1/*
2 * Copyright (c) 1997, Stefan Esser <se@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/net/netisr.c 103781 2002-09-22 05:56:41Z jake $
27 */
28
29#include <sys/param.h>
30#include <sys/systm.h>
31#include <sys/bus.h>
32#include <sys/proc.h>
33#include <sys/interrupt.h>
34#include <sys/kernel.h>
35
36#include <net/netisr.h>
37
38static void swi_net(void *);
39
40void *net_ih;
41volatile unsigned int netisr;
42void (*netisrs[32])(void);
43
44void
45legacy_setsoftnet(void)
46{
47 swi_sched(net_ih, 0);
48}
49
50int
51register_netisr(int num, netisr_t *handler)
52{
53
54 if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) {
55 printf("register_netisr: bad isr number: %d\n", num);
56 return (EINVAL);
57 }
58 netisrs[num] = handler;
59 return (0);
60}
61
62int
63unregister_netisr(int num)
64{
65
66 if (num < 0 || num >= (sizeof(netisrs)/sizeof(*netisrs)) ) {
67 printf("unregister_netisr: bad isr number: %d\n", num);
68 return (EINVAL);
69 }
70 netisrs[num] = NULL;
71 return (0);
72}
73
74#ifdef DEVICE_POLLING
75void netisr_pollmore(void);
76#endif
77
78static void
79swi_net(void *dummy)
80{
81 u_int bits;
82 int i;
83
84#ifdef DEVICE_POLLING
85 for (;;) {
86 int pollmore;
87#endif
88 bits = atomic_readandclear_int(&netisr);
89#ifdef DEVICE_POLLING
90 if (bits == 0)
91 return;
92 pollmore = bits & (1 << NETISR_POLL);
93#endif
94 while ((i = ffs(bits)) != 0) {
95 i--;
96 if (netisrs[i] != NULL)
97 netisrs[i]();
98 else
99 printf("swi_net: unregistered isr number: %d.\n", i);
100 bits &= ~(1 << i);
101 }
102#ifdef DEVICE_POLLING
103 if (pollmore)
104 netisr_pollmore();
105 }
106#endif
107}
108
109static void
110start_netisr(void *dummy)
111{
112
113 if (swi_add(NULL, "net", swi_net, NULL, SWI_NET, 0, &net_ih))
114 panic("start_netisr");
115}
116SYSINIT(start_netisr, SI_SUB_SOFTINTR, SI_ORDER_FIRST, start_netisr, NULL)