Compaq EN Series Technical Reference Manual page 168

To support Windows NT an additional table to the BIOS32 table has been defined to contain 32-
bit pointers for the DDC and SIT locations. The Windows NT extension table is as follows:
; Extension to BIOS SERVICE directory table (next paragraph)
db "32OS"
db 2
db "$DDC"
dd ?
dw ?
db "$SIT"
dd ?
dw ?
db "$ERB"
dd ?
dw ?
The service identifier for Desktop Management functions is "$CLM." Once the service identifier
is found and the checksum verified, a FAR call is invoked using the value specified at offset 04h
to retrieve the CM services entry point. The following entry conditions are used for calling the
Desktop Management service directory:
INPUT:
EAX
EBX (31..8)
EBX (7..0)
CS
DS
SS
(I/O permissions must be provided so that the BIOS can support as necessary)
OUTPUT:
AL
EBX
ECX
EDX
The following subsections describe aspects of Desktop Management unique to this system. For a
general description of these BIOS functions refer to the Compaq BIOS Technical Reference
Guide.
; sig
; number of entries in table
; DDC POST buffer sig
; 32-bit pointer
; byte size
; SIT sig
; 32-bit pointer
; byte size
; ESCD sig
; 32-bit pointer
; bytes size
= Service Identifier [$CLM]
= Reserved
= Must be set to 00h
= Code selector set to encompass the physical page holding
entry point as well as the immediately following physical page.
It must have the same base. CS is execute/read.
= Data selector set to encompass the physical page holding
entry point as well as the immediately following physical page.
It must have the same base. DS is read only.
= Stack selector must provide at least 1K of stack space and be 32-bit.
= Return code:
00h, requested service is present
80h, requested service is not present
81h, un-implemented function specified in BL
86h and CF=1, function not supported
= Physical address to use as the selector BASE for the service
= Value to use as the selector LIMIT for the service
= Entry point for the service relative to the BASE returned in EBX
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition - September 1998
Technical Reference Guide
8-5