EDK II Module Writer's Guide
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EDK II Module Writer's Guide
EDK II Module Writer's Guide
Tables
Figures
1 The Basics of EDK II
2 An EDK II Package
3 Module Development
4 UEFI Applications
5 UEFI Drivers
6 SEC Module
7 Pre-EFI Initialization Modules
8 DXE Drivers: non-UEFI drivers
8.1 Beginning with INF File
8.2 Write DXE Driver Entry Point
8.3 Obtaining Services Tables
8.4 Communication between DXE Drivers
8.5 Communication with PEIMs
8.6 Dependency Expressions
8.7 Handler for EVT_SIGNAL_EXIT_BOOT_SERVICES
8.8 DXE Runtime Driver
8.9 DXE SAL Driver
8.10 DXE SMM Driver
Appendix A Dynamic PCD
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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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8.2 Write DXE Driver Entry Point
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8.4 Communication between DXE Drivers
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Table 11 Reference to Services Tables for DXE Drivers