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 <openssl/cpu.h>
16
17 #if defined(OPENSSL_AARCH64) && !defined(OPENSSL_STATIC_ARMCAP)
18
19 #include <sys/auxv.h>
20
21 #include <openssl/arm_arch.h>
22
23 #include "internal.h"
24
25
26 extern uint32_t OPENSSL_armcap_P;
27
OPENSSL_cpuid_setup(void)28 void OPENSSL_cpuid_setup(void) {
29 unsigned long hwcap = getauxval(AT_HWCAP);
30
31 /* See /usr/include/asm/hwcap.h on an aarch64 installation for the source of
32 * these values. */
33 static const unsigned long kNEON = 1 << 1;
34 static const unsigned long kAES = 1 << 3;
35 static const unsigned long kPMULL = 1 << 4;
36 static const unsigned long kSHA1 = 1 << 5;
37 static const unsigned long kSHA256 = 1 << 6;
38
39 if ((hwcap & kNEON) == 0) {
40 /* Matching OpenSSL, if NEON is missing, don't report other features
41 * either. */
42 return;
43 }
44
45 OPENSSL_armcap_P |= ARMV7_NEON;
46
47 if (hwcap & kAES) {
48 OPENSSL_armcap_P |= ARMV8_AES;
49 }
50 if (hwcap & kPMULL) {
51 OPENSSL_armcap_P |= ARMV8_PMULL;
52 }
53 if (hwcap & kSHA1) {
54 OPENSSL_armcap_P |= ARMV8_SHA1;
55 }
56 if (hwcap & kSHA256) {
57 OPENSSL_armcap_P |= ARMV8_SHA256;
58 }
59 }
60
61 #endif /* OPENSSL_AARCH64 && !OPENSSL_STATIC_ARMCAP */
62