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Fix boot image size alignment calculation
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This commit is contained in:
Aiken Harris
2026-02-07 00:30:41 +01:00
parent 2e0e085acb
commit 80ea0b49d0
1 changed files with 4 additions and 5 deletions
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9
xtoskrnl/mm/mmgr.cc
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@@ -26,18 +26,17 @@ MM::Manager::ComputeBootImageSize(OUT PPFN_NUMBER BootImageSize)
{ {
PKERNEL_INITIALIZATION_BLOCK InitializationBlock; PKERNEL_INITIALIZATION_BLOCK InitializationBlock;
PFN_NUMBER ImageSize; PFN_NUMBER ImageSize;
ULONG PteSize; ULONG_PTR Alignment;
/* Get the kernel initialization block */ /* Get the kernel initialization block */
InitializationBlock = KE::BootInformation::GetInitializationBlock(); InitializationBlock = KE::BootInformation::GetInitializationBlock();
/* Get the size of a PTE */ /* Calculate the alignment based on the PTE size */
PteSize = MM::Paging::GetPteSize(); Alignment = ((MM_PAGE_SIZE / MM::Paging::GetPteSize()) * MM_PAGE_SIZE);
/* Calculate the size of the boot image */ /* Calculate the size of the boot image */
ImageSize = InitializationBlock->BootImageSize * MM_PAGE_SIZE; ImageSize = InitializationBlock->BootImageSize * MM_PAGE_SIZE;
ImageSize = (ImageSize + ((MM_PAGE_SIZE / PteSize) * MM_PAGE_SIZE) - 1) & ImageSize = (ImageSize + Alignment - 1) & ~(Alignment - 1);
~(((MM_PAGE_SIZE / PteSize) * MM_PAGE_SIZE) - 1);
/* Return number of pages used by the boot image */ /* Return number of pages used by the boot image */
*BootImageSize = ImageSize / MM_PAGE_SIZE; *BootImageSize = ImageSize / MM_PAGE_SIZE;