The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/kprintf.h

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    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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