| #include "cpu-features.h" |
| #include "cpu_features_macros.h" |
| #include "internal/filesystem.h" |
| #include "internal/stack_line_reader.h" |
| #include "internal/string_view.h" |
| |
| #include <pthread.h> |
| |
| #if defined(CPU_FEATURES_ARCH_ARM) |
| #include "cpuinfo_arm.h" |
| #elif defined(CPU_FEATURES_ARCH_X86) |
| #include "cpuinfo_x86.h" |
| #elif defined(CPU_FEATURES_ARCH_MIPS) |
| #include "cpuinfo_mips.h" |
| #elif defined(CPU_FEATURES_ARCH_AARCH64) |
| #include "cpuinfo_aarch64.h" |
| #endif |
| |
| static pthread_once_t g_once; |
| static int g_inited; |
| static uint64_t g_cpuFeatures; |
| static int g_cpuCount; |
| |
| #ifdef CPU_FEATURES_ARCH_ARM |
| static uint32_t g_cpuIdArm; |
| #endif |
| |
| static void set_cpu_mask_bit(uint32_t index, uint32_t* cpu_mask) { |
| *cpu_mask |= 1UL << index; |
| } |
| |
| // Examples of valid inputs: "31", "4-31" |
| static void parse_cpu_mask(const StringView text, uint32_t* cpu_mask) { |
| int separator_index = CpuFeatures_StringView_IndexOfChar(text, '-'); |
| if (separator_index < 0) { // A single cpu index |
| int cpu_index = CpuFeatures_StringView_ParsePositiveNumber(text); |
| if (cpu_index < 0) return; |
| set_cpu_mask_bit(cpu_index, cpu_mask); |
| } else { |
| int cpu_index_a = CpuFeatures_StringView_ParsePositiveNumber( |
| CpuFeatures_StringView_KeepFront(text, separator_index)); |
| int cpu_index_b = CpuFeatures_StringView_ParsePositiveNumber( |
| CpuFeatures_StringView_PopFront(text, separator_index + 1)); |
| int i; |
| if (cpu_index_a < 0 || cpu_index_b < 0) return; |
| for (i = cpu_index_a; i <= cpu_index_b; ++i) { |
| if (i < 32) { |
| set_cpu_mask_bit(i, cpu_mask); |
| } |
| } |
| } |
| } |
| |
| // Format specification from |
| // https://www.kernel.org/doc/Documentation/cputopology.txt |
| // Examples of valid inputs: "31", "2,4-31,32-63", "0-1,3" |
| static void parse_cpu_mask_line(const LineResult result, uint32_t* cpu_mask) { |
| if (!result.full_line || result.eof) return; |
| StringView line = result.line; |
| for (; line.size > 0;) { |
| int next_entry_index = CpuFeatures_StringView_IndexOfChar(line, ','); |
| if (next_entry_index < 0) { |
| parse_cpu_mask(line, cpu_mask); |
| break; |
| } |
| StringView entry = CpuFeatures_StringView_KeepFront(line, next_entry_index); |
| parse_cpu_mask(entry, cpu_mask); |
| line = CpuFeatures_StringView_PopFront(line, next_entry_index + 1); |
| } |
| } |
| |
| static void update_cpu_mask_from_file(const char* filename, |
| uint32_t* cpu_mask) { |
| const int fd = CpuFeatures_OpenFile(filename); |
| if (fd >= 0) { |
| StackLineReader reader; |
| StackLineReader_Initialize(&reader, fd); |
| parse_cpu_mask_line(StackLineReader_NextLine(&reader), cpu_mask); |
| CpuFeatures_CloseFile(fd); |
| } |
| } |
| |
| static int get_cpu_count(void) { |
| uint32_t cpu_mask = 0; |
| update_cpu_mask_from_file("/sys/devices/system/cpu/present", &cpu_mask); |
| update_cpu_mask_from_file("/sys/devices/system/cpu/possible", &cpu_mask); |
| return __builtin_popcount(cpu_mask); |
| } |
| |
| static void android_cpuInit(void) { |
| g_cpuFeatures = 0; |
| g_cpuCount = 1; |
| g_inited = 1; |
| |
| g_cpuCount = get_cpu_count(); |
| if (g_cpuCount == 0) { |
| g_cpuCount = 1; |
| } |
| #if defined(CPU_FEATURES_ARCH_ARM) |
| ArmInfo info = GetArmInfo(); |
| if (info.architecture == 7) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_ARMv7; |
| if (info.features.vfpv3) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_VFPv3; |
| if (info.features.neon) { |
| g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_NEON; |
| g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_VFP_D32; |
| } |
| if (info.features.vfpv3d16) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_VFP_FP16; |
| if (info.features.idiva) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_IDIV_ARM; |
| if (info.features.idivt) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_IDIV_THUMB2; |
| if (info.features.iwmmxt) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_iWMMXt; |
| if (info.features.aes) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_AES; |
| if (info.features.pmull) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_PMULL; |
| if (info.features.sha1) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_SHA1; |
| if (info.features.sha2) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_SHA2; |
| if (info.features.crc32) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_CRC32; |
| if (info.architecture >= 6) |
| g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_LDREX_STREX; |
| if (info.features.vfpv) g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_VFPv2; |
| if (info.features.vfpv4) { |
| g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_VFP_FMA; |
| g_cpuFeatures |= ANDROID_CPU_ARM_FEATURE_NEON_FMA; |
| } |
| g_cpuIdArm = GetArmCpuId(&info); |
| #elif defined(CPU_FEATURES_ARCH_X86) |
| X86Info info = GetX86Info(); |
| if (info.features.ssse3) g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_SSSE3; |
| if (info.features.popcnt) g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_POPCNT; |
| if (info.features.movbe) g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_MOVBE; |
| if (info.features.sse4_1) g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_SSE4_1; |
| if (info.features.sse4_2) g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_SSE4_2; |
| if (info.features.aes) g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_AES_NI; |
| if (info.features.avx) g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_AVX; |
| if (info.features.rdrnd) g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_RDRAND; |
| if (info.features.avx2) g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_AVX2; |
| if (info.features.sha) g_cpuFeatures |= ANDROID_CPU_X86_FEATURE_SHA_NI; |
| #elif defined(CPU_FEATURES_ARCH_MIPS) |
| MipsInfo info = GetMipsInfo(); |
| if (info.features.r6) g_cpuFeatures |= ANDROID_CPU_MIPS_FEATURE_R6; |
| if (info.features.msa) g_cpuFeatures |= ANDROID_CPU_MIPS_FEATURE_MSA; |
| #elif defined(CPU_FEATURES_ARCH_AARCH64) |
| Aarch64Info info = GetAarch64Info(); |
| if (info.features.fp) g_cpuFeatures |= ANDROID_CPU_ARM64_FEATURE_FP; |
| if (info.features.asimd) g_cpuFeatures |= ANDROID_CPU_ARM64_FEATURE_ASIMD; |
| if (info.features.aes) g_cpuFeatures |= ANDROID_CPU_ARM64_FEATURE_AES; |
| if (info.features.pmull) g_cpuFeatures |= ANDROID_CPU_ARM64_FEATURE_PMULL; |
| if (info.features.sha1) g_cpuFeatures |= ANDROID_CPU_ARM64_FEATURE_SHA1; |
| if (info.features.sha2) g_cpuFeatures |= ANDROID_CPU_ARM64_FEATURE_SHA2; |
| if (info.features.crc32) g_cpuFeatures |= ANDROID_CPU_ARM64_FEATURE_CRC32; |
| #endif |
| } |
| |
| AndroidCpuFamily android_getCpuFamily(void) { |
| #if defined(CPU_FEATURES_ARCH_ARM) |
| return ANDROID_CPU_FAMILY_ARM; |
| #elif defined(CPU_FEATURES_ARCH_X86_32) |
| return ANDROID_CPU_FAMILY_X86; |
| #elif defined(CPU_FEATURES_ARCH_MIPS64) |
| return ANDROID_CPU_FAMILY_MIPS64; |
| #elif defined(CPU_FEATURES_ARCH_MIPS32) |
| return ANDROID_CPU_FAMILY_MIPS; |
| #elif defined(CPU_FEATURES_ARCH_AARCH64) |
| return ANDROID_CPU_FAMILY_ARM64; |
| #elif defined(CPU_FEATURES_ARCH_X86_64) |
| return ANDROID_CPU_FAMILY_X86_64; |
| #else |
| return ANDROID_CPU_FAMILY_UNKNOWN; |
| #endif |
| } |
| |
| uint64_t android_getCpuFeatures(void) { |
| pthread_once(&g_once, android_cpuInit); |
| return g_cpuFeatures; |
| } |
| |
| int android_getCpuCount(void) { |
| pthread_once(&g_once, android_cpuInit); |
| return g_cpuCount; |
| } |
| |
| static void android_cpuInitDummy(void) { g_inited = 1; } |
| |
| int android_setCpu(int cpu_count, uint64_t cpu_features) { |
| /* Fail if the library was already initialized. */ |
| if (g_inited) return 0; |
| g_cpuCount = (cpu_count <= 0 ? 1 : cpu_count); |
| g_cpuFeatures = cpu_features; |
| pthread_once(&g_once, android_cpuInitDummy); |
| return 1; |
| } |
| |
| #ifdef CPU_FEATURES_ARCH_ARM |
| |
| uint32_t android_getCpuIdArm(void) { |
| pthread_once(&g_once, android_cpuInit); |
| return g_cpuIdArm; |
| } |
| |
| int android_setCpuArm(int cpu_count, uint64_t cpu_features, uint32_t cpu_id) { |
| if (!android_setCpu(cpu_count, cpu_features)) return 0; |
| g_cpuIdArm = cpu_id; |
| return 1; |
| } |
| |
| #endif // CPU_FEATURES_ARCH_ARM |