* ... Toggle the ID bit in one copy and store */ + /* to the EFLAGS reg */ + "xor $0x200000, %0\n\t" + "push %0\n\t" + POPF + + /* ... Get the (hopefully modified) EFLAGS */ + PUSHF + "pop %0\n\t" + : "=a" (a), "=c" (c) + : + : "cc" + ); + + if (a == c) + return 0; /* CPUID not supported */ + + cpuid(0, max_std_level, ebx, ecx, edx); + + if(max_std_level >= 1){ + cpuid(1, eax, ebx, ecx, std_caps); + if (std_caps & (1<<23)) + rval |= FF_MM_MMX; + if (std_caps & (1<<25)) + rval |= FF_MM_MMXEXT +#if !defined(__GNUC__) || __GNUC__ > 2 + | FF_MM_SSE; + if (std_caps & (1<<26)) + rval |= FF_MM_SSE2; + if (ecx & 1) + rval |= FF_MM_SSE3; + if (ecx & 0x00000200 ) + rval |= FF_MM_SSSE3 +#endif + ; + } + + cpuid(0x80000000, max_ext_level, ebx, ecx, edx); + + if(max_ext_level >= 0x80000001){ + cpuid(0x80000001, eax, ebx, ecx, ext_caps); + if (ext_caps & (1<<31)) + rval |= FF_MM_3DNOW; + if (ext_caps & (1<<30)) + rval |= FF_MM_3DNOWEXT; + if (ext_caps & (1<<23)) + rval |= FF_MM_MMX; + if (ext_caps & (1<<22)) + rval |= FF_MM_MMXEXT; + } + +#if 0 + av_log(NULL, AV_LOG_DEBUG, "%s%s%s%s%s%s%s%s\n", + (rval&FF_MM_MMX) ? "MMX ":"", + (rval&FF_MM_MMXEXT) ? "MMX2 ":"", + (rval&FF_MM_SSE) ? "SSE ":"", + (rval&FF_MM_SSE2) ? "SSE2 ":"", + (rval&FF_MM_SSE3) ? "SSE3 ":"", + (rval&FF_MM_SSSE3) ? "SSSE3 ":"", + (rval&FF_MM_3DNOW) ? "3DNow ":"", + (rval&FF_MM_3DNOWEXT) ? "3DNowExt ":""); +#endif + return rval; +} + +#ifdef TEST +int main ( void ) +{ + int mm_flags; + mm_flags = mm_support(); + printf("mm_support = 0x%08X\n",mm_flags); + return 0; +} +#endif |