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_EDSP 53 flags |= HAS_EDSP; 54#endif /* HAVE_EDSP */ 55#if HAVE_MEDIA 56 flags |= HAS_MEDIA; 57#endif /* HAVE_MEDIA */ 58#if HAVE_NEON || HAVE_NEON_ASM 59 flags |= HAS_NEON; 60#endif /* HAVE_NEON || HAVE_NEON_ASM */ 61 return flags & mask; 62} 63 64#elif defined(_MSC_VER) /* end !CONFIG_RUNTIME_CPU_DETECT */ 65/*For GetExceptionCode() and EXCEPTION_ILLEGAL_INSTRUCTION.*/ 66#define WIN32_LEAN_AND_MEAN 67#define WIN32_EXTRA_LEAN 68#include <windows.h> 69 70int arm_cpu_caps(void) { 71 int flags; 72 int mask; 73 if (!arm_cpu_env_flags(&flags)) { 74 return flags; 75 } 76 mask = arm_cpu_env_mask(); 77 /* MSVC has no inline __asm support for ARM, but it does let you __emit 78 * instructions via their assembled hex code. 79 * All of these instructions should be essentially nops. 80 */ 81#if HAVE_EDSP 82 if (mask & HAS_EDSP) { 83 __try { 84 /*PLD [r13]*/ 85 __emit(0xF5DDF000); 86 flags |= HAS_EDSP; 87 } __except (GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION) { 88 /*Ignore exception.*/ 89 } 90 } 91#endif /* HAVE_EDSP */ 92#if HAVE_MEDIA 93 if (mask & HAS_MEDIA) 94 __try { 95 /*SHADD8 r3,r3,r3*/ 96 __emit(0xE6333F93); 97 flags |= HAS_MEDIA; 98 } __except (GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION) { 99 /*Ignore exception.*/ 100 } 101} 102#endif /* HAVE_MEDIA */ 103#if HAVE_NEON || HAVE_NEON_ASM 104if (mask &HAS_NEON) { 105 __try { 106 /*VORR q0,q0,q0*/ 107 __emit(0xF2200150); 108 flags |= HAS_NEON; 109 } __except (GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION) { 110 /*Ignore exception.*/ 111 } 112} 113#endif /* HAVE_NEON || HAVE_NEON_ASM */ 114return flags & mask; 115} 116 117#elif defined(__ANDROID__) /* end _MSC_VER */ 118#include <cpu-features.h> 119 120int arm_cpu_caps(void) { 121 int flags; 122 int mask; 123 uint64_t features; 124 if (!arm_cpu_env_flags(&flags)) { 125 return flags; 126 } 127 mask = arm_cpu_env_mask(); 128 features = android_getCpuFeatures(); 129 130#if HAVE_EDSP 131 flags |= HAS_EDSP; 132#endif /* HAVE_EDSP */ 133#if HAVE_MEDIA 134 flags |= HAS_MEDIA; 135#endif /* HAVE_MEDIA */ 136#if HAVE_NEON || HAVE_NEON_ASM 137 if (features & ANDROID_CPU_ARM_FEATURE_NEON) 138 flags |= HAS_NEON; 139#endif /* HAVE_NEON || HAVE_NEON_ASM */ 140 return flags & mask; 141} 142 143#elif defined(__linux__) /* end __ANDROID__ */ 144 145#include <stdio.h> 146 147int arm_cpu_caps(void) { 148 FILE *fin; 149 int flags; 150 int mask; 151 if (!arm_cpu_env_flags(&flags)) { 152 return flags; 153 } 154 mask = arm_cpu_env_mask(); 155 /* Reading /proc/self/auxv would be easier, but that doesn't work reliably 156 * on Android. 157 * This also means that detection will fail in Scratchbox. 158 */ 159 fin = fopen("/proc/cpuinfo", "r"); 160 if (fin != NULL) { 161 /* 512 should be enough for anybody (it's even enough for all the flags 162 * that x86 has accumulated... so far). 163 */ 164 char buf[512]; 165 while (fgets(buf, 511, fin) != NULL) { 166#if HAVE_EDSP || HAVE_NEON || HAVE_NEON_ASM 167 if (memcmp(buf, "Features", 8) == 0) { 168 char *p; 169#if HAVE_EDSP 170 p = strstr(buf, " edsp"); 171 if (p != NULL && (p[5] == ' ' || p[5] == '\n')) { 172 flags |= HAS_EDSP; 173 } 174#endif /* HAVE_EDSP */ 175#if HAVE_NEON || HAVE_NEON_ASM 176 p = strstr(buf, " neon"); 177 if (p != NULL && (p[5] == ' ' || p[5] == '\n')) { 178 flags |= HAS_NEON; 179 } 180#endif /* HAVE_NEON || HAVE_NEON_ASM */ 181 } 182#endif /* HAVE_EDSP || HAVE_NEON || HAVE_NEON_ASM */ 183#if HAVE_MEDIA 184 if (memcmp(buf, "CPU architecture:", 17) == 0) { 185 int version; 186 version = atoi(buf + 17); 187 if (version >= 6) { 188 flags |= HAS_MEDIA; 189 } 190 } 191#endif /* HAVE_MEDIA */ 192 } 193 fclose(fin); 194 } 195 return flags & mask; 196} 197#else /* end __linux__ */ 198#error "--enable-runtime-cpu-detect selected, but no CPU detection method " \ 199"available for your platform. Reconfigure with --disable-runtime-cpu-detect." 200#endif 201