Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 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 <inttypes.h> |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 67 | #include <stdlib.h> |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 68 | #include <stdio.h> |
| 69 | #include <string.h> |
| 70 | |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame^] | 71 | #if defined(OPENSSL_WINDOWS) |
| 72 | #pragma warning(push, 3) |
| 73 | #include <immintrin.h> |
| 74 | #include <intrin.h> |
| 75 | #pragma warning(pop) |
| 76 | #endif |
| 77 | |
| 78 | |
| 79 | /* OPENSSL_cpuid runs the cpuid instruction. |leaf| is passed in as EAX and ECX |
| 80 | * is set to zero. It writes EAX, EBX, ECX, and EDX to |*out_eax| through |
| 81 | * |*out_edx|. */ |
| 82 | static void OPENSSL_cpuid(uint32_t *out_eax, uint32_t *out_ebx, |
| 83 | uint32_t *out_ecx, uint32_t *out_edx, uint32_t leaf) { |
| 84 | #if defined(OPENSSL_WINDOWS) |
| 85 | int tmp[4]; |
| 86 | __cpuid(tmp, (int)leaf); |
| 87 | *out_eax = (uint32_t)tmp[0]; |
| 88 | *out_ebx = (uint32_t)tmp[1]; |
| 89 | *out_ecx = (uint32_t)tmp[2]; |
| 90 | *out_edx = (uint32_t)tmp[3]; |
| 91 | #elif defined(__pic__) && defined(OPENSSL_32_BIT) |
| 92 | /* Inline assembly may not clobber the PIC register. For 32-bit, this is EBX. |
| 93 | * See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47602. */ |
| 94 | __asm__ volatile ( |
| 95 | "xor %%ecx, %%ecx\n" |
| 96 | "mov %%ebx, %%edi\n" |
| 97 | "cpuid\n" |
| 98 | "xchg %%edi, %%ebx\n" |
| 99 | : "=a"(*out_eax), "=D"(*out_ebx), "=c"(*out_ecx), "=d"(*out_edx) |
| 100 | : "a"(leaf) |
| 101 | ); |
| 102 | #else |
| 103 | __asm__ volatile ( |
| 104 | "xor %%ecx, %%ecx\n" |
| 105 | "cpuid\n" |
| 106 | : "=a"(*out_eax), "=b"(*out_ebx), "=c"(*out_ecx), "=d"(*out_edx) |
| 107 | : "a"(leaf) |
| 108 | ); |
| 109 | #endif |
| 110 | } |
| 111 | |
| 112 | /* OPENSSL_xgetbv returns the value of an Intel Extended Control Register (XCR). |
| 113 | * Currently only XCR0 is defined by Intel so |xcr| should always be zero. */ |
| 114 | static uint64_t OPENSSL_xgetbv(uint32_t xcr) { |
| 115 | #if defined(OPENSSL_WINDOWS) |
| 116 | return (uint64_t)_xgetbv(xcr); |
| 117 | #else |
| 118 | uint32_t eax, edx; |
| 119 | __asm__ volatile ("xgetbv" : "=a"(eax), "=d"(edx) : "c"(xcr)); |
| 120 | return (((uint64_t)edx) << 32) | eax; |
| 121 | #endif |
| 122 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 123 | |
| 124 | /* handle_cpu_env applies the value from |in| to the CPUID values in |out[0]| |
| 125 | * and |out[1]|. See the comment in |OPENSSL_cpuid_setup| about this. */ |
| 126 | static void handle_cpu_env(uint32_t *out, const char *in) { |
| 127 | const int invert = in[0] == '~'; |
| 128 | uint64_t v; |
| 129 | |
| 130 | if (!sscanf(in + invert, "%" PRIi64, &v)) { |
| 131 | return; |
| 132 | } |
| 133 | |
| 134 | if (invert) { |
| 135 | out[0] &= ~v; |
| 136 | out[1] &= ~(v >> 32); |
| 137 | } else { |
| 138 | out[0] = v; |
| 139 | out[1] = v >> 32; |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | void OPENSSL_cpuid_setup(void) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame^] | 144 | /* Determine the vendor and maximum input value. */ |
| 145 | uint32_t eax, ebx, ecx, edx; |
| 146 | OPENSSL_cpuid(&eax, &ebx, &ecx, &edx, 0); |
| 147 | |
| 148 | uint32_t num_ids = eax; |
| 149 | |
| 150 | int is_intel = ebx == 0x756e6547 /* Genu */ && |
| 151 | edx == 0x49656e69 /* ineI */ && |
| 152 | ecx == 0x6c65746e /* ntel */; |
| 153 | int is_amd = ebx == 0x68747541 /* Auth */ && |
| 154 | edx == 0x69746e65 /* enti */ && |
| 155 | ecx == 0x444d4163 /* cAMD */; |
| 156 | |
| 157 | int has_amd_xop = 0; |
| 158 | if (is_amd) { |
| 159 | /* AMD-specific logic. |
| 160 | * See http://developer.amd.com/wordpress/media/2012/10/254811.pdf */ |
| 161 | OPENSSL_cpuid(&eax, &ebx, &ecx, &edx, 0x80000000); |
| 162 | uint32_t num_extended_ids = eax; |
| 163 | if (num_extended_ids >= 0x80000001) { |
| 164 | OPENSSL_cpuid(&eax, &ebx, &ecx, &edx, 0x80000001); |
| 165 | if (ecx & (1 << 11)) { |
| 166 | has_amd_xop = 1; |
| 167 | } |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | uint32_t extended_features = 0; |
| 172 | if (num_ids >= 7) { |
| 173 | OPENSSL_cpuid(&eax, &ebx, &ecx, &edx, 7); |
| 174 | extended_features = ebx; |
| 175 | } |
| 176 | |
| 177 | /* Determine the number of cores sharing an L1 data cache to adjust the |
| 178 | * hyper-threading bit. */ |
| 179 | uint32_t cores_per_cache = 0; |
| 180 | if (is_amd) { |
| 181 | /* AMD CPUs never share an L1 data cache between threads but do set the HTT |
| 182 | * bit on multi-core CPUs. */ |
| 183 | cores_per_cache = 1; |
| 184 | } else if (num_ids >= 4) { |
| 185 | /* TODO(davidben): The Intel manual says this CPUID leaf enumerates all |
| 186 | * caches using ECX and doesn't say which is first. Does this matter? */ |
| 187 | OPENSSL_cpuid(&eax, &ebx, &ecx, &edx, 4); |
| 188 | cores_per_cache = 1 + ((eax >> 14) & 0xfff); |
| 189 | } |
| 190 | |
| 191 | OPENSSL_cpuid(&eax, &ebx, &ecx, &edx, 1); |
| 192 | |
| 193 | /* Adjust the hyper-threading bit. */ |
| 194 | if (edx & (1 << 28)) { |
| 195 | uint32_t num_logical_cores = (ebx >> 16) & 0xff; |
| 196 | if (cores_per_cache == 1 || num_logical_cores <= 1) { |
| 197 | edx &= ~(1 << 28); |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | /* Reserved bit #20 was historically repurposed to control the in-memory |
| 202 | * representation of RC4 state. Always set it to zero. */ |
| 203 | edx &= ~(1 << 20); |
| 204 | |
| 205 | /* Reserved bit #30 is repurposed to signal an Intel CPU. */ |
| 206 | if (is_intel) { |
| 207 | edx |= (1 << 30); |
| 208 | } else { |
| 209 | edx &= ~(1 << 30); |
| 210 | } |
| 211 | |
| 212 | /* The SDBG bit is repurposed to denote AMD XOP support. */ |
| 213 | if (has_amd_xop) { |
| 214 | ecx |= (1 << 11); |
| 215 | } else { |
| 216 | ecx &= ~(1 << 11); |
| 217 | } |
| 218 | |
| 219 | uint64_t xcr0 = 0; |
| 220 | if (ecx & (1 << 27)) { |
| 221 | /* XCR0 may only be queried if the OSXSAVE bit is set. */ |
| 222 | xcr0 = OPENSSL_xgetbv(0); |
| 223 | } |
| 224 | /* See Intel manual, section 14.3. */ |
| 225 | if ((xcr0 & 6) != 6) { |
| 226 | /* YMM registers cannot be used. */ |
| 227 | ecx &= ~(1 << 28); /* AVX */ |
| 228 | ecx &= ~(1 << 12); /* FMA */ |
| 229 | ecx &= ~(1 << 11); /* AMD XOP */ |
| 230 | extended_features &= ~(1 << 5); /* AVX2 */ |
| 231 | } |
| 232 | |
| 233 | OPENSSL_ia32cap_P[0] = edx; |
| 234 | OPENSSL_ia32cap_P[1] = ecx; |
| 235 | OPENSSL_ia32cap_P[2] = extended_features; |
| 236 | OPENSSL_ia32cap_P[3] = 0; |
| 237 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 238 | const char *env1, *env2; |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 239 | env1 = getenv("OPENSSL_ia32cap"); |
| 240 | if (env1 == NULL) { |
| 241 | return; |
| 242 | } |
| 243 | |
| 244 | /* OPENSSL_ia32cap can contain zero, one or two values, separated with a ':'. |
| 245 | * Each value is a 64-bit, unsigned value which may start with "0x" to |
| 246 | * indicate a hex value. Prior to the 64-bit value, a '~' may be given. |
| 247 | * |
| 248 | * If '~' isn't present, then the value is taken as the result of the CPUID. |
| 249 | * Otherwise the value is inverted and ANDed with the probed CPUID result. |
| 250 | * |
| 251 | * The first value determines OPENSSL_ia32cap_P[0] and [1]. The second [2] |
| 252 | * and [3]. */ |
| 253 | |
| 254 | handle_cpu_env(&OPENSSL_ia32cap_P[0], env1); |
| 255 | env2 = strchr(env1, ':'); |
| 256 | if (env2 != NULL) { |
| 257 | handle_cpu_env(&OPENSSL_ia32cap_P[2], env2 + 1); |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | #endif /* !OPENSSL_NO_ASM && (OPENSSL_X86 || OPENSSL_X86_64) */ |