Linear Executable Format (LE)

LE format is used in VxD drivers and DOS4GW executables.

In VxD drivers the first entry point in the Entry_Table points to the Virtual Driver Descriptor. Its layout it given below:

VxD_Desc_Block STRUC
DDB_Next                dd  ?                   ; VMM RESERVED FIELD
DDB_SDK_Version         dw  DDK_Version         ; VMM RESERVED FIELD
DDB_Req_Device_Number   dw  Undefined_Device_ID ; Required device number
DDB_Dev_Major_Version   db  0                   ; Major device number
DDB_Dev_Minor_Version   db  0                   ; Minor device number
DDB_Flags               dw  0                   ; Flags for init calls complete
DDB_Name                db  "        "          ; Device name
DDB_Init_Order          dd  Undefined_Init_Order; Initialization Order
DDB_Control_Proc        dd  ?                   ; Offset of control procedure
DDB_V86_API_Proc        dd  0                   ; Offset of API procedure (or 0)
DDB_PM_API_Proc         dd  0                   ; Offset of API procedure (or 0)
DDB_V86_API_CSIP        dd  0                   ; CS:IP of API entry point
DDB_PM_API_CSIP         dd  0                   ; CS:IP of API entry point
DDB_Reference_Data      dd  ?                   ; Reference data from real mode
DDB_Service_Table_Ptr   dd  0                   ; Pointer to service table
DDB_Service_Table_Size  dd  0                   ; Number of services
VxD_Desc_Block ENDS