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- /* cpuid.c
- *
- * Copyright (C) 2006-2022 wolfSSL Inc.
- *
- * This file is part of wolfSSL.
- *
- * wolfSSL is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * wolfSSL is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
- */
- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
- #include <wolfssl/wolfcrypt/settings.h>
- #include <wolfssl/wolfcrypt/cpuid.h>
- #if defined(HAVE_CPUID) || defined(HAVE_CPUID_INTEL)
- static word32 cpuid_check = 0;
- static word32 cpuid_flags = 0;
- #endif
- #ifdef HAVE_CPUID_INTEL
- /* Each platform needs to query info type 1 from cpuid to see if aesni is
- * supported. Also, let's setup a macro for proper linkage w/o ABI conflicts
- */
- #ifndef _MSC_VER
- #define cpuid(reg, leaf, sub)\
- __asm__ __volatile__ ("cpuid":\
- "=a" ((reg)[0]), "=b" ((reg)[1]), "=c" ((reg)[2]), "=d" ((reg)[3]) :\
- "a" (leaf), "c"(sub));
- #define XASM_LINK(f) asm(f)
- #else
- #include <intrin.h>
- #define cpuid(a,b,c) __cpuidex((int*)a,b,c)
- #define XASM_LINK(f)
- #endif /* _MSC_VER */
- #define EAX 0
- #define EBX 1
- #define ECX 2
- #define EDX 3
- static word32 cpuid_flag(word32 leaf, word32 sub, word32 num, word32 bit)
- {
- int got_intel_cpu = 0;
- int got_amd_cpu = 0;
- unsigned int reg[5];
- reg[4] = '\0';
- cpuid(reg, 0, 0);
- /* check for Intel cpu */
- if (XMEMCMP((char *)&(reg[EBX]), "Genu", 4) == 0 &&
- XMEMCMP((char *)&(reg[EDX]), "ineI", 4) == 0 &&
- XMEMCMP((char *)&(reg[ECX]), "ntel", 4) == 0) {
- got_intel_cpu = 1;
- }
- /* check for AMD cpu */
- if (XMEMCMP((char *)&(reg[EBX]), "Auth", 4) == 0 &&
- XMEMCMP((char *)&(reg[EDX]), "enti", 4) == 0 &&
- XMEMCMP((char *)&(reg[ECX]), "cAMD", 4) == 0) {
- got_amd_cpu = 1;
- }
- if (got_intel_cpu || got_amd_cpu) {
- cpuid(reg, leaf, sub);
- return ((reg[num] >> bit) & 0x1);
- }
- return 0;
- }
- void cpuid_set_flags(void)
- {
- if (!cpuid_check) {
- if (cpuid_flag(1, 0, ECX, 28)) { cpuid_flags |= CPUID_AVX1 ; }
- if (cpuid_flag(7, 0, EBX, 5)) { cpuid_flags |= CPUID_AVX2 ; }
- if (cpuid_flag(7, 0, EBX, 8)) { cpuid_flags |= CPUID_BMI2 ; }
- if (cpuid_flag(1, 0, ECX, 30)) { cpuid_flags |= CPUID_RDRAND; }
- if (cpuid_flag(7, 0, EBX, 18)) { cpuid_flags |= CPUID_RDSEED; }
- if (cpuid_flag(1, 0, ECX, 25)) { cpuid_flags |= CPUID_AESNI ; }
- if (cpuid_flag(7, 0, EBX, 19)) { cpuid_flags |= CPUID_ADX ; }
- if (cpuid_flag(1, 0, ECX, 22)) { cpuid_flags |= CPUID_MOVBE ; }
- if (cpuid_flag(7, 0, EBX, 3)) { cpuid_flags |= CPUID_BMI1 ; }
- cpuid_check = 1;
- }
- }
- #elif defined(HAVE_CPUID)
- void cpuid_set_flags(void)
- {
- if (!cpuid_check) {
- cpuid_flags = 0;
- cpuid_check = 1;
- }
- }
- #endif
- #ifdef HAVE_CPUID
- word32 cpuid_get_flags(void)
- {
- if (!cpuid_check)
- cpuid_set_flags();
- return cpuid_flags;
- }
- void cpuid_select_flags(word32 flags)
- {
- cpuid_flags = flags;
- }
- void cpuid_set_flag(word32 flag)
- {
- cpuid_flags |= flag;
- }
- void cpuid_clear_flag(word32 flag)
- {
- cpuid_flags &= ~flag;
- }
- #endif /* HAVE_CPUID */
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