8.3 Obtaining Services Tables

DXE drivers may consume the UEFI Boot Services, UEFI Runtime Services, and DXE Services. In addition, a DXE driver can also refer to UEFI System Table.

UEFI Boot Services, UEFI Runtime Services, and UEFI System Table are defined in the UEFI Specification. DXE Services are defined in the PI Specification.

DXE driver can retrieve these tables via global variables provided by the following library classes:

Table 11 Reference to Services Tables for DXE Drivers

	`Global variable`	`Library Class`
UEFI System Table	`gST`	UefiBootServicesTableLib
UEFI Boot Services Table	`gBS`	UefiBootServicesTableLib
UEFI Runtime Services Table	`gRT`	UefiRuntimeServicesTableLib
DXE Services Table	`gDS`	DxeServicesTableLib

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