/* udareg.h 4.1 81/11/04 */
* UDA-50 registers and structures
short udaip
; /* initialization and polling */
short udasa
; /* status and address */
#define UDA_ERR 0100000 /* error bit */
#define UDA_STEP4 0040000 /* step 4 has started */
#define UDA_STEP3 0020000 /* step 3 has started */
#define UDA_STEP2 0010000 /* step 2 has started */
#define UDA_STEP1 0004000 /* step 1 has started */
#define UDA_NV 0002000 /* no host settable interrupt vector */
#define UDA_QB 0001000 /* controller supports Q22 bus */
#define UDA_DI 0000400 /* controller implements diagnostics */
#define UDA_IE 0000200 /* interrupt enable */
#define UDA_PI 0000001 /* host requests adapter purge interrupts */
#define UDA_GO 0000001 /* start operation, after init */
* UDA Communications Area
short ca_xxx1
; /* unused */
char ca_xxx2
; /* unused */
char ca_bdp
; /* BDP to purge */
short ca_cmdint
; /* command queue transition interrupt flag */
short ca_rspint
; /* response queue transition interrupt flag */
long ca_rspdsc
[NRSP
];/* response descriptors */
long ca_cmddsc
[NCMD
];/* command descriptors */
#define ca_ringbase ca_rspdsc[0]
#define UDA_OWN 0x80000000 /* UDA owns this descriptor */
#define UDA_INT 0x40000000 /* allow interrupt on ring transition */
short uda_msglen
; /* length of MSCP packet */
char uda_credits
; /* low 4 bits: credits, high 4 bits: msgtype */
char uda_vcid
; /* virtual circuit id */