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Add full paging support for AMD64 and i686 architectures, including PAE support
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This commit is contained in:
Rafal Kupiec
2022-12-11 20:14:04 +01:00
parent 324a88cc01
commit 0572b208f1
6 changed files with 502 additions and 11 deletions
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135
xtldr/amd64/memory.c
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@@ -36,6 +36,123 @@ BlCreateStack(IN PVOID *StackPtr,
: "rax", "rbx");
}
/**
* Builds the actual memory mapping page table and enables paging. This routine exits EFI boot services as well.
*
* @param MemoryMappings
* Supplies a pointer to linked list containing all memory mappings.
*
* @param VirtualAddress
* Supplies a pointer to the next valid, free and available virtual address.
*
* @param ImageProtocol
* A pointer to the EFI loaded image protocol with information about where in memory the loader code was placed.
*
* @param PtePointer
* Supplies a pointer to memory area containing a Page Table Entries (PTE).
*
* @return This routine returns a status code.
*
* @since XT 1.0
*/
EFI_STATUS
BlEnablePaging(IN PLIST_ENTRY MemoryMappings,
IN PVOID VirtualAddress,
IN PEFI_LOADED_IMAGE_PROTOCOL ImageProtocol,
IN PVOID *PtePointer)
{
UINT_PTR MapKey, DescriptorSize, DescriptorCount;
PEFI_MEMORY_DESCRIPTOR MemoryMap = NULL;
PLOADER_MEMORY_MAPPING Mapping;
EFI_PHYSICAL_ADDRESS Address;
PLIST_ENTRY ListEntry;
EFI_STATUS Status;
PVOID Stack;
/* Get EFI memory map */
Status = BlGetMemoryMap(&MemoryMap, &MapKey, &DescriptorSize, &DescriptorCount);
if(Status != STATUS_EFI_SUCCESS)
{
/* Unable to get memory map */
return Status;
}
/* Allocate pages for PML4 */
Status = BlEfiMemoryAllocatePages(1, &Address);
if(Status != STATUS_EFI_SUCCESS)
{
/* Memory allocation failure */
return Status;
}
/* Assign and zero-fill memory used by page mappings */
*PtePointer = (PVOID)(UINT_PTR)Address;
RtlZeroMemory(*PtePointer, EFI_PAGE_SIZE);
/* Map the stack */
BlGetStackPointer(&Stack);
Status = BlAddVirtualMemoryMapping(MemoryMappings, Stack, Stack, XTOS_KERNEL_STACK_SIZE,
LoaderOsloaderStack);
if(Status != STATUS_EFI_SUCCESS)
{
/* Mapping the stack failed */
return Status;
}
/* Map XTLDR code */
Status = BlAddVirtualMemoryMapping(MemoryMappings, ImageProtocol->ImageBase, ImageProtocol->ImageBase,
EFI_SIZE_TO_PAGES(ImageProtocol->ImageSize),
LoaderFirmwareTemporary);
if(Status != STATUS_EFI_SUCCESS)
{
/* Mapping the boot loader code failed */
return Status;
}
/* Add page mapping itself to memory mapping */
Status = BlAddVirtualMemoryMapping(MemoryMappings, NULL, *PtePointer, 1, LoaderMemoryData);
if(Status != STATUS_EFI_SUCCESS)
{
/* Mapping PML4 failed */
return Status;
}
/* Iterate through all mappings */
ListEntry = MemoryMappings->Flink;
while(ListEntry != MemoryMappings)
{
/* Take mapping from the list */
Mapping = CONTAIN_RECORD(ListEntry, LOADER_MEMORY_MAPPING, ListEntry);
/* Check if virtual address is set */
if(Mapping->VirtualAddress)
{
/* Map memory */
Status = BlMapVirtualMemory(MemoryMappings, (UINT_PTR)Mapping->VirtualAddress,
(UINT_PTR)Mapping->PhysicalAddress, Mapping->NumberOfPages,
FALSE, PtePointer);
if(Status != STATUS_EFI_SUCCESS)
{
/* Memory mapping failed */
return Status;
}
}
/* Take next element */
ListEntry = ListEntry->Flink;
}
/* Exit EFI Boot Services */
BlDbgPrint(L"Exiting EFI boot services\n");
EfiSystemTable->BootServices->ExitBootServices(EfiImageHandle, MapKey);
/* Write PML4 to CR3 */
HlWriteCR3((UINT_PTR)*PtePointer);
/* Return success */
return STATUS_EFI_SUCCESS;
}
/**
* This routine does the actual virtual memory mapping.
*
@@ -51,6 +168,9 @@ BlCreateStack(IN PVOID *StackPtr,
* @param NumberOfPages
* Supplies a number of the pages of the mapping.
*
* @param PaeExtension
* Specifies whether Physical Address Extension (PAE) is supported by the hardware. Not used on AMD64.
*
* @param PtePointer
* Supplies a pointer to an array of pointers to page table entries.
*
@@ -63,6 +183,7 @@ BlMapVirtualMemory(IN PLIST_ENTRY MemoryMappings,
IN UINT_PTR VirtualAddress,
IN UINT_PTR PhysicalAddress,
IN UINT NumberOfPages,
IN BOOLEAN PaeExtension,
IN OUT PVOID *PtePointer)
{
PHARDWARE_PTE PageDirectoryPointTable, PageDirectory, PageTable;
@@ -101,10 +222,10 @@ BlMapVirtualMemory(IN PLIST_ENTRY MemoryMappings,
return Status;
}
/* Zero memory */
/* Fill allocated memory with zeros */
RtlZeroMemory((PVOID)(UINT_PTR)Address, EFI_PAGE_SIZE);
/* Set paging entry setting */
/* Set paging entry settings */
((PHARDWARE_PTE)(*PtePointer))[Pml4Index].PageFrameNumber = Address / EFI_PAGE_SIZE;
((PHARDWARE_PTE)(*PtePointer))[Pml4Index].Valid = 1;
((PHARDWARE_PTE)(*PtePointer))[Pml4Index].Write = 1;
@@ -135,10 +256,10 @@ BlMapVirtualMemory(IN PLIST_ENTRY MemoryMappings,
return Status;
}
/* Zero memory */
/* Fill allocated memory with zeros */
RtlZeroMemory((PVOID)(UINT_PTR)Address, EFI_PAGE_SIZE);
/* Set paging entry setting */
/* Set paging entry settings */
PageDirectoryPointTable[PdpIndex].PageFrameNumber = Address / EFI_PAGE_SIZE;
PageDirectoryPointTable[PdpIndex].Valid = 1;
PageDirectoryPointTable[PdpIndex].Write = 1;
@@ -169,10 +290,10 @@ BlMapVirtualMemory(IN PLIST_ENTRY MemoryMappings,
return Status;
}
/* Zero memory */
/* Fill allocated memory with zeros */
RtlZeroMemory((PVOID)(UINT_PTR)Address, EFI_PAGE_SIZE);
/* Set paging entry setting */
/* Set paging entry settings */
PageDirectory[PdIndex].PageFrameNumber = Address / EFI_PAGE_SIZE;
PageDirectory[PdIndex].Valid = 1;
PageDirectory[PdIndex].Write = 1;
@@ -186,7 +307,7 @@ BlMapVirtualMemory(IN PLIST_ENTRY MemoryMappings,
PageTable = (PHARDWARE_PTE)(UINT_PTR)Pointer;
}
/* Set paging entry setting */
/* Set paging entry settings */
PageTable[PtIndex].PageFrameNumber = PageFrameNumber;
PageTable[PtIndex].Valid = 1;
PageTable[PtIndex].Write = 1;