pixman-arm.c (5894B)
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 <pixman-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_cpu_features_t; 35 36 #if defined(USE_ARM_SIMD) || defined(USE_ARM_NEON) 37 38 #if defined(_MSC_VER) 39 40 /* Needed for EXCEPTION_ILLEGAL_INSTRUCTION */ 41 #include <windows.h> 42 43 extern int pixman_msvc_try_arm_neon_op (); 44 extern int pixman_msvc_try_arm_simd_op (); 45 46 static arm_cpu_features_t 47 detect_cpu_features (void) 48 { 49 arm_cpu_features_t features = 0; 50 51 __try 52 { 53 pixman_msvc_try_arm_simd_op (); 54 features |= ARM_V6; 55 } 56 __except (GetExceptionCode () == EXCEPTION_ILLEGAL_INSTRUCTION) 57 { 58 } 59 60 __try 61 { 62 pixman_msvc_try_arm_neon_op (); 63 features |= ARM_NEON; 64 } 65 __except (GetExceptionCode () == EXCEPTION_ILLEGAL_INSTRUCTION) 66 { 67 } 68 69 return features; 70 } 71 72 #elif defined(__APPLE__) && defined(TARGET_OS_IPHONE) /* iOS */ 73 74 #include "TargetConditionals.h" 75 76 static arm_cpu_features_t 77 detect_cpu_features (void) 78 { 79 arm_cpu_features_t features = 0; 80 81 features |= ARM_V6; 82 83 /* Detection of ARM NEON on iOS is fairly simple because iOS binaries 84 * contain separate executable images for each processor architecture. 85 * So all we have to do is detect the armv7 architecture build. The 86 * operating system automatically runs the armv7 binary for armv7 devices 87 * and the armv6 binary for armv6 devices. 88 */ 89 #if defined(__ARM_NEON__) 90 features |= ARM_NEON; 91 #endif 92 93 return features; 94 } 95 96 #elif defined(__ANDROID__) || defined(ANDROID) /* Android */ 97 98 #include <cpu-features.h> 99 100 static arm_cpu_features_t 101 detect_cpu_features (void) 102 { 103 arm_cpu_features_t features = 0; 104 AndroidCpuFamily cpu_family; 105 uint64_t cpu_features; 106 107 cpu_family = android_getCpuFamily(); 108 cpu_features = android_getCpuFeatures(); 109 110 if (cpu_family == ANDROID_CPU_FAMILY_ARM) 111 { 112 if (cpu_features & ANDROID_CPU_ARM_FEATURE_ARMv7) 113 features |= ARM_V7; 114 115 if (cpu_features & ANDROID_CPU_ARM_FEATURE_VFPv3) 116 features |= ARM_VFP; 117 118 if (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON) 119 features |= ARM_NEON; 120 } 121 122 return features; 123 } 124 125 #elif defined (__linux__) /* linux ELF */ 126 127 #include <unistd.h> 128 #include <sys/types.h> 129 #include <sys/stat.h> 130 #include <sys/mman.h> 131 #include <fcntl.h> 132 #include <string.h> 133 #include <elf.h> 134 135 static arm_cpu_features_t 136 detect_cpu_features (void) 137 { 138 arm_cpu_features_t features = 0; 139 Elf32_auxv_t aux; 140 int fd; 141 142 fd = open ("/proc/self/auxv", O_RDONLY); 143 if (fd >= 0) 144 { 145 while (read (fd, &aux, sizeof(Elf32_auxv_t)) == sizeof(Elf32_auxv_t)) 146 { 147 if (aux.a_type == AT_HWCAP) 148 { 149 uint32_t hwcap = aux.a_un.a_val; 150 151 /* hardcode these values to avoid depending on specific 152 * versions of the hwcap header, e.g. HWCAP_NEON 153 */ 154 if ((hwcap & 64) != 0) 155 features |= ARM_VFP; 156 /* this flag is only present on kernel 2.6.29 */ 157 if ((hwcap & 4096) != 0) 158 features |= ARM_NEON; 159 } 160 else if (aux.a_type == AT_PLATFORM) 161 { 162 const char *plat = (const char*) aux.a_un.a_val; 163 164 if (strncmp (plat, "v7l", 3) == 0) 165 features |= (ARM_V7 | ARM_V6); 166 else if (strncmp (plat, "v6l", 3) == 0) 167 features |= ARM_V6; 168 } 169 } 170 close (fd); 171 } 172 173 return features; 174 } 175 176 #elif defined (_3DS) /* 3DS homebrew (devkitARM) */ 177 178 static arm_cpu_features_t 179 detect_cpu_features (void) 180 { 181 arm_cpu_features_t features = 0; 182 183 features |= ARM_V6; 184 185 return features; 186 } 187 188 #elif defined (PSP2) || defined (__SWITCH__) 189 /* Vita (VitaSDK) or Switch (devkitA64) homebrew */ 190 191 static arm_cpu_features_t 192 detect_cpu_features (void) 193 { 194 arm_cpu_features_t features = 0; 195 196 features |= ARM_NEON; 197 198 return features; 199 } 200 201 #else /* Unknown */ 202 203 static arm_cpu_features_t 204 detect_cpu_features (void) 205 { 206 return 0; 207 } 208 209 #endif /* Linux elf */ 210 211 static pixman_bool_t 212 have_feature (arm_cpu_features_t feature) 213 { 214 static pixman_bool_t initialized; 215 static arm_cpu_features_t features; 216 217 if (!initialized) 218 { 219 features = detect_cpu_features(); 220 initialized = TRUE; 221 } 222 223 return (features & feature) == feature; 224 } 225 226 #endif /* USE_ARM_SIMD || USE_ARM_NEON */ 227 228 pixman_implementation_t * 229 _pixman_arm_get_implementations (pixman_implementation_t *imp) 230 { 231 #ifdef USE_ARM_SIMD 232 if (!_pixman_disabled ("arm-simd") && have_feature (ARM_V6)) 233 imp = _pixman_implementation_create_arm_simd (imp); 234 #endif 235 236 #ifdef USE_ARM_NEON 237 if (!_pixman_disabled ("arm-neon") && have_feature (ARM_NEON)) 238 imp = _pixman_implementation_create_arm_neon (imp); 239 #endif 240 241 #ifdef USE_ARM_A64_NEON 242 /* neon is a part of aarch64 */ 243 if (!_pixman_disabled ("arm-neon")) 244 imp = _pixman_implementation_create_arm_neon (imp); 245 #endif 246 247 return imp; 248 }