83 lines
2.1 KiB
C++
83 lines
2.1 KiB
C++
#include "cpu/CPU.h"
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#include <cpuid.h>
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#include <string.h>
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const char* CPU::get_vendor_string()
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{
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static bool cached = false;
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static char vendor[13];
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if (cached) { return vendor; }
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else
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{
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unsigned int unused, ebx, ecx, edx;
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__get_cpuid(0, &unused, &ebx, &ecx, &edx);
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memcpy(vendor, &ebx, 4);
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memcpy(&vendor[4], &edx, 4);
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memcpy(&vendor[8], &ecx, 4);
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vendor[12] = 0;
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cached = true;
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return vendor;
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}
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}
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const char* CPU::get_brand_string()
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{
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static bool cached = false;
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static char brand[49];
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if (cached) { return brand; }
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else
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{
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unsigned int eax, ebx, ecx, edx;
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__get_cpuid(0x80000002, &eax, &ebx, &ecx, &edx);
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memcpy(brand, &eax, 4);
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memcpy(&brand[4], &ebx, 4);
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memcpy(&brand[8], &ecx, 4);
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memcpy(&brand[12], &edx, 4);
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__get_cpuid(0x80000003, &eax, &ebx, &ecx, &edx);
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memcpy(&brand[16], &eax, 4);
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memcpy(&brand[16 + 4], &ebx, 4);
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memcpy(&brand[16 + 8], &ecx, 4);
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memcpy(&brand[16 + 12], &edx, 4);
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__get_cpuid(0x80000004, &eax, &ebx, &ecx, &edx);
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memcpy(&brand[32], &eax, 4);
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memcpy(&brand[32 + 4], &ebx, 4);
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memcpy(&brand[32 + 8], &ecx, 4);
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memcpy(&brand[32 + 12], &edx, 4);
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brand[48] = 0;
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cached = true;
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return brand;
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}
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}
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uint64_t CPU::get_feature_bitmask()
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{
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static uint64_t bitmask = 0;
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static bool cached = false;
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if (cached) return bitmask;
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unsigned int unused;
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unsigned int ecx = 0;
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unsigned int edx = 0;
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__get_cpuid(1, &unused, &unused, &ecx, &edx);
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bitmask = ((uint64_t)ecx << 32) | (uint64_t)edx;
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cached = true;
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return bitmask;
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}
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static bool _has_feature(int feature)
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{
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return (CPU::get_feature_bitmask() & (uint64_t)(1 << feature)) > 0;
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}
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bool CPU::has_feature(CPU::Features feature)
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{
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return _has_feature((int)feature);
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}
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uint64_t CPU::get_initial_apic_id()
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{
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unsigned int unused;
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unsigned int ebx = 0;
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__get_cpuid(1, &unused, &ebx, &unused, &unused);
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return ebx >> 24;
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}
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