Here are the data structures with brief descriptions:

_EDKII_PEI_MP_SERVICES2_PPI
_EDKII_PEI_SHADOW_MICROCODE_PPI
_EFI_SM_MONITOR_INIT_PROTOCOL
_EFI_SMM_CPU_SERVICE_PROTOCOL
_MTRR_FIXED_SETTINGS_
_MTRR_SETTINGS_
_MTRR_VARIABLE_SETTING_
_MTRR_VARIABLE_SETTINGS_
_REPUBLISH_SEC_PPI_PPI
ACPI_CPU_DATA
CPU_CACHE_INFO
CPU_FEATURE_INIT_DATA
CPU_HOT_PLUG_DATA
CPU_REGISTER_TABLE
CPU_REGISTER_TABLE_ENTRY
CPU_STATUS_INFORMATION
EDKII_MICROCODE_PATCH_HOB
EDKII_PEI_MICROCODE_CPU_ID
FIXED_MTRR
MTRR_MEMORY_RANGE
REGISTER_CPU_FEATURE_FIRST_PROCESSOR
REGISTER_CPU_FEATURE_INFORMATION
VARIABLE_MTRR