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gEfiLegacySpiSmmControllerProtocolGuid

Include/Protocol/LegacySpiSmmController.h

PROTOCOL Information

PROTOCOL's Guid NamePROTOCOL's Guid
gEfiLegacySpiSmmControllerProtocolGuid{ 0x62331b78, 0xd8d0, 0x4c8c, { 0x8c, 0xcb, 0xd2, 0x7d, 0xfe, 0x32, 0xdb, 0x9b }}

Refer to Header File

MdePkg/Include/Protocol/LegacySpiSmmController.h