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Refine LDT setup and restore critical TSS fields for hardware exceptions
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This commit is contained in:
Aiken Harris
2026-03-30 20:29:43 +02:00
parent d2a7ae46ac
commit 40c4860548
2 changed files with 7 additions and 2 deletions
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6
xtoskrnl/ar/i686/procsup.cc
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@@ -216,7 +216,7 @@ AR::ProcSup::InitializeGdt(IN PKPROCESSOR_BLOCK ProcessorBlock)
SetGdtEntry(ProcessorBlock->GdtBase, KGDT_R0_PB, (ULONG_PTR)ProcessorBlock, sizeof(KPROCESSOR_BLOCK), KGDT_TYPE_DATA, KGDT_DPL_SYSTEM, 2);
SetGdtEntry(ProcessorBlock->GdtBase, KGDT_R3_TEB, 0x0, 0xFFF, KGDT_TYPE_DATA | KGDT_DESCRIPTOR_ACCESSED, KGDT_DPL_USER, 2);
SetGdtEntry(ProcessorBlock->GdtBase, KGDT_VDM_TILE, 0x0400, 0xFFFF, KGDT_TYPE_DATA, KGDT_DPL_USER, 0);
SetGdtEntry(ProcessorBlock->GdtBase, KGDT_R0_LDT, 0x0, 0x0, KGDT_TYPE_NONE, KGDT_DPL_SYSTEM, 0);
SetGdtEntry(ProcessorBlock->GdtBase, KGDT_R0_LDT, 0x0, 0x0, I686_LDT, KGDT_DPL_SYSTEM, 0);
SetGdtEntry(ProcessorBlock->GdtBase, KGDT_DF_TSS, 0x20000, 0xFFFF, I686_TSS, KGDT_DPL_SYSTEM, 0);
SetGdtEntry(ProcessorBlock->GdtBase, KGDT_NMI_TSS, 0x20000, 0xFFFF, KGDT_TYPE_CODE, KGDT_DPL_SYSTEM, 0);
SetGdtEntry(ProcessorBlock->GdtBase, KGDT_VDBS, 0xB8000, 0x3FFF, KGDT_TYPE_DATA, KGDT_DPL_SYSTEM, 0);
@@ -520,6 +520,7 @@ AR::ProcSup::SetDoubleFaultTssEntry(IN PKPROCESSOR_BLOCK ProcessorBlock,
/* Initialize DoubleFault TSS and set initial state */
Tss = (PKTSS)DoubleFaultTss;
Tss->IoMapBase = sizeof(KTSS);
Tss->Flags = 0;
Tss->LDT = 0;
Tss->CR3 = CpuFunc::ReadControlRegister(3);
@@ -531,6 +532,7 @@ AR::ProcSup::SetDoubleFaultTssEntry(IN PKPROCESSOR_BLOCK ProcessorBlock,
Tss->Es = KGDT_R3_DATA | RPL_MASK;
Tss->Fs = KGDT_R0_PB;
Tss->Ss = KGDT_R0_DATA;
Tss->Ss0 = KGDT_R0_DATA;
/* Setup DoubleFault TSS entry in Global Descriptor Table */
TssEntry = (PKGDTENTRY)(&(ProcessorBlock->GdtBase[KGDT_DF_TSS / sizeof(KGDTENTRY)]));
@@ -732,6 +734,7 @@ AR::ProcSup::SetNonMaskableInterruptTssEntry(IN PKPROCESSOR_BLOCK ProcessorBlock
/* Initialize NMI TSS and set initial state */
Tss = (PKTSS)NonMaskableInterruptTss;
Tss->IoMapBase = sizeof(KTSS);
Tss->Flags = 0;
Tss->LDT = 0;
Tss->CR3 = CpuFunc::ReadControlRegister(3);
@@ -743,6 +746,7 @@ AR::ProcSup::SetNonMaskableInterruptTssEntry(IN PKPROCESSOR_BLOCK ProcessorBlock
Tss->Es = KGDT_R3_DATA | RPL_MASK;
Tss->Fs = KGDT_R0_PB;
Tss->Ss = KGDT_R0_DATA;
Tss->Ss0 = KGDT_R0_DATA;
/* Setup NMI TSS entry in Global Descriptor Table */
TssEntry = (PKGDTENTRY)(&(ProcessorBlock->GdtBase[KGDT_NMI_TSS / sizeof(KGDTENTRY)]));