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Diffstat (limited to 'media/libtheora/lib/arm/armcpu.c')
| -rw-r--r-- | media/libtheora/lib/arm/armcpu.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/media/libtheora/lib/arm/armcpu.c b/media/libtheora/lib/arm/armcpu.c new file mode 100644 index 0000000000..f1941bdc15 --- /dev/null +++ b/media/libtheora/lib/arm/armcpu.c @@ -0,0 +1,154 @@ +/******************************************************************** + * * + * 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) 2002-2010 * + * by the Xiph.Org Foundation and contributors http://www.xiph.org/ * + * * + ******************************************************************** + + CPU capability detection for ARM processors. + + function: + last mod: $Id: cpu.c 17344 2010-07-21 01:42:18Z tterribe $ + + ********************************************************************/ + +#include "armcpu.h" + +#if !defined(OC_ARM_ASM)|| \ + !defined(OC_ARM_ASM_EDSP)&&!defined(OC_ARM_ASM_MEDIA)&& \ + !defined(OC_ARM_ASM_NEON) +ogg_uint32_t oc_cpu_flags_get(void){ + return 0; +} + +#elif defined(_MSC_VER) +/*For GetExceptionCode() and EXCEPTION_ILLEGAL_INSTRUCTION.*/ +# define WIN32_LEAN_AND_MEAN +# define WIN32_EXTRA_LEAN +# include <windows.h> + +ogg_uint32_t oc_cpu_flags_get(void){ + ogg_uint32_t flags; + flags=0; + /*MSVC has no inline __asm support for ARM, but it does let you __emit + instructions via their assembled hex code. + All of these instructions should be essentially nops.*/ +# if defined(OC_ARM_ASM_EDSP) + __try{ + /*PLD [r13]*/ + __emit(0xF5DDF000); + flags|=OC_CPU_ARM_EDSP; + } + __except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION){ + /*Ignore exception.*/ + } +# if defined(OC_ARM_ASM_MEDIA) + __try{ + /*SHADD8 r3,r3,r3*/ + __emit(0xE6333F93); + flags|=OC_CPU_ARM_MEDIA; + } + __except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION){ + /*Ignore exception.*/ + } +# if defined(OC_ARM_ASM_NEON) + __try{ + /*VORR q0,q0,q0*/ + __emit(0xF2200150); + flags|=OC_CPU_ARM_NEON; + } + __except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION){ + /*Ignore exception.*/ + } +# endif +# endif +# endif + return flags; +} + +#elif defined(__linux__) +# include <stdio.h> +# include <stdlib.h> +# include <string.h> + +ogg_uint32_t oc_cpu_flags_get(void){ + ogg_uint32_t flags; + FILE *fin; + flags=0; + /*Reading /proc/self/auxv would be easier, but that doesn't work reliably on + Android. + This also means that detection will fail in Scratchbox.*/ + fin=fopen("/proc/cpuinfo","r"); + if(fin!=NULL){ + /*512 should be enough for anybody (it's even enough for all the flags that + x86 has accumulated... so far).*/ + char buf[512]; + while(fgets(buf,511,fin)!=NULL){ + if(memcmp(buf,"Features",8)==0){ + char *p; + p=strstr(buf," edsp"); + if(p!=NULL&&(p[5]==' '||p[5]=='\n'))flags|=OC_CPU_ARM_EDSP; + p=strstr(buf," neon"); + if(p!=NULL&&(p[5]==' '||p[5]=='\n'))flags|=OC_CPU_ARM_NEON; + } + if(memcmp(buf,"CPU architecture:",17)==0){ + int version; + version=atoi(buf+17); + if(version>=6)flags|=OC_CPU_ARM_MEDIA; + } + } + fclose(fin); + } + return flags; +} + +#elif defined(__riscos__) +#include <kernel.h> +#include <swis.h> + +ogg_uint32_t oc_cpu_flags_get(void) { + ogg_uint32_t flags = 0; + +#if defined(OC_ARM_ASM_EDSP) || defined(OC_ARM_ASM_MEDIA) + + if (_swi(OS_Byte,_IN(0)|_IN(2)|_RETURN(1), 129, 0xFF) <= 0xA9) + _swix(OS_Module, _INR(0,1), 1, "System:Modules.CallASWI"); + + ogg_uint32_t features; + _kernel_oserror* test = _swix(OS_PlatformFeatures, _IN(0)|_OUT(0), 0, &features); + if (test == NULL) { +#if defined(OC_ARM_ASM_EDSP) + if((features>>10 & 1) == 1)flags|=OC_CPU_ARM_EDSP; +#endif + +#if defined(OC_ARM_ASM_MEDIA) + if ((features>>31 & 1) == 1) { + ogg_uint32_t shadd = 0; + test =_swix(OS_PlatformFeatures, _INR(0,1)|_OUT(0), 34, 29, &shadd); + if (test==NULL && shadd==1)flags|=OC_CPU_ARM_MEDIA; + } +#endif + } +#endif + +#if defined(OC_ARM_ASM_NEON) + ogg_uint32_t mvfr1; + test = _swix(VFPSupport_Features, _IN(0)|_OUT(2), 0, &mvfr1); + if (test==NULL && (mvfr1 & 0xFFF00)==0x11100)flags|=OC_CPU_ARM_NEON; +#endif + + return flags; +} + +#else +/*The feature registers which can tell us what the processor supports are + accessible in priveleged modes only, so we can't have a general user-space + detection method like on x86.*/ +# error "Configured to use ARM asm but no CPU detection method available for " \ + "your platform. Reconfigure with --disable-asm (or send patches)." +#endif |