HP Vectra Technical Reference Manual page 24

Table 2.2
EX-BIOS Defined Functions
Function
Register
Subfunction AH AL Definition
F_ISR
00 Responds to a logical Interrupt Service Request (ISR).
F_SYSTEM Executes one of several standard subfunctions.
SF_INIT 02 00 Starts the initialization of a driver.
SF_START 02 02 Completes the initialization process of the driver.
SF_REPORT_STATE 02 04 Reports the state of the driver.
SF_VERSION_DESC 02
06 Reports the revision number and datecode of the
driver.
SF_DEF--ATTR 02 08 Reports the default configuration of the driver.
SF_GET--ATTR
02 OA
Reports the current configuration of the driver.
SF_SET--ATTR 02 OC Overrides the current configuration of the driver.
SF_OPEN
02 OE Reserves the driver for exclusive access. Requests
any resources required by the driver.
SF_CLOSE 02 10 Releases the driver from exclusive access.
SF_TIMEOUT
02 12
Reports to the driver that a requested timeout has
occurred.
SF_INTERVAL 02 14 Reports to the driver that a requested 60 Hz interval
has expi red.
SF_TEST 02 16 Performs a hardware test.
F_IO_CONTROL Executes the following subfunctions and any driver
dependant subfunctions.
SF_LOCK 04 00 Reserves the sub-address device specified for
exclusive access.
SF_UNLOCK 04 02 Releases the sub-address specified from the
exclusive access.
F_PUT_BYTE
06 Writes a byte of data.
F_GET_BYTE
08 Reads a byte of data.
F_PUT_BUFFER
OA Writes a variable length buffer of data (supported
by character devices).
F_PUT_BLOCK
OA Writes a fixed length buffer of data (supported by
block devices).
F_GET_BUFFER
DC Reads a variable length buffer of data (supported by
character devices).
F_GET_BLOCK
DC
Reads a fixed length block of data (supported by
block devices).
F_PUT_WORD
DE
Writes a word of data.
F_GET_WORD
10
Reads a word of data.
ROM BIOS Overview 15