Xuyi Wang / wolfSSL

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wolfcrypt/src/cpuid.c@12:1a06964c2adb, 2017-08-22 (annotated)

Committer:
wolfSSL
Date:
Tue Aug 22 10:47:28 2017 +0000
Revision:
12:1a06964c2adb
wolfSSL 3.12.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
wolfSSL 12:1a06964c2adb 1 /* cpuid.c
wolfSSL 12:1a06964c2adb 2 *
wolfSSL 12:1a06964c2adb 3 * Copyright (C) 2006-2016 wolfSSL Inc.
wolfSSL 12:1a06964c2adb 4 *
wolfSSL 12:1a06964c2adb 5 * This file is part of wolfSSL.
wolfSSL 12:1a06964c2adb 6 *
wolfSSL 12:1a06964c2adb 7 * wolfSSL is free software; you can redistribute it and/or modify
wolfSSL 12:1a06964c2adb 8 * it under the terms of the GNU General Public License as published by
wolfSSL 12:1a06964c2adb 9 * the Free Software Foundation; either version 2 of the License, or
wolfSSL 12:1a06964c2adb 10 * (at your option) any later version.
wolfSSL 12:1a06964c2adb 11 *
wolfSSL 12:1a06964c2adb 12 * wolfSSL is distributed in the hope that it will be useful,
wolfSSL 12:1a06964c2adb 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
wolfSSL 12:1a06964c2adb 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
wolfSSL 12:1a06964c2adb 15 * GNU General Public License for more details.
wolfSSL 12:1a06964c2adb 16 *
wolfSSL 12:1a06964c2adb 17 * You should have received a copy of the GNU General Public License
wolfSSL 12:1a06964c2adb 18 * along with this program; if not, write to the Free Software
wolfSSL 12:1a06964c2adb 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
wolfSSL 12:1a06964c2adb 20 */
wolfSSL 12:1a06964c2adb 21
wolfSSL 12:1a06964c2adb 22
wolfSSL 12:1a06964c2adb 23 #ifdef HAVE_CONFIG_H
wolfSSL 12:1a06964c2adb 24 #include <config.h>
wolfSSL 12:1a06964c2adb 25 #endif
wolfSSL 12:1a06964c2adb 26
wolfSSL 12:1a06964c2adb 27 #include <wolfssl/wolfcrypt/settings.h>
wolfSSL 12:1a06964c2adb 28
wolfSSL 12:1a06964c2adb 29 #include <wolfssl/wolfcrypt/cpuid.h>
wolfSSL 12:1a06964c2adb 30
wolfSSL 12:1a06964c2adb 31 #if defined(WOLFSSL_X86_64_BUILD) || defined(USE_INTEL_SPEEDUP) || \
wolfSSL 12:1a06964c2adb 32 defined(WOLFSSL_AESNI)
wolfSSL 12:1a06964c2adb 33 /* Each platform needs to query info type 1 from cpuid to see if aesni is
wolfSSL 12:1a06964c2adb 34 * supported. Also, let's setup a macro for proper linkage w/o ABI conflicts
wolfSSL 12:1a06964c2adb 35 */
wolfSSL 12:1a06964c2adb 36
wolfSSL 12:1a06964c2adb 37 #ifndef _MSC_VER
wolfSSL 12:1a06964c2adb 38 #define cpuid(reg, leaf, sub)\
wolfSSL 12:1a06964c2adb 39 __asm__ __volatile__ ("cpuid":\
wolfSSL 12:1a06964c2adb 40 "=a" (reg[0]), "=b" (reg[1]), "=c" (reg[2]), "=d" (reg[3]) :\
wolfSSL 12:1a06964c2adb 41 "a" (leaf), "c"(sub));
wolfSSL 12:1a06964c2adb 42
wolfSSL 12:1a06964c2adb 43 #define XASM_LINK(f) asm(f)
wolfSSL 12:1a06964c2adb 44 #else
wolfSSL 12:1a06964c2adb 45 #include <intrin.h>
wolfSSL 12:1a06964c2adb 46
wolfSSL 12:1a06964c2adb 47 #define cpuid(a,b) __cpuid((int*)a,b)
wolfSSL 12:1a06964c2adb 48
wolfSSL 12:1a06964c2adb 49 #define XASM_LINK(f)
wolfSSL 12:1a06964c2adb 50 #endif /* _MSC_VER */
wolfSSL 12:1a06964c2adb 51
wolfSSL 12:1a06964c2adb 52 #define EAX 0
wolfSSL 12:1a06964c2adb 53 #define EBX 1
wolfSSL 12:1a06964c2adb 54 #define ECX 2
wolfSSL 12:1a06964c2adb 55 #define EDX 3
wolfSSL 12:1a06964c2adb 56
wolfSSL 12:1a06964c2adb 57 static word32 cpuid_check = 0;
wolfSSL 12:1a06964c2adb 58 static word32 cpuid_flags = 0;
wolfSSL 12:1a06964c2adb 59
wolfSSL 12:1a06964c2adb 60 static word32 cpuid_flag(word32 leaf, word32 sub, word32 num, word32 bit)
wolfSSL 12:1a06964c2adb 61 {
wolfSSL 12:1a06964c2adb 62 int got_intel_cpu = 0;
wolfSSL 12:1a06964c2adb 63 unsigned int reg[5];
wolfSSL 12:1a06964c2adb 64
wolfSSL 12:1a06964c2adb 65 reg[4] = '\0';
wolfSSL 12:1a06964c2adb 66 cpuid(reg, 0, 0);
wolfSSL 12:1a06964c2adb 67 if (XMEMCMP((char *)&(reg[EBX]), "Genu", 4) == 0 &&
wolfSSL 12:1a06964c2adb 68 XMEMCMP((char *)&(reg[EDX]), "ineI", 4) == 0 &&
wolfSSL 12:1a06964c2adb 69 XMEMCMP((char *)&(reg[ECX]), "ntel", 4) == 0) {
wolfSSL 12:1a06964c2adb 70 got_intel_cpu = 1;
wolfSSL 12:1a06964c2adb 71 }
wolfSSL 12:1a06964c2adb 72 if (got_intel_cpu) {
wolfSSL 12:1a06964c2adb 73 cpuid(reg, leaf, sub);
wolfSSL 12:1a06964c2adb 74 return ((reg[num] >> bit) & 0x1);
wolfSSL 12:1a06964c2adb 75 }
wolfSSL 12:1a06964c2adb 76 return 0;
wolfSSL 12:1a06964c2adb 77 }
wolfSSL 12:1a06964c2adb 78
wolfSSL 12:1a06964c2adb 79
wolfSSL 12:1a06964c2adb 80 void cpuid_set_flags(void)
wolfSSL 12:1a06964c2adb 81 {
wolfSSL 12:1a06964c2adb 82 if (!cpuid_check) {
wolfSSL 12:1a06964c2adb 83 if (cpuid_flag(1, 0, ECX, 28)) { cpuid_flags |= CPUID_AVX1 ; }
wolfSSL 12:1a06964c2adb 84 if (cpuid_flag(7, 0, EBX, 5)) { cpuid_flags |= CPUID_AVX2 ; }
wolfSSL 12:1a06964c2adb 85 if (cpuid_flag(7, 0, EBX, 8)) { cpuid_flags |= CPUID_BMI2 ; }
wolfSSL 12:1a06964c2adb 86 if (cpuid_flag(1, 0, ECX, 30)) { cpuid_flags |= CPUID_RDRAND; }
wolfSSL 12:1a06964c2adb 87 if (cpuid_flag(7, 0, EBX, 18)) { cpuid_flags |= CPUID_RDSEED; }
wolfSSL 12:1a06964c2adb 88 if (cpuid_flag(1, 0, ECX, 26)) { cpuid_flags |= CPUID_AESNI ; }
wolfSSL 12:1a06964c2adb 89 cpuid_check = 1;
wolfSSL 12:1a06964c2adb 90 }
wolfSSL 12:1a06964c2adb 91 }
wolfSSL 12:1a06964c2adb 92
wolfSSL 12:1a06964c2adb 93 word32 cpuid_get_flags(void)
wolfSSL 12:1a06964c2adb 94 {
wolfSSL 12:1a06964c2adb 95 if (!cpuid_check)
wolfSSL 12:1a06964c2adb 96 cpuid_set_flags();
wolfSSL 12:1a06964c2adb 97 return cpuid_flags;
wolfSSL 12:1a06964c2adb 98 }
wolfSSL 12:1a06964c2adb 99 #endif
wolfSSL 12:1a06964c2adb 100
wolfSSL 12:1a06964c2adb 101