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Use dedicated NMI stack on i686
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This commit is contained in:
Aiken Harris
2026-03-30 11:43:09 +02:00
parent e9aaeab982
commit 8c6c63465f
4 changed files with 27 additions and 14 deletions
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3
xtoskrnl/ar/i686/data.cc
View File

@@ -30,5 +30,8 @@ KPROCESSOR_BLOCK AR::ProcSup::InitialProcessorBlock;
/* Initial TSS */
KTSS AR::ProcSup::InitialTss;
/* Initial kernel NMI stack */
UCHAR AR::ProcSup::NmiStack[KERNEL_STACK_SIZE] = {};
/* NMI task gate */
UCHAR AR::ProcSup::NonMaskableInterruptTss[KTSS_IO_MAPS];

27
xtoskrnl/ar/i686/procsup.cc
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@@ -132,7 +132,7 @@ VOID
AR::ProcSup::InitializeProcessor(IN PVOID ProcessorStructures)
{
KDESCRIPTOR GdtDescriptor, IdtDescriptor;
PVOID KernelBootStack, KernelFaultStack;
PVOID KernelBootStack, KernelFaultStack, KernelNmiStack;
PKPROCESSOR_BLOCK ProcessorBlock;
PKGDTENTRY Gdt;
PKIDTENTRY Idt;
@@ -143,7 +143,7 @@ AR::ProcSup::InitializeProcessor(IN PVOID ProcessorStructures)
{
/* Assign CPU structures from provided buffer */
InitializeProcessorStructures(ProcessorStructures, &Gdt, &Tss, &ProcessorBlock,
&KernelBootStack, &KernelFaultStack);
&KernelBootStack, &KernelFaultStack, &KernelNmiStack);
/* Use global IDT */
Idt = InitialIdt;
@@ -156,6 +156,7 @@ AR::ProcSup::InitializeProcessor(IN PVOID ProcessorStructures)
Tss = &InitialTss;
KernelBootStack = &BootStack;
KernelFaultStack = &FaultStack;
KernelNmiStack = &NmiStack;
ProcessorBlock = &InitialProcessorBlock;
}
@@ -165,7 +166,7 @@ AR::ProcSup::InitializeProcessor(IN PVOID ProcessorStructures)
/* Initialize GDT, IDT and TSS */
InitializeGdt(ProcessorBlock);
InitializeIdt(ProcessorBlock);
InitializeTss(ProcessorBlock, KernelBootStack, KernelFaultStack);
InitializeTss(ProcessorBlock, KernelBootStack, KernelFaultStack, KernelNmiStack);
/* Set GDT and IDT descriptors */
GdtDescriptor.Base = Gdt;
@@ -381,7 +382,8 @@ AR::ProcSup::InitializeProcessorStructures(IN PVOID ProcessorStructures,
OUT PKTSS *Tss,
OUT PKPROCESSOR_BLOCK *ProcessorBlock,
OUT PVOID *KernelBootStack,
OUT PVOID *KernelFaultStack)
OUT PVOID *KernelFaultStack,
OUT PVOID *KernelNmiStack)
{
UINT_PTR Address;
@@ -392,8 +394,12 @@ AR::ProcSup::InitializeProcessorStructures(IN PVOID ProcessorStructures,
*KernelBootStack = (PVOID)Address;
Address += KERNEL_STACK_SIZE;
/* Assign a space for kernel fault stack, no advance needed as stack grows down */
/* Assign a space for kernel fault stack and advance */
*KernelFaultStack = (PVOID)Address;
Address += KERNEL_STACK_SIZE;
/* Assign a space for kernel NMI stack, no advance needed as stack grows down */
*KernelNmiStack = (PVOID)Address;
/* Assign a space for GDT and advance */
*Gdt = (PKGDTENTRY)(PVOID)Address;
@@ -439,7 +445,8 @@ XTAPI
VOID
AR::ProcSup::InitializeTss(IN PKPROCESSOR_BLOCK ProcessorBlock,
IN PVOID KernelBootStack,
IN PVOID KernelFaultStack)
IN PVOID KernelFaultStack,
IN PVOID KernelNmiStack)
{
/* Clear I/O map */
RtlSetMemory(ProcessorBlock->TssBase->IoMaps[0].IoMap, 0xFF, IOPM_FULL_SIZE);
@@ -471,7 +478,7 @@ AR::ProcSup::InitializeTss(IN PKPROCESSOR_BLOCK ProcessorBlock,
/* Initialize task gates for DoubleFault and NMI traps */
SetDoubleFaultTssEntry(ProcessorBlock, KernelFaultStack);
SetNonMaskableInterruptTssEntry(ProcessorBlock, KernelFaultStack);
SetNonMaskableInterruptTssEntry(ProcessorBlock, KernelNmiStack);
}
/**
@@ -701,7 +708,7 @@ AR::ProcSup::SetIdtGate(IN PKIDTENTRY Idt,
XTAPI
VOID
AR::ProcSup::SetNonMaskableInterruptTssEntry(IN PKPROCESSOR_BLOCK ProcessorBlock,
IN PVOID KernelFaultStack)
IN PVOID KernelNmiStack)
{
PKGDTENTRY TaskGateEntry, TssEntry;
PKTSS Tss;
@@ -719,8 +726,8 @@ AR::ProcSup::SetNonMaskableInterruptTssEntry(IN PKPROCESSOR_BLOCK ProcessorBlock
Tss->Flags = 0;
Tss->LDT = KGDT_R0_LDT;
Tss->CR3 = CpuFunc::ReadControlRegister(3);
Tss->Esp = (ULONG_PTR)KernelFaultStack;
Tss->Esp0 = (ULONG_PTR)KernelFaultStack;
Tss->Esp = (ULONG_PTR)KernelNmiStack;
Tss->Esp0 = (ULONG_PTR)KernelNmiStack;
Tss->Eip = PtrToUlong(ArTrapEntry[0x02]);
Tss->Cs = KGDT_R0_CODE;
Tss->Ds = KGDT_R3_DATA | RPL_MASK;

9
xtoskrnl/includes/ar/i686/procsup.hh
View File

@@ -25,6 +25,7 @@ namespace AR
STATIC KIDTENTRY InitialIdt[IDT_ENTRIES];
STATIC KPROCESSOR_BLOCK InitialProcessorBlock;
STATIC KTSS InitialTss;
STATIC UCHAR NmiStack[KERNEL_STACK_SIZE];
STATIC UCHAR NonMaskableInterruptTss[KTSS_IO_MAPS];
@@ -57,11 +58,13 @@ namespace AR
OUT PKTSS *Tss,
OUT PKPROCESSOR_BLOCK *ProcessorBlock,
OUT PVOID *KernelBootStack,
OUT PVOID *KernelFaultStack);
OUT PVOID *KernelFaultStack,
OUT PVOID *KernelNmiStack);
STATIC XTAPI VOID InitializeSegments(VOID);
STATIC XTAPI VOID InitializeTss(IN PKPROCESSOR_BLOCK ProcessorBlock,
IN PVOID KernelBootStack,
IN PVOID KernelFaultStack);
IN PVOID KernelFaultStack,
IN PVOID KernelNmiStack);
STATIC XTAPI VOID SetDoubleFaultTssEntry(IN PKPROCESSOR_BLOCK ProcessorBlock,
IN PVOID KernelFaultStack);
STATIC XTAPI VOID SetGdtEntry(IN PKGDTENTRY Gdt,
@@ -75,7 +78,7 @@ namespace AR
IN USHORT Selector,
IN ULONG_PTR Base);
STATIC XTAPI VOID SetNonMaskableInterruptTssEntry(IN PKPROCESSOR_BLOCK ProcessorBlock,
IN PVOID KernelFaultStack);
IN PVOID KernelNmiStack);
};
}