1 /* Copyright (c) 2016, Google Inc.
2 *
3 * Permission to use, copy, modify, and/or distribute this software for any
4 * purpose with or without fee is hereby granted, provided that the above
5 * copyright notice and this permission notice appear in all copies.
6 *
7 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
8 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
10 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
12 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
13 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
14
15 #include "internal.h"
16
17 #if defined(OPENSSL_AARCH64) && defined(OPENSSL_LINUX) && \
18 !defined(OPENSSL_STATIC_ARMCAP)
19
20 #include <sys/auxv.h>
21
22 #include <openssl/arm_arch.h>
23
24
OPENSSL_cpuid_setup(void)25 void OPENSSL_cpuid_setup(void) {
26 unsigned long hwcap = getauxval(AT_HWCAP);
27
28 // See /usr/include/asm/hwcap.h on an aarch64 installation for the source of
29 // these values.
30 static const unsigned long kNEON = 1 << 1;
31 static const unsigned long kAES = 1 << 3;
32 static const unsigned long kPMULL = 1 << 4;
33 static const unsigned long kSHA1 = 1 << 5;
34 static const unsigned long kSHA256 = 1 << 6;
35 static const unsigned long kSHA512 = 1 << 21;
36
37 if ((hwcap & kNEON) == 0) {
38 // Matching OpenSSL, if NEON is missing, don't report other features
39 // either.
40 return;
41 }
42
43 OPENSSL_armcap_P |= ARMV7_NEON;
44
45 if (hwcap & kAES) {
46 OPENSSL_armcap_P |= ARMV8_AES;
47 }
48 if (hwcap & kPMULL) {
49 OPENSSL_armcap_P |= ARMV8_PMULL;
50 }
51 if (hwcap & kSHA1) {
52 OPENSSL_armcap_P |= ARMV8_SHA1;
53 }
54 if (hwcap & kSHA256) {
55 OPENSSL_armcap_P |= ARMV8_SHA256;
56 }
57 if (hwcap & kSHA512) {
58 OPENSSL_armcap_P |= ARMV8_SHA512;
59 }
60 }
61
62 #endif // OPENSSL_AARCH64 && OPENSSL_LINUX && !OPENSSL_STATIC_ARMCAP
63