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ArmPkg/BdsLib: Fixed manipulation of the Memory Map returned by GetMemoryMap() 

The UEFI specification mandates that software uses the DescriptorSize returned
by the GetMemoryMap() function to find the start of each EFI_MEMORY_DESCRIPTOR
in the MemoryMap array. This allows for future expansion of the EFI_MEMORY_DESCRIPTOR.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14447 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Olivier Martin 2013-06-27 18:18:24 +00:00 committed by oliviermartin
parent a3202839da
commit a58266e5fd
1 changed files with 15 additions and 6 deletions
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21
ArmPkg/Library/BdsLib/BdsLinuxFdt.c
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@ -354,6 +354,7 @@ PrepareFdt (
UINT64 CpuReleaseAddr;
UINTN MemoryMapSize;
EFI_MEMORY_DESCRIPTOR *MemoryMap;
EFI_MEMORY_DESCRIPTOR *MemoryMapPtr;
UINTN MapKey;
UINTN DescriptorSize;
UINT32 DescriptorVersion;
@ -483,24 +484,32 @@ PrepareFdt (
MemoryMapSize = 0;
Status = gBS->GetMemoryMap (&MemoryMapSize, MemoryMap, &MapKey, &DescriptorSize, &DescriptorVersion);
if (Status == EFI_BUFFER_TOO_SMALL) {
// The UEFI specification advises to allocate more memory for the MemoryMap buffer between successive
// calls to GetMemoryMap(), since allocation of the new buffer may potentially increase memory map size.
Pages = EFI_SIZE_TO_PAGES (MemoryMapSize) + 1;
MemoryMap = AllocatePages (Pages);
if (MemoryMap == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto FAIL_COMPLETE_FDT;
}
Status = gBS->GetMemoryMap (&MemoryMapSize, MemoryMap, &MapKey, &DescriptorSize, &DescriptorVersion);
}
// Go through the list and add the reserved region to the Device Tree
if (!EFI_ERROR(Status)) {
for (Index = 0; Index < (MemoryMapSize / sizeof(EFI_MEMORY_DESCRIPTOR)); Index++) {
if (IsLinuxReservedRegion ((EFI_MEMORY_TYPE)MemoryMap[Index].Type)) {
MemoryMapPtr = MemoryMap;
for (Index = 0; Index < (MemoryMapSize / DescriptorSize); Index++) {
if (IsLinuxReservedRegion ((EFI_MEMORY_TYPE)MemoryMapPtr->Type)) {
DEBUG((DEBUG_VERBOSE, "Reserved region of type %d [0x%X, 0x%X]\n",
MemoryMap[Index].Type,
(UINTN)MemoryMap[Index].PhysicalStart,
(UINTN)(MemoryMap[Index].PhysicalStart + MemoryMap[Index].NumberOfPages * EFI_PAGE_SIZE)));
err = fdt_add_mem_rsv(fdt, MemoryMap[Index].PhysicalStart, MemoryMap[Index].NumberOfPages * EFI_PAGE_SIZE);
MemoryMapPtr->Type,
(UINTN)MemoryMapPtr->PhysicalStart,
(UINTN)(MemoryMapPtr->PhysicalStart + MemoryMapPtr->NumberOfPages * EFI_PAGE_SIZE)));
err = fdt_add_mem_rsv(fdt, MemoryMapPtr->PhysicalStart, MemoryMapPtr->NumberOfPages * EFI_PAGE_SIZE);
if (err != 0) {
Print(L"Warning: Fail to add 'memreserve' (err:%d)\n", err);
}
}
MemoryMapPtr = (EFI_MEMORY_DESCRIPTOR*)((UINTN)MemoryMapPtr + DescriptorSize);
}
}