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UefiPayloadPkg: Add PCD to control PCI DMA memory above 4GB

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PCI Root Bridge is allowed to allocate DMA memory below 4GB by default,
this policy does not applicable to all platform. For instance, QEMU
SBSA refernce platform configure system memory base to be 0x10000000000,
it makes all available memory resides above 0x10000000000.

To make DmaAbove4G member of structure RootBridge flexible, use PCD to
control behavior of DmaAbove4G.

Signed-off-by: Ajan Zhong <ajan.zhong@newfw.com>
This commit is contained in:
Ajan Zhong
2026-01-21 11:29:41 +00:00
committed by mergify[bot]
parent 22122aed0d
commit 6f536c0226
4 changed files with 8 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
UefiPayloadPkg/Library/FdtParserLib/FdtParseLib.inf
+1
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@@ -53,6 +53,7 @@
gUefiPayloadPkgTokenSpaceGuid.PcdPciReservedPMemAbove4GBBase
gUefiPayloadPkgTokenSpaceGuid.PcdPciReservedPMemAbove4GBLimit
gUefiPayloadPkgTokenSpaceGuid.SizeOfIoSpace
gUefiPayloadPkgTokenSpaceGuid.PcdPciAllocateMemoryAbove4GB
[BuildOptions]
UefiPayloadPkg/Library/FdtParserLib/FdtParserLib.c
+1 -1
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@@ -774,7 +774,7 @@ ParsePciRootBridge (
mPciRootBridgeInfo->RootBridge[RbIndex].PMem.Limit = PcdGet32 (PcdPciReservedPMemLimit);
mPciRootBridgeInfo->RootBridge[RbIndex].UID = RbIndex;
mPciRootBridgeInfo->RootBridge[RbIndex].HID = EISA_PNP_ID (0x0A03);
mPciRootBridgeInfo->RootBridge[RbIndex].DmaAbove4G = FALSE;
mPciRootBridgeInfo->RootBridge[RbIndex].DmaAbove4G = PcdGetBool (PcdPciAllocateMemoryAbove4GB);
Data32 = (UINT32 *)(PropertyPtr->Data);
for (Base = 0; Base < TempLen / sizeof (UINT32); Base = Base + DWORDS_TO_NEXT_ADDR_TYPE) {
UefiPayloadPkg/UefiPayloadPkg.dec
+3
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@@ -113,3 +113,6 @@ gUefiPayloadPkgTokenSpaceGuid.PcdFDTPageSize|8|UINT8|0x0000002C
#- PcdUseUniversalPayloadSerialPort is TRUE, Serial Port parameters will be updated
#- PcdUseUniversalPayloadSerialPort is FALSE, Serial Port parameters are fixed
gUefiPayloadPkgTokenSpaceGuid.PcdUseUniversalPayloadSerialPort|TRUE|BOOLEAN|0x0000002D
## Indicates whether allows PCI Root Bridge to allocate DMA memory resource above 4G
gUefiPayloadPkgTokenSpaceGuid.PcdPciAllocateMemoryAbove4GB|FALSE|BOOLEAN|0x0000002E
UefiPayloadPkg/UefiPayloadPkg.dsc
+3
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@@ -662,6 +662,9 @@
gEfiSecurityPkgTokenSpaceGuid.PcdRemovableMediaImageVerificationPolicy|0x04
!endif
## Whether allows PCI RB to allocate DMA memory above 4GB
gUefiPayloadPkgTokenSpaceGuid.PcdPciAllocateMemoryAbove4GB|FALSE
[PcdsFixedAtBuild.AARCH64]
# System Memory Base -- fixed at 0x4000_0000
gArmTokenSpaceGuid.PcdSystemMemoryBase|0x40000000