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1.1 root 1: /* if_imp.h 6.1 83/07/29 */
2:
3: /*
4: * Structure of IMP 1822 long leader.
5: */
6: struct control_leader {
7: u_char dl_format; /* leader format */
8: u_char dl_network; /* src/dest network */
9: u_char dl_flags; /* leader flags */
10: u_char dl_mtype; /* message type */
11: u_char dl_htype; /* handling type */
12: u_char dl_host; /* host number */
13: u_short dl_imp; /* imp field */
14: u_char dl_link; /* link number */
15: u_char dl_subtype; /* message subtype */
16: };
17:
18: struct imp_leader {
19: struct control_leader il_dl;
20: #define il_format il_dl.dl_format
21: #define il_network il_dl.dl_network
22: #define il_flags il_dl.dl_flags
23: #define il_mtype il_dl.dl_mtype
24: #define il_htype il_dl.dl_htype
25: #define il_host il_dl.dl_host
26: #define il_imp il_dl.dl_imp
27: #define il_link il_dl.dl_link
28: #define il_subtype il_dl.dl_subtype
29: u_short il_length; /* message length */
30: };
31:
32: #define IMP_DROPCNT 2 /* # of noops from imp to ignore */
33: /* insure things are even... */
34: #define IMPMTU ((8159 / NBBY) & ~01)
35:
36: /*
37: * IMP-host flags
38: */
39: #define IMP_NFF 0xf /* 96-bit (new) format */
40: #define IMP_TRACE 0x8 /* trace message route */
41:
42: #define IMP_DMASK 0x3 /* host going down mask */
43:
44: /*
45: * IMP-host message types.
46: */
47: #define IMPTYPE_DATA 0 /* data for protocol */
48: #define IMPTYPE_BADLEADER 1 /* leader error */
49: #define IMPTYPE_DOWN 2 /* imp going down */
50: #define IMPTYPE_NOOP 4 /* noop seen during initialization */
51: #define IMPTYPE_RFNM 5 /* request for new messages */
52: #define IMPTYPE_HOSTDEAD 6 /* host doesn't respond */
53: #define IMPTYPE_HOSTUNREACH 7 /* host unreachable */
54: #define IMPTYPE_BADDATA 8 /* data error */
55: #define IMPTYPE_INCOMPLETE 9 /* incomplete message, send rest */
56: #define IMPTYPE_RESET 10 /* reset complete */
57: /* non-blocking IMP interface */
58: #define IMPTYPE_RETRY 11 /* IMP refused, try again */
59: #define IMPTYPE_NOTIFY 12 /* IMP refused, will notify */
60: #define IMPTYPE_TRYING 13 /* IMP refused, still rexmt'ng */
61: #define IMPTYPE_READY 14 /* ready for next message */
62:
63: /*
64: * IMPTYPE_DOWN subtypes.
65: */
66: #define IMPDOWN_GOING 0 /* 30 secs */
67: #define IMPDOWN_PM 1 /* hardware PM */
68: #define IMPDOWN_RELOAD 2 /* software reload */
69: #define IMPDOWN_RESTART 3 /* emergency restart */
70:
71: /*
72: * IMPTYPE_BADLEADER subtypes.
73: */
74: #define IMPLEADER_ERR 0 /* error flip-flop set */
75: #define IMPLEADER_SHORT 1 /* leader < 80 bits */
76: #define IMPLEADER_TYPE 2 /* illegal type field */
77: #define IMPLEADER_OPPOSITE 3 /* opposite leader type */
78:
79: /*
80: * IMPTYPE_HOSTDEAD subtypes.
81: */
82: #define IMPHOST_NORDY 1 /* ready-line negated */
83: #define IMPHOST_TARDY 2 /* tardy receiving mesgs */
84: #define IMPHOST_NOEXIST 3 /* NCC doesn't know host */
85: #define IMPHOST_IMPSOFT 4 /* IMP software won't allow mesgs */
86: #define IMPHOST_PM 5 /* host down for scheduled PM */
87: #define IMPHOST_HARDSCHED 6 /* " " " " hardware work */
88: #define IMPHOST_SOFTSCHED 7 /* " " " " software work */
89: #define IMPHOST_RESTART 8 /* host down for emergency restart */
90: #define IMPHOST_POWER 9 /* down because of power outage */
91: #define IMPHOST_BREAKPOINT 10 /* host stopped at a breakpoint */
92: #define IMPHOST_HARDWARE 11 /* hardware failure */
93: #define IMPHOST_NOTUP 12 /* host not scheduled to be up */
94: /* 13-14 currently unused */
95: #define IMPHOST_COMINGUP 15 /* host in process of coming up */
96:
97: /*
98: * IMPTYPE_HOSTUNREACH subtypes.
99: */
100: #define IMPREACH_IMP 0 /* destination IMP can't be reached */
101: #define IMPREACH_HOSTUP 1 /* destination host isn't up */
102: #define IMPREACH_LEADER 2 /* host doesn't support long leader */
103: #define IMPREACH_PROHIBITED 3 /* communication is prohibited */
104:
105: /*
106: * IMPTYPE_INCOMPLETE subtypes.
107: */
108: #define IMPCOMPLETE_SLOW 0 /* host didn't take data fast enough */
109: #define IMPCOMPLETE_TOOLONG 1 /* message was too long */
110: #define IMPCOMPLETE_TIMEOUT 2 /* mesg transmission time > 15 sec. */
111: #define IMPCOMPLETE_FAILURE 3 /* IMP/circuit failure */
112: #define IMPCOMPLETE_NOSPACE 4 /* no resources within 15 sec. */
113: #define IMPCOMPLETE_IMPIO 5 /* src IMP I/O failure during receipt */
114:
115: /*
116: * IMPTYPE_RETRY subtypes.
117: */
118: #define IMPRETRY_BUFFER 0 /* IMP buffer wasn't available */
119: #define IMPRETRY_BLOCK 1 /* connection block unavailable */
120:
121: /*
122: * Data structure shared between IMP protocol module and hardware
123: * interface driver. Used to allow layering of IMP routines on top
124: * of varying device drivers. NOTE: there's a possible problem
125: * with ambiguity in the ``unit'' definition which is implicitly
126: * shared by the both IMP and device code. If we have two IMPs,
127: * with each on top of a device of the same unit, things won't work.
128: * The assumption is if you've got multiple IMPs, then they all run
129: * on top of the same type of device, or they must have different units.
130: */
131: struct impcb {
132: char ic_oactive; /* output in progress */
133: int (*ic_init)(); /* hardware init routine */
134: int (*ic_start)(); /* hardware start output routine */
135: };
136:
137: /*
138: * State of an IMP.
139: */
140: #define IMPS_DOWN 0 /* unavailable, don't use */
141: #define IMPS_GOINGDOWN 1 /* been told we go down soon */
142: #define IMPS_INIT 2 /* coming up */
143: #define IMPS_UP 3 /* ready to go */
144: #define IMPS_RESET 4 /* reset in progress */
145:
146: #define IMPTV_DOWN (30*60) /* going down timer 30 secs */
147:
148: #ifdef IMPLEADERS
149: char *impleaders[IMPTYPE_READY+1] = {
150: "DATA", "BADLEADER", "DOWN", "bad", "NOOP", "RFNM", "HOSTDEAD",
151: "HOSTUNREACH", "BADDATA", "INCOMPLETE", "RESET", "RETRY",
152: "NOTIFY", "TRYING", "READY"
153: };
154: #endif
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