ceph/src/arch/arm.c

   1 #include "acconfig.h"
   2 #include "arch/probe.h"
   3
   4 /* flags we export */
   5 int ceph_arch_neon = 0;
   6 int ceph_arch_aarch64_crc32 = 0;
   7 int ceph_arch_aarch64_pmull = 0;
   8
   9 #include <stdio.h>
  10
  11 #if __linux__
  12
  13 #include <elf.h>
  14 #include <link.h> // ElfW macro
  15 #include <sys/auxv.h>
  16
  17 #if __arm__ || __aarch64__
  18 #include <asm/hwcap.h>
  19 #endif // __arm__
  20
  21 #endif // __linux__
  22
  23 int ceph_arch_arm_probe(void)
  24 {
  25 #if __linux__
  26         unsigned long hwcap = getauxval(AT_HWCAP);
  27 #if __arm__
  28         ceph_arch_neon = (hwcap & HWCAP_NEON) == HWCAP_NEON;
  29 #elif __aarch64__
  30         ceph_arch_neon = (hwcap & HWCAP_ASIMD) == HWCAP_ASIMD;
  31         ceph_arch_aarch64_crc32 = (hwcap & HWCAP_CRC32) == HWCAP_CRC32;
  32         ceph_arch_aarch64_pmull = (hwcap & HWCAP_PMULL) == HWCAP_PMULL;
  33 #endif
  34 #endif // __linux__
  35         return 0;
  36 }
  37