108 lines
2.7 KiB
C
108 lines
2.7 KiB
C
/* XMRig
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* Copyright 2010 Jeff Garzik <jgarzik@pobox.com>
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* Copyright 2012-2014 pooler <pooler@litecoinpool.org>
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* Copyright 2014 Lucas Jones <https://github.com/lucasjones>
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* Copyright 2014-2016 Wolf9466 <https://github.com/OhGodAPet>
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* Copyright 2016 Jay D Dee <jayddee246@gmail.com>
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* Copyright 2016-2017 XMRig <support@xmrig.com>
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*
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <cpuid.h>
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#include <string.h>
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#include <stdbool.h>
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#include "cpu.h"
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#define VENDOR_ID (0)
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#define PROCESSOR_INFO (1)
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#define CACHE_TLB_DESCRIPTOR (2)
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#define EXTENDED_FEATURES (7)
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#define PROCESSOR_BRAND_STRING_1 (0x80000002)
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#define PROCESSOR_BRAND_STRING_2 (0x80000003)
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#define PROCESSOR_BRAND_STRING_3 (0x80000004)
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#define EAX_Reg (0)
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#define EBX_Reg (1)
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#define ECX_Reg (2)
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#define EDX_Reg (3)
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static inline void cpuid(int level, int output[4]) {
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int a, b, c, d;
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__cpuid_count(level, 0, a, b, c, d);
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output[0] = a;
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output[1] = b;
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output[2] = c;
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output[3] = d;
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}
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static void cpu_brand_string(char* s) {
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int cpu_info[4] = { 0 };
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cpuid(VENDOR_ID, cpu_info);
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if (cpu_info[EAX_Reg] >= 4) {
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for (int i = 0; i < 4; i++) {
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cpuid(0x80000002 + i, cpu_info);
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memcpy(s, cpu_info, sizeof(cpu_info));
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s += 16;
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}
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}
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}
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static bool has_aes_ni()
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{
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int cpu_info[4] = { 0 };
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cpuid(PROCESSOR_INFO, cpu_info);
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return cpu_info[ECX_Reg] & bit_AES;
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}
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static bool has_bmi2() {
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int cpu_info[4] = { 0 };
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cpuid(EXTENDED_FEATURES, cpu_info);
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return cpu_info[EBX_Reg] & bit_BMI2;
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}
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void cpu_init_common() {
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cpu_info.sockets = 1;
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cpu_brand_string(cpu_info.brand);
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# ifdef __x86_64__
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cpu_info.flags |= CPU_FLAG_X86_64;
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# endif
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if (has_aes_ni()) {
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cpu_info.flags |= CPU_FLAG_AES;
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}
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if (has_bmi2()) {
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cpu_info.flags |= CPU_FLAG_BMI2;
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}
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}
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int get_optimal_threads_count(int algo, bool double_hash, int max_cpu_usage) {
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int count = cpu_info.total_logical_cpus / 2;
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return count < 1 ? 1 : count;
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}
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