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_LINUX) && \
18 !defined(OPENSSL_STATIC_ARMCAP)
19
20#include <sys/auxv.h>
21
22#include <openssl/arm_arch.h>
23
24#include "internal.h"
25
26
27extern uint32_t OPENSSL_armcap_P;
28
29void OPENSSL_cpuid_setup(void) {
30 unsigned long hwcap = getauxval(AT_HWCAP);
31
32 // See /usr/include/asm/hwcap.h on an aarch64 installation for the source of
33 // these values.
34 static const unsigned long kNEON = 1 << 1;
35 static const unsigned long kAES = 1 << 3;
36 static const unsigned long kPMULL = 1 << 4;
37 static const unsigned long kSHA1 = 1 << 5;
38 static const unsigned long kSHA256 = 1 << 6;
39
40 if ((hwcap & kNEON) == 0) {
41 // Matching OpenSSL, if NEON is missing, don't report other features
42 // either.
43 return;
44 }
45
46 OPENSSL_armcap_P |= ARMV7_NEON;
47
48 if (hwcap & kAES) {
49 OPENSSL_armcap_P |= ARMV8_AES;
50 }
51 if (hwcap & kPMULL) {
52 OPENSSL_armcap_P |= ARMV8_PMULL;
53 }
54 if (hwcap & kSHA1) {
55 OPENSSL_armcap_P |= ARMV8_SHA1;
56 }
57 if (hwcap & kSHA256) {
58 OPENSSL_armcap_P |= ARMV8_SHA256;
59 }
60}
61
62#endif // OPENSSL_AARCH64 && !OPENSSL_STATIC_ARMCAP
63