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Resolve potential PDE conflict in non-PAE boot path

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Aiken Harris 2025-08-11 20:59:00 +02:00 committed by CodingWorkshop Signing Team
parent bf291613a3
commit 2375a653fe
Signed by: CodingWorkshop Signing Team
GPG Key ID: 6DC88369C82795D2
1 changed files with 10 additions and 1 deletions
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11
xtldr/modules/xtos_o/i686/memory.c
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@ -88,8 +88,17 @@ XtpMapHardwareMemoryPool(IN PXTBL_PAGE_MAPPING PageMap)
}
else
{
/* Make PDE valid (PAE disabled) */
/* Get PDE base address (PAE disabled) */
LegacyPdeBase = (PHARDWARE_LEGACY_PTE)PageMap->PtePointer;
/* Check for a conflicting PDE */
if(LegacyPdeBase[MM_HARDWARE_VA_START >> MM_PDI_LEGACY_SHIFT].Valid)
{
/* PDE already exists and is valid, nothing to do */
return STATUS_EFI_SUCCESS;
}
/* Make PDE valid */
RtlZeroMemory(&LegacyPdeBase[MM_HARDWARE_VA_START >> MM_PDI_LEGACY_SHIFT], sizeof(HARDWARE_LEGACY_PTE));
LegacyPdeBase[MM_HARDWARE_VA_START >> MM_PDI_LEGACY_SHIFT].Valid = 1;
LegacyPdeBase[MM_HARDWARE_VA_START >> MM_PDI_LEGACY_SHIFT].PageFrameNumber = Address >> MM_PAGE_SHIFT;