C++ A Collection of Low Level Functions for the CPU

sysinfo.cpp

#include "SysInfo.h"
#include <intrin.h>

BOOL __stdcall DllMain(HINSTANCE hInst, DWORD dwReason, LPVOID lpReserved)
{
	return TRUE;
}

extern "C" __declspec(dllexport) bool __stdcall tsc_supported()
{
	int CPUInfo[4] = { -1 };
	__cpuid(CPUInfo, 0x80000001);
	if (CPUInfo[3] & 0x4000000)
		return true;
	return false;
}

extern "C" __declspec(dllexport) unsigned int __stdcall getCPUSpeed()
{
	LARGE_INTEGER ulFreq, ulTicks, ulValue, ulStartCounter, ulEAX_EDX, ulResult;
	QueryPerformanceFrequency(&ulFreq);
	QueryPerformanceCounter(&ulTicks);
	ulValue.QuadPart = ulTicks.QuadPart + ulFreq.QuadPart;

	_asm {
		rdtsc
		mov ulEAX_EDX.LowPart, EAX
		mov ulEAX_EDX.HighPart, EDX
	}

	ulStartCounter.QuadPart = ulEAX_EDX.QuadPart;

	do
	{
		QueryPerformanceCounter(&ulTicks);
	} while (ulTicks.QuadPart <= ulValue.QuadPart);

	_asm {
		rdtsc
		mov ulEAX_EDX.LowPart, EAX
		mov ulEAX_EDX.HighPart, EDX
	}

	ulResult.QuadPart = ulEAX_EDX.QuadPart - ulStartCounter.QuadPart;

	return (unsigned int)ulResult.QuadPart / 1000000;
}


extern "C" __declspec(dllexport) unsigned __int64 __stdcall rdtsc()
{
	return __rdtsc();
}


extern "C" __declspec(dllexport) char* __stdcall getCPUType()
{
	static char pszCPUType[13];
	memset(pszCPUType, 0, 13);

	_asm {
		mov eax, 0
		cpuid

		mov pszCPUType[0], bl
		mov pszCPUType[1], bh

		ror ebx, 16
		mov pszCPUType[2], bl
		mov pszCPUType[3], bh

		mov pszCPUType[4], dl
		mov pszCPUType[5], dh

		ror edx, 16
		mov pszCPUType[6], dl
		mov pszCPUType[7], dh

		mov pszCPUType[8], cl
		mov pszCPUType[9], ch

		ror ecx, 16
		mov pszCPUType[10], cl
		mov pszCPUType[11], ch
	}

	pszCPUType[12] = '\0';

	return pszCPUType;
}

extern "C" __declspec(dllexport) int __stdcall getCPUFamily()
{
	int retVal;

	_asm {
		mov eax, 1
		cpuid
		mov retVal, eax
	}

	return (retVal >> 8);
}

extern "C" __declspec(dllexport) int __stdcall getCPUModel()
{
	int retVal;

	_asm {
		mov eax, 1
		cpuid
		mov retVal, eax
	}

	return ((retVal >> 4) & 0x0000000f);
}

extern "C" __declspec(dllexport) int __stdcall getCPUStepping()
{
	int retVal;

	_asm {
		mov eax, 1
		cpuid
		mov retVal, eax
	}

	return (retVal & 0x0000000f);
}

extern "C" __declspec(dllexport) unsigned int __stdcall getCPUSpeed1()
{
	unsigned long TimerLo, TimerHi;

	Sleep(10);
	_asm {
		rdtsc
		mov TimerLo, eax
		mov TimerHi, edx
	}

	Sleep(500);

	_asm {
		rdtsc
		sub eax, TimerLo
		sbb edx, TimerHi
		mov TimerLo, eax
		mov TimerHi, edx
	}
	return (unsigned int)(TimerLo / (1000 * 500));
}