FreeBSD/Linux Kernel Cross Reference
sys/sys/kprintf.h
1 /* $NetBSD: kprintf.h,v 1.4 2003/08/07 16:34:06 agc Exp $ */
2
3 /*-
4 * Copyright (c) 1986, 1988, 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37 #ifndef _SYS_KPRINTF_H_
38 #define _SYS_KPRINTF_H_
39
40 #include "opt_multiprocessor.h"
41 #include <sys/lock.h>
42
43 /*
44 * Implementation internals of the kernel printf. Exposing them here
45 * allows other subsystems to implement precisely the printf semantics
46 * they need.
47 */
48
49 #if defined(MULTIPROCESSOR)
50
51 extern struct simplelock kprintf_slock;
52
53 /*
54 * Use cpu_simple_lock() and cpu_simple_unlock(). These are the actual
55 * atomic locking operations, and never attempt to print debugging
56 * information.
57 */
58 #define KPRINTF_MUTEX_ENTER(s) \
59 do { \
60 (s) = splhigh(); \
61 __cpu_simple_lock(&kprintf_slock.lock_data); \
62 } while (/*CONSTCOND*/0)
63
64 #define KPRINTF_MUTEX_EXIT(s) \
65 do { \
66 __cpu_simple_unlock(&kprintf_slock.lock_data); \
67 splx((s)); \
68 } while (/*CONSTCOND*/0)
69
70 #else
71
72 #define KPRINTF_MUTEX_ENTER(s) (s) = splhigh()
73 #define KPRINTF_MUTEX_EXIT(s) splx((s))
74
75 #endif /* MULTIPROCESSOR */
76
77 /* flags for kprintf */
78 #define TOCONS 0x0001 /* to the console */
79 #define TOTTY 0x0002 /* to the process' tty */
80 #define TOLOG 0x0004 /* to the kernel message buffer */
81 #define TOBUFONLY 0x0008 /* to the buffer (only) [for snprintf] */
82 #define TODDB 0x0010 /* to ddb console */
83 #define NOLOCK 0x1000 /* don't acquire a tty lock */
84
85 /*
86 * NOTE: the kprintf mutex must be held when these functions are called!
87 */
88 int kprintf __P((const char *, int, void *, char *, _BSD_VA_LIST_));
89 void klogpri __P((int));
90
91 #endif /* _SYS_KPRINTF_H_ */
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