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reactos/ntoskrnl/ke/amd64/cpu.c
Timo Kreuzer 410b1030c0 [NTOS:KE/x64] Implement detection of more KF_* feature flags 
- Detect KF_SSSE3, KF_SSE4_1, KF_SSE4_2, KF_RDRAND, KF_BRANCH, KF_SLAT, KF_GENUINE_INTEL, KF_AUTHENTICAMD, KF_ACNT2, KF_SMEP, KF_SMAP, KF_RDWRFSGSBASE, KF_XSAVEOPT, KF_XSAVES, KF_HUGEPAGE, KF_RDTSCP
2023-10-03 19:45:44 +03:00

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/*
* PROJECT: ReactOS Kernel
* LICENSE: GPL - See COPYING in the top level directory
* FILE: ntoskrnl/ke/amd64/cpu.c
* PURPOSE: Routines for CPU-level support
* PROGRAMMERS: Alex Ionescu (alex.ionescu@reactos.org)
* Timo Kreuzer (timo.kreuzer@reactos.org)
*/
/* INCLUDES *****************************************************************/
#include <ntoskrnl.h>
#include <x86x64/Cpuid.h>
#include <x86x64/Msr.h>
#define NDEBUG
#include <debug.h>
/* GLOBALS *******************************************************************/
/* The Boot TSS */
KTSS64 KiBootTss;
/* CPU Features and Flags */
ULONG KeI386CpuType;
ULONG KeI386CpuStep;
ULONG KeI386MachineType;
ULONG KeI386NpxPresent = 1;
ULONG KeLargestCacheLine = 0x40;
ULONG KiDmaIoCoherency = 0;
BOOLEAN KiSMTProcessorsPresent;
/* Flush data */
volatile LONG KiTbFlushTimeStamp;
/* CPU Signatures */
static const CHAR CmpIntelID[] = "GenuineIntel";
static const CHAR CmpAmdID[] = "AuthenticAMD";
static const CHAR CmpCentaurID[] = "CentaurHauls";
typedef union _CPU_SIGNATURE
{
struct
{
ULONG Step : 4;
ULONG Model : 4;
ULONG Family : 4;
ULONG Unused : 4;
ULONG ExtendedModel : 4;
ULONG ExtendedFamily : 8;
ULONG Unused2 : 4;
};
ULONG AsULONG;
} CPU_SIGNATURE;
/* FUNCTIONS *****************************************************************/
ULONG
NTAPI
KiGetCpuVendor(VOID)
{
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;
}
VOID
NTAPI
KiSetProcessorType(VOID)
{
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;
}
/*!
\brief Evaluates the KeFeatureFlag bits for the current CPU.
\return The feature flags for this CPU.
\see 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
*/
ULONG64
NTAPI
KiGetFeatureBits(VOID)
{
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;
}
#if DBG
VOID
KiReportCpuFeatures(IN PKPRCB Prcb)
{
ULONG CpuFeatures = 0;
CPU_INFO CpuInfo;
if (Prcb->CpuVendor)
{
KiCpuId(&CpuInfo, 1);
CpuFeatures = CpuInfo.Edx;
}
DPRINT1("Supported CPU features: ");
#define print_kf_bit(kf_value) if (Prcb->FeatureBits & kf_value) DbgPrint(#kf_value " ")
print_kf_bit(KF_SMEP);
print_kf_bit(KF_RDTSC);
print_kf_bit(KF_CR4);
print_kf_bit(KF_CMOV);
print_kf_bit(KF_GLOBAL_PAGE);
print_kf_bit(KF_LARGE_PAGE);
print_kf_bit(KF_MTRR);
print_kf_bit(KF_CMPXCHG8B);
print_kf_bit(KF_MMX);
print_kf_bit(KF_DTS);
print_kf_bit(KF_PAT);
print_kf_bit(KF_FXSR);
print_kf_bit(KF_FAST_SYSCALL);
print_kf_bit(KF_XMMI);
print_kf_bit(KF_3DNOW);
print_kf_bit(KF_XSAVEOPT);
print_kf_bit(KF_XMMI64);
print_kf_bit(KF_BRANCH);
print_kf_bit(KF_00040000);
print_kf_bit(KF_SSE3);
print_kf_bit(KF_CMPXCHG16B);
print_kf_bit(KF_AUTHENTICAMD);
print_kf_bit(KF_ACNT2);
print_kf_bit(KF_XSTATE);
print_kf_bit(KF_GENUINE_INTEL);
print_kf_bit(KF_SLAT);
print_kf_bit(KF_VIRT_FIRMWARE_ENABLED);
print_kf_bit(KF_RDWRFSGSBASE);
print_kf_bit(KF_NX_BIT);
print_kf_bit(KF_NX_DISABLED);
print_kf_bit(KF_NX_ENABLED);
print_kf_bit(KF_RDRAND);
print_kf_bit(KF_SMAP);
print_kf_bit(KF_RDTSCP);
print_kf_bit(KF_HUGEPAGE);
print_kf_bit(KF_XSAVES);
print_kf_bit(KF_FPU_LEAKAGE);
print_kf_bit(KF_CAT);
print_kf_bit(KF_CET_SS);
print_kf_bit(KF_SSSE3);
print_kf_bit(KF_SSE4_1);
print_kf_bit(KF_SSE4_2);
#undef print_kf_bit
#define print_cf(cpu_flag) if (CpuFeatures & cpu_flag) DbgPrint(#cpu_flag " ")
print_cf(X86_FEATURE_PAE);
print_cf(X86_FEATURE_HT);
#undef print_cf
DbgPrint("\n");
}
#endif // DBG
VOID
NTAPI
KiGetCacheInformation(VOID)
{
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;
}
}
VOID
NTAPI
KeFlushCurrentTb(VOID)
{
/* Flush the TLB by resetting CR3 */
__writecr3(__readcr3());
}
VOID
NTAPI
KiRestoreProcessorControlState(PKPROCESSOR_STATE ProcessorState)
{
/* 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);
}
VOID
NTAPI
KiSaveProcessorControlState(OUT PKPROCESSOR_STATE ProcessorState)
{
/* 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);
}
VOID
NTAPI
KeFlushEntireTb(IN BOOLEAN Invalid,
IN BOOLEAN AllProcessors)
{
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);
}
KAFFINITY
NTAPI
KeQueryActiveProcessors(VOID)
{
PAGED_CODE();
/* Simply return the number of active processors */
return KeActiveProcessors;
}
NTSTATUS
NTAPI
KxSaveFloatingPointState(OUT PKFLOATING_SAVE FloatingState)
{
UNREFERENCED_PARAMETER(FloatingState);
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
KxRestoreFloatingPointState(IN PKFLOATING_SAVE FloatingState)
{
UNREFERENCED_PARAMETER(FloatingState);
return STATUS_SUCCESS;
}
BOOLEAN
NTAPI
KeInvalidateAllCaches(VOID)
{
/* Invalidate all caches */
__wbinvd();
return TRUE;
}
/*
* @implemented
*/
ULONG
NTAPI
KeGetRecommendedSharedDataAlignment(VOID)
{
/* Return the global variable */
return KeLargestCacheLine;
}
/*
* @implemented
*/
VOID
__cdecl
KeSaveStateForHibernate(IN PKPROCESSOR_STATE State)
{
/* Capture the context */
RtlCaptureContext(&State->ContextFrame);
/* Capture the control state */
KiSaveProcessorControlState(State);
}
/*
* @implemented
*/
VOID
NTAPI
KeSetDmaIoCoherency(IN ULONG Coherency)
{
/* Save the coherency globally */
KiDmaIoCoherency = Coherency;
}
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