1 #include "../../zbuild.h" 2 3 #if defined(__linux__) && defined(HAVE_SYS_AUXV_H) 4 # include <sys/auxv.h> 5 # ifdef ARM_ASM_HWCAP 6 # include <asm/hwcap.h> 7 # endif 8 #elif defined(__FreeBSD__) && defined(__aarch64__) 9 # include <machine/armreg.h> 10 # ifndef ID_AA64ISAR0_CRC32_VAL 11 # define ID_AA64ISAR0_CRC32_VAL ID_AA64ISAR0_CRC32 12 # endif 13 #elif defined(__APPLE__) 14 # if !defined(_DARWIN_C_SOURCE) 15 # define _DARWIN_C_SOURCE /* enable types aliases (eg u_int) */ 16 # endif 17 # include <sys/sysctl.h> 18 #elif defined(_WIN32) 19 # include <winapifamily.h> 20 #endif 21 arm_has_crc32()22static int arm_has_crc32() { 23 #if defined(__linux__) && defined(ARM_AUXV_HAS_CRC32) 24 # ifdef HWCAP_CRC32 25 return (getauxval(AT_HWCAP) & HWCAP_CRC32) != 0 ? 1 : 0; 26 # else 27 return (getauxval(AT_HWCAP2) & HWCAP2_CRC32) != 0 ? 1 : 0; 28 # endif 29 #elif defined(__FreeBSD__) && defined(__aarch64__) 30 return getenv("QEMU_EMULATING") == NULL 31 && ID_AA64ISAR0_CRC32_VAL(READ_SPECIALREG(id_aa64isar0_el1)) >= ID_AA64ISAR0_CRC32_BASE; 32 #elif defined(__APPLE__) 33 int hascrc32; 34 size_t size = sizeof(hascrc32); 35 return sysctlbyname("hw.optional.armv8_crc32", &hascrc32, &size, NULL, 0) == 0 36 && hascrc32 == 1; 37 #elif defined(ARM_NOCHECK_ACLE) 38 return 1; 39 #else 40 return 0; 41 #endif 42 } 43 44 /* AArch64 has neon. */ 45 #if !defined(__aarch64__) && !defined(_M_ARM64) arm_has_neon()46static inline int arm_has_neon() { 47 #if defined(__linux__) && defined(ARM_AUXV_HAS_NEON) 48 # ifdef HWCAP_ARM_NEON 49 return (getauxval(AT_HWCAP) & HWCAP_ARM_NEON) != 0 ? 1 : 0; 50 # else 51 return (getauxval(AT_HWCAP) & HWCAP_NEON) != 0 ? 1 : 0; 52 # endif 53 #elif defined(__APPLE__) 54 int hasneon; 55 size_t size = sizeof(hasneon); 56 return sysctlbyname("hw.optional.neon", &hasneon, &size, NULL, 0) == 0 57 && hasneon == 1; 58 #elif defined(_M_ARM) && defined(WINAPI_FAMILY_PARTITION) 59 # if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_PHONE_APP) 60 return 1; /* Always supported */ 61 # endif 62 #endif 63 64 #if defined(ARM_NOCHECK_NEON) 65 return 1; 66 #else 67 return 0; 68 #endif 69 } 70 #endif 71 72 Z_INTERNAL int arm_cpu_has_neon; 73 Z_INTERNAL int arm_cpu_has_crc32; 74 arm_check_features(void)75void Z_INTERNAL arm_check_features(void) { 76 #if defined(__aarch64__) || defined(_M_ARM64) 77 arm_cpu_has_neon = 1; /* always available */ 78 #else 79 arm_cpu_has_neon = arm_has_neon(); 80 #endif 81 arm_cpu_has_crc32 = arm_has_crc32(); 82 } 83