62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/**
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* PROJECT: ExectOS
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* COPYRIGHT: See COPYING.md in the top level directory
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* FILE: xtldr/amd64/memory.c
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* DESCRIPTION: EFI memory management for AMD64 target
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* DEVELOPERS: Rafal Kupiec <belliash@codingworkshop.eu.org>
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*/
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#include <xtos.h>
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/**
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* Builds the actual memory mapping page table and enables paging. This routine exits EFI boot services as well.
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*
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* @param MemoryMappings
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* Supplies a pointer to linked list containing all memory mappings.
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*
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* @param VirtualAddress
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* Supplies a pointer to the next valid, free and available virtual address.
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*
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* @param ImageProtocol
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* A pointer to the EFI loaded image protocol with information about where in memory the loader code was placed.
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*
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* @param PtePointer
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* Supplies a pointer to memory area containing a Page Table Entries (PTE).
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*
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* @return This routine returns a status code.
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*
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* @since XT 1.0
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*/
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XTCDECL
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EFI_STATUS
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XtEnablePaging(IN PXTBL_PAGE_MAPPING PageMap)
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{
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EFI_STATUS Status;
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/* Build page map */
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Status = XtLdrProtocol->Memory.BuildPageMap(PageMap, 0xFFFFF6FB7DBED000);
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if(Status != STATUS_EFI_SUCCESS)
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{
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/* Failed to build page map */
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XtLdrProtocol->Debug.Print(L"Failed to build page map (Status code: %zX)\n", Status);
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return Status;
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}
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/* Exit EFI Boot Services */
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XtLdrProtocol->Debug.Print(L"Exiting EFI boot services\n");
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Status = XtLdrProtocol->Util.ExitBootServices();
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if(Status != STATUS_EFI_SUCCESS)
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{
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/* Failed to exit boot services */
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XtLdrProtocol->Debug.Print(L"Failed to exit boot services (Status code: %zX)\n", Status);
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return STATUS_EFI_ABORTED;
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}
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/* Write PML4 to CR3 */
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ArWriteControlRegister(3, (UINT_PTR)PageMap->PtePointer);
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/* Return success */
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return STATUS_EFI_SUCCESS;
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}
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