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gEfiPciRootBridgeIoProtocolGuid

Include/Protocol/PciRootBridgeIo.h

PROTOCOL Information

PROTOCOL's Guid NamePROTOCOL's Guid
gEfiPciRootBridgeIoProtocolGuid{ 0x2F707EBB, 0x4A1A, 0x11D4, { 0x9A, 0x38, 0x00, 0x90, 0x27, 0x3F, 0xC1, 0x4D }}

Refer to Header File

MdePkg/Include/Protocol/PciRootBridgeIo.h