cpu.c File Reference

#include <ntoskrnl.h>
#include <x86x64/Cpuid.h>
#include <x86x64/Msr.h>
#include <debug.h>

Include dependency graph for cpu.c:

Go to the source code of this file.

Classes
union	_CPU_SIGNATURE

Macros
#define	NDEBUG

Typedefs
typedef union _CPU_SIGNATURE	CPU_SIGNATURE

Functions
ULONG NTAPI	KiGetCpuVendor (VOID)
VOID NTAPI	KiSetProcessorType (VOID)
ULONG64 NTAPI	KiGetFeatureBits (VOID)
	Evaluates the KeFeatureFlag bits for the current CPU.
VOID NTAPI	KiGetCacheInformation (VOID)
VOID NTAPI	KeFlushCurrentTb (VOID)
VOID NTAPI	KiRestoreProcessorControlState (PKPROCESSOR_STATE ProcessorState)
VOID NTAPI	KiSaveProcessorControlState (OUT PKPROCESSOR_STATE ProcessorState)
VOID NTAPI	KeFlushEntireTb (IN BOOLEAN Invalid, IN BOOLEAN AllProcessors)
KAFFINITY NTAPI	KeQueryActiveProcessors (VOID)
NTSTATUS NTAPI	KxSaveFloatingPointState (OUT PKFLOATING_SAVE FloatingState)
NTSTATUS NTAPI	KxRestoreFloatingPointState (IN PKFLOATING_SAVE FloatingState)
BOOLEAN NTAPI	KeInvalidateAllCaches (VOID)
ULONG NTAPI	KeGetRecommendedSharedDataAlignment (VOID)
VOID __cdecl	KeSaveStateForHibernate (IN PKPROCESSOR_STATE State)
VOID NTAPI	KeSetDmaIoCoherency (IN ULONG Coherency)

Variables
KTSS64	KiBootTss
ULONG	KeI386CpuType
ULONG	KeI386CpuStep
ULONG	KeI386MachineType
ULONG	KeI386NpxPresent = 1
ULONG	KeLargestCacheLine = 0x40
ULONG	KiDmaIoCoherency = 0
BOOLEAN	KiSMTProcessorsPresent
volatile LONG	KiTbFlushTimeStamp
static const CHAR	CmpIntelID [] = "GenuineIntel"
static const CHAR	CmpAmdID [] = "AuthenticAMD"
static const CHAR	CmpCentaurID [] = "CentaurHauls"

Macro Definition Documentation

NDEBUG

#define NDEBUG

Definition at line 15 of file cpu.c.

Typedef Documentation

CPU_SIGNATURE

typedef union _CPU_SIGNATURE CPU_SIGNATURE

Function Documentation

KeFlushCurrentTb()

VOID NTAPI KeFlushCurrentTb

(

VOID

)

Definition at line 526 of file cpu.c.

{
    /* Flush the TLB by resetting CR3 */
    __writecr3(__readcr3());
}

Referenced by KeFlushEntireTb(), and KiFlushTargetEntireTb().

KeFlushEntireTb()

VOID NTAPI KeFlushEntireTb	(	IN BOOLEAN	Invalid,
		IN BOOLEAN	AllProcessors
	)

Definition at line 617 of file cpu.c.

{
    KIRQL OldIrql;
 
    // FIXME: halfplemented
    /* Raise the IRQL for the TB Flush */
    OldIrql = KeRaiseIrqlToSynchLevel();
 
    /* Flush the TB for the Current CPU, and update the flush stamp */
    KeFlushCurrentTb();
 
    /* Update the flush stamp and return to original IRQL */
    InterlockedExchangeAdd(&KiTbFlushTimeStamp, 1);
    KeLowerIrql(OldIrql);
 
}

Referenced by MiAllocatePoolPages(), MiDeleteSystemPageableVm(), MiDereferenceSession(), MiMapLockedPagesInUserSpace(), MiProtectFreeNonPagedPool(), MiSetSystemCodeProtection(), MmFreeSpecialPool(), MmMapIoSpace(), and MmUnmapIoSpace().

KeGetRecommendedSharedDataAlignment()

ULONG NTAPI KeGetRecommendedSharedDataAlignment

(

VOID

)

Definition at line 675 of file cpu.c.

{
    /* Return the global variable */
    return KeLargestCacheLine;
}

Referenced by ClassGetLBProvisioningResources(), ClasspDeviceGetBlockDeviceCharacteristicsVPDPage(), ClasspDeviceGetBlockLimitsVPDPage(), ClasspDeviceGetLBAStatusWorker(), ClasspDeviceGetLBProvisioningVPDPage(), ClasspGetBlockDeviceTokenLimitsInfo(), ClasspGetInquiryVpdSupportInfo(), ClassReadCapacity16(), ClassSendSrbSynchronous(), DeviceProcessDsmTrimRequest(), ExAllocateCacheAwareRundownProtection(), ExInitializeRundownProtectionCacheAware(), ExSizeOfRundownProtectionCacheAware(), and NdisGetSharedDataAlignment().

KeInvalidateAllCaches()

BOOLEAN NTAPI KeInvalidateAllCaches

(

VOID

)

Definition at line 663 of file cpu.c.

{
    /* Invalidate all caches */
    __wbinvd();
    return TRUE;
}

KeQueryActiveProcessors()

KAFFINITY NTAPI KeQueryActiveProcessors

(

VOID

)

Definition at line 637 of file cpu.c.

{
    PAGED_CODE();
 
    /* Simply return the number of active processors */
    return KeActiveProcessors;
}

Referenced by get_num_of_processors(), HalRequestIpiSpecifyVector(), and KeQueryActiveProcessorCount().

KeSaveStateForHibernate()

VOID __cdecl KeSaveStateForHibernate

(

IN PKPROCESSOR_STATE

State

)

Definition at line 686 of file cpu.c.

{
    /* Capture the context */
    RtlCaptureContext(&State->ContextFrame);
 
    /* Capture the control state */
    KiSaveProcessorControlState(State);
}

KeSetDmaIoCoherency()

VOID NTAPI KeSetDmaIoCoherency

(

IN ULONG

Coherency

)

Definition at line 700 of file cpu.c.

{
    /* Save the coherency globally */
    KiDmaIoCoherency = Coherency;
}

KiGetCacheInformation()

VOID NTAPI KiGetCacheInformation

(

VOID

)

Definition at line 418 of file cpu.c.

{
    PKIPCR Pcr = (PKIPCR)KeGetPcr();
    ULONG Vendor;
    ULONG CacheRequests = 0, i;
    ULONG CurrentRegister;
    UCHAR RegisterByte;
    BOOLEAN FirstPass = TRUE;
    CPU_INFO CpuInfo;
 
    /* Set default L2 size */
    Pcr->SecondLevelCacheSize = 0;
 
    /* Get the Vendor ID and make sure we support CPUID */
    Vendor = KiGetCpuVendor();
    if (!Vendor) return;
 
    /* Check the Vendor ID */
    switch (Vendor)
    {
        /* Handle Intel case */
        case CPU_INTEL:
 
            /*Check if we support CPUID 2 */
            KiCpuId(&CpuInfo, 0);
            if (CpuInfo.Eax >= 2)
            {
                /* We need to loop for the number of times CPUID will tell us to */
                do
                {
                    /* Do the CPUID call */
                    KiCpuId(&CpuInfo, 2);
 
                    /* Check if it was the first call */
                    if (FirstPass)
                    {
                        /*
                         * The number of times to loop is the first byte. Read
                         * it and then destroy it so we don't get confused.
                         */
                        CacheRequests = CpuInfo.Eax & 0xFF;
                        CpuInfo.Eax &= 0xFFFFFF00;
 
                        /* Don't go over this again */
                        FirstPass = FALSE;
                    }
 
                    /* Loop all 4 registers */
                    for (i = 0; i < 4; i++)
                    {
                        /* Get the current register */
                        CurrentRegister = CpuInfo.AsUINT32[i];
 
                        /*
                         * If the upper bit is set, then this register should
                         * be skipped.
                         */
                        if (CurrentRegister & 0x80000000) continue;
 
                        /* Keep looping for every byte inside this register */
                        while (CurrentRegister)
                        {
                            /* Read a byte, skip a byte. */
                            RegisterByte = (UCHAR)(CurrentRegister & 0xFF);
                            CurrentRegister >>= 8;
                            if (!RegisterByte) continue;
 
                            /*
                             * Valid values are from 0x40 (0 bytes) to 0x49
                             * (32MB), or from 0x80 to 0x89 (same size but
                             * 8-way associative.
                             */
                            if (((RegisterByte > 0x40) &&
                                 (RegisterByte <= 0x49)) ||
                                ((RegisterByte > 0x80) &&
                                (RegisterByte <= 0x89)))
                            {
                                /* Mask out only the first nibble */
                                RegisterByte &= 0x0F;
 
                                /* Set the L2 Cache Size */
                                Pcr->SecondLevelCacheSize = 0x10000 <<
                                                            RegisterByte;
                            }
                        }
                    }
                } while (--CacheRequests);
            }
            break;
 
        case CPU_AMD:
 
            /* Check if we support CPUID 0x80000006 */
            KiCpuId(&CpuInfo, 0x80000000);
            if (CpuInfo.Eax >= 6)
            {
                /* Get 2nd level cache and tlb size */
                KiCpuId(&CpuInfo, 0x80000006);
 
                /* Set the L2 Cache Size */
                Pcr->SecondLevelCacheSize = (CpuInfo.Ecx & 0xFFFF0000) >> 6;
            }
            break;
    }
}

KiGetCpuVendor()

ULONG NTAPI KiGetCpuVendor

(

VOID

)

Definition at line 59 of file cpu.c.

{
    PKPRCB Prcb = KeGetCurrentPrcb();
    CPU_INFO CpuInfo;
 
    /* Get the Vendor ID and null-terminate it */
    KiCpuId(&CpuInfo, 0);
 
    /* Copy it to the PRCB and null-terminate it */
    *(ULONG*)&Prcb->VendorString[0] = CpuInfo.Ebx;
    *(ULONG*)&Prcb->VendorString[4] = CpuInfo.Edx;
    *(ULONG*)&Prcb->VendorString[8] = CpuInfo.Ecx;
    Prcb->VendorString[12] = 0;
 
    /* Now check the CPU Type */
    if (!strcmp((PCHAR)Prcb->VendorString, CmpIntelID))
    {
        Prcb->CpuVendor = CPU_INTEL;
    }
    else if (!strcmp((PCHAR)Prcb->VendorString, CmpAmdID))
    {
        Prcb->CpuVendor = CPU_AMD;
    }
    else if (!strcmp((PCHAR)Prcb->VendorString, CmpCentaurID))
    {
        DPRINT1("VIA CPUs not fully supported\n");
        Prcb->CpuVendor = CPU_VIA;
    }
    else
    {
        /* Invalid CPU */
        DPRINT1("%s CPU support not fully tested!\n", Prcb->VendorString);
        Prcb->CpuVendor = CPU_UNKNOWN;
    }
 
    return Prcb->CpuVendor;
}

Referenced by KiGetCacheInformation(), KiGetFeatureBits(), and KiSetProcessorType().

KiGetFeatureBits()

ULONG64 NTAPI KiGetFeatureBits

(

VOID

)

Evaluates the KeFeatureFlag bits for the current CPU.

Returns

The feature flags for this CPU.

See also

https://www.geoffchappell.com/studies/windows/km/ntoskrnl/structs/kprcb/featurebits.htm

Todo:

• KF_VIRT_FIRMWARE_ENABLED 0x08000000 (see notes from Geoff Chappell)
• KF_FPU_LEAKAGE 0x0000020000000000ULL
• KF_CAT 0x0000100000000000ULL
• KF_CET_SS 0x0000400000000000ULL

Definition at line 165 of file cpu.c.

{
    PKPRCB Prcb = KeGetCurrentPrcb();
    ULONG Vendor;
    ULONG64 FeatureBits = 0;
    CPUID_SIGNATURE_REGS signature;
    CPUID_VERSION_INFO_REGS VersionInfo;
    CPUID_EXTENDED_FUNCTION_REGS extendedFunction;
 
    /* Get the Vendor ID */
    Vendor = Prcb->CpuVendor;
 
    /* Make sure we got a valid vendor ID at least. */
    if (Vendor == CPU_UNKNOWN) return FeatureBits;
 
    /* Get signature CPUID for the maximum function */
    __cpuid(signature.AsInt32, CPUID_SIGNATURE);
 
    /* Get the CPUID Info. */
    __cpuid(VersionInfo.AsInt32, CPUID_VERSION_INFO);
 
    /* Set the initial APIC ID */
    Prcb->InitialApicId = (UCHAR)VersionInfo.Ebx.Bits.InitialLocalApicId;
 
    /* Convert all CPUID Feature bits into our format */
    if (VersionInfo.Edx.Bits.VME) FeatureBits |= KF_CR4;
    if (VersionInfo.Edx.Bits.PSE) FeatureBits |= KF_LARGE_PAGE | KF_CR4;
    if (VersionInfo.Edx.Bits.TSC) FeatureBits |= KF_RDTSC;
    if (VersionInfo.Edx.Bits.CX8) FeatureBits |= KF_CMPXCHG8B;
    if (VersionInfo.Edx.Bits.SEP) FeatureBits |= KF_FAST_SYSCALL;
    if (VersionInfo.Edx.Bits.MTRR) FeatureBits |= KF_MTRR;
    if (VersionInfo.Edx.Bits.PGE) FeatureBits |= KF_GLOBAL_PAGE | KF_CR4;
    if (VersionInfo.Edx.Bits.CMOV) FeatureBits |= KF_CMOV;
    if (VersionInfo.Edx.Bits.PAT) FeatureBits |= KF_PAT;
    if (VersionInfo.Edx.Bits.DS) FeatureBits |= KF_DTS;
    if (VersionInfo.Edx.Bits.MMX) FeatureBits |= KF_MMX;
    if (VersionInfo.Edx.Bits.FXSR) FeatureBits |= KF_FXSR;
    if (VersionInfo.Edx.Bits.SSE) FeatureBits |= KF_XMMI;
    if (VersionInfo.Edx.Bits.SSE2) FeatureBits |= KF_XMMI64;
 
    if (VersionInfo.Ecx.Bits.SSE3) FeatureBits |= KF_SSE3;
    if (VersionInfo.Ecx.Bits.SSSE3) FeatureBits |= KF_SSSE3;
    if (VersionInfo.Ecx.Bits.CMPXCHG16B) FeatureBits |= KF_CMPXCHG16B;
    if (VersionInfo.Ecx.Bits.SSE4_1) FeatureBits |= KF_SSE4_1;
    if (VersionInfo.Ecx.Bits.XSAVE) FeatureBits |= KF_XSTATE;
    if (VersionInfo.Ecx.Bits.RDRAND) FeatureBits |= KF_RDRAND;
 
    /* Check if the CPU has hyper-threading */
    if (VersionInfo.Edx.Bits.HTT)
    {
        /* Set the number of logical CPUs */
        Prcb->LogicalProcessorsPerPhysicalProcessor =
            VersionInfo.Ebx.Bits.MaximumAddressableIdsForLogicalProcessors;
        if (Prcb->LogicalProcessorsPerPhysicalProcessor > 1)
        {
            /* We're on dual-core */
            KiSMTProcessorsPresent = TRUE;
        }
    }
    else
    {
        /* We only have a single CPU */
        Prcb->LogicalProcessorsPerPhysicalProcessor = 1;
    }
 
    /* Check if CPUID_THERMAL_POWER_MANAGEMENT (0x06) is supported */
    if (signature.MaxLeaf >= CPUID_THERMAL_POWER_MANAGEMENT)
    {
        /* Read CPUID_THERMAL_POWER_MANAGEMENT */
        CPUID_THERMAL_POWER_MANAGEMENT_REGS PowerInfo;
        __cpuid(PowerInfo.AsInt32, CPUID_THERMAL_POWER_MANAGEMENT);
 
        if (PowerInfo.Undoc.Ecx.ACNT2) FeatureBits |= KF_ACNT2;
    }
 
    /* Check if CPUID_STRUCTURED_EXTENDED_FEATURE_FLAGS (0x07) is supported */
    if (signature.MaxLeaf >= CPUID_STRUCTURED_EXTENDED_FEATURE_FLAGS)
    {
        /* Read CPUID_STRUCTURED_EXTENDED_FEATURE_FLAGS */
        CPUID_STRUCTURED_EXTENDED_FEATURE_FLAGS_REGS ExtFlags;
        __cpuidex(ExtFlags.AsInt32,
            CPUID_STRUCTURED_EXTENDED_FEATURE_FLAGS,
            CPUID_STRUCTURED_EXTENDED_FEATURE_FLAGS_SUB_LEAF_INFO);
 
        if (ExtFlags.Ebx.Bits.SMEP) FeatureBits |= KF_SMEP;
        if (ExtFlags.Ebx.Bits.FSGSBASE) FeatureBits |= KF_RDWRFSGSBASE;
        if (ExtFlags.Ebx.Bits.SMAP) FeatureBits |= KF_SMAP;
    }
 
    /* Check if CPUID_EXTENDED_STATE (0x0D) is supported */
    if (signature.MaxLeaf >= CPUID_EXTENDED_STATE)
    {
        /* Read CPUID_EXTENDED_STATE */
        CPUID_EXTENDED_STATE_SUB_LEAF_EAX_REGS ExtStateSub;
        __cpuidex(ExtStateSub.AsInt32,
            CPUID_EXTENDED_STATE,
            CPUID_EXTENDED_STATE_SUB_LEAF);
 
        if (ExtStateSub.Eax.Bits.XSAVEOPT) FeatureBits |= KF_XSAVEOPT;
        if (ExtStateSub.Eax.Bits.XSAVES)  FeatureBits |= KF_XSAVES;
    }
 
    /* Check extended cpuid features */
    __cpuid(extendedFunction.AsInt32, CPUID_EXTENDED_FUNCTION);
    if ((extendedFunction.MaxLeaf & 0xffffff00) == 0x80000000)
    {
        /* Check if CPUID_EXTENDED_CPU_SIG (0x80000001) is supported */
        if (extendedFunction.MaxLeaf >= CPUID_EXTENDED_CPU_SIG)
        {
            /* Read CPUID_EXTENDED_CPU_SIG */
            CPUID_EXTENDED_CPU_SIG_REGS ExtSig;
            __cpuid(ExtSig.AsInt32, CPUID_EXTENDED_CPU_SIG);
 
            /* Check if NX-bit is supported */
            if (ExtSig.Intel.Edx.Bits.NX) FeatureBits |= KF_NX_BIT;
            if (ExtSig.Intel.Edx.Bits.Page1GB) FeatureBits |= KF_HUGEPAGE;
            if (ExtSig.Intel.Edx.Bits.RDTSCP) FeatureBits |= KF_RDTSCP;
 
            /* AMD specific */
            if (Vendor == CPU_AMD)
            {
                if (ExtSig.Amd.Edx.Bits.ThreeDNow) FeatureBits |= KF_3DNOW;
            }
        }
    }
 
    /* Vendor specific */
    if (Vendor == CPU_INTEL)
    {
        FeatureBits |= KF_GENUINE_INTEL;
 
        /* Check for models that support LBR */
        if (VersionInfo.Eax.Bits.FamilyId == 6)
        {
            if ((VersionInfo.Eax.Bits.Model == 15) ||
                (VersionInfo.Eax.Bits.Model == 22) ||
                (VersionInfo.Eax.Bits.Model == 23) ||
                (VersionInfo.Eax.Bits.Model == 26))
            {
                FeatureBits |= KF_BRANCH;
            }
        }
 
        /* Check if VMX is available */
        if (VersionInfo.Ecx.Bits.VMX)
        {
            /* Read PROCBASED ctls and check if secondary are allowed */
            MSR_IA32_VMX_PROCBASED_CTLS_REGISTER ProcBasedCtls;
            ProcBasedCtls.Uint64 = __readmsr(MSR_IA32_VMX_PROCBASED_CTLS);
            if (ProcBasedCtls.Bits.Allowed1.ActivateSecondaryControls)
            {
                /* Read secondary controls and check if EPT is allowed */
                MSR_IA32_VMX_PROCBASED_CTLS2_REGISTER ProcBasedCtls2;
                ProcBasedCtls2.Uint64 = __readmsr(MSR_IA32_VMX_PROCBASED_CTLS2);
                if (ProcBasedCtls2.Bits.Allowed1.EPT)
                    FeatureBits |= KF_SLAT;
            }
        }
    }
    else if (Vendor == CPU_AMD)
    {
        FeatureBits |= KF_AUTHENTICAMD;
        FeatureBits |= KF_BRANCH;
 
        /* Check extended cpuid features */
        if ((extendedFunction.MaxLeaf & 0xffffff00) == 0x80000000)
        {
            /* Check if CPUID_AMD_SVM_FEATURES (0x8000000A) is supported */
            if (extendedFunction.MaxLeaf >= CPUID_AMD_SVM_FEATURES)
            {
                /* Read CPUID_AMD_SVM_FEATURES and check if Nested Paging is available */
                CPUID_AMD_SVM_FEATURES_REGS SvmFeatures;
                __cpuid(SvmFeatures.AsInt32, CPUID_AMD_SVM_FEATURES);
                if (SvmFeatures.Edx.Bits.NP) FeatureBits |= KF_SLAT;
            }
        }
    }
 
    /* Return the Feature Bits */
    return FeatureBits;
}

KiRestoreProcessorControlState()

VOID NTAPI KiRestoreProcessorControlState

(

PKPROCESSOR_STATE

ProcessorState

)

Definition at line 534 of file cpu.c.

{
    /* Restore the CR registers */
    __writecr0(ProcessorState->SpecialRegisters.Cr0);
//    __writecr2(ProcessorState->SpecialRegisters.Cr2);
    __writecr3(ProcessorState->SpecialRegisters.Cr3);
    __writecr4(ProcessorState->SpecialRegisters.Cr4);
    __writecr8(ProcessorState->SpecialRegisters.Cr8);
 
    /* Restore the DR registers */
    __writedr(0, ProcessorState->SpecialRegisters.KernelDr0);
    __writedr(1, ProcessorState->SpecialRegisters.KernelDr1);
    __writedr(2, ProcessorState->SpecialRegisters.KernelDr2);
    __writedr(3, ProcessorState->SpecialRegisters.KernelDr3);
    __writedr(6, ProcessorState->SpecialRegisters.KernelDr6);
    __writedr(7, ProcessorState->SpecialRegisters.KernelDr7);
 
    /* Restore GDT, IDT, LDT and TSS */
    __lgdt(&ProcessorState->SpecialRegisters.Gdtr.Limit);
//    __lldt(&ProcessorState->SpecialRegisters.Ldtr);
//    __ltr(&ProcessorState->SpecialRegisters.Tr);
    __lidt(&ProcessorState->SpecialRegisters.Idtr.Limit);
 
    _mm_setcsr(ProcessorState->SpecialRegisters.MxCsr);
//    ProcessorState->SpecialRegisters.DebugControl
//    ProcessorState->SpecialRegisters.LastBranchToRip
//    ProcessorState->SpecialRegisters.LastBranchFromRip
//    ProcessorState->SpecialRegisters.LastExceptionToRip
//    ProcessorState->SpecialRegisters.LastExceptionFromRip
 
    /* Restore MSRs */
    __writemsr(X86_MSR_GSBASE, ProcessorState->SpecialRegisters.MsrGsBase);
    __writemsr(X86_MSR_KERNEL_GSBASE, ProcessorState->SpecialRegisters.MsrGsSwap);
    __writemsr(X86_MSR_STAR, ProcessorState->SpecialRegisters.MsrStar);
    __writemsr(X86_MSR_LSTAR, ProcessorState->SpecialRegisters.MsrLStar);
    __writemsr(X86_MSR_CSTAR, ProcessorState->SpecialRegisters.MsrCStar);
    __writemsr(X86_MSR_SFMASK, ProcessorState->SpecialRegisters.MsrSyscallMask);
 
}

KiSaveProcessorControlState()

VOID NTAPI KiSaveProcessorControlState

(

OUT PKPROCESSOR_STATE

ProcessorState

)

Definition at line 576 of file cpu.c.

{
    /* Save the CR registers */
    ProcessorState->SpecialRegisters.Cr0 = __readcr0();
    ProcessorState->SpecialRegisters.Cr2 = __readcr2();
    ProcessorState->SpecialRegisters.Cr3 = __readcr3();
    ProcessorState->SpecialRegisters.Cr4 = __readcr4();
    ProcessorState->SpecialRegisters.Cr8 = __readcr8();
 
    /* Save the DR registers */
    ProcessorState->SpecialRegisters.KernelDr0 = __readdr(0);
    ProcessorState->SpecialRegisters.KernelDr1 = __readdr(1);
    ProcessorState->SpecialRegisters.KernelDr2 = __readdr(2);
    ProcessorState->SpecialRegisters.KernelDr3 = __readdr(3);
    ProcessorState->SpecialRegisters.KernelDr6 = __readdr(6);
    ProcessorState->SpecialRegisters.KernelDr7 = __readdr(7);
 
    /* Save GDT, IDT, LDT and TSS */
    __sgdt(&ProcessorState->SpecialRegisters.Gdtr.Limit);
    __sldt(&ProcessorState->SpecialRegisters.Ldtr);
    __str(&ProcessorState->SpecialRegisters.Tr);
    __sidt(&ProcessorState->SpecialRegisters.Idtr.Limit);
 
    ProcessorState->SpecialRegisters.MxCsr = _mm_getcsr();
//    ProcessorState->SpecialRegisters.DebugControl =
//    ProcessorState->SpecialRegisters.LastBranchToRip =
//    ProcessorState->SpecialRegisters.LastBranchFromRip =
//    ProcessorState->SpecialRegisters.LastExceptionToRip =
//    ProcessorState->SpecialRegisters.LastExceptionFromRip =
 
    /* Save MSRs */
    ProcessorState->SpecialRegisters.MsrGsBase = __readmsr(X86_MSR_GSBASE);
    ProcessorState->SpecialRegisters.MsrGsSwap = __readmsr(X86_MSR_KERNEL_GSBASE);
    ProcessorState->SpecialRegisters.MsrStar = __readmsr(X86_MSR_STAR);
    ProcessorState->SpecialRegisters.MsrLStar = __readmsr(X86_MSR_LSTAR);
    ProcessorState->SpecialRegisters.MsrCStar = __readmsr(X86_MSR_CSTAR);
    ProcessorState->SpecialRegisters.MsrSyscallMask = __readmsr(X86_MSR_SFMASK);
}

Referenced by KeSaveStateForHibernate(), and KiSaveProcessorState().

KiSetProcessorType()

VOID NTAPI KiSetProcessorType

(

VOID

)

Definition at line 99 of file cpu.c.

{
    CPU_INFO CpuInfo;
    CPU_SIGNATURE CpuSignature;
    BOOLEAN ExtendModel;
    ULONG Stepping, Type, Vendor;
 
    /* This initializes Prcb->CpuVendor */
    Vendor = KiGetCpuVendor();
 
    /* Do CPUID 1 now */
    KiCpuId(&CpuInfo, 1);
 
    /*
     * Get the Stepping and Type. The stepping contains both the
     * Model and the Step, while the Type contains the returned Family.
     *
     * For the stepping, we convert this: zzzzzzxy into this: x0y
     */
    CpuSignature.AsULONG = CpuInfo.Eax;
    Stepping = CpuSignature.Model;
    ExtendModel = (CpuSignature.Family == 15);
#if ( (NTDDI_VERSION >= NTDDI_WINXPSP2) && (NTDDI_VERSION < NTDDI_WS03) ) || (NTDDI_VERSION >= NTDDI_WS03SP1)
    if (CpuSignature.Family == 6)
    {
        ExtendModel |= (Vendor == CPU_INTEL);
#if (NTDDI_VERSION >= NTDDI_WIN8)
        ExtendModel |= (Vendor == CPU_CENTAUR);
#endif
    }
#endif
    if (ExtendModel)
    {
        /* Add ExtendedModel to distinguish from non-extended values. */
        Stepping |= (CpuSignature.ExtendedModel << 4);
    }
    Stepping = (Stepping << 8) | CpuSignature.Step;
    Type = CpuSignature.Family;
    if (CpuSignature.Family == 15)
    {
        /* Add ExtendedFamily to distinguish from non-extended values.
         * It must not be larger than 0xF0 to avoid overflow. */
        Type += min(CpuSignature.ExtendedFamily, 0xF0);
    }
 
    /* Save them in the PRCB */
    KeGetCurrentPrcb()->CpuID = TRUE;
    KeGetCurrentPrcb()->CpuType = (UCHAR)Type;
    KeGetCurrentPrcb()->CpuStep = (USHORT)Stepping;
}

KxRestoreFloatingPointState()

NTSTATUS NTAPI KxRestoreFloatingPointState

(

IN PKFLOATING_SAVE

FloatingState

)

Definition at line 655 of file cpu.c.

{
    UNREFERENCED_PARAMETER(FloatingState);
    return STATUS_SUCCESS;
}

KxSaveFloatingPointState()

NTSTATUS NTAPI KxSaveFloatingPointState

(

OUT PKFLOATING_SAVE

FloatingState

)

Definition at line 647 of file cpu.c.

{
    UNREFERENCED_PARAMETER(FloatingState);
    return STATUS_SUCCESS;
}

Variable Documentation

CmpAmdID

const CHAR CmpAmdID[] = "AuthenticAMD"

static

Definition at line 37 of file cpu.c.

Referenced by KiGetCpuVendor().

CmpCentaurID

const CHAR CmpCentaurID[] = "CentaurHauls"

static

Definition at line 38 of file cpu.c.

Referenced by KiGetCpuVendor().

CmpIntelID

const CHAR CmpIntelID[] = "GenuineIntel"

static

Definition at line 36 of file cpu.c.

Referenced by KiGetCpuVendor().

KeI386CpuStep

ULONG KeI386CpuStep

Definition at line 25 of file cpu.c.

KeI386CpuType

ULONG KeI386CpuType

Definition at line 24 of file cpu.c.

Referenced by KeInvalidateAllCaches().

KeI386MachineType

ULONG KeI386MachineType

Definition at line 26 of file cpu.c.

Referenced by KiInitializeMachineType().

KeI386NpxPresent

ULONG KeI386NpxPresent = 1

Definition at line 27 of file cpu.c.

Referenced by KeRestoreFloatingPointState(), and KeSaveFloatingPointState().

KeLargestCacheLine

ULONG KeLargestCacheLine = 0x40

Definition at line 28 of file cpu.c.

Referenced by KeGetRecommendedSharedDataAlignment(), and KiGetCacheInformation().

KiBootTss

KTSS64 KiBootTss

Definition at line 21 of file cpu.c.

KiDmaIoCoherency

ULONG KiDmaIoCoherency = 0

Definition at line 29 of file cpu.c.

Referenced by KeSetDmaIoCoherency(), and KiInitializeKernel().

KiSMTProcessorsPresent

BOOLEAN KiSMTProcessorsPresent

Definition at line 30 of file cpu.c.

Referenced by KiGetFeatureBits().

KiTbFlushTimeStamp

volatile LONG KiTbFlushTimeStamp

Definition at line 33 of file cpu.c.

Referenced by KeFlushEntireTb().