5.3 Get Service Tables
UEFI drivers may consume the UEFI Boot Services, UEFI Runtime Services, and UEFI System Tables that are defined in the UEFI Specification.
EDK II provides the UefiBootServicesTableLib and UefiRuntimeServicesTableLib libraries to facilitate developer to access those services. The following table lists the global variables provided by those libraries.

Table 10 Table Global Variables

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