1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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. */ 76 uint32_t OPENSSL_ia32cap_P[4] = {0}; 77 78 /* OPENSSL_ia32_cpuid is defined in cpu-x86_64-asm.pl. */ 79 extern 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. */ 83 static 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 } 99 100 void 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
