43_get_service_tables.md

4.3 Get Service Tables

UEFI Application may consume the UEFI Boot Services, UEFI Runtime Services and UEFI System Table.

Refer to UEFI Specification for definitions and detailed descriptions of UEFI Boot Services, UEFI Runtime Services, and UEFI System Table.

EDK II provides UefiBootServicesTableLib, UefiBootServicesTableLib and

UefiRuntimeServicesTableLib to facilitate developer in accessing those services. The following table lists the global symbol provided by those libraries.

Table 8 Global Symbol can be used by UEFI Application

	Global Variable	Library Class
UEFI System Table	gST	UefiBootServicesTableLib
UEFI Boot Services Table	gBS	UefiBootServicesTableLib
UEFI Runtime Services Table	gRT	UefiRuntimeServicesTableLib