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Extract MapDescriptor logic and simplify memory mapping API
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This commit is contained in:
Aiken Harris
2026-01-12 22:46:04 +01:00
parent 34c33a3b53
commit 15edd98242
4 changed files with 73 additions and 60 deletions
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113
boot/xtldr/memory.cc
View File

@@ -4,6 +4,7 @@
* FILE: xtldr/memory.cc
* DESCRIPTION: XT Boot Loader memory management
* DEVELOPERS: Rafal Kupiec <belliash@codingworkshop.eu.org>
* Aiken Harris <harraiken91@gmail.com>
*/
#include <xtldr.hh>
@@ -308,17 +309,69 @@ Memory::InitializePageMap(OUT PXTBL_PAGE_MAPPING PageMap,
PageMap->PageSize = PageSize;
}
/**
* Maps memory descriptor to the page mapping structure.
*
* @param PageMap
* Supplies a pointer to the page mapping structure.
*
* @param Descriptor
* Supplies a pointer to EFI memory descriptor, which will be mapped.
*
* @param BaseAddress
* Supplies a base address, where EFI memory will be mapped.
*
* @return This routine returns a status code.
*
* @since XT 1.0
*/
XTCDECL
EFI_STATUS
Memory::MapDescriptor(IN OUT PXTBL_PAGE_MAPPING PageMap,
IN PEFI_MEMORY_DESCRIPTOR Descriptor,
IN ULONG_PTR BaseAddress)
{
LOADER_MEMORY_TYPE MemoryType;
/* Skip EFI reserved memory */
if(Descriptor->Type == EfiReservedMemoryType)
{
/* Skip EFI reserved memory */
return STATUS_EFI_SUCCESS;
}
/* Convert EFI memory type into XTLDR memory type */
MemoryType = Memory::GetLoaderMemoryType((EFI_MEMORY_TYPE)Descriptor->Type);
/* Do memory mappings depending on memory type */
if(MemoryType == LoaderFirmwareTemporary)
{
/* Map EFI firmware code */
return Memory::MapVirtualMemory(PageMap, Descriptor->PhysicalStart,
Descriptor->PhysicalStart, Descriptor->NumberOfPages, MemoryType);
}
else if(MemoryType != LoaderFree)
{
/* Add any non-free memory mappings based on provided base address */
return Memory::MapVirtualMemory(PageMap, (BaseAddress | Descriptor->PhysicalStart), Descriptor->PhysicalStart,
Descriptor->NumberOfPages, MemoryType);
}
else
{
/* Map all other memory as loader free */
return Memory::MapVirtualMemory(PageMap, (ULONGLONG)NULLPTR, Descriptor->PhysicalStart,
Descriptor->NumberOfPages, LoaderFree);
}
}
/**
* Adds EFI memory mapping to the page mapping structure.
*
* @param PageMap
* Supplies a pointer to the page mapping structure.
*
* @param MemoryMapAddress
* Supplies a virtual address, where EFI memory will be mapped.
*
* @param GetMemoryTypeRoutine
* Supplies a pointer to the routine which will be used to match EFI memory type to the OS memory type.
* @param BaseAddress
* Supplies a base address, where EFI memory will be mapped.
*
* @return This routine returns a status code.
*
@@ -327,11 +380,9 @@ Memory::InitializePageMap(OUT PXTBL_PAGE_MAPPING PageMap,
XTCDECL
EFI_STATUS
Memory::MapEfiMemory(IN OUT PXTBL_PAGE_MAPPING PageMap,
IN OUT PVOID *MemoryMapAddress,
IN PBL_GET_MEMTYPE_ROUTINE GetMemoryTypeRoutine)
IN ULONG_PTR BaseAddress)
{
PEFI_MEMORY_DESCRIPTOR Descriptor;
LOADER_MEMORY_TYPE MemoryType;
PEFI_MEMORY_MAP MemoryMap;
SIZE_T DescriptorCount;
ULONGLONG MaxAddress;
@@ -372,7 +423,7 @@ Memory::MapEfiMemory(IN OUT PXTBL_PAGE_MAPPING PageMap,
/* Check page map level */
if(PageMap->PageMapLevel == 2 || PageMap->PageMapLevel == 3)
{
/* Check if physical address starts beyond 4GB */
/* Check if physical address starts beyond limit */
if(Descriptor->PhysicalStart > MaxAddress)
{
/* Go to the next descriptor */
@@ -383,49 +434,17 @@ Memory::MapEfiMemory(IN OUT PXTBL_PAGE_MAPPING PageMap,
/* Check if memory descriptor exceeds the lowest physical page */
if(Descriptor->PhysicalStart + (Descriptor->NumberOfPages << EFI_PAGE_SHIFT) > MaxAddress)
{
/* Truncate memory descriptor to the 4GB */
/* Truncate memory descriptor to maximum supported address */
Descriptor->NumberOfPages = (((ULONGLONG)MaxAddress) - Descriptor->PhysicalStart) >> EFI_PAGE_SHIFT;
}
}
/* Map this descriptor and make sure it succeeded */
Status = MapDescriptor(PageMap, Descriptor, BaseAddress);
if(Status != STATUS_EFI_SUCCESS)
{
/* Skip EFI reserved memory */
if(Descriptor->Type == EfiReservedMemoryType)
{
/* Go to the next descriptor */
Descriptor = (PEFI_MEMORY_DESCRIPTOR)((PUCHAR)Descriptor + MemoryMap->DescriptorSize);
continue;
}
/* Convert EFI memory type into XTLDR memory type */
MemoryType = GetLoaderMemoryType((EFI_MEMORY_TYPE)Descriptor->Type);
/* Do memory mappings depending on memory type */
if(MemoryType == LoaderFirmwareTemporary)
{
/* Map EFI firmware code */
Status = MapVirtualMemory(PageMap, Descriptor->PhysicalStart,
Descriptor->PhysicalStart, Descriptor->NumberOfPages, MemoryType);
}
else if(MemoryType != LoaderFree)
{
/* Add any non-free memory mapping */
Status = MapVirtualMemory(PageMap, KSEG0_BASE + Descriptor->PhysicalStart, Descriptor->PhysicalStart,
Descriptor->NumberOfPages, MemoryType);
}
else
{
/* Map all other memory as loader free */
Status = MapVirtualMemory(PageMap, (ULONGLONG)NULLPTR, Descriptor->PhysicalStart,
Descriptor->NumberOfPages, LoaderFree);
}
/* Make sure memory mapping succeeded */
if(Status != STATUS_EFI_SUCCESS)
{
/* Mapping failed */
return Status;
}
/* Mapping failed */
return Status;
}
/* Grab next descriptor */