1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libtheora/lib/arm/armcpu.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,116 @@
1.4 +/********************************************************************
1.5 + * *
1.6 + * THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE. *
1.7 + * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
1.8 + * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
1.9 + * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
1.10 + * *
1.11 + * THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2010 *
1.12 + * by the Xiph.Org Foundation and contributors http://www.xiph.org/ *
1.13 + * *
1.14 + ********************************************************************
1.15 +
1.16 + CPU capability detection for ARM processors.
1.17 +
1.18 + function:
1.19 + last mod: $Id: cpu.c 17344 2010-07-21 01:42:18Z tterribe $
1.20 +
1.21 + ********************************************************************/
1.22 +
1.23 +#include "armcpu.h"
1.24 +
1.25 +#if !defined(OC_ARM_ASM)|| \
1.26 + !defined(OC_ARM_ASM_EDSP)&&!defined(OC_ARM_ASM_ARMV6)&& \
1.27 + !defined(OC_ARM_ASM_NEON)
1.28 +ogg_uint32_t oc_cpu_flags_get(void){
1.29 + return 0;
1.30 +}
1.31 +
1.32 +#elif defined(_MSC_VER)
1.33 +/*For GetExceptionCode() and EXCEPTION_ILLEGAL_INSTRUCTION.*/
1.34 +# define WIN32_LEAN_AND_MEAN
1.35 +# define WIN32_EXTRA_LEAN
1.36 +# include <windows.h>
1.37 +
1.38 +ogg_uint32_t oc_cpu_flags_get(void){
1.39 + ogg_uint32_t flags;
1.40 + flags=0;
1.41 + /*MSVC has no inline __asm support for ARM, but it does let you __emit
1.42 + instructions via their assembled hex code.
1.43 + All of these instructions should be essentially nops.*/
1.44 +# if defined(OC_ARM_ASM_EDSP)
1.45 + __try{
1.46 + /*PLD [r13]*/
1.47 + __emit(0xF5DDF000);
1.48 + flags|=OC_CPU_ARM_EDSP;
1.49 + }
1.50 + __except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION){
1.51 + /*Ignore exception.*/
1.52 + }
1.53 +# if defined(OC_ARM_ASM_MEDIA)
1.54 + __try{
1.55 + /*SHADD8 r3,r3,r3*/
1.56 + __emit(0xE6333F93);
1.57 + flags|=OC_CPU_ARM_MEDIA;
1.58 + }
1.59 + __except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION){
1.60 + /*Ignore exception.*/
1.61 + }
1.62 +# if defined(OC_ARM_ASM_NEON)
1.63 + __try{
1.64 + /*VORR q0,q0,q0*/
1.65 + __emit(0xF2200150);
1.66 + flags|=OC_CPU_ARM_NEON;
1.67 + }
1.68 + __except(GetExceptionCode()==EXCEPTION_ILLEGAL_INSTRUCTION){
1.69 + /*Ignore exception.*/
1.70 + }
1.71 +# endif
1.72 +# endif
1.73 +# endif
1.74 + return flags;
1.75 +}
1.76 +
1.77 +#elif defined(__linux__)
1.78 +# include <stdio.h>
1.79 +# include <stdlib.h>
1.80 +# include <string.h>
1.81 +
1.82 +ogg_uint32_t oc_cpu_flags_get(void){
1.83 + ogg_uint32_t flags;
1.84 + FILE *fin;
1.85 + flags=0;
1.86 + /*Reading /proc/self/auxv would be easier, but that doesn't work reliably on
1.87 + Android.
1.88 + This also means that detection will fail in Scratchbox.*/
1.89 + fin=fopen("/proc/cpuinfo","r");
1.90 + if(fin!=NULL){
1.91 + /*512 should be enough for anybody (it's even enough for all the flags that
1.92 + x86 has accumulated... so far).*/
1.93 + char buf[512];
1.94 + while(fgets(buf,511,fin)!=NULL){
1.95 + if(memcmp(buf,"Features",8)==0){
1.96 + char *p;
1.97 + p=strstr(buf," edsp");
1.98 + if(p!=NULL&&(p[5]==' '||p[5]=='\n'))flags|=OC_CPU_ARM_EDSP;
1.99 + p=strstr(buf," neon");
1.100 + if(p!=NULL&&(p[5]==' '||p[5]=='\n'))flags|=OC_CPU_ARM_NEON;
1.101 + }
1.102 + if(memcmp(buf,"CPU architecture:",17)==0){
1.103 + int version;
1.104 + version=atoi(buf+17);
1.105 + if(version>=6)flags|=OC_CPU_ARM_MEDIA;
1.106 + }
1.107 + }
1.108 + fclose(fin);
1.109 + }
1.110 + return flags;
1.111 +}
1.112 +
1.113 +#else
1.114 +/*The feature registers which can tell us what the processor supports are
1.115 + accessible in priveleged modes only, so we can't have a general user-space
1.116 + detection method like on x86.*/
1.117 +# error "Configured to use ARM asm but no CPU detection method available for " \
1.118 + "your platform. Reconfigure with --disable-asm (or send patches)."
1.119 +#endif
