Annotation of sys/arch/luna88k/luna88k/isr.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: isr.c,v 1.6 2005/12/12 19:15:19 miod Exp $ */
2: /* $NetBSD: isr.c,v 1.5 2000/07/09 08:08:20 nisimura Exp $ */
3:
4: /*-
5: * Copyright (c) 1996 The NetBSD Foundation, Inc.
6: * All rights reserved.
7: *
8: * This code is derived from software contributed to The NetBSD Foundation
9: * by Adam Glass, Gordon W. Ross, and Jason R. Thorpe.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: * 3. All advertising materials mentioning features or use of this software
20: * must display the following acknowledgement:
21: * This product includes software developed by the NetBSD
22: * Foundation, Inc. and its contributors.
23: * 4. Neither the name of The NetBSD Foundation nor the names of its
24: * contributors may be used to endorse or promote products derived
25: * from this software without specific prior written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37: * POSSIBILITY OF SUCH DAMAGE.
38: */
39:
40: /*
41: * Link and dispatch interrupts.
42: */
43:
44: #include <sys/param.h>
45: #include <sys/systm.h>
46: #include <sys/malloc.h>
47: #include <sys/vmmeter.h>
48: #include <sys/evcount.h>
49:
50: #include <uvm/uvm_extern.h>
51:
52: #include <net/netisr.h>
53:
54: #include <machine/cpu.h>
55:
56: #include <luna88k/luna88k/isr.h>
57:
58: isr_autovec_list_t isr_autovec[NISRAUTOVEC];
59:
60: void
61: isrinit()
62: {
63: int i;
64:
65: /* Initialize the autovector lists. */
66: for (i = 0; i < NISRAUTOVEC; ++i) {
67: LIST_INIT(&isr_autovec[i]);
68: }
69: }
70:
71: /*
72: * Establish an autovectored interrupt handler.
73: * Called by driver attach functions.
74: */
75: void
76: isrlink_autovec(int (*func)(void *), void *arg, int ipl, int priority,
77: const char *name)
78: {
79: struct isr_autovec *newisr, *curisr;
80: isr_autovec_list_t *list;
81:
82: #ifdef DIAGNOSTIC
83: if (ipl < 0 || ipl >= NISRAUTOVEC)
84: panic("isrlink_autovec: bad ipl %d", ipl);
85: #endif
86:
87: newisr = (struct isr_autovec *)malloc(sizeof(struct isr_autovec),
88: M_DEVBUF, M_NOWAIT);
89: if (newisr == NULL)
90: panic("isrlink_autovec: can't allocate space for isr");
91:
92: /* Fill in the new entry. */
93: newisr->isr_func = func;
94: newisr->isr_arg = arg;
95: newisr->isr_ipl = ipl;
96: newisr->isr_priority = priority;
97: evcount_attach(&newisr->isr_count, name, (void *)&newisr->isr_ipl,
98: &evcount_intr);
99:
100: /*
101: * Some devices are particularly sensitive to interrupt
102: * handling latency. The SCC, for example, can lose many
103: * characters if its interrupt isn't handled with reasonable
104: * speed.
105: *
106: * To work around this problem, each device can give itself a
107: * "priority". An unbuffered SCC would give itself a higher
108: * priority than a SCSI device, for example.
109: *
110: * This solution was originally developed for the hp300, which
111: * has a flat spl scheme (by necessity). Thankfully, the
112: * MVME systems don't have this problem, though this may serve
113: * a useful purpose in any case.
114: */
115:
116: /*
117: * Get the appropriate ISR list. If the list is empty, no
118: * additional work is necessary; we simply insert ourselves
119: * at the head of the list.
120: */
121: list = &isr_autovec[ipl];
122: if (LIST_EMPTY(list)) {
123: LIST_INSERT_HEAD(list, newisr, isr_link);
124: return;
125: }
126:
127: /*
128: * A little extra work is required. We traverse the list
129: * and place ourselves after any ISRs with our current (or
130: * higher) priority.
131: */
132: for (curisr = LIST_FIRST(list); LIST_NEXT(curisr, isr_link) != NULL;
133: curisr = LIST_NEXT(curisr, isr_link)) {
134: if (newisr->isr_priority > curisr->isr_priority) {
135: LIST_INSERT_BEFORE(curisr, newisr, isr_link);
136: return;
137: }
138: }
139:
140: /*
141: * We're the least important entry, it seems. We just go
142: * on the end.
143: */
144: LIST_INSERT_AFTER(curisr, newisr, isr_link);
145: }
146:
147: /*
148: * This is the dispatcher called by the low-level
149: * assembly language autovectored interrupt routine.
150: */
151: void
152: isrdispatch_autovec(int ipl)
153: {
154: struct isr_autovec *isr;
155: isr_autovec_list_t *list;
156: int rc, handled = 0;
157: static int straycount, unexpected;
158:
159: #ifdef DIAGNOSTIC
160: if (ipl < 0 || ipl >= NISRAUTOVEC)
161: panic("isrdispatch_autovec: bad ipl 0x%d", ipl);
162: #endif
163:
164: #if 0 /* XXX: already counted in machdep.c */
165: uvmexp.intrs++;
166: #endif
167:
168: list = &isr_autovec[ipl];
169: if (LIST_EMPTY(list)) {
170: printf("isrdispatch_autovec: ipl %d unexpected\n", ipl);
171: if (++unexpected > 10)
172: panic("too many unexpected interrupts");
173: return;
174: }
175:
176: /* Give all the handlers a chance. */
177: LIST_FOREACH(isr, list, isr_link) {
178: rc = (*isr->isr_func)(isr->isr_arg);
179: if (rc != 0)
180: isr->isr_count.ec_count++;
181: handled |= rc;
182: }
183:
184: if (handled)
185: straycount = 0;
186: else if (++straycount > 50)
187: panic("isr_dispatch_autovec: too many stray interrupts");
188: else
189: printf("isrdispatch_autovec: stray level %d interrupt\n", ipl);
190: }
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