1 /* 2 * Copyright 2000 SuSE, Inc. 3 * Copyright 2007 Red Hat, Inc. 4 * 5 * Permission to use, copy, modify, distribute, and sell this software and its 6 * documentation for any purpose is hereby granted without fee, provided that 7 * the above copyright notice appear in all copies and that both that 8 * copyright notice and this permission notice appear in supporting 9 * documentation, and that the name of SuSE not be used in advertising or 10 * publicity pertaining to distribution of the software without specific, 11 * written prior permission. SuSE makes no representations about the 12 * suitability of this software for any purpose. It is provided "as is" 13 * without express or implied warranty. 14 * 15 * SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE 17 * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 18 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 19 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 20 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 21 */ 22 #ifdef HAVE_CONFIG_H 23 #include <config.h> 24 #endif 25 26 #include "pixman-private.h" 27 28 typedef enum 29 { 30 ARM_V7 = (1 << 0), 31 ARM_V6 = (1 << 1), 32 ARM_VFP = (1 << 2), 33 ARM_NEON = (1 << 3), 34 ARM_IWMMXT = (1 << 4) 35 } arm_cpu_features_t; 36 37 #if defined(USE_ARM_SIMD) || defined(USE_ARM_NEON) || defined(USE_ARM_IWMMXT) 38 39 #if defined(_MSC_VER) 40 41 /* Needed for EXCEPTION_ILLEGAL_INSTRUCTION */ 42 #include <windows.h> 43 44 extern int pixman_msvc_try_arm_neon_op (); 45 extern int pixman_msvc_try_arm_simd_op (); 46 47 static arm_cpu_features_t 48 detect_cpu_features (void) 49 { 50 arm_cpu_features_t features = 0; 51 52 __try 53 { 54 pixman_msvc_try_arm_simd_op (); 55 features |= ARM_V6; 56 } 57 __except (GetExceptionCode () == EXCEPTION_ILLEGAL_INSTRUCTION) 58 { 59 } 60 61 __try 62 { 63 pixman_msvc_try_arm_neon_op (); 64 features |= ARM_NEON; 65 } 66 __except (GetExceptionCode () == EXCEPTION_ILLEGAL_INSTRUCTION) 67 { 68 } 69 70 return features; 71 } 72 73 #elif defined(__APPLE__) && defined(TARGET_OS_IPHONE) /* iOS */ 74 75 #include "TargetConditionals.h" 76 77 static arm_cpu_features_t 78 detect_cpu_features (void) 79 { 80 arm_cpu_features_t features = 0; 81 82 features |= ARM_V6; 83 84 /* Detection of ARM NEON on iOS is fairly simple because iOS binaries 85 * contain separate executable images for each processor architecture. 86 * So all we have to do is detect the armv7 architecture build. The 87 * operating system automatically runs the armv7 binary for armv7 devices 88 * and the armv6 binary for armv6 devices. 89 */ 90 #if defined(__ARM_NEON__) 91 features |= ARM_NEON; 92 #endif 93 94 return features; 95 } 96 97 #elif defined(__ANDROID__) || defined(ANDROID) /* Android */ 98 99 #include <cpu-features.h> 100 101 static arm_cpu_features_t 102 detect_cpu_features (void) 103 { 104 arm_cpu_features_t features = 0; 105 AndroidCpuFamily cpu_family; 106 uint64_t cpu_features; 107 108 cpu_family = android_getCpuFamily(); 109 cpu_features = android_getCpuFeatures(); 110 111 if (cpu_family == ANDROID_CPU_FAMILY_ARM) 112 { 113 if (cpu_features & ANDROID_CPU_ARM_FEATURE_ARMv7) 114 features |= ARM_V7; 115 116 if (cpu_features & ANDROID_CPU_ARM_FEATURE_VFPv3) 117 features |= ARM_VFP; 118 119 if (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON) 120 features |= ARM_NEON; 121 } 122 123 return features; 124 } 125 126 #elif defined (__linux__) /* linux ELF */ 127 128 #include <unistd.h> 129 #include <sys/types.h> 130 #include <sys/stat.h> 131 #include <sys/mman.h> 132 #include <fcntl.h> 133 #include <string.h> 134 #include <elf.h> 135 136 static arm_cpu_features_t 137 detect_cpu_features (void) 138 { 139 arm_cpu_features_t features = 0; 140 Elf32_auxv_t aux; 141 int fd; 142 143 fd = open ("/proc/self/auxv", O_RDONLY); 144 if (fd >= 0) 145 { 146 while (read (fd, &aux, sizeof(Elf32_auxv_t)) == sizeof(Elf32_auxv_t)) 147 { 148 if (aux.a_type == AT_HWCAP) 149 { 150 uint32_t hwcap = aux.a_un.a_val; 151 152 /* hardcode these values to avoid depending on specific 153 * versions of the hwcap header, e.g. HWCAP_NEON 154 */ 155 if ((hwcap & 64) != 0) 156 features |= ARM_VFP; 157 if ((hwcap & 512) != 0) 158 features |= ARM_IWMMXT; 159 /* this flag is only present on kernel 2.6.29 */ 160 if ((hwcap & 4096) != 0) 161 features |= ARM_NEON; 162 } 163 else if (aux.a_type == AT_PLATFORM) 164 { 165 const char *plat = (const char*) aux.a_un.a_val; 166 167 if (strncmp (plat, "v7l", 3) == 0) 168 features |= (ARM_V7 | ARM_V6); 169 else if (strncmp (plat, "v6l", 3) == 0) 170 features |= ARM_V6; 171 } 172 } 173 close (fd); 174 } 175 176 return features; 177 } 178 179 #else /* Unknown */ 180 181 static arm_cpu_features_t 182 detect_cpu_features (void) 183 { 184 return 0; 185 } 186 187 #endif /* Linux elf */ 188 189 static pixman_bool_t 190 have_feature (arm_cpu_features_t feature) 191 { 192 static pixman_bool_t initialized; 193 static arm_cpu_features_t features; 194 195 if (!initialized) 196 { 197 features = detect_cpu_features(); 198 initialized = TRUE; 199 } 200 201 return (features & feature) == feature; 202 } 203 204 #endif /* USE_ARM_SIMD || USE_ARM_NEON || USE_ARM_IWMMXT */ 205 206 pixman_implementation_t * 207 _pixman_arm_get_implementations (pixman_implementation_t *imp) 208 { 209 #ifdef USE_ARM_SIMD 210 if (!_pixman_disabled ("arm-simd") && have_feature (ARM_V6)) 211 imp = _pixman_implementation_create_arm_simd (imp); 212 #endif 213 214 #ifdef USE_ARM_IWMMXT 215 if (!_pixman_disabled ("arm-iwmmxt") && have_feature (ARM_IWMMXT)) 216 imp = _pixman_implementation_create_mmx (imp); 217 #endif 218 219 #ifdef USE_ARM_NEON 220 if (!_pixman_disabled ("arm-neon") && have_feature (ARM_NEON)) 221 imp = _pixman_implementation_create_arm_neon (imp); 222 #endif 223 224 return imp; 225 } 226
