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Diffstat (limited to '')
| -rw-r--r-- | media/libtheora/lib/x86/x86cpu.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/media/libtheora/lib/x86/x86cpu.c b/media/libtheora/lib/x86/x86cpu.c new file mode 100644 index 0000000000..49fd76d0ac --- /dev/null +++ b/media/libtheora/lib/x86/x86cpu.c @@ -0,0 +1,182 @@ +/******************************************************************** + * * + * THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. * + * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * + * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * + * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * + * * + * THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009 * + * by the Xiph.Org Foundation and contributors http://www.xiph.org/ * + * * + ******************************************************************** + + CPU capability detection for x86 processors. + Originally written by Rudolf Marek. + + function: + last mod: $Id$ + + ********************************************************************/ + +#include "x86cpu.h" + +#if !defined(OC_X86_ASM) +ogg_uint32_t oc_cpu_flags_get(void){ + return 0; +} +#else +# if defined(__amd64__)||defined(__x86_64__) +/*On x86-64, gcc seems to be able to figure out how to save %rbx for us when + compiling with -fPIC.*/ +# define cpuid(_op,_eax,_ebx,_ecx,_edx) \ + __asm__ __volatile__( \ + "cpuid\n\t" \ + :[eax]"=a"(_eax),[ebx]"=b"(_ebx),[ecx]"=c"(_ecx),[edx]"=d"(_edx) \ + :"a"(_op) \ + :"cc" \ + ) +# else +/*On x86-32, not so much.*/ +# define cpuid(_op,_eax,_ebx,_ecx,_edx) \ + __asm__ __volatile__( \ + "xchgl %%ebx,%[ebx]\n\t" \ + "cpuid\n\t" \ + "xchgl %%ebx,%[ebx]\n\t" \ + :[eax]"=a"(_eax),[ebx]"=r"(_ebx),[ecx]"=c"(_ecx),[edx]"=d"(_edx) \ + :"a"(_op) \ + :"cc" \ + ) +# endif + +static ogg_uint32_t oc_parse_intel_flags(ogg_uint32_t _edx,ogg_uint32_t _ecx){ + ogg_uint32_t flags; + /*If there isn't even MMX, give up.*/ + if(!(_edx&0x00800000))return 0; + flags=OC_CPU_X86_MMX; + if(_edx&0x02000000)flags|=OC_CPU_X86_MMXEXT|OC_CPU_X86_SSE; + if(_edx&0x04000000)flags|=OC_CPU_X86_SSE2; + if(_ecx&0x00000001)flags|=OC_CPU_X86_PNI; + if(_ecx&0x00000100)flags|=OC_CPU_X86_SSSE3; + if(_ecx&0x00080000)flags|=OC_CPU_X86_SSE4_1; + if(_ecx&0x00100000)flags|=OC_CPU_X86_SSE4_2; + return flags; +} + +static ogg_uint32_t oc_parse_amd_flags(ogg_uint32_t _edx,ogg_uint32_t _ecx){ + ogg_uint32_t flags; + /*If there isn't even MMX, give up.*/ + if(!(_edx&0x00800000))return 0; + flags=OC_CPU_X86_MMX; + if(_edx&0x00400000)flags|=OC_CPU_X86_MMXEXT; + if(_edx&0x80000000)flags|=OC_CPU_X86_3DNOW; + if(_edx&0x40000000)flags|=OC_CPU_X86_3DNOWEXT; + if(_ecx&0x00000040)flags|=OC_CPU_X86_SSE4A; + if(_ecx&0x00000800)flags|=OC_CPU_X86_SSE5; + return flags; +} + +ogg_uint32_t oc_cpu_flags_get(void){ + ogg_uint32_t flags; + ogg_uint32_t eax; + ogg_uint32_t ebx; + ogg_uint32_t ecx; + ogg_uint32_t edx; +# if !defined(__amd64__)&&!defined(__x86_64__) + /*Not all x86-32 chips support cpuid, so we have to check.*/ + __asm__ __volatile__( + "pushfl\n\t" + "pushfl\n\t" + "popl %[a]\n\t" + "movl %[a],%[b]\n\t" + "xorl $0x200000,%[a]\n\t" + "pushl %[a]\n\t" + "popfl\n\t" + "pushfl\n\t" + "popl %[a]\n\t" + "popfl\n\t" + :[a]"=r"(eax),[b]"=r"(ebx) + : + :"cc" + ); + /*No cpuid.*/ + if(eax==ebx)return 0; +# endif + cpuid(0,eax,ebx,ecx,edx); + /* l e t n I e n i u n e G*/ + if(ecx==0x6C65746E&&edx==0x49656E69&&ebx==0x756E6547|| + /* 6 8 x M T e n i u n e G*/ + ecx==0x3638784D&&edx==0x54656E69&&ebx==0x756E6547){ + int family; + int model; + /*Intel, Transmeta (tested with Crusoe TM5800):*/ + cpuid(1,eax,ebx,ecx,edx); + flags=oc_parse_intel_flags(edx,ecx); + family=(eax>>8)&0xF; + model=(eax>>4)&0xF; + /*The SSE unit on the Pentium M and Core Duo is much slower than the MMX + unit, so don't use it.*/ + if(family==6&&(model==9||model==13||model==14)){ + flags&=~(OC_CPU_X86_SSE2|OC_CPU_X86_PNI); + } + } + /* D M A c i t n e h t u A*/ + else if(ecx==0x444D4163&&edx==0x69746E65&&ebx==0x68747541|| + /* C S N y b e d o e G*/ + ecx==0x43534e20&&edx==0x79622065&&ebx==0x646f6547){ + /*AMD, Geode:*/ + cpuid(0x80000000,eax,ebx,ecx,edx); + if(eax<0x80000001)flags=0; + else{ + cpuid(0x80000001,eax,ebx,ecx,edx); + flags=oc_parse_amd_flags(edx,ecx); + } + /*Also check for SSE.*/ + cpuid(1,eax,ebx,ecx,edx); + flags|=oc_parse_intel_flags(edx,ecx); + } + /*Technically some VIA chips can be configured in the BIOS to return any + string here the user wants. + There is a special detection method that can be used to identify such + processors, but in my opinion, if the user really wants to change it, they + deserve what they get.*/ + /* s l u a H r u a t n e C*/ + else if(ecx==0x736C7561&&edx==0x48727561&&ebx==0x746E6543){ + /*VIA:*/ + /*I only have documentation for the C7 (Esther) and Isaiah (forthcoming) + chips (thanks to the engineers from Centaur Technology who provided it). + These chips support Intel-like cpuid info. + The C3-2 (Nehemiah) cores appear to, as well.*/ + cpuid(1,eax,ebx,ecx,edx); + flags=oc_parse_intel_flags(edx,ecx); + if(eax>=0x80000001){ + /*The (non-Nehemiah) C3 processors support AMD-like cpuid info. + We need to check this even if the Intel test succeeds to pick up 3DNow! + support on these processors. + Unlike actual AMD processors, we cannot _rely_ on this info, since + some cores (e.g., the 693 stepping of the Nehemiah) claim to support + this function, yet return edx=0, despite the Intel test indicating + MMX support. + Therefore the features detected here are strictly added to those + detected by the Intel test.*/ + /*TODO: How about earlier chips?*/ + cpuid(0x80000001,eax,ebx,ecx,edx); + /*Note: As of the C7, this function returns Intel-style extended feature + flags, not AMD-style. + Currently, this only defines bits 11, 20, and 29 (0x20100800), which + do not conflict with any of the AMD flags we inspect. + For the remaining bits, Intel tells us, "Do not count on their value", + but VIA assures us that they will all be zero (at least on the C7 and + Isaiah chips). + In the (unlikely) event a future processor uses bits 18, 19, 30, or 31 + (0xC0C00000) for something else, we will have to add code to detect + the model to decide when it is appropriate to inspect them.*/ + flags|=oc_parse_amd_flags(edx,ecx); + } + } + else{ + /*Implement me.*/ + flags=0; + } + return flags; +} +#endif |