Specifications

Data Structures

1.1 Conﬁguration Control Block (ACF)

The conﬁguration control block (ACF) is used by the System Generation utility

(SYSGEN) autoconﬁguration facility to describe the device it is adding to the

system. Device drivers can gain access to this data structure only if they have

speciﬁed a unit delivery routine in the DPT and only when that routine is

executing. Under certain conditions, the information stored in the ACF might be

useful to a unit delivery routine.

The ﬁelds described in the conﬁguration control block are illustrated in

Figure 1–2 and described in Table 1–1. An asterisk (*) indicates a read-only

ﬁeld in tables and ﬁgures.

Figure 1–2 Conﬁguration Control Block (ACF)

ACF$L_ADAPTER* 0

ACF$L_CONFIGREG* 4

ACF$W_AVECTOR*ACF$B_AUNIT*ACF$B_AFLAG* 8

ACF$L_CONTRLREG* 12

ACF$W_CVECTOR*ACF$W_CUNIT* 16

ACF$L_DEVNAME* 20

ACF$L_DRVNAME* 24

ACF$W_MAXUNITS*ACF$B_CNUMVEC*ACF$B_COMBO_VEC* 28

ACF$B_COMBO_CSR*ACF$B_NUMUNIT*Unused 32

ACF$L_DLVR_SCRH 36

*A read-only ﬁeld

1–3