/* mbavar.h 4.15 81/04/08 */
* This file contains definitions related to the kernel structures
* for dealing with the massbus adapters.
* Each mba has a mba_hd structure.
* Each massbus device has a mba_device structure.
* Each massbus slave has a mba_slave structure.
* At boot time we prowl the structures and fill in the pointers
* for devices which we find.
* The initialization routine uses the information in the mbdinit table
* to initialize the what is attached to each massbus slot information.
* It counts the number of devices on each mba (to see if bothering to
* search/seek is appropriate).
* During normal operation, the devices attached to the mba which wish
* to transfer are queued on the mh_act? links.
short mh_active
; /* set if mba is active */
short mh_ndrive
; /* number of devices, to avoid seeks */
struct mba_regs
*mh_mba
; /* virt addr of mba */
struct mba_regs
*mh_physmba
; /* phys addr of mba */
struct mba_device
*mh_mbip
[8]; /* what is attached to each dev */
struct mba_device
*mh_actf
; /* head of queue to transfer */
struct mba_device
*mh_actl
; /* tail of queue to transfer */
* (one for each RM/RP disk, and one for each tape formatter).
* This structure is used by the device driver as its argument
* to the massbus driver, and by the massbus driver to locate
* the device driver for a particular massbus slot.
* The device drivers hang ready buffers on this structure,
* and the massbus driver will start i/o on the first such buffer
struct mba_driver
*mi_driver
;
short mi_unit
; /* unit number to the system */
short mi_mbanum
; /* the mba it is on */
short mi_drive
; /* controller on mba */
short mi_dk
; /* driver number for iostat */
short mi_alive
; /* device exists */
short mi_type
; /* driver specific unit type */
struct buf mi_tab
; /* head of queue for this device */
struct mba_device
*mi_forw
;
/* we could compute these every time, but hereby save time */
* Tape formatter slaves are specified by
* the following information which is used
* at boot time to initialize the tape driver
struct mba_driver
*ms_driver
;
short ms_ctlr
; /* which of several formatters */
short ms_unit
; /* which unit to system */
short ms_slave
; /* which slave to formatter */
* Per device-type structure.
* Each massbus driver defines entries for a set of routines used
* by the massbus driver, as well as an array of types which are
int (*md_attach
)(); /* attach a device */
int (*md_slave
)(); /* attach a slave */
int (*md_ustart
)(); /* unit start routine */
int (*md_start
)(); /* setup a data transfer */
int (*md_dtint
)(); /* data transfer complete */
int (*md_ndint
)(); /* non-data transfer interrupt */
short *md_type
; /* array of drive type codes */
char *md_dname
, *md_sname
; /* device, slave names */
struct mba_device
**md_info
; /* backpointers to mbinit structs */
* Possible return values from unit start routines.
#define MBU_NEXT 0 /* skip to next operation */
#define MBU_BUSY 1 /* dual port busy; wait for intr */
#define MBU_STARTED 2 /* non-data transfer started */
#define MBU_DODATA 3 /* data transfer ready; start mba */
* Possible return values from data transfer interrupt handling routines
#define MBD_DONE 0 /* data transfer complete */
#define MBD_RETRY 1 /* error occurred, please retry */
#define MBD_RESTARTED 2 /* driver restarted i/o itself */
* Possible return values from non-data-transfer interrupt handling routines
#define MBN_DONE 0 /* non-data transfer complete */
#define MBN_RETRY 1 /* failed; retry the operation */
#define MBN_SKIP 2 /* don't do anything */
* Clear attention status for specified device.
#define mbclrattn(mi) ((mi)->mi_mba->mba_drv[0].mbd_as = 1 << (mi)->mi_drive)
* Kernel definitions related to mba.
struct mba_hd mba_hd
[NMBA
];
extern Xmba0int(), Xmba1int(), Xmba2int(), Xmba3int();
extern struct mba_device mbdinit
[];
extern struct mba_slave mbsinit
[];