C++ CPUID函数代码示例

/* #####   FUNCTION DEFINITIONS  -  LOCAL TO THIS SOURCE FILE   ########### */
static int get_cpu_perf_data(void)
{
    uint32_t eax = 0x0U, ebx = 0x0U, ecx = 0x0U, edx = 0x0U;
    int largest_function = 0;
    eax = 0x00;
    CPUID(eax, ebx, ecx, edx);
    largest_function = eax;
    if (cpuid_info.family == P6_FAMILY && 0x0A <= largest_function)
    {
        eax = 0x0A;
        CPUID(eax, ebx, ecx, edx);
        cpuid_info.perf_version   =  (eax&0xFFU);
        cpuid_info.perf_num_ctr   =   ((eax>>8)&0xFFU);
        cpuid_info.perf_width_ctr =  ((eax>>16)&0xFFU);
        cpuid_info.perf_num_fixed_ctr =  (edx&0xFU);

        eax = 0x06;
        CPUID(eax, ebx, ecx, edx);
        if (eax & (1<<1))
        {
            cpuid_info.turbo = 1;
        }
        else
        {
            cpuid_info.turbo = 0;
        }
    }

static void cpuid_cpu_get_brand(struct cpuid *cpuid)
{
	long int eax;
	long int ebx;
	long int ecx;
	long int edx;
	eax = 0x80000002;
	CPUID(eax, eax, ebx, ecx, edx);
	cpuid->cpu_brand[48] = 0;     /* init cpu_brand to null-terminate the string */
	char *ccb = cpuid->cpu_brand;
	*(int*)(ccb + 0 ) = (int)eax;
	*(int*)(ccb + 4 ) = ebx;
	*(int*)(ccb + 8 ) = ecx;
	*(int*)(ccb + 12) = edx;
	eax = 0x80000003;
	CPUID(eax, eax, ebx, ecx, edx);
	*(int*)(ccb + 16) = eax;
	*(int*)(ccb + 20) = ebx;
	*(int*)(ccb + 24) = ecx;
	*(int*)(ccb + 28) = edx;
	eax = 0x80000004;
	CPUID(eax, eax, ebx, ecx, edx);
	*(int*)(cpuid->cpu_brand + 32) = eax;
	*(int*)(cpuid->cpu_brand + 36) = ebx;
	*(int*)(cpuid->cpu_brand + 40) = ecx;
	*(int*)(cpuid->cpu_brand + 44) = edx;
}

VOID
NTAPI
INIT_FUNCTION
KiSetProcessorType(VOID)
{
    ULONG EFlags, NewEFlags;
    ULONG Reg, Dummy;
    ULONG Stepping, Type;

    /* Start by assuming no CPUID data */
    KeGetCurrentPrcb()->CpuID = 0;

    /* Save EFlags */
    EFlags = __readeflags();

    /* XOR out the ID bit and update EFlags */
    NewEFlags = EFlags ^ EFLAGS_ID;
    __writeeflags(NewEFlags);

    /* Get them back and see if they were modified */
    NewEFlags = __readeflags();
    if (NewEFlags != EFlags)
    {
        /* The modification worked, so CPUID exists. Set the ID Bit again. */
        EFlags |= EFLAGS_ID;
        __writeeflags(EFlags);

        /* Peform CPUID 0 to see if CPUID 1 is supported */
        CPUID(0, &Reg, &Dummy, &Dummy, &Dummy);
        if (Reg > 0)
        {
            /* Do CPUID 1 now */
            CPUID(1, &Reg, &Dummy, &Dummy, &Dummy);

            /*
             * Get the Stepping and Type. The stepping contains both the
             * Model and the Step, while the Type contains the returned Type.
             * We ignore the family.
             *
             * For the stepping, we convert this: zzzzzzxy into this: x0y
             */
            Stepping = Reg & 0xF0;
            Stepping <<= 4;
            Stepping += (Reg & 0xFF);
            Stepping &= 0xF0F;
            Type = Reg & 0xF00;
            Type >>= 8;

            /* Save them in the PRCB */
            KeGetCurrentPrcb()->CpuID = TRUE;
            KeGetCurrentPrcb()->CpuType = (UCHAR)Type;
            KeGetCurrentPrcb()->CpuStep = (USHORT)Stepping;
        }

void
cpu_init_mwait(struct cpu_softc *sc)
{
	unsigned int smallest, largest, extensions, c_substates;

	if ((cpu_ecxfeature & CPUIDECX_MWAIT) == 0 || cpuid_level < 0x5)
		return;

	/* get the monitor granularity */
	CPUID(0x5, smallest, largest, extensions, cpu_mwait_states);
	smallest &= 0xffff;
	largest  &= 0xffff;

	printf("%s: mwait min=%u, max=%u", sc->sc_dev.dv_xname,
	    smallest, largest);
	if (extensions & 0x1) {
		if (cpu_mwait_states > 0) {
			c_substates = cpu_mwait_states;
			printf(", C-substates=%u", 0xf & c_substates);
			while ((c_substates >>= 4) > 0)
				printf(".%u", 0xf & c_substates);
		}
		if (extensions & 0x2)
			printf(", IBE");
	} else {

void
pvbus_hyperv(struct pvbus_hv *hv)
{
	uint32_t regs[4];

	CPUID(hv->hv_base + CPUID_OFFSET_HYPERV_FEATURES,
	    regs[0], regs[1], regs[2], regs[3]);
	hv->hv_features = regs[0];

	CPUID(hv->hv_base + CPUID_OFFSET_HYPERV_VERSION,
	    regs[0], regs[1], regs[2], regs[3]);
	hv->hv_major = (regs[1] & HYPERV_VERSION_EBX_MAJOR_M) >>
	    HYPERV_VERSION_EBX_MAJOR_S;
	hv->hv_minor = (regs[1] & HYPERV_VERSION_EBX_MINOR_M) >>
	    HYPERV_VERSION_EBX_MINOR_S;
}

static int IsWIL( void )
{
	unsigned regs[4];

	// get CPU feature bits
	CPUID( 1, regs );

	// bit 26 of EDX denotes WIL existence
	if ( regs[3] & ( 1 << 26 ) )
	{
		// Ok, CPU supports this instruction, but does the OS?
		//
		// Test a WIL instruction and make sure you don't get an exception...
		//
		__try
		{
			__asm
			{
				pushad;
			// 	xorpd xmm0,xmm0;  // Willamette New Instructions 
					__emit 0x0f
					__emit 0x56
					__emit 0xc9
				popad;
			}
		}// If OS creates an exception, it doesn't support PentiumIV Instructions
		__except(EXCEPTION_EXECUTE_HANDLER)
		{
//			if(_exception_code()==STATUS_ILLEGAL_INSTRUCTION)	// forget it, any exception should count as fail for safety
				return qfalse; // Willamette New Instructions not supported
		}

		return qtrue;	// Williamette/P4 instructions available
	}

PetscErrorCode  PetscSSEHardwareTest(PetscBool  *flag)
{
  PetscErrorCode ierr;
  char *vendor;
  char Intel[13]="GenuineIntel";
  char AMD[13]  ="AuthenticAMD";

  PetscFunctionBegin;
  ierr = PetscMalloc(13*sizeof(char),&vendor);CHKERRQ(ierr);
  strcpy(vendor,"************");
  CPUID_GET_VENDOR(vendor);
  if (!strcmp(vendor,Intel) || !strcmp(vendor,AMD)) { 
    /* Both Intel and AMD use bit 25 of CPUID_FEATURES */
    /* to denote availability of SSE Support */
    unsigned long myeax,myebx,myecx,myedx;
    CPUID(CPUID_FEATURES,&myeax,&myebx,&myecx,&myedx);
    if (myedx & SSE_FEATURE_FLAG) {
      *flag = PETSC_TRUE;
    } else {
      *flag = PETSC_FALSE;
    }
  }
  ierr = PetscFree(vendor);CHKERRQ(ierr);
  PetscFunctionReturn(0);
}

/*
================
IsAMD
================
*/
static bool IsAMD( void ) {
	char pstring[16];
	char processorString[13];

	// get name of processor
	CPUID( 0, ( unsigned int * ) pstring );
	processorString[0] = pstring[4];
	processorString[1] = pstring[5];
	processorString[2] = pstring[6];
	processorString[3] = pstring[7];
	processorString[4] = pstring[12];
	processorString[5] = pstring[13];
	processorString[6] = pstring[14];
	processorString[7] = pstring[15];
	processorString[8] = pstring[8];
	processorString[9] = pstring[9];
	processorString[10] = pstring[10];
	processorString[11] = pstring[11];
	processorString[12] = 0;

	if ( strcmp( processorString, "AuthenticAMD" ) == 0 ) {
		return true;
	}
	return false;
}

static int IsP3() {
	unsigned regs[4];

	// get CPU feature bits
	CPUID( 1, regs );
	if ( regs[0] < 6 ) {
		return qfalse;
	}

	if ( !( regs[3] & 0x1 ) ) {
		return qfalse;    // fp
	}

	if ( !( regs[3] & 0x8000 ) ) { // cmov
		return qfalse;
	}

	if ( !( regs[3] & 0x800000 ) ) { // mmx
		return qfalse;
	}

	if ( !( regs[3] & 0x2000000 ) ) { // simd
		return qfalse;
	}

	return qtrue;
}

/*
================
Has3DNow
================
*/
static bool Has3DNow( void ) {
	unsigned regs[4];

	// check AMD-specific functions
	CPUID( 0x80000000, regs );
	if ( regs[_REG_EAX] < 0x80000000 ) {
		return false;
	}

	// bit 31 of EDX denotes 3DNow! support
	CPUID( 0x80000001, regs );
	if ( regs[_REG_EDX] & ( 1 << 31 ) ) {
		return true;
	}

	return false;
}

bool BurnCheckMMXSupport()
{
	unsigned int nSignatureEAX = 0, nSignatureEBX = 0, nSignatureECX = 0, nSignatureEDX = 0;

	CPUID(1, nSignatureEAX, nSignatureEBX, nSignatureECX, nSignatureEDX);

	return (nSignatureEDX >> 23) & 1;						// bit 23 of edx indicates MMX support
}

void
k8_powernow_init(struct cpu_info *ci)
{
	uint64_t status;
	u_int maxfid, maxvid, i;
	u_int32_t extcpuid, dummy;
	struct k8pnow_cpu_state *cstate;
	struct k8pnow_state *state;
	char * techname = NULL;

	if (setperf_prio > 1)
		return;

	cstate = malloc(sizeof(struct k8pnow_cpu_state), M_DEVBUF, M_NOWAIT);
	if (!cstate)
		return;

	cstate->n_states = 0;
	status = rdmsr(MSR_AMDK7_FIDVID_STATUS);
	maxfid = PN8_STA_MFID(status);
	maxvid = PN8_STA_MVID(status);

	/*
	* If start FID is different to max FID, then it is a
	* mobile processor.  If not, it is a low powered desktop
	* processor.
	*/
	if (PN8_STA_SFID(status) != PN8_STA_MFID(status))
		techname = "PowerNow! K8";
	else
		techname = "Cool'n'Quiet K8";

#if NACPICPU > 0
	/* If we have acpi check acpi first */
	if (!k8pnow_acpi_init(cstate, status))
#endif
	{
		if (!k8pnow_states(cstate, ci->ci_signature, maxfid, maxvid)) {
			/* Extended CPUID signature value */
			CPUID(0x80000001, extcpuid, dummy, dummy, dummy);
			k8pnow_states(cstate, extcpuid, maxfid, maxvid);
		}
	}
	if (cstate->n_states) {
		printf("%s: %s %d MHz: speeds:",
		    ci->ci_dev->dv_xname, techname, cpuspeed);
		for (i = cstate->n_states; i > 0; i--) {
			state = &cstate->state_table[i-1];
			printf(" %d", state->freq);
		}
		printf(" MHz\n");
		k8pnow_current_state = cstate;
		cpu_setperf = k8_powernow_setperf;
		setperf_prio = 1;
		return;
	}
	free(cstate, M_DEVBUF, sizeof(*cstate));
}

void		vmx_supported(void)
{
  uint32_t	eax, ebx, ecx, edx;
  uint32_t	value = 1;

  CPUID(value, &eax, &ebx, &ecx, &edx);

  printf("< CPUID >\n\teax: %x\n\tebx: %x\n\tecx: %x\n\tedx: %x\n",
	 eax, ebx, ecx, edx);

  printf("VMX-operations supported:\t");
  if ((ecx & (1 << 5)) == 1)
    {
      printf("[OK]\n");
    }
  else
    {
      printf("[NO]\n");
    }

  printf("SYSENTER and SYSEXIT supported:\t");
  if ((edx & (1 << 11)) == 1)
    {
      printf("[OK]\n");
    }
  else
    {
      printf("[NO]\n");
    }

  value = 1;
  CPUID(value, &eax, &ebx, &ecx, &edx);
  printf("PAE-ext supported:\t\t");
  if ((edx & (1 << 6)) == 1)
    {
      printf("[OK]\n");
    }
  else
    {
      printf("[NO]\n");
    }

  while (1)
    ;
}

void
pvbus_kvm(struct pvbus_hv *hv)
{
	uint32_t regs[4];

	CPUID(hv->hv_base + CPUID_OFFSET_KVM_FEATURES,
	    regs[0], regs[1], regs[2], regs[3]);
	hv->hv_features = regs[0];
}

static int Is3DNOW(void)
{
	unsigned regs[4];
	char pstring[16];
	char processorString[13];

	// get name of processor
	CPUID(0, (unsigned int *) pstring);
	processorString[0] = pstring[4];
	processorString[1] = pstring[5];
	processorString[2] = pstring[6];
	processorString[3] = pstring[7];
	processorString[4] = pstring[12];
	processorString[5] = pstring[13];
	processorString[6] = pstring[14];
	processorString[7] = pstring[15];
	processorString[8] = pstring[8];
	processorString[9] = pstring[9];
	processorString[10] = pstring[10];
	processorString[11] = pstring[11];
	processorString[12] = 0;

//  REMOVED because you can have 3DNow! on non-AMD systems
//	if ( strcmp( processorString, "AuthenticAMD" ) )
//		return qfalse;

	// check AMD-specific functions
	CPUID(0x80000000, regs);

	if(regs[0] < 0x80000000)
	{
		return qfalse;
	}

	// bit 31 of EDX denotes 3DNOW! support
	CPUID(0x80000001, regs);

	if(regs[3] & (1 << 31))
	{
		return qtrue;
	}

	return qfalse;
}