HP Vectra Technical Reference Manual page 113

Table 4.13
V_S8259 Function Code Summary
Vector
Func. Function
Address Value Equate Definition
001EH
V_S8259
8259 interrupt controller support
001EH 02
F_SYSTEM
System functions
001EH 02/00
SF_INIT Initialize HP slave 8259A
001EH
02/02
SF_START Enable HP slave 8259A interrupts
001EH 02/06
SF_VERSION_DESC Report HP version number
001EH 04
F_IO_CONTROL Entry point to I/O control functions
001EH 04/00
SF_ENABLE_SVC Unmask svc/8041 interrupt
001EH 04/02
SF-DISABLE_SVC Mask svc/8041 interrupt
001EH 04/04
SF_ENABLE_KBD
Unmask keyboard INT 9 interrupt
001EH
04/06
SF_DISABLE_KBD Mask keyboard INT 9 interrupt
001EH
04/08
SF_ENABLE_HPHIL Unmask HP-HIL interrupt
001EH
04/0A
SF_DISABLE_HPHIL Mask HP-HIL interrupt
F_ISR (AH
=
OOH)
Because this driver directly services hardware interrupts from an 8259A interrupt controller, this
function is not applicable. If called, this function will return a Return Status Code of
RS_UNSUPPORTED.
SF_INIT (AX
=
0200H)
This subfunction sets the interrupt vectors for the three HP 8259A slave interrupt sources to the
appropriate entry points in the driver. In addition, the necessary 8259A parameters are
programmed into the HP 8259A slave interrupt controller. This subfunction leaves interrupts
disabled. They must be enabled with the SF_START subfunction.
On Entry: AH
=
F_SYSTEM (02H)
AL
=
SF_INIT (DOH)
BP
=
V_S8259 (001 EH)
On Exit: AH
=
Return Status Code
Registers Altered: AX, BP, DS
104 Input System and HP-HIL