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Add non-PAE paging support to BlMapPage
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Aiken Harris 2025-08-04 14:18:21 +02:00 committed by CodingWorkshop Signing Team
parent 0d3fb550f2
commit 1ffddfd0e2
Signed by: CodingWorkshop Signing Team
GPG Key ID: 6DC88369C82795D2
1 changed files with 51 additions and 29 deletions
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80
xtldr/arch/i686/memory.c
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@ -31,7 +31,7 @@ BlBuildPageMap(IN PXTBL_PAGE_MAPPING PageMap,
EFI_STATUS Status;
ULONG Index;
/* Check the page map level to determine which paging structure to create. */
/* Check the page map level to determine which paging structure to create */
if(PageMap->PageMapLevel == 3)
{
/* Allocate a page for the 3-level page map structure (PAE enabled) */
@ -189,55 +189,77 @@ BlMapPage(IN PXTBL_PAGE_MAPPING PageMap,
IN ULONG_PTR PhysicalAddress,
IN ULONG NumberOfPages)
{
SIZE_T Pml1Entry, Pml2Entry, Pml3Entry;
PHARDWARE_PTE Pml1, Pml2, Pml3;
SIZE_T PageFrameNumber;
PVOID Pml1, Pml2, Pml3;
SIZE_T Pml1Entry, Pml2Entry, Pml3Entry;
PHARDWARE_PTE PmlTable;
PHARDWARE_LEGACY_PTE LegacyPmlTable;
EFI_STATUS Status;
/* Set the Page Frame Number (PFN) */
PageFrameNumber = PhysicalAddress >> EFI_PAGE_SHIFT;
/* Do the recursive mapping */
/* Map all requested pages */
while(NumberOfPages > 0)
{
/* Calculate the indices in the various Page Tables from the virtual address */
Pml3Entry = (VirtualAddress & ((ULONGLONG)0x1FF << 30)) >> 30;
Pml2Entry = (VirtualAddress & ((ULONGLONG)0x1FF << 21)) >> 21;
Pml1Entry = (VirtualAddress & ((ULONGLONG)0x1FF << 12)) >> 12;
/* Check page map level */
/* Check the paging mode to use the correct page table structure */
if(PageMap->PageMapLevel == 3)
{
/* Three level Page Map */
Pml3 = ((PHARDWARE_PTE)(PageMap->PtePointer));
/* Calculate the indices for PAE page tables */
Pml3Entry = (VirtualAddress >> 30) & 0x3;
Pml2Entry = (VirtualAddress >> 21) & 0x1FF;
Pml1Entry = (VirtualAddress >> 12) & 0x1FF;
/* Get PML2 */
/* Get Page Directory Pointer Table (PML3) */
Pml3 = PageMap->PtePointer;
/* Get Page Directory (PML2) */
Status = BlpGetNextPageTable(PageMap, Pml3, Pml3Entry, &Pml2);
if(Status != STATUS_EFI_SUCCESS)
{
/* Memory mapping failure */
/* Failed to get the Page Table, abort mapping */
return Status;
}
/* Get Page Table (PML1) */
Status = BlpGetNextPageTable(PageMap, Pml2, Pml2Entry, &Pml1);
if(Status != STATUS_EFI_SUCCESS)
{
/* Failed to get the Page Table, abort mapping */
return Status;
}
/* Set the 64-bit PTE entry */
PmlTable = (PHARDWARE_PTE)Pml1;
RtlZeroMemory(&PmlTable[Pml1Entry], sizeof(HARDWARE_PTE));
PmlTable[Pml1Entry].PageFrameNumber = PageFrameNumber;
PmlTable[Pml1Entry].Valid = 1;
PmlTable[Pml1Entry].Writable = 1;
}
else
{
/* Two level Page Map */
Pml2 = ((PHARDWARE_PTE)(PageMap->PtePointer));
}
/* Calculate the indices for non-PAE page tables */
Pml2Entry = (VirtualAddress >> 22) & 0x3FF;
Pml1Entry = (VirtualAddress >> 12) & 0x3FF;
/* Get PML1 */
Status = BlpGetNextPageTable(PageMap, Pml2, Pml2Entry, &Pml1);
if(Status != STATUS_EFI_SUCCESS)
{
/* Memory mapping failure */
return Status;
}
/* Get Page Directory (PML2) */
Pml2 = PageMap->PtePointer;
/* Set paging entry settings */
RtlZeroMemory(&Pml1[Pml1Entry], sizeof(HARDWARE_PTE));
Pml1[Pml1Entry].PageFrameNumber = PageFrameNumber;
Pml1[Pml1Entry].Valid = 1;
Pml1[Pml1Entry].Writable = 1;
/* Get Page Table (PML1) */
Status = BlpGetNextPageTable(PageMap, Pml2, Pml2Entry, &Pml1);
if(Status != STATUS_EFI_SUCCESS)
{
/* Failed to get the Page Table, abort mapping */
return Status;
}
/* Set the 32-bit PTE entry */
LegacyPmlTable = (PHARDWARE_LEGACY_PTE)Pml1;
RtlZeroMemory(&LegacyPmlTable[Pml1Entry], sizeof(HARDWARE_LEGACY_PTE));
LegacyPmlTable[Pml1Entry].PageFrameNumber = (UINT32)PageFrameNumber;
LegacyPmlTable[Pml1Entry].Valid = 1;
LegacyPmlTable[Pml1Entry].Writable = 1;
}
/* Take next virtual address and PFN */
VirtualAddress += EFI_PAGE_SIZE;