Specifications

Device Driver Entry Points

Unit Delivery Routine

For controllers that can control a variable number of device units, determines

which speciﬁc devices are present and available for inclusion in the system’s

conﬁguration.

Speciﬁed in

Specify the name of the unit delivery routine in the deliver argument to the

DPTAB macro. The macro puts the relative address of this routine in DPT$W_

DELIVER.

Called by

The System Generation utility (SYSGEN) command AUTOCONFIGURE calls the

unit delivery routine once for each unit the controller is capable of controlling.

This value is speciﬁed in the defunits argument to the DPTAB macro.

Synchronization

The unit delivery routine is called at IPL$_POWER. It must not lower IPL.

Context

The unit delivery routine executes in the context of the process within which

SYSGEN executes.

The unit delivery routine can use R0, R1, and R2 freely, but must preserve the

contents of all other registers.

Input

Location Contents

R3 Address of IDB; 0 if none exists

R4 Address of device’s CSR

R5 Number of unit that the unit delivery routine must

decide to conﬁgure or not to conﬁgure

R6 Address of start of the UNIBUS adapter’s or

Q22–bus’s I/O space (UNIBUS or Q22–bus devices);

address of MBA conﬁguration register (MASSBUS

devices)

R7 Address of AUTOCONFIGURE command’s

conﬁguration control block (ACF)

R8 Address of ADP

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