1/* 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11#include <stdlib.h> 12#include <string.h> 13#include "vpx_ports/arm.h" 14#include "./vpx_config.h" 15 16#ifdef WINAPI_FAMILY 17#include <winapifamily.h> 18#if !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP) 19#define getenv(x) NULL 20#endif 21#endif 22 23static int arm_cpu_env_flags(int *flags) { 24 char *env; 25 env = getenv("VPX_SIMD_CAPS"); 26 if (env && *env) { 27 *flags = (int)strtol(env, NULL, 0); 28 return 0; 29 } 30 *flags = 0; 31 return -1; 32} 33 34static int arm_cpu_env_mask(void) { 35 char *env; 36 env = getenv("VPX_SIMD_CAPS_MASK"); 37 return env && *env ? (int)strtol(env, NULL, 0) : ~0; 38} 39 40#if !CONFIG_RUNTIME_CPU_DETECT 41 42int arm_cpu_caps(void) { 43 /* This function should actually be a no-op. There is no way to adjust any of 44 * these because the RTCD tables do not exist: the functions are called 45 * statically */ 46 int flags; 47 int mask; 48 if (!arm_cpu_env_flags(&flags)) { 49 return flags; 50 } 51 mask = arm_cpu_env_mask(); 52#if HAVE_MEDIA 53 flags |= HAS_MEDIA; 54#endif /* HAVE_MEDIA */ 55#if HAVE_NEON || HAVE_NEON_ASM 56 flags |= HAS_NEON; 57#endif /* HAVE_NEON || HAVE_NEON_ASM */ 58 return flags & mask; 59} 60 61#elif defined(_MSC_VER) /* end !CONFIG_RUNTIME_CPU_DETECT */ 62/*For GetExceptionCode() and EXCEPTION_ILLEGAL_INSTRUCTION.*/ 63#define WIN32_LEAN_AND_MEAN 64#define WIN32_EXTRA_LEAN 65#include <windows.h> 66 67int arm_cpu_caps(void) { 68 int flags; 69 int mask; 70 if (!arm_cpu_env_flags(&flags)) { 71 return flags; 72 } 73 mask = arm_cpu_env_mask(); 74 /* MSVC has no inline __asm support for ARM, but it does let you __emit 75 * instructions via their assembled hex code. 76 * All of these instructions should be essentially nops. 77 */ 78#if HAVE_MEDIA 79 if (mask & HAS_MEDIA) 80 __try { 81 /*SHADD8 r3,r3,r3*/ 82 __emit(0xE6333F93); 83 flags |= HAS_MEDIA; 84 } __except (GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION) { 85 /*Ignore exception.*/ 86 } 87} 88#endif /* HAVE_MEDIA */ 89#if HAVE_NEON || HAVE_NEON_ASM 90if (mask &HAS_NEON) { 91 __try { 92 /*VORR q0,q0,q0*/ 93 __emit(0xF2200150); 94 flags |= HAS_NEON; 95 } __except (GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION) { 96 /*Ignore exception.*/ 97 } 98} 99#endif /* HAVE_NEON || HAVE_NEON_ASM */ 100return flags & mask; 101} 102 103#elif defined(__ANDROID__) /* end _MSC_VER */ 104#include <cpu-features.h> 105 106int arm_cpu_caps(void) { 107 int flags; 108 int mask; 109 uint64_t features; 110 if (!arm_cpu_env_flags(&flags)) { 111 return flags; 112 } 113 mask = arm_cpu_env_mask(); 114 features = android_getCpuFeatures(); 115 116#if HAVE_MEDIA 117 flags |= HAS_MEDIA; 118#endif /* HAVE_MEDIA */ 119#if HAVE_NEON || HAVE_NEON_ASM 120 if (features & ANDROID_CPU_ARM_FEATURE_NEON) 121 flags |= HAS_NEON; 122#endif /* HAVE_NEON || HAVE_NEON_ASM */ 123 return flags & mask; 124} 125 126#elif defined(__linux__) /* end __ANDROID__ */ 127 128#include <stdio.h> 129 130int arm_cpu_caps(void) { 131 FILE *fin; 132 int flags; 133 int mask; 134 if (!arm_cpu_env_flags(&flags)) { 135 return flags; 136 } 137 mask = arm_cpu_env_mask(); 138 /* Reading /proc/self/auxv would be easier, but that doesn't work reliably 139 * on Android. 140 * This also means that detection will fail in Scratchbox. 141 */ 142 fin = fopen("/proc/cpuinfo", "r"); 143 if (fin != NULL) { 144 /* 512 should be enough for anybody (it's even enough for all the flags 145 * that x86 has accumulated... so far). 146 */ 147 char buf[512]; 148 while (fgets(buf, 511, fin) != NULL) { 149#if HAVE_NEON || HAVE_NEON_ASM 150 if (memcmp(buf, "Features", 8) == 0) { 151 char *p; 152 p = strstr(buf, " neon"); 153 if (p != NULL && (p[5] == ' ' || p[5] == '\n')) { 154 flags |= HAS_NEON; 155 } 156 } 157#endif /* HAVE_NEON || HAVE_NEON_ASM */ 158#if HAVE_MEDIA 159 if (memcmp(buf, "CPU architecture:", 17) == 0) { 160 int version; 161 version = atoi(buf + 17); 162 if (version >= 6) { 163 flags |= HAS_MEDIA; 164 } 165 } 166#endif /* HAVE_MEDIA */ 167 } 168 fclose(fin); 169 } 170 return flags & mask; 171} 172#else /* end __linux__ */ 173#error "--enable-runtime-cpu-detect selected, but no CPU detection method " \ 174"available for your platform. Reconfigure with --disable-runtime-cpu-detect." 175#endif 176