crypto/cpu-arm-linux.h

/* Copyright (c) 2018, 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. */

#ifndef OPENSSL_HEADER_CRYPTO_CPU_ARM_LINUX_H
#define OPENSSL_HEADER_CRYPTO_CPU_ARM_LINUX_H

#include <openssl/base.h>

#if defined(__cplusplus)
extern "C" {
#endif


// The following symbols are defined on all platforms and exported for testing
// and fuzzing purposes. They are not exported from the shared library so the
// static linker will drop them outside of tests.

#define HWCAP_NEON (1 << 12)

// See /usr/include/asm/hwcap.h on an ARM installation for the source of
// these values.
#define HWCAP2_AES (1 << 0)
#define HWCAP2_PMULL (1 << 1)
#define HWCAP2_SHA1 (1 << 2)
#define HWCAP2_SHA2 (1 << 3)

typedef struct {
  const char *data;
  size_t len;
} STRING_PIECE;

// crypto_get_arm_hwcap_from_cpuinfo returns an equivalent ARM |AT_HWCAP| value
// from |cpuinfo|.
unsigned long crypto_get_arm_hwcap_from_cpuinfo(const STRING_PIECE *cpuinfo);

// crypto_get_arm_hwcap2_from_cpuinfo returns an equivalent ARM |AT_HWCAP2|
// value from |cpuinfo|.
unsigned long crypto_get_arm_hwcap2_from_cpuinfo(const STRING_PIECE *cpuinfo);

// crypto_cpuinfo_has_broken_neon returns one if |cpuinfo| matches a CPU known
// to have broken NEON unit and zero otherwise. See https://crbug.com/341598.
int crypto_cpuinfo_has_broken_neon(const STRING_PIECE *cpuinfo);

#if defined(__cplusplus)
}  // extern C
#endif

#endif  // OPENSSL_HEADER_CRYPTO_CPU_ARM_LINUX_H