137 lines
4.6 KiB
C
137 lines
4.6 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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IN PVOID VirtualAddress,
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IN PEFI_LOADED_IMAGE_PROTOCOL ImageProtocol)
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{
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PLOADER_MEMORY_MAPPING Mapping;
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EFI_PHYSICAL_ADDRESS Address;
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PLIST_ENTRY ListEntry, ModulesList, ModulesListEntry;
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PXTBL_MODULE_INFO ModuleInfo;
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EFI_STATUS Status;
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/* Allocate pages for PML4 */
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Status = XtLdrProtocol->Memory.AllocatePages(1, &Address);
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if(Status != STATUS_EFI_SUCCESS)
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{
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/* Memory allocation failure */
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return Status;
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}
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/* Assign and zero-fill memory used by page mappings */
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PageMap->PtePointer = (PVOID)(UINT_PTR)Address;
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RtlZeroMemory(PageMap->PtePointer, EFI_PAGE_SIZE);
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/* Get list of XTLDR modules */
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ModulesList = XtLdrProtocol->Protocol.GetModulesList();
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ModulesListEntry = ModulesList->Flink;
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while(ModulesListEntry != ModulesList)
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{
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/* Get module info */
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ModuleInfo = CONTAIN_RECORD(ModulesListEntry, XTBL_MODULE_INFO, Flink);
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/* Map module code */
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Status = XtLdrProtocol->Memory.MapVirtualMemory(PageMap, ModuleInfo->ModuleBase, ModuleInfo->ModuleBase,
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EFI_SIZE_TO_PAGES(ModuleInfo->ModuleSize), LoaderFirmwareTemporary);
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if(Status != STATUS_EFI_SUCCESS)
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{
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/* Mapping module code failed */
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return Status;
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}
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/* Get next module */
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ModulesListEntry = ModulesListEntry->Flink;
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}
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/* Map XTLDR code */
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XtLdrProtocol->Memory.MapVirtualMemory(PageMap, ImageProtocol->ImageBase, ImageProtocol->ImageBase,
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EFI_SIZE_TO_PAGES(ImageProtocol->ImageSize), LoaderFirmwareTemporary);
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/* Add page mapping itself to memory mapping */
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Status = XtLdrProtocol->Memory.MapVirtualMemory(PageMap, NULL, PageMap->PtePointer, 1, LoaderMemoryData);
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if(Status != STATUS_EFI_SUCCESS)
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{
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/* Mapping PML4 failed */
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return Status;
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}
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/* Iterate through and map all the mappings*/
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XtLdrProtocol->Debug.Print(L"Mapping and dumping EFI memory:\n");
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ListEntry = PageMap->MemoryMap.Flink;
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while(ListEntry != &PageMap->MemoryMap)
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{
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/* Take mapping from the list */
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Mapping = CONTAIN_RECORD(ListEntry, LOADER_MEMORY_MAPPING, ListEntry);
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/* Check if virtual address is set */
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if(Mapping->VirtualAddress)
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{
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/* Dump memory mapping */
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XtLdrProtocol->Debug.Print(L" Type=%02lu, PhysicalBase=0x%016lx, VirtualBase=0x%016lx, Pages=%lu\n", Mapping->MemoryType,
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Mapping->PhysicalAddress, Mapping->VirtualAddress, Mapping->NumberOfPages);
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/* Map memory */
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Status = XtLdrProtocol->Memory.MapPage(PageMap, (UINT_PTR)Mapping->VirtualAddress,
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(UINT_PTR)Mapping->PhysicalAddress, Mapping->NumberOfPages);
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if(Status != STATUS_EFI_SUCCESS)
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{
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/* Memory mapping failed */
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return Status;
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}
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}
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/* Take next element */
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ListEntry = ListEntry->Flink;
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}
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/* Map zero page as well */
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XtLdrProtocol->Memory.MapPage(PageMap, 0, 0, 1);
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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->Console.Print(L"Failed to exit boot services (Status code: %lx)\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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