/*
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* cpu_info.cpp
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*
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* Created on: Dec 14, 2019
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* Author: devel
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*/
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#include <cpuid.h>
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#include <string>
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#include <unordered_set>
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#include "../cpu_info.hpp"
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namespace license {
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using namespace std;
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const unordered_set<string> virtual_cpu_names = {"bhyve bhyve ", "KVMKVMKVM", "Microsoft Hv",
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" lrpepyh vr", "prl hyperv ", "VMwareVMware",
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"XenVMMXenVMM", "ACRNACRNACRN", "VBoxVBoxVBox"};
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struct CPUVendorID {
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unsigned int ebx;
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unsigned int edx;
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unsigned int ecx;
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string toString() const { return string(reinterpret_cast<const char *>(this), 12); }
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};
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CpuInfo::CpuInfo() {}
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CpuInfo::~CpuInfo() {}
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/**
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* Detect Virtual machine using hypervisor bit.
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* @return true if the cpu hypervisor bit is set to 1
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*/
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bool CpuInfo::cpu_virtual() const {
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unsigned int level = 1, eax = 0, ebx = 0, ecx = 0, edx = 0;
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__get_cpuid(level, &eax, &ebx, &ecx, &edx);
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bool is_virtual = (((ecx >> 31) & 1) == 1); // hypervisor flag
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if (!is_virtual) {
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string cpu_vendor = vendor();
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auto it = virtual_cpu_names.find(cpu_vendor);
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is_virtual = (it != virtual_cpu_names.end());
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}
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return is_virtual;
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}
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uint32_t CpuInfo::model() {
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unsigned int level = 1, eax = 0, ebx = 0, ecx = 0, edx = 0;
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__get_cpuid(level, &eax, &ebx, &ecx, &edx);
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// ax bits 0-3 stepping,4-7 model,8-11 family id,12-13 processor type
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// 14-15 reserved, 16-19 extended model, 20-27 extended family, 27-31 reserved
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// bx bits 0-7 brand index
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return (eax & 0x3FFF) | (eax & 0x3FF8000) >> 2 | (ebx & 0xff) << 24;
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}
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string CpuInfo::vendor() const {
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unsigned int level = 0, eax = 0, ebx = 0, ecx = 0, edx = 0;
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// hypervisor flag false, try to get the vendor name, see if it's a virtual cpu
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__get_cpuid(level, &eax, &ebx, &ecx, &edx);
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CPUVendorID vendorID{.ebx = ebx, .edx = edx, .ecx = ecx};
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return vendorID.toString();
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}
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} /* namespace license */
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