1 files changed, 116 insertions, 0 deletions
diff --git a/media/libtheora/lib/arm/armcpu.c b/media/libtheora/lib/arm/armcpu.c
new file mode 100644
index 000000000..8b0f9a857
--- /dev/null
+++ b/media/libtheora/lib/arm/armcpu.c
@@ -0,0 +1,116 @@
+/********************************************************************
+ *                                                                  *
+ * 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_ARMV6)&& \
+ !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;
+}
+
+#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