2 * Copyright (c) 2006 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #include <sys/types.h>
36 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #include <sys/malloc.h>
39 #include <sys/systimer.h>
40 #include <sys/sysctl.h>
41 #include <sys/signal.h>
42 #include <sys/interrupt.h>
45 #include <sys/event.h>
46 #include <machine/cpu.h>
47 #include <machine/globaldata.h>
48 #include <machine/md_var.h>
56 void (*func)(void *, struct intrframe *);
61 static int KQueueFd = -1;
64 * Initialize kqueue based I/O
66 * Use SIGIO to get an immediate event when the kqueue has something waiting
67 * for us. Setup the SIGIO signal as a mailbox signal for efficiency.
69 * Currently only read events are supported.
76 bzero(&sa, sizeof(sa));
77 /*sa.sa_mailbox = &mdcpu->gd_mailbox;*/
79 sa.sa_handler = kqueuesig;
80 sigemptyset(&sa.sa_mask);
81 sigaction(SIGIO, &sa, NULL);
84 if (fcntl(KQueueFd, F_SETOWN, getpid()) < 0)
85 panic("Cannot configure kqueue for SIGIO, update your kernel");
86 if (fcntl(KQueueFd, F_SETFL, O_ASYNC) < 0)
87 panic("Cannot configure kqueue for SIGIO, update your kernel");
92 * Signal handler dispatches interrupt thread. Use interrupt #1
103 * Generic I/O event support
106 kqueue_add(int fd, void (*func)(void *, struct intrframe *), void *data)
108 struct timespec ts = { 0, 0 };
109 struct kqueue_info *info;
112 info = kmalloc(sizeof(*info), M_DEVBUF, M_ZERO|M_INTWAIT);
116 EV_SET(&kev, fd, EVFILT_READ, EV_ADD|EV_ENABLE|EV_CLEAR, 0, 0, info);
117 if (kevent(KQueueFd, &kev, 1, NULL, 0, &ts) < 0)
118 panic("kqueue: kevent() call could not add descriptor");
124 * Medium resolution timer support
127 kqueue_add_timer(void (*func)(void *, struct intrframe *), void *data)
129 struct kqueue_info *info;
131 info = kmalloc(sizeof(*info), M_DEVBUF, M_ZERO|M_INTWAIT);
134 info->fd = (uintptr_t)info;
140 kqueue_reload_timer(struct kqueue_info *info, int ms)
142 struct timespec ts = { 0, 0 };
147 EV_SET(&kev, info->fd, EVFILT_TIMER,
148 EV_ADD|EV_ENABLE|EV_ONESHOT|EV_CLEAR, 0, (uintptr_t)ms, info);
149 if (kevent(KQueueFd, &kev, 1, NULL, 0, &ts) < 0)
150 panic("kqueue_reload_timer: Failed");
155 * Destroy a previously added kqueue event
158 kqueue_del(struct kqueue_info *info)
160 struct timespec ts = { 0, 0 };
163 KKASSERT(info->fd >= 0);
164 EV_SET(&kev, info->fd, EVFILT_READ, EV_DELETE, 0, 0, NULL);
165 if (kevent(KQueueFd, &kev, 1, NULL, 0, &ts) < 0)
166 panic("kevent: failed to delete descriptor %d", info->fd);
168 kfree(info, M_DEVBUF);
172 * Safely called via DragonFly's normal interrupt handling mechanism.
174 * Calleld with the MP lock held. Note that this is still an interrupt
178 kqueue_intr(struct intrframe *frame)
181 struct kevent kevary[8];
188 n = kevent(KQueueFd, NULL, 0, kevary, 8, &ts);
189 for (i = 0; i < n; ++i) {
190 struct kevent *kev = &kevary[i];
191 struct kqueue_info *info = (void *)kev->udata;
193 info->func(info->data, frame);