text: /* Copyright (c) 2016, Google Inc.
   *
   * Permission to use, copy, modify, and/or distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
   * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
   * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
   * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
  
  #include <CBoringSSL_cpu.h>
  
  #if defined(OPENSSL_AARCH64) && defined(OPENSSL_LINUX) && \
      !defined(OPENSSL_STATIC_ARMCAP)
  
  #include <sys/auxv.h>
  
  #include <CBoringSSL_arm_arch.h>
  
  #include "internal.h"
  
  
  extern uint32_t OPENSSL_armcap_P;
  
  void OPENSSL_cpuid_setup(void) {
    unsigned long hwcap = getauxval(AT_HWCAP);
  
    // See /usr/include/asm/hwcap.h on an aarch64 installation for the source of
    // these values.
    static const unsigned long kNEON = 1 << 1;
    static const unsigned long kAES = 1 << 3;
    static const unsigned long kPMULL = 1 << 4;
    static const unsigned long kSHA1 = 1 << 5;
    static const unsigned long kSHA256 = 1 << 6;
  
    if ((hwcap & kNEON) == 0) {
      // Matching OpenSSL, if NEON is missing, don't report other features
      // either.
      return;
    }
  
    OPENSSL_armcap_P |= ARMV7_NEON;
  
    if (hwcap & kAES) {
      OPENSSL_armcap_P |= ARMV8_AES;
    }
    if (hwcap & kPMULL) {
      OPENSSL_armcap_P |= ARMV8_PMULL;
    }
    if (hwcap & kSHA1) {
      OPENSSL_armcap_P |= ARMV8_SHA1;
    }
    if (hwcap & kSHA256) {
      OPENSSL_armcap_P |= ARMV8_SHA256;
    }
  }
  
  #endif  // OPENSSL_AARCH64 && !OPENSSL_STATIC_ARMCAP
  