Xuyi Wang / wolfSSL

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wolfcrypt/src/cpuid.c@15:117db924cf7c, 2018-08-18 (annotated)

Committer:
wolfSSL
Date:
Sat Aug 18 22:20:43 2018 +0000
Revision:
15:117db924cf7c
wolfSSL 3.15.3

Who changed what in which revision?

UserRevisionLine numberNew contents of line
wolfSSL 15:117db924cf7c 1 /* cpuid.c
wolfSSL 15:117db924cf7c 2 *
wolfSSL 15:117db924cf7c 3 * Copyright (C) 2006-2017 wolfSSL Inc.
wolfSSL 15:117db924cf7c 4 *
wolfSSL 15:117db924cf7c 5 * This file is part of wolfSSL.
wolfSSL 15:117db924cf7c 6 *
wolfSSL 15:117db924cf7c 7 * wolfSSL is free software; you can redistribute it and/or modify
wolfSSL 15:117db924cf7c 8 * it under the terms of the GNU General Public License as published by
wolfSSL 15:117db924cf7c 9 * the Free Software Foundation; either version 2 of the License, or
wolfSSL 15:117db924cf7c 10 * (at your option) any later version.
wolfSSL 15:117db924cf7c 11 *
wolfSSL 15:117db924cf7c 12 * wolfSSL is distributed in the hope that it will be useful,
wolfSSL 15:117db924cf7c 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
wolfSSL 15:117db924cf7c 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
wolfSSL 15:117db924cf7c 15 * GNU General Public License for more details.
wolfSSL 15:117db924cf7c 16 *
wolfSSL 15:117db924cf7c 17 * You should have received a copy of the GNU General Public License
wolfSSL 15:117db924cf7c 18 * along with this program; if not, write to the Free Software
wolfSSL 15:117db924cf7c 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
wolfSSL 15:117db924cf7c 20 */
wolfSSL 15:117db924cf7c 21
wolfSSL 15:117db924cf7c 22
wolfSSL 15:117db924cf7c 23 #ifdef HAVE_CONFIG_H
wolfSSL 15:117db924cf7c 24 #include <config.h>
wolfSSL 15:117db924cf7c 25 #endif
wolfSSL 15:117db924cf7c 26
wolfSSL 15:117db924cf7c 27 #include <wolfssl/wolfcrypt/settings.h>
wolfSSL 15:117db924cf7c 28
wolfSSL 15:117db924cf7c 29 #include <wolfssl/wolfcrypt/cpuid.h>
wolfSSL 15:117db924cf7c 30
wolfSSL 15:117db924cf7c 31 #if (defined(WOLFSSL_X86_64_BUILD) || defined(USE_INTEL_SPEEDUP) || \
wolfSSL 15:117db924cf7c 32 defined(WOLFSSL_AESNI)) && !defined(WOLFSSL_NO_ASM)
wolfSSL 15:117db924cf7c 33 /* Each platform needs to query info type 1 from cpuid to see if aesni is
wolfSSL 15:117db924cf7c 34 * supported. Also, let's setup a macro for proper linkage w/o ABI conflicts
wolfSSL 15:117db924cf7c 35 */
wolfSSL 15:117db924cf7c 36
wolfSSL 15:117db924cf7c 37 #ifndef _MSC_VER
wolfSSL 15:117db924cf7c 38 #define cpuid(reg, leaf, sub)\
wolfSSL 15:117db924cf7c 39 __asm__ __volatile__ ("cpuid":\
wolfSSL 15:117db924cf7c 40 "=a" (reg[0]), "=b" (reg[1]), "=c" (reg[2]), "=d" (reg[3]) :\
wolfSSL 15:117db924cf7c 41 "a" (leaf), "c"(sub));
wolfSSL 15:117db924cf7c 42
wolfSSL 15:117db924cf7c 43 #define XASM_LINK(f) asm(f)
wolfSSL 15:117db924cf7c 44 #else
wolfSSL 15:117db924cf7c 45 #include <intrin.h>
wolfSSL 15:117db924cf7c 46
wolfSSL 15:117db924cf7c 47 #define cpuid(a,b,c) __cpuidex((int*)a,b,c)
wolfSSL 15:117db924cf7c 48
wolfSSL 15:117db924cf7c 49 #define XASM_LINK(f)
wolfSSL 15:117db924cf7c 50 #endif /* _MSC_VER */
wolfSSL 15:117db924cf7c 51
wolfSSL 15:117db924cf7c 52 #define EAX 0
wolfSSL 15:117db924cf7c 53 #define EBX 1
wolfSSL 15:117db924cf7c 54 #define ECX 2
wolfSSL 15:117db924cf7c 55 #define EDX 3
wolfSSL 15:117db924cf7c 56
wolfSSL 15:117db924cf7c 57 static word32 cpuid_check = 0;
wolfSSL 15:117db924cf7c 58 static word32 cpuid_flags = 0;
wolfSSL 15:117db924cf7c 59
wolfSSL 15:117db924cf7c 60 static word32 cpuid_flag(word32 leaf, word32 sub, word32 num, word32 bit)
wolfSSL 15:117db924cf7c 61 {
wolfSSL 15:117db924cf7c 62 int got_intel_cpu = 0;
wolfSSL 15:117db924cf7c 63 int got_amd_cpu = 0;
wolfSSL 15:117db924cf7c 64 unsigned int reg[5];
wolfSSL 15:117db924cf7c 65 reg[4] = '\0';
wolfSSL 15:117db924cf7c 66 cpuid(reg, 0, 0);
wolfSSL 15:117db924cf7c 67
wolfSSL 15:117db924cf7c 68 /* check for Intel cpu */
wolfSSL 15:117db924cf7c 69 if (XMEMCMP((char *)&(reg[EBX]), "Genu", 4) == 0 &&
wolfSSL 15:117db924cf7c 70 XMEMCMP((char *)&(reg[EDX]), "ineI", 4) == 0 &&
wolfSSL 15:117db924cf7c 71 XMEMCMP((char *)&(reg[ECX]), "ntel", 4) == 0) {
wolfSSL 15:117db924cf7c 72 got_intel_cpu = 1;
wolfSSL 15:117db924cf7c 73 }
wolfSSL 15:117db924cf7c 74
wolfSSL 15:117db924cf7c 75 /* check for AMD cpu */
wolfSSL 15:117db924cf7c 76 if (XMEMCMP((char *)&(reg[EBX]), "Auth", 4) == 0 &&
wolfSSL 15:117db924cf7c 77 XMEMCMP((char *)&(reg[EDX]), "enti", 4) == 0 &&
wolfSSL 15:117db924cf7c 78 XMEMCMP((char *)&(reg[ECX]), "cAMD", 4) == 0) {
wolfSSL 15:117db924cf7c 79 got_amd_cpu = 1;
wolfSSL 15:117db924cf7c 80 }
wolfSSL 15:117db924cf7c 81
wolfSSL 15:117db924cf7c 82 if (got_intel_cpu || got_amd_cpu) {
wolfSSL 15:117db924cf7c 83 cpuid(reg, leaf, sub);
wolfSSL 15:117db924cf7c 84 return ((reg[num] >> bit) & 0x1);
wolfSSL 15:117db924cf7c 85 }
wolfSSL 15:117db924cf7c 86 return 0;
wolfSSL 15:117db924cf7c 87 }
wolfSSL 15:117db924cf7c 88
wolfSSL 15:117db924cf7c 89
wolfSSL 15:117db924cf7c 90 void cpuid_set_flags(void)
wolfSSL 15:117db924cf7c 91 {
wolfSSL 15:117db924cf7c 92 if (!cpuid_check) {
wolfSSL 15:117db924cf7c 93 if (cpuid_flag(1, 0, ECX, 28)) { cpuid_flags |= CPUID_AVX1 ; }
wolfSSL 15:117db924cf7c 94 if (cpuid_flag(7, 0, EBX, 5)) { cpuid_flags |= CPUID_AVX2 ; }
wolfSSL 15:117db924cf7c 95 if (cpuid_flag(7, 0, EBX, 8)) { cpuid_flags |= CPUID_BMI2 ; }
wolfSSL 15:117db924cf7c 96 if (cpuid_flag(1, 0, ECX, 30)) { cpuid_flags |= CPUID_RDRAND; }
wolfSSL 15:117db924cf7c 97 if (cpuid_flag(7, 0, EBX, 18)) { cpuid_flags |= CPUID_RDSEED; }
wolfSSL 15:117db924cf7c 98 if (cpuid_flag(1, 0, ECX, 26)) { cpuid_flags |= CPUID_AESNI ; }
wolfSSL 15:117db924cf7c 99 if (cpuid_flag(7, 0, EBX, 19)) { cpuid_flags |= CPUID_ADX ; }
wolfSSL 15:117db924cf7c 100 cpuid_check = 1;
wolfSSL 15:117db924cf7c 101 }
wolfSSL 15:117db924cf7c 102 }
wolfSSL 15:117db924cf7c 103
wolfSSL 15:117db924cf7c 104 word32 cpuid_get_flags(void)
wolfSSL 15:117db924cf7c 105 {
wolfSSL 15:117db924cf7c 106 if (!cpuid_check)
wolfSSL 15:117db924cf7c 107 cpuid_set_flags();
wolfSSL 15:117db924cf7c 108 return cpuid_flags;
wolfSSL 15:117db924cf7c 109 }
wolfSSL 15:117db924cf7c 110 #endif
wolfSSL 15:117db924cf7c 111