1/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to.  The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 *    notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 *    notice, this list of conditions and the following disclaimer in the
29 *    documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 *    must display the following acknowledgement:
32 *    "This product includes cryptographic software written by
33 *     Eric Young (eay@cryptsoft.com)"
34 *    The word 'cryptographic' can be left out if the rouines from the library
35 *    being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 *    the apps directory (application code) you must include an acknowledgement:
38 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed.  i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57#if !defined(__STDC_FORMAT_MACROS)
58#define __STDC_FORMAT_MACROS
59#endif
60
61#include <openssl/cpu.h>
62
63
64#if !defined(OPENSSL_NO_ASM) && (defined(OPENSSL_X86) || defined(OPENSSL_X86_64))
65
66#include <stdio.h>
67#include <inttypes.h>
68
69/* This value must be explicitly initialised to zero in order to work around a
70 * bug in libtool or the linker on OS X.
71 *
72 * If not initialised then it becomes a "common symbol". When put into an
73 * archive, linking on OS X will fail to resolve common symbols. By
74 * initialising it to zero, it becomes a "data symbol", which isn't so
75 * affected. */
76uint32_t OPENSSL_ia32cap_P[4] = {0};
77
78/* OPENSSL_ia32_cpuid is defined in cpu-x86_64-asm.pl. */
79extern uint64_t OPENSSL_ia32_cpuid(uint32_t*);
80
81/* handle_cpu_env applies the value from |in| to the CPUID values in |out[0]|
82 * and |out[1]|. See the comment in |OPENSSL_cpuid_setup| about this. */
83static void handle_cpu_env(uint32_t *out, const char *in) {
84  const int invert = in[0] == '~';
85  uint64_t v;
86
87  if (!sscanf(in + invert, "%" PRIi64, &v)) {
88    return;
89  }
90
91  if (invert) {
92    out[0] &= ~v;
93    out[1] &= ~(v >> 32);
94  } else {
95    out[0] = v;
96    out[1] = v >> 32;
97  }
98}
99
100void OPENSSL_cpuid_setup(void) {
101  const char *env1, *env2;
102
103#if defined(OPENSSL_X86_64)
104  OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P);
105#else
106  uint64_t vec = OPENSSL_ia32_cpuid(OPENSSL_ia32cap_P);
107  /* 1<<10 sets a reserved bit to indicate that the variable
108   * was already initialised. */
109  OPENSSL_ia32cap_P[0] = ((uint32_t)vec) | (1 << 10);
110  OPENSSL_ia32cap_P[1] = vec >> 32;
111#endif
112
113  env1 = getenv("OPENSSL_ia32cap");
114  if (env1 == NULL) {
115    return;
116  }
117
118  /* OPENSSL_ia32cap can contain zero, one or two values, separated with a ':'.
119   * Each value is a 64-bit, unsigned value which may start with "0x" to
120   * indicate a hex value. Prior to the 64-bit value, a '~' may be given.
121   *
122   * If '~' isn't present, then the value is taken as the result of the CPUID.
123   * Otherwise the value is inverted and ANDed with the probed CPUID result.
124   *
125   * The first value determines OPENSSL_ia32cap_P[0] and [1]. The second [2]
126   * and [3]. */
127
128  handle_cpu_env(&OPENSSL_ia32cap_P[0], env1);
129  env2 = strchr(env1, ':');
130  if (env2 != NULL) {
131    handle_cpu_env(&OPENSSL_ia32cap_P[2], env2 + 1);
132  }
133}
134
135#endif  /* !OPENSSL_NO_ASM && (OPENSSL_X86 || OPENSSL_X86_64) */
136