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1.1 root 1: /*
2: * Copyright (c) 1982, 1986 Regents of the University of California.
3: * All rights reserved. The Berkeley software License Agreement
4: * specifies the terms and conditions for redistribution.
5: *
6: * @(#)if_imp.h 7.1 (Berkeley) 6/4/86
7: */
8:
9: /*
10: * Structure of IMP 1822 long leader.
11: */
12: struct control_leader {
13: u_char dl_format; /* leader format */
14: u_char dl_network; /* src/dest network */
15: u_char dl_flags; /* leader flags */
16: u_char dl_mtype; /* message type */
17: u_char dl_htype; /* handling type */
18: u_char dl_host; /* host number */
19: u_short dl_imp; /* imp field */
20: u_char dl_link; /* link number */
21: u_char dl_subtype; /* message subtype */
22: };
23:
24: struct imp_leader {
25: struct control_leader il_dl;
26: #define il_format il_dl.dl_format
27: #define il_network il_dl.dl_network
28: #define il_flags il_dl.dl_flags
29: #define il_mtype il_dl.dl_mtype
30: #define il_htype il_dl.dl_htype
31: #define il_host il_dl.dl_host
32: #define il_imp il_dl.dl_imp
33: #define il_link il_dl.dl_link
34: #define il_subtype il_dl.dl_subtype
35: u_short il_length; /* message length */
36: };
37:
38: #define IMP_DROPCNT 2 /* # of noops from imp to ignore */
39: /* insure things are even... */
40: #define IMPMTU ((8159 / NBBY) & ~01)
41:
42: /*
43: * IMP-host flags
44: */
45: #define IMP_NFF 0xf /* 96-bit (new) format */
46: #define IMP_TRACE 0x8 /* trace message route */
47:
48: #define IMP_DMASK 0x3 /* host going down mask */
49:
50: /*
51: * IMP-host message types.
52: */
53: #define IMPTYPE_DATA 0 /* data for protocol */
54: #define IMPTYPE_BADLEADER 1 /* leader error */
55: #define IMPTYPE_DOWN 2 /* imp going down */
56: #define IMPTYPE_NOOP 4 /* noop seen during initialization */
57: #define IMPTYPE_RFNM 5 /* request for new messages */
58: #define IMPTYPE_HOSTDEAD 6 /* host doesn't respond */
59: #define IMPTYPE_HOSTUNREACH 7 /* host unreachable */
60: #define IMPTYPE_BADDATA 8 /* data error */
61: #define IMPTYPE_INCOMPLETE 9 /* incomplete message, send rest */
62: #define IMPTYPE_RESET 10 /* reset complete */
63: /* non-blocking IMP interface */
64: #define IMPTYPE_RETRY 11 /* IMP refused, try again */
65: #define IMPTYPE_NOTIFY 12 /* IMP refused, will notify */
66: #define IMPTYPE_TRYING 13 /* IMP refused, still rexmt'ng */
67: #define IMPTYPE_READY 14 /* ready for next message */
68:
69: /*
70: * IMPTYPE_DOWN subtypes.
71: */
72: #define IMPDOWN_GOING 0 /* 30 secs */
73: #define IMPDOWN_PM 1 /* hardware PM */
74: #define IMPDOWN_RELOAD 2 /* software reload */
75: #define IMPDOWN_RESTART 3 /* emergency restart */
76:
77: /*
78: * IMPTYPE_BADLEADER subtypes.
79: */
80: #define IMPLEADER_ERR 0 /* error flip-flop set */
81: #define IMPLEADER_SHORT 1 /* leader < 80 bits */
82: #define IMPLEADER_TYPE 2 /* illegal type field */
83: #define IMPLEADER_OPPOSITE 3 /* opposite leader type */
84:
85: /*
86: * IMPTYPE_HOSTDEAD subtypes.
87: */
88: #define IMPHOST_NORDY 1 /* ready-line negated */
89: #define IMPHOST_TARDY 2 /* tardy receiving mesgs */
90: #define IMPHOST_NOEXIST 3 /* NCC doesn't know host */
91: #define IMPHOST_IMPSOFT 4 /* IMP software won't allow mesgs */
92: #define IMPHOST_PM 5 /* host down for scheduled PM */
93: #define IMPHOST_HARDSCHED 6 /* " " " " hardware work */
94: #define IMPHOST_SOFTSCHED 7 /* " " " " software work */
95: #define IMPHOST_RESTART 8 /* host down for emergency restart */
96: #define IMPHOST_POWER 9 /* down because of power outage */
97: #define IMPHOST_BREAKPOINT 10 /* host stopped at a breakpoint */
98: #define IMPHOST_HARDWARE 11 /* hardware failure */
99: #define IMPHOST_NOTUP 12 /* host not scheduled to be up */
100: /* 13-14 currently unused */
101: #define IMPHOST_COMINGUP 15 /* host in process of coming up */
102:
103: /*
104: * IMPTYPE_HOSTUNREACH subtypes.
105: */
106: #define IMPREACH_IMP 0 /* destination IMP can't be reached */
107: #define IMPREACH_HOSTUP 1 /* destination host isn't up */
108: #define IMPREACH_LEADER 2 /* host doesn't support long leader */
109: #define IMPREACH_PROHIBITED 3 /* communication is prohibited */
110:
111: /*
112: * IMPTYPE_INCOMPLETE subtypes.
113: */
114: #define IMPCOMPLETE_SLOW 0 /* host didn't take data fast enough */
115: #define IMPCOMPLETE_TOOLONG 1 /* message was too long */
116: #define IMPCOMPLETE_TIMEOUT 2 /* mesg transmission time > 15 sec. */
117: #define IMPCOMPLETE_FAILURE 3 /* IMP/circuit failure */
118: #define IMPCOMPLETE_NOSPACE 4 /* no resources within 15 sec. */
119: #define IMPCOMPLETE_IMPIO 5 /* src IMP I/O failure during receipt */
120:
121: /*
122: * IMPTYPE_RETRY subtypes.
123: */
124: #define IMPRETRY_BUFFER 0 /* IMP buffer wasn't available */
125: #define IMPRETRY_BLOCK 1 /* connection block unavailable */
126:
127: /*
128: * Data structure shared between IMP protocol module and hardware
129: * interface driver. Used to allow layering of IMP routines on top
130: * of varying device drivers. NOTE: there's a possible problem
131: * with ambiguity in the ``unit'' definition which is implicitly
132: * shared by the both IMP and device code. If we have two IMPs,
133: * with each on top of a device of the same unit, things won't work.
134: * The assumption is if you've got multiple IMPs, then they all run
135: * on top of the same type of device, or they must have different units.
136: */
137: struct impcb {
138: char ic_oactive; /* output in progress */
139: int (*ic_init)(); /* hardware init routine */
140: int (*ic_start)(); /* hardware start output routine */
141: };
142:
143: /*
144: * State of an IMP.
145: */
146: #define IMPS_DOWN 0 /* unavailable, don't use */
147: #define IMPS_GOINGDOWN 1 /* been told we go down soon */
148: #define IMPS_INIT 2 /* coming up */
149: #define IMPS_UP 3 /* ready to go */
150: #define IMPS_RESET 4 /* reset in progress */
151:
152: #define IMPTV_DOWN (30*60) /* going down timer 30 secs */
153:
154: #ifdef IMPLEADERS
155: char *impleaders[IMPTYPE_READY+1] = {
156: "DATA", "BADLEADER", "DOWN", "bad", "NOOP", "RFNM", "HOSTDEAD",
157: "HOSTUNREACH", "BADDATA", "INCOMPLETE", "RESET", "RETRY",
158: "NOTIFY", "TRYING", "READY"
159: };
160: #endif
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