Here are the data structures with brief descriptions:

ACPI_BOARD_INFO
cb_cbmem_tab
cb_console
cb_forward
cb_framebuffer
cb_header
cb_mainboard
cb_memory
cb_memory_range
cb_record
cb_serial
cb_string
cb_vdat
cbmem_entry
cbmem_root
cbuint64
CPU_SMMBASE
imd_entry
imd_root
MEMORY_MAP_ENTRY
MEMORY_MAP_INFO
NV_VARIABLE_INFO
PLD_GENERIC_REGISTER
PLD_S3_COMMUNICATION
PLD_SMM_REGISTERS
PLD_TO_BL_SMM_INFO
SERIAL_PORT_INFO
SMM_S3_INFO
SPI_FLASH_INFO
UNIVERSAL_PAYLOAD_BOOT_MANAGER_MENU
UNIVERSAL_PAYLOAD_PLATFORM_BOOT_MANAGER_OVERRIDE_PROTOCOL