|
- /* Copyright (c) 2014, 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 <openssl/cpu.h>
-
- #if defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64)
-
- #include <inttypes.h>
- #include <stdio.h>
-
- #include "arm_arch.h"
-
-
- /* We can't include <sys/auxv.h> because the Android SDK version against which
- * Chromium builds is too old to have it. Instead we define all the constants
- * that we need and have a weak pointer to getauxval. */
-
- unsigned long getauxval(unsigned long type) __attribute__((weak));
-
- static const unsigned long AT_HWCAP = 16;
- static const unsigned long AT_HWCAP2 = 26;
-
- 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) {
- if (getauxval == NULL) {
- return;
- }
-
- 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) */
|