ULONG KeProcessorLevel;
ULONG KeProcessorRevision;
ULONG KeFeatureBits;
-ULONG KiFastSystemCallDisable = 1;
+ULONG KiFastSystemCallDisable;
ULONG KeI386NpxPresent = 0;
ULONG KiMXCsrMask = 0;
ULONG MxcsrFeatureMask = 0;
ULONG KeDcacheFlushCount = 0;
ULONG KeIcacheFlushCount = 0;
ULONG KiDmaIoCoherency = 0;
+ULONG KePrefetchNTAGranularity = 32;
CHAR KeNumberProcessors;
KAFFINITY KeActiveProcessors = 1;
BOOLEAN KiI386PentiumLockErrataPresent;
BOOLEAN KiSMTProcessorsPresent;
+/* The distance between SYSEXIT and IRETD return modes */
+UCHAR KiSystemCallExitAdjust;
+
+/* The offset that was applied -- either 0 or the value above */
+UCHAR KiSystemCallExitAdjusted;
+
+/* Whether the adjustment was already done once */
+BOOLEAN KiFastCallCopyDoneOnce;
+
/* Flush data */
volatile LONG KiTbFlushTimeStamp;
return __readmsr(Register);
}
+/* NSC/Cyrix CPU configuration register index */
+#define CX86_CCR1 0xc1
+
+/* NSC/Cyrix CPU indexed register access macros */
+static __inline
+ULONG
+getCx86(UCHAR reg)
+{
+ WRITE_PORT_UCHAR((PUCHAR)(ULONG_PTR)0x22, reg);
+ return READ_PORT_UCHAR((PUCHAR)(ULONG_PTR)0x23);
+}
+
+#define setCx86(reg, data) do { \
+ WRITE_PORT_UCHAR((PUCHAR)(ULONG_PTR)0x22,(reg)); \
+ WRITE_PORT_UCHAR((PUCHAR)(ULONG_PTR)0x23,(data)); \
+} while (0)
+
/* FUNCTIONS *****************************************************************/
VOID
NTAPI
+INIT_FUNCTION
KiSetProcessorType(VOID)
{
ULONG EFlags, NewEFlags;
ULONG
NTAPI
+INIT_FUNCTION
KiGetCpuVendor(VOID)
{
PKPRCB Prcb = KeGetCurrentPrcb();
Prcb->VendorString[sizeof(Prcb->VendorString) - sizeof(CHAR)] = ANSI_NULL;
/* Now check the CPU Type */
- if (!strcmp((PCHAR)Prcb->VendorString, CmpIntelID))
+ if (!strcmp(Prcb->VendorString, CmpIntelID))
{
return CPU_INTEL;
}
- else if (!strcmp((PCHAR)Prcb->VendorString, CmpAmdID))
+ else if (!strcmp(Prcb->VendorString, CmpAmdID))
{
return CPU_AMD;
}
- else if (!strcmp((PCHAR)Prcb->VendorString, CmpCyrixID))
+ else if (!strcmp(Prcb->VendorString, CmpCyrixID))
{
DPRINT1("Cyrix CPU support not fully tested!\n");
return CPU_CYRIX;
}
- else if (!strcmp((PCHAR)Prcb->VendorString, CmpTransmetaID))
+ else if (!strcmp(Prcb->VendorString, CmpTransmetaID))
{
DPRINT1("Transmeta CPU support not fully tested!\n");
return CPU_TRANSMETA;
}
- else if (!strcmp((PCHAR)Prcb->VendorString, CmpCentaurID))
+ else if (!strcmp(Prcb->VendorString, CmpCentaurID))
{
DPRINT1("Centaur CPU support not fully tested!\n");
return CPU_CENTAUR;
}
- else if (!strcmp((PCHAR)Prcb->VendorString, CmpRiseID))
+ else if (!strcmp(Prcb->VendorString, CmpRiseID))
{
DPRINT1("Rise CPU support not fully tested!\n");
return CPU_RISE;
ULONG
NTAPI
+INIT_FUNCTION
KiGetFeatureBits(VOID)
{
PKPRCB Prcb = KeGetCurrentPrcb();
ULONG Vendor;
ULONG FeatureBits = KF_WORKING_PTE;
- ULONG Reg[4], Dummy;
+ ULONG Reg[4], Dummy, Ccr1;
BOOLEAN ExtendedCPUID = TRUE;
ULONG CpuFeatures = 0;
/* Remove support for correct PTE support. */
FeatureBits &= ~KF_WORKING_PTE;
}
+
+ /* Virtualbox claims to have no SYSENTER support,
+ * which is false for processors >= Pentium Pro */
+ if(Prcb->CpuType >= 6)
+ {
+ Reg[3] |= 0x800;
+ }
/* Check if the CPU is too old to support SYSENTER */
- if ((Prcb->CpuType < 6) ||
- ((Prcb->CpuType == 6) && (Prcb->CpuStep < 0x0303)))
+ if ((Reg[0] & 0x0FFF3FFF) < 0x00000633)
{
/* Disable it */
Reg[3] &= ~0x800;
/* Cyrix CPUs */
case CPU_CYRIX:
- /* FIXME: CMPXCGH8B */
+ /* Workaround the "COMA" bug on 6x family of Cyrix CPUs */
+ if (Prcb->CpuType == 6 &&
+ Prcb->CpuStep <= 1)
+ {
+ /* Get CCR1 value */
+ Ccr1 = getCx86(CX86_CCR1);
+
+ /* Enable the NO_LOCK bit */
+ Ccr1 |= 0x10;
+
+ /* Set the new CCR1 value */
+ setCx86(CX86_CCR1, Ccr1);
+ }
+
+ /* Set the current features */
+ CpuFeatures = Reg[3];
break;
}
}
}
+
+ DPRINT1("Supported CPU features :\n");
+#define print_supported(kf_value) \
+ if(FeatureBits & kf_value) DPRINT1("\t" #kf_value "\n")
+ print_supported(KF_V86_VIS);
+ print_supported(KF_RDTSC);
+ print_supported(KF_CR4);
+ print_supported(KF_CMOV);
+ print_supported(KF_GLOBAL_PAGE);
+ print_supported(KF_LARGE_PAGE);
+ print_supported(KF_MTRR);
+ print_supported(KF_CMPXCHG8B);
+ print_supported(KF_MMX);
+ print_supported(KF_WORKING_PTE);
+ print_supported(KF_PAT);
+ print_supported(KF_FXSR);
+ print_supported(KF_FAST_SYSCALL);
+ print_supported(KF_XMMI);
+ print_supported(KF_3DNOW);
+ print_supported(KF_AMDK6MTRR);
+ print_supported(KF_XMMI64);
+ print_supported(KF_DTS);
+ print_supported(KF_NX_BIT);
+ print_supported(KF_NX_DISABLED);
+ print_supported(KF_NX_ENABLED);
+#undef print_supported
/* Return the Feature Bits */
return FeatureBits;
VOID
NTAPI
+INIT_FUNCTION
KiGetCacheInformation(VOID)
{
PKIPCR Pcr = (PKIPCR)KeGetPcr();
ULONG CacheRequests = 0, i;
ULONG CurrentRegister;
UCHAR RegisterByte;
+ ULONG Size, Associativity = 0, CacheLine = 64, CurrentSize = 0;
BOOLEAN FirstPass = TRUE;
/* Set default L2 size */
* (32MB), or from 0x80 to 0x89 (same size but
* 8-way associative.
*/
- if (((RegisterByte > 0x40) &&
- (RegisterByte <= 0x49)) ||
- ((RegisterByte > 0x80) &&
- (RegisterByte <= 0x89)))
+ if (((RegisterByte > 0x40) && (RegisterByte <= 0x47)) ||
+ ((RegisterByte > 0x78) && (RegisterByte <= 0x7C)) ||
+ ((RegisterByte > 0x80) && (RegisterByte <= 0x85)))
{
+ /* Compute associativity */
+ Associativity = 4;
+ if (RegisterByte >= 0x79) Associativity = 8;
+
/* Mask out only the first nibble */
- RegisterByte &= 0x0F;
-
- /* Set the L2 Cache Size */
- Pcr->SecondLevelCacheSize = 0x10000 <<
- RegisterByte;
+ RegisterByte &= 0x07;
+
+ /* Check if this cache is bigger than the last */
+ Size = 0x10000 << RegisterByte;
+ if ((Size / Associativity) > CurrentSize)
+ {
+ /* Set the L2 Cache Size and Associativity */
+ CurrentSize = Size / Associativity;
+ Pcr->SecondLevelCacheSize = Size;
+ Pcr->SecondLevelCacheAssociativity = Associativity;
+ }
+ }
+ else if ((RegisterByte > 0x21) && (RegisterByte <= 0x29))
+ {
+ /* Set minimum cache line size */
+ if (CacheLine < 128) CacheLine = 128;
+
+ /* Hard-code size/associativity */
+ Associativity = 8;
+ switch (RegisterByte)
+ {
+ case 0x22:
+ Size = 512 * 1024;
+ Associativity = 4;
+ break;
+
+ case 0x23:
+ Size = 1024 * 1024;
+ break;
+
+ case 0x25:
+ Size = 2048 * 1024;
+ break;
+
+ case 0x29:
+ Size = 4096 * 1024;
+ break;
+
+ default:
+ Size = 0;
+ break;
+ }
+
+ /* Check if this cache is bigger than the last */
+ if ((Size / Associativity) > CurrentSize)
+ {
+ /* Set the L2 Cache Size and Associativity */
+ CurrentSize = Size / Associativity;
+ Pcr->SecondLevelCacheSize = Size;
+ Pcr->SecondLevelCacheAssociativity = Associativity;
+ }
+ }
+ else if (((RegisterByte > 0x65) && (RegisterByte < 0x69)) ||
+ (RegisterByte == 0x2C) || (RegisterByte == 0xF0))
+ {
+ /* Indicates L1 cache line of 64 bytes */
+ KePrefetchNTAGranularity = 64;
+ }
+ else if (RegisterByte == 0xF1)
+ {
+ /* Indicates L1 cache line of 128 bytes */
+ KePrefetchNTAGranularity = 128;
+ }
+ else if (((RegisterByte >= 0x4A) && (RegisterByte <= 0x4C)) ||
+ (RegisterByte == 0x78) ||
+ (RegisterByte == 0x7D) ||
+ (RegisterByte == 0x7F) ||
+ (RegisterByte == 0x86) ||
+ (RegisterByte == 0x87))
+ {
+ /* Set minimum cache line size */
+ if (CacheLine < 64) CacheLine = 64;
+
+ /* Hard-code size/associativity */
+ switch (RegisterByte)
+ {
+ case 0x4A:
+ Size = 4 * 1024 * 1024;
+ Associativity = 8;
+ break;
+
+ case 0x4B:
+ Size = 6 * 1024 * 1024;
+ Associativity = 12;
+ break;
+
+ case 0x4C:
+ Size = 8 * 1024 * 1024;
+ Associativity = 16;
+ break;
+
+ case 0x78:
+ Size = 1 * 1024 * 1024;
+ Associativity = 4;
+ break;
+
+ case 0x7D:
+ Size = 2 * 1024 * 1024;
+ Associativity = 8;
+ break;
+
+ case 0x7F:
+ Size = 512 * 1024;
+ Associativity = 2;
+ break;
+
+ case 0x86:
+ Size = 512 * 1024;
+ Associativity = 4;
+ break;
+
+ case 0x87:
+ Size = 1 * 1024 * 1024;
+ Associativity = 8;
+ break;
+
+ default:
+ Size = 0;
+ break;
+ }
+
+ /* Check if this cache is bigger than the last */
+ if ((Size / Associativity) > CurrentSize)
+ {
+ /* Set the L2 Cache Size and Associativity */
+ CurrentSize = Size / Associativity;
+ Pcr->SecondLevelCacheSize = Size;
+ Pcr->SecondLevelCacheAssociativity = Associativity;
+ }
}
}
}
case CPU_AMD:
- /* Check if we support CPUID 0x80000006 */
- CPUID(0x80000000, &Data[0], &Dummy, &Dummy, &Dummy);
- if (Data[0] >= 6)
+ /* Check if we support CPUID 0x80000005 */
+ CPUID(0x80000000, &Data[0], &Data[1], &Data[2], &Data[3]);
+ if (Data[0] >= 0x80000006)
{
- /* Get 2nd level cache and tlb size */
- CPUID(0x80000006, &Dummy, &Dummy, &Data[2], &Dummy);
+ /* Get L1 size first */
+ CPUID(0x80000005, &Data[0], &Data[1], &Data[2], &Data[3]);
+ KePrefetchNTAGranularity = Data[2] & 0xFF;
+
+ /* Check if we support CPUID 0x80000006 */
+ CPUID(0x80000000, &Data[0], &Data[1], &Data[2], &Data[3]);
+ if (Data[0] >= 0x80000006)
+ {
+ /* Get 2nd level cache and tlb size */
+ CPUID(0x80000006, &Data[0], &Data[1], &Data[2], &Data[3]);
+
+ /* Cache line size */
+ CacheLine = Data[2] & 0xFF;
+
+ /* Hardcode associativity */
+ RegisterByte = Data[2] >> 12;
+ switch (RegisterByte)
+ {
+ case 2:
+ Associativity = 2;
+ break;
+
+ case 4:
+ Associativity = 4;
+ break;
+
+ case 6:
+ Associativity = 8;
+ break;
+
+ case 8:
+ case 15:
+ Associativity = 16;
+ break;
+
+ default:
+ Associativity = 1;
+ break;
+ }
+
+ /* Compute size */
+ Size = (Data[2] >> 16) << 10;
+
+ /* Hack for Model 6, Steping 300 */
+ if ((KeGetCurrentPrcb()->CpuType == 6) &&
+ (KeGetCurrentPrcb()->CpuStep == 0x300))
+ {
+ /* Stick 64K in there */
+ Size = 64 * 1024;
+ }
- /* Set the L2 Cache Size */
- Pcr->SecondLevelCacheSize = (Data[2] & 0xFFFF0000) >> 6;
+ /* Set the L2 Cache Size and associativity */
+ Pcr->SecondLevelCacheSize = Size;
+ Pcr->SecondLevelCacheAssociativity = Associativity;
+ }
}
break;
/* FIXME */
break;
}
+
+ /* Set the cache line */
+ if (CacheLine > KeLargestCacheLine) KeLargestCacheLine = CacheLine;
+ DPRINT1("Prefetch Cache: %d bytes\tL2 Cache: %d bytes\tL2 Cache Line: %d bytes\tL2 Cache Associativity: %d\n",
+ KePrefetchNTAGranularity,
+ Pcr->SecondLevelCacheSize,
+ KeLargestCacheLine,
+ Pcr->SecondLevelCacheAssociativity);
}
VOID
NTAPI
+INIT_FUNCTION
KiSetCR0Bits(VOID)
{
ULONG Cr0;
VOID
NTAPI
+INIT_FUNCTION
KiInitializeTSS2(IN PKTSS Tss,
IN PKGDTENTRY TssEntry OPTIONAL)
{
}
/* Now clear the I/O Map */
- RtlFillMemory(Tss->IoMaps[0].IoMap, 8096, -1);
+ ASSERT(IOPM_COUNT == 1);
+ RtlFillMemory(Tss->IoMaps[0].IoMap, IOPM_FULL_SIZE, 0xFF);
/* Initialize Interrupt Direction Maps */
p = (PUCHAR)(Tss->IoMaps[0].DirectionMap);
- RtlZeroMemory(p, 32);
+ RtlZeroMemory(p, IOPM_DIRECTION_MAP_SIZE);
/* Add DPMI support for interrupts */
p[0] = 4;
/* Initialize the default Interrupt Direction Map */
p = Tss->IntDirectionMap;
- RtlZeroMemory(Tss->IntDirectionMap, 32);
+ RtlZeroMemory(Tss->IntDirectionMap, IOPM_DIRECTION_MAP_SIZE);
/* Add DPMI support */
p[0] = 4;
VOID
FASTCALL
+INIT_FUNCTION
Ki386InitializeTss(IN PKTSS Tss,
IN PKIDTENTRY Idt,
IN PKGDTENTRY Gdt)
Tss = (PKTSS)KiDoubleFaultTSS;
KiInitializeTSS(Tss);
Tss->CR3 = __readcr3();
- Tss->Esp0 = PtrToUlong(KiDoubleFaultStack);
- Tss->Esp = PtrToUlong(KiDoubleFaultStack);
- Tss->Eip = PtrToUlong(KiTrap8);
+ Tss->Esp0 = KiDoubleFaultStack;
+ Tss->Esp = KiDoubleFaultStack;
+ Tss->Eip = PtrToUlong(KiTrap08);
Tss->Cs = KGDT_R0_CODE;
Tss->Fs = KGDT_R0_PCR;
Tss->Ss = Ke386GetSs();
Tss = (PKTSS)KiNMITSS;
KiInitializeTSS(Tss);
Tss->CR3 = __readcr3();
- Tss->Esp0 = PtrToUlong(KiDoubleFaultStack);
- Tss->Esp = PtrToUlong(KiDoubleFaultStack);
- Tss->Eip = PtrToUlong(KiTrap2);
+ Tss->Esp0 = KiDoubleFaultStack;
+ Tss->Esp = KiDoubleFaultStack;
+ Tss->Eip = PtrToUlong(KiTrap02);
Tss->Cs = KGDT_R0_CODE;
Tss->Fs = KGDT_R0_PCR;
Tss->Ss = Ke386GetSs();
VOID
NTAPI
+INIT_FUNCTION
KiInitializeMachineType(VOID)
{
/* Set the Machine Type we got from NTLDR */
ULONG_PTR
NTAPI
+INIT_FUNCTION
KiLoadFastSyscallMachineSpecificRegisters(IN ULONG_PTR Context)
{
/* Set CS and ESP */
VOID
NTAPI
+INIT_FUNCTION
KiRestoreFastSyscallReturnState(VOID)
{
- /* FIXME: NT has support for SYSCALL, IA64-SYSENTER, etc. */
-
/* Check if the CPU Supports fast system call */
if (KeFeatureBits & KF_FAST_SYSCALL)
{
- /* Do an IPI to enable it */
- KeIpiGenericCall(KiLoadFastSyscallMachineSpecificRegisters, 0);
+ /* Check if it has been disabled */
+ if (!KiFastSystemCallDisable)
+ {
+ /* Do an IPI to enable it */
+ KeIpiGenericCall(KiLoadFastSyscallMachineSpecificRegisters, 0);
+
+ /* It's enabled, so use the proper exit stub */
+ KiFastCallExitHandler = KiSystemCallSysExitReturn;
+ DPRINT1("Support for SYSENTER detected.\n");
+ }
+ else
+ {
+ /* Disable fast system call */
+ KeFeatureBits &= ~KF_FAST_SYSCALL;
+ KiFastCallExitHandler = KiSystemCallTrapReturn;
+ DPRINT1("Support for SYSENTER disabled.\n");
+ }
+ }
+ else
+ {
+ /* Use the IRET handler */
+ KiFastCallExitHandler = KiSystemCallTrapReturn;
+ DPRINT1("No support for SYSENTER detected.\n");
}
}
ULONG_PTR
NTAPI
+INIT_FUNCTION
Ki386EnableDE(IN ULONG_PTR Context)
{
/* Enable DE */
ULONG_PTR
NTAPI
+INIT_FUNCTION
Ki386EnableFxsr(IN ULONG_PTR Context)
{
/* Enable FXSR */
ULONG_PTR
NTAPI
+INIT_FUNCTION
Ki386EnableXMMIExceptions(IN ULONG_PTR Context)
{
PKIDTENTRY IdtEntry;
- /* Get the IDT Entry for Interrupt 19 */
- IdtEntry = &((PKIPCR)KeGetPcr())->IDT[19];
+ /* Get the IDT Entry for Interrupt 0x13 */
+ IdtEntry = &((PKIPCR)KeGetPcr())->IDT[0x13];
/* Set it up */
IdtEntry->Selector = KGDT_R0_CODE;
- IdtEntry->Offset = ((ULONG_PTR)KiTrap19 & 0xFFFF);
- IdtEntry->ExtendedOffset = ((ULONG_PTR)KiTrap19 >> 16) & 0xFFFF;
+ IdtEntry->Offset = ((ULONG_PTR)KiTrap13 & 0xFFFF);
+ IdtEntry->ExtendedOffset = ((ULONG_PTR)KiTrap13 >> 16) & 0xFFFF;
((PKIDT_ACCESS)&IdtEntry->Access)->Dpl = 0;
((PKIDT_ACCESS)&IdtEntry->Access)->Present = 1;
((PKIDT_ACCESS)&IdtEntry->Access)->SegmentType = I386_INTERRUPT_GATE;
VOID
NTAPI
+INIT_FUNCTION
KiI386PentiumLockErrataFixup(VOID)
{
KDESCRIPTOR IdtDescriptor;
RtlZeroMemory(Address, Size);
}
+VOID
+NTAPI
+KiSaveProcessorState(IN PKTRAP_FRAME TrapFrame,
+ IN PKEXCEPTION_FRAME ExceptionFrame)
+{
+ PKPRCB Prcb = KeGetCurrentPrcb();
+
+ //
+ // Save full context
+ //
+ Prcb->ProcessorState.ContextFrame.ContextFlags = CONTEXT_FULL |
+ CONTEXT_DEBUG_REGISTERS;
+ KeTrapFrameToContext(TrapFrame, NULL, &Prcb->ProcessorState.ContextFrame);
+
+ //
+ // Save control registers
+ //
+ KiSaveProcessorControlState(&Prcb->ProcessorState);
+}
+
+BOOLEAN
+NTAPI
+INIT_FUNCTION
+KiIsNpxPresent(VOID)
+{
+ ULONG Cr0;
+ USHORT Magic;
+
+ /* Set magic */
+ Magic = 0xFFFF;
+
+ /* Read CR0 and mask out FPU flags */
+ Cr0 = __readcr0() & ~(CR0_MP | CR0_TS | CR0_EM | CR0_ET);
+
+ /* Store on FPU stack */
+#ifdef _MSC_VER
+ __asm fninit;
+ __asm fnstsw Magic;
+#else
+ asm volatile ("fninit;" "fnstsw %0" : "+m"(Magic));
+#endif
+
+ /* Magic should now be cleared */
+ if (Magic & 0xFF)
+ {
+ /* You don't have an FPU -- enable emulation for now */
+ __writecr0(Cr0 | CR0_EM | CR0_TS);
+ return FALSE;
+ }
+
+ /* You have an FPU, enable it */
+ Cr0 |= CR0_ET;
+
+ /* Enable INT 16 on 486 and higher */
+ if (KeGetCurrentPrcb()->CpuType >= 3) Cr0 |= CR0_NE;
+
+ /* Set FPU state */
+ __writecr0(Cr0 | CR0_EM | CR0_TS);
+ return TRUE;
+}
+
+BOOLEAN
+NTAPI
+INIT_FUNCTION
+KiIsNpxErrataPresent(VOID)
+{
+ BOOLEAN ErrataPresent;
+ ULONG Cr0;
+ volatile double Value1, Value2;
+
+ /* Disable interrupts */
+ _disable();
+
+ /* Read CR0 and remove FPU flags */
+ Cr0 = __readcr0();
+ __writecr0(Cr0 & ~(CR0_MP | CR0_TS | CR0_EM));
+
+ /* Initialize FPU state */
+ Ke386FnInit();
+
+ /* Multiply the magic values and divide, we should get the result back */
+ Value1 = 4195835.0;
+ Value2 = 3145727.0;
+ ErrataPresent = (Value1 * Value2 / 3145727.0) != 4195835.0;
+
+ /* Restore CR0 */
+ __writecr0(Cr0);
+
+ /* Enable interrupts */
+ _enable();
+
+ /* Return if there's an errata */
+ return ErrataPresent;
+}
+
+VOID
+NTAPI
+KiFlushNPXState(IN PFLOATING_SAVE_AREA SaveArea)
+{
+ ULONG EFlags, Cr0;
+ PKTHREAD Thread, NpxThread;
+ PFX_SAVE_AREA FxSaveArea;
+
+ /* Save volatiles and disable interrupts */
+ EFlags = __readeflags();
+ _disable();
+
+ /* Save the PCR and get the current thread */
+ Thread = KeGetCurrentThread();
+
+ /* Check if we're already loaded */
+ if (Thread->NpxState != NPX_STATE_LOADED)
+ {
+ /* If there's nothing to load, quit */
+ if (!SaveArea) return;
+
+ /* Need FXSR support for this */
+ ASSERT(KeI386FxsrPresent == TRUE);
+
+ /* Check for sane CR0 */
+ Cr0 = __readcr0();
+ if (Cr0 & (CR0_MP | CR0_TS | CR0_EM))
+ {
+ /* Mask out FPU flags */
+ __writecr0(Cr0 & ~(CR0_MP | CR0_TS | CR0_EM));
+ }
+
+ /* Get the NPX thread and check its FPU state */
+ NpxThread = KeGetCurrentPrcb()->NpxThread;
+ if ((NpxThread) && (NpxThread->NpxState == NPX_STATE_LOADED))
+ {
+ /* Get the FX frame and store the state there */
+ FxSaveArea = KiGetThreadNpxArea(NpxThread);
+ Ke386FxSave(FxSaveArea);
+
+ /* NPX thread has lost its state */
+ NpxThread->NpxState = NPX_STATE_NOT_LOADED;
+ }
+
+ /* Now load NPX state from the NPX area */
+ FxSaveArea = KiGetThreadNpxArea(Thread);
+ Ke386FxStore(FxSaveArea);
+ }
+ else
+ {
+ /* Check for sane CR0 */
+ Cr0 = __readcr0();
+ if (Cr0 & (CR0_MP | CR0_TS | CR0_EM))
+ {
+ /* Mask out FPU flags */
+ __writecr0(Cr0 & ~(CR0_MP | CR0_TS | CR0_EM));
+ }
+
+ /* Get FX frame */
+ FxSaveArea = KiGetThreadNpxArea(Thread);
+ Thread->NpxState = NPX_STATE_NOT_LOADED;
+
+ /* Save state if supported by CPU */
+ if (KeI386FxsrPresent) Ke386FxSave(FxSaveArea);
+ }
+
+ /* Now save the FN state wherever it was requested */
+ if (SaveArea) Ke386FnSave(SaveArea);
+
+ /* Clear NPX thread */
+ KeGetCurrentPrcb()->NpxThread = NULL;
+
+ /* Add the CR0 from the NPX frame */
+ Cr0 |= NPX_STATE_NOT_LOADED;
+ Cr0 |= FxSaveArea->Cr0NpxState;
+ __writecr0(Cr0);
+
+ /* Restore interrupt state */
+ __writeeflags(EFlags);
+}
+
/* PUBLIC FUNCTIONS **********************************************************/
+/*
+ * @implemented
+ */
+VOID
+NTAPI
+KiCoprocessorError(VOID)
+{
+ PFX_SAVE_AREA NpxArea;
+
+ /* Get the FPU area */
+ NpxArea = KiGetThreadNpxArea(KeGetCurrentThread());
+
+ /* Set CR0_TS */
+ NpxArea->Cr0NpxState = CR0_TS;
+ __writecr0(__readcr0() | CR0_TS);
+}
+
/*
* @implemented
*/
projects / reactos.git / blobdiff