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:
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 |