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author | Adam Langley <agl@google.com> | 2015-01-22 14:27:53 -0800 |
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committer | Adam Langley <agl@google.com> | 2015-01-30 16:52:14 -0800 |
commit | d9e397b599b13d642138480a28c14db7a136bf05 (patch) | |
tree | 34bab61dc4ce323b123ad4614dbc07e86ea2f9ef /src/crypto/cpu-arm.c | |
download | external_boringssl-d9e397b599b13d642138480a28c14db7a136bf05.zip external_boringssl-d9e397b599b13d642138480a28c14db7a136bf05.tar.gz external_boringssl-d9e397b599b13d642138480a28c14db7a136bf05.tar.bz2 |
Initial commit of BoringSSL for Android.
Diffstat (limited to 'src/crypto/cpu-arm.c')
-rw-r--r-- | src/crypto/cpu-arm.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/src/crypto/cpu-arm.c b/src/crypto/cpu-arm.c new file mode 100644 index 0000000..96392d8 --- /dev/null +++ b/src/crypto/cpu-arm.c @@ -0,0 +1,112 @@ +/* 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) */ |