1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
/* $OpenBSD: softintr.c,v 1.4 2009/04/19 17:50:18 oga Exp $ */
/* $NetBSD: softintr.c,v 1.1 2003/02/26 21:26:12 fvdl Exp $ */
/*-
* Copyright (c) 2000, 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Generic soft interrupt implementation for NetBSD/x86.
*/
#include <sys/param.h>
#include <sys/malloc.h>
#include <machine/intr.h>
#include <uvm/uvm_extern.h>
struct x86_soft_intr x86_soft_intrs[X86_NSOFTINTR];
const int x86_soft_intr_to_ssir[X86_NSOFTINTR] = {
SIR_CLOCK,
SIR_NET,
SIR_TTY,
};
/*
* softintr_init:
*
* Initialize the software interrupt system.
*/
void
softintr_init(void)
{
struct x86_soft_intr *si;
int i;
for (i = 0; i < X86_NSOFTINTR; i++) {
si = &x86_soft_intrs[i];
TAILQ_INIT(&si->softintr_q);
mtx_init(&si->softintr_lock, IPL_HIGH);
si->softintr_ssir = x86_soft_intr_to_ssir[i];
}
}
/*
* softintr_dispatch:
*
* Process pending software interrupts.
*/
void
softintr_dispatch(int which)
{
struct x86_soft_intr *si = &x86_soft_intrs[which];
struct x86_soft_intrhand *sih;
for (;;) {
mtx_enter(&si->softintr_lock);
sih = TAILQ_FIRST(&si->softintr_q);
if (sih == NULL) {
mtx_leave(&si->softintr_lock);
break;
}
TAILQ_REMOVE(&si->softintr_q, sih, sih_q);
sih->sih_pending = 0;
mtx_leave(&si->softintr_lock);
uvmexp.softs++;
(*sih->sih_fn)(sih->sih_arg);
}
}
/*
* softintr_establish: [interface]
*
* Register a software interrupt handler.
*/
void *
softintr_establish(int ipl, void (*func)(void *), void *arg)
{
struct x86_soft_intr *si;
struct x86_soft_intrhand *sih;
int which;
switch (ipl) {
case IPL_SOFTCLOCK:
which = X86_SOFTINTR_SOFTCLOCK;
break;
case IPL_SOFTNET:
which = X86_SOFTINTR_SOFTNET;
break;
case IPL_TTY:
case IPL_SOFTTTY:
which = X86_SOFTINTR_SOFTTTY;
break;
default:
panic("softintr_establish");
}
si = &x86_soft_intrs[which];
sih = malloc(sizeof(*sih), M_DEVBUF, M_NOWAIT);
if (__predict_true(sih != NULL)) {
sih->sih_intrhead = si;
sih->sih_fn = func;
sih->sih_arg = arg;
sih->sih_pending = 0;
}
return (sih);
}
/*
* softintr_disestablish: [interface]
*
* Unregister a software interrupt handler.
*/
void
softintr_disestablish(void *arg)
{
struct x86_soft_intrhand *sih = arg;
struct x86_soft_intr *si = sih->sih_intrhead;
mtx_enter(&si->softintr_lock);
if (sih->sih_pending) {
TAILQ_REMOVE(&si->softintr_q, sih, sih_q);
sih->sih_pending = 0;
}
mtx_leave(&si->softintr_lock);
free(sih, M_DEVBUF);
}
|
