Desktop Management Support; Table 8-1. Desktop Management - Compaq EN Series Technical Reference Manual

Chapter 8 BIOS ROM
8.4

DESKTOP MANAGEMENT SUPPORT

Desktop Management deals with issues of security, identification, and system management
functions. Desktop Management is provided by BIOS INT 15 functions listed Table 8-1.
Table 8–1. Desktop Management Functions (INT15)
Desktop Management Functions (INT15)
AX
E800h
E807h
E813h
E814h
E816h
E817h
E818h
E819h
E81Ah
E81Bh
E81Eh
E820h
E822h
E827h
E828h
E845h
E846h
All 32-bit protected mode calls are accessed by using the industry-standard BIOS32 Service
Directory. Using the service directory involves three steps:
1. Locating the service directory.
2. Using the service directory to obtain the entry point for the client management functions.
3. Calling the client management service to perform the desired function.
The BIOS32 Service Directory is a 16-byte block that begins on a 16-byte boundary between the
physical address range of 0E0000h-0FFFFFh. The format is as follows:
Offset
00h
04h
08h
09h
0Ah
0Bh
8-4 Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Table 8-1.
Function
Get system ID
Get System Information Table
Get monitor information
Get system revision
Get temperature status
Get drive attribute
Get drive off-line test
Get chassis serial number
Write chassis serial number
Get drive threshold
Get drive ID
System Memory Map
Flash ROM/Sys. Admin. Fnc.
DIMM EEPROM Access
Inhibit power button
Access CMOS Feature Bits
Security Functions
No. Bytes Description
4 Service identifier (four ASCII characters)
4 Entry point for the BIOS32 Service Directory
1 Revision level
1 Length of data structure (no. of 16-byte units)
1 Checksum (should add up to 00h)
5 Reserved (all 0s)
Third Edition - September 1998
Mode
Real, 16-, & 32-bit Prot.
Real, 16-, & 32-bit Prot.
Real, 16-, & 32-bit Prot.
Real, 16-, & 32-bit Prot.
Real, 16-, & 32-bit Prot.
Real
Real
Real, 16-, & 32-bit Prot.
Real
Real
Real
Real
Real, 16-, & 32-bit Prot.
Real, 16-, & 32-bit Prot.
Real, 16-, & 32-bit Prot.
Real, 16-, & 32-bit Prot.
Real, 16-, & 32-bit Prot.