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EmbeddedPkg/PrePiHobLib: Remove Non-RT Types from Mem Type Info HOB 

Removes the following types from the memory type information HOB
produced:

- `EfiBootServicesCode`
- `EfiBootServicesData`
- `EfiLoaderCode`
- `EfiLoaderData`

This follows the guidance in the whitepaper "A Tour Beyond BIOS
Memory Map and Practices in UEFI BIOS".

https://github.com/tianocore-docs/Docs/raw/master/White_Papers/A_Tour_Beyond_BIOS_Memory_Map_And_Practices_in_UEFI_BIOS_V2.pdf

"NOTE: We recommend a platform only define the ReservedMemory,
ACPINvs, ACPIReclaim,  RuntimeCode, RuntimeData in Memory Type
Information table, because OSes only request  these regions to be
consistent. There is no need to add BootServicesCode,
BootServicesData, LoaderCode, LoaderData in memory type information
table, because these regions will not be reserved during S4 resume."

Since these memory types are not tracked in memory type information
any longer it also reduces the number of resets that may need to
occur to update memory type buckets that are not needed.

Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
This commit is contained in:
Michael Kubacki 2024-10-24 19:08:03 -04:00 committed by mergify[bot]
parent d1372720a8
commit b904377d0d
2 changed files with 3 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
EmbeddedPkg/Library/PrePiHobLib/Hob.c
View File

@ -845,7 +845,7 @@ BuildMemoryTypeInformationHob (
VOID
)
{
EFI_MEMORY_TYPE_INFORMATION Info[10];
EFI_MEMORY_TYPE_INFORMATION Info[6];
Info[0].Type = EfiACPIReclaimMemory;
Info[0].NumberOfPages = PcdGet32 (PcdMemoryTypeEfiACPIReclaimMemory);
@ -857,18 +857,9 @@ BuildMemoryTypeInformationHob (
Info[3].NumberOfPages = PcdGet32 (PcdMemoryTypeEfiRuntimeServicesData);
Info[4].Type = EfiRuntimeServicesCode;
Info[4].NumberOfPages = PcdGet32 (PcdMemoryTypeEfiRuntimeServicesCode);
Info[5].Type = EfiBootServicesCode;
Info[5].NumberOfPages = PcdGet32 (PcdMemoryTypeEfiBootServicesCode);
Info[6].Type = EfiBootServicesData;
Info[6].NumberOfPages = PcdGet32 (PcdMemoryTypeEfiBootServicesData);
Info[7].Type = EfiLoaderCode;
Info[7].NumberOfPages = PcdGet32 (PcdMemoryTypeEfiLoaderCode);
Info[8].Type = EfiLoaderData;
Info[8].NumberOfPages = PcdGet32 (PcdMemoryTypeEfiLoaderData);
// Terminator for the list
Info[9].Type = EfiMaxMemoryType;
Info[9].NumberOfPages = 0;
Info[5].Type = EfiMaxMemoryType;
Info[5].NumberOfPages = 0;
BuildGuidDataHob (&gEfiMemoryTypeInformationGuid, &Info, sizeof (Info));
}

4
EmbeddedPkg/Library/PrePiHobLib/PrePiHobLib.inf
View File

@ -47,10 +47,6 @@
gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiReservedMemoryType
gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiRuntimeServicesData
gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiRuntimeServicesCode
gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiBootServicesCode
gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiBootServicesData
gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiLoaderCode
gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiLoaderData
[FeaturePcd]
gEmbeddedTokenSpaceGuid.PcdPrePiProduceMemoryTypeInformationHob