xt-sys/exectos
xt-sys/exectos
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Zero-initialize Page Directory entries before use
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Aiken Harris 2025-07-30 16:49:49 +02:00 committed by CodingWorkshop Signing Team
parent c8787c3bd6
commit 3607a6d930
Signed by: CodingWorkshop Signing Team
GPG Key ID: 6DC88369C82795D2
1 changed files with 7 additions and 3 deletions
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10
xtldr/modules/xtos_o/i686/memory.c
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@ -24,6 +24,7 @@ EFI_STATUS
XtpMapHardwareMemoryPool(IN PXTBL_PAGE_MAPPING PageMap) XtpMapHardwareMemoryPool(IN PXTBL_PAGE_MAPPING PageMap)
{ {
EFI_PHYSICAL_ADDRESS Address; EFI_PHYSICAL_ADDRESS Address;
PHARDWARE_LEGACY_PTE LegacyPdeBase;
PHARDWARE_PTE PdeBase; PHARDWARE_PTE PdeBase;
XTSTATUS Status; XTSTATUS Status;
@ -45,6 +46,7 @@ XtpMapHardwareMemoryPool(IN PXTBL_PAGE_MAPPING PageMap)
PdeBase = (PHARDWARE_PTE)(((PHARDWARE_PTE)PageMap->PtePointer)[MM_HARDWARE_VA_START >> MM_PPI_SHIFT].PageFrameNumber << MM_PAGE_SHIFT); PdeBase = (PHARDWARE_PTE)(((PHARDWARE_PTE)PageMap->PtePointer)[MM_HARDWARE_VA_START >> MM_PPI_SHIFT].PageFrameNumber << MM_PAGE_SHIFT);
/* Make PDE valid */ /* Make PDE valid */
RtlZeroMemory(&PdeBase[(MM_HARDWARE_VA_START >> MM_PDI_SHIFT) & 0x1FF], sizeof(HARDWARE_PTE));
PdeBase[(MM_HARDWARE_VA_START >> MM_PDI_SHIFT) & 0x1FF].PageFrameNumber = Address >> MM_PAGE_SHIFT; PdeBase[(MM_HARDWARE_VA_START >> MM_PDI_SHIFT) & 0x1FF].PageFrameNumber = Address >> MM_PAGE_SHIFT;
PdeBase[(MM_HARDWARE_VA_START >> MM_PDI_SHIFT) & 0x1FF].Valid = 1; PdeBase[(MM_HARDWARE_VA_START >> MM_PDI_SHIFT) & 0x1FF].Valid = 1;
PdeBase[(MM_HARDWARE_VA_START >> MM_PDI_SHIFT) & 0x1FF].Writable = 1; PdeBase[(MM_HARDWARE_VA_START >> MM_PDI_SHIFT) & 0x1FF].Writable = 1;
@ -52,9 +54,11 @@ XtpMapHardwareMemoryPool(IN PXTBL_PAGE_MAPPING PageMap)
else else
{ {
/* Make PDE valid (PAE disabled) */ /* Make PDE valid (PAE disabled) */
((PHARDWARE_LEGACY_PTE)PageMap->PtePointer)[MM_HARDWARE_VA_START >> MM_PDI_LEGACY_SHIFT].Valid = 1; LegacyPdeBase = (PHARDWARE_LEGACY_PTE)PageMap->PtePointer;
((PHARDWARE_LEGACY_PTE)PageMap->PtePointer)[MM_HARDWARE_VA_START >> MM_PDI_LEGACY_SHIFT].PageFrameNumber = Address >> MM_PAGE_SHIFT; RtlZeroMemory(&LegacyPdeBase[MM_HARDWARE_VA_START >> MM_PDI_LEGACY_SHIFT], sizeof(HARDWARE_LEGACY_PTE));
((PHARDWARE_LEGACY_PTE)PageMap->PtePointer)[MM_HARDWARE_VA_START >> MM_PDI_LEGACY_SHIFT].Writable = 1; 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;
LegacyPdeBase[MM_HARDWARE_VA_START >> MM_PDI_LEGACY_SHIFT].Writable = 1;
} }
/* Return success */ /* Return success */