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gPeiTpmInitializedPpiGuid

The PPI GUID for that TPM is initialized.
Include/Ppi/TpmInitialized.h

PPI Information

PPI's Guid NamePPI's Guid
gPeiTpmInitializedPpiGuid{ 0xe9db0d58, 0xd48d, 0x47f6, { 0x9c, 0x6e, 0x6f, 0x40, 0xe8, 0x6c, 0x7b, 0x41 }}

Refer to Header File

SecurityPkg/Include/Ppi/TpmInitialized.h