/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.] */

#include <openssl/cpu.h>

#if defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64)

#include <inttypes.h>
#include <stdio.h>
#include <sys/auxv.h>

#include "arm_arch.h"


char CRYPTO_is_NEON_capable(void) {
  return (OPENSSL_armcap_P & ARMV7_NEON) != 0;
}

void CRYPTO_set_NEON_capable(char neon_capable) {
  if (neon_capable) {
    OPENSSL_armcap_P |= ARMV7_NEON;
  } else {
    OPENSSL_armcap_P &= ~ARMV7_NEON;
  }
}

char CRYPTO_is_NEON_functional(void) {
  static const uint32_t kWantFlags = ARMV7_NEON | ARMV7_NEON_FUNCTIONAL;
  return (OPENSSL_armcap_P & kWantFlags) == kWantFlags;
}

void CRYPTO_set_NEON_functional(char neon_functional) {
  if (neon_functional) {
    OPENSSL_armcap_P |= ARMV7_NEON_FUNCTIONAL;
  } else {
    OPENSSL_armcap_P &= ~ARMV7_NEON_FUNCTIONAL;
  }
}

void OPENSSL_cpuid_setup(void) {
  unsigned long hwcap = getauxval(AT_HWCAP);

#if defined(OPENSSL_ARM)
  static const unsigned long kNEON = 1 << 12;
  if ((hwcap & kNEON) == 0) {
    return;
  }

  /* In 32-bit mode, the ARMv8 feature bits are in a different aux vector
   * value. */
  hwcap = getauxval(AT_HWCAP2);

  /* See /usr/include/asm/hwcap.h on an ARM installation for the source of
   * these values. */
  static const unsigned long kAES = 1 << 0;
  static const unsigned long kPMULL = 1 << 1;
  static const unsigned long kSHA1 = 1 << 2;
  static const unsigned long kSHA256 = 1 << 3;
#elif defined(OPENSSL_AARCH64)
  /* 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) {
    return;
  }
#endif

  OPENSSL_armcap_P |= ARMV7_NEON | ARMV7_NEON_FUNCTIONAL;

  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  /* defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64) */