MdePkg[all]  1.08
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gEfiSmmBase2ProtocolGuid

Include/Protocol/SmmBase2.h

PROTOCOL Information

PROTOCOL's Guid NamePROTOCOL's Guid
gEfiSmmBase2ProtocolGuid{ 0xf4ccbfb7, 0xf6e0, 0x47fd, { 0x9d, 0xd4, 0x10, 0xa8, 0xf1, 0x50, 0xc1, 0x91 }}

Refer to Header File

MdePkg/Include/Protocol/SmmBase2.h