xt-sys/exectos
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Simplify stack page count calculation
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This commit is contained in:
Aiken Harris
2025-12-29 19:14:49 +01:00
parent 4c7c914a1c
commit f4c49e2f25
1 changed files with 5 additions and 6 deletions
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11
xtoskrnl/mm/kpool.cc
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@@ -30,7 +30,7 @@ XTSTATUS
MM::KernelPool::AllocateKernelStack(OUT PVOID *Stack, MM::KernelPool::AllocateKernelStack(OUT PVOID *Stack,
IN ULONG StackSize) IN ULONG StackSize)
{ {
PFN_COUNT StackPtes, StackPages; PFN_COUNT StackPages;
PMMPTE PointerPte, StackPte; PMMPTE PointerPte, StackPte;
MMPTE TempPte, InvalidPte; MMPTE TempPte, InvalidPte;
PFN_NUMBER PageFrameIndex; PFN_NUMBER PageFrameIndex;
@@ -40,11 +40,10 @@ MM::KernelPool::AllocateKernelStack(OUT PVOID *Stack,
*Stack = NULLPTR; *Stack = NULLPTR;
/* Convert the requested stack size into a page count */ /* Convert the requested stack size into a page count */
StackPtes = SIZE_TO_PAGES(StackSize); StackPages = SIZE_TO_PAGES(StackSize);
StackPages = StackPtes;
/* Reserve PTEs for the stack pages, plus a guard page */ /* Reserve PTEs for the stack pages, plus a guard page */
StackPte = MM::Pte::ReserveSystemPtes(StackPtes + 1, SystemPteSpace, 0); StackPte = MM::Pte::ReserveSystemPtes(StackPages + 1, SystemPteSpace, 0);
if(!StackPte) if(!StackPte)
{ {
/* Failed to reserve PTEs for the new kernel stack */ /* Failed to reserve PTEs for the new kernel stack */
@@ -84,10 +83,10 @@ MM::KernelPool::AllocateKernelStack(OUT PVOID *Stack,
} }
/* Zero the newly allocated stack memory, skipping the guard page */ /* Zero the newly allocated stack memory, skipping the guard page */
RTL::Memory::ZeroMemory(MM::Paging::GetPteVirtualAddress(MM::Paging::GetNextPte(StackPte)), MM_PAGE_SIZE * StackPtes); RTL::Memory::ZeroMemory(MM::Paging::GetPteVirtualAddress(MM::Paging::GetNextPte(StackPte)), MM_PAGE_SIZE * StackPages);
/* Return a pointer to the top of the new stack */ /* Return a pointer to the top of the new stack */
*Stack = MM::Paging::GetPteVirtualAddress(MM::Paging::AdvancePte(StackPte, StackPtes + 1)); *Stack = MM::Paging::GetPteVirtualAddress(MM::Paging::AdvancePte(StackPte, StackPages + 1));
return STATUS_SUCCESS; return STATUS_SUCCESS;
} }