FreeBSD/Linux Kernel Cross Reference
sys/conf/param.c

     /*      $NetBSD: param.c,v 1.58 2008/07/12 11:50:07 gmcgarry Exp $      */
     
     /*
      * Copyright (c) 1980, 1986, 1989 Regents of the University of California.
      * All rights reserved.
      * (c) UNIX System Laboratories, Inc.
      * All or some portions of this file are derived from material licensed
      * to the University of California by American Telephone and Telegraph
      * Co. or Unix System Laboratories, Inc. and are reproduced herein with
     * the permission of UNIX System Laboratories, Inc.
     *
     * 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.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
     *
     *      @(#)param.c     7.20 (Berkeley) 6/27/91
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: param.c,v 1.58 2008/07/12 11:50:07 gmcgarry Exp $");
    
    #include "opt_hz.h"
    #include "opt_rtc_offset.h"
    #include "opt_sysv.h"
    #include "opt_sysvparam.h"
    #include "opt_nmbclusters.h"
    #include "opt_multiprocessor.h"
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/socket.h>
    #include <sys/socketvar.h>
    #include <sys/proc.h>
    #include <sys/vnode.h>
    #include <sys/file.h>
    #include <sys/callout.h>
    #include <sys/mbuf.h>
    #include <ufs/ufs/quota.h>
    #include <sys/kernel.h>
    #include <sys/utsname.h>
    #ifdef SYSVSHM
    #include <machine/vmparam.h>
    #include <sys/shm.h>
    #endif
    #ifdef SYSVSEM
    #include <sys/sem.h>
    #endif
    #ifdef SYSVMSG
    #include <sys/msg.h>
    #endif
    
    /*
     * PCC cannot handle the 80KB string literal.
     */
    #if !defined(__PCC__)
    #define CONFIG_FILE
    #include "config_file.h"
    #endif
    
    /*
     * System parameter formulae.
     *
     * This file is copied into each directory where we compile
     * the kernel; it should be modified there to suit local taste
     * if necessary.
     *
     * Compiled with -DHZ=xx -DRTC_OFFSET=x -DMAXUSERS=xx
     */
    
    #ifdef TIMEZONE
    #error TIMEZONE is an obsolete kernel option.
    #endif
    
    #ifdef DST
    #error DST is an obsolete kernel option.
    #endif
    
    #ifndef RTC_OFFSET
    #define RTC_OFFSET 0
   #endif
   
   #ifndef HZ
   #define HZ 100
   #endif
   
   #ifndef MAXFILES
   #define MAXFILES        (3 * (NPROC + MAXUSERS) + 80)
   #endif
   
   #ifndef MAXEXEC
   #define MAXEXEC         16
   #endif
   
   int     hz = HZ;
   int     tick = 1000000 / HZ;
   /* can adjust 240ms in 60s */
   int     tickadj = (240000 / (60 * HZ)) ? (240000 / (60 * HZ)) : 1;
   int     rtc_offset = RTC_OFFSET;
   int     maxproc = NPROC;
   int     desiredvnodes = NVNODE;
   u_int   maxfiles = MAXFILES;
   int     fscale = FSCALE;        /* kernel uses `FSCALE', user uses `fscale' */
   int     maxexec = MAXEXEC;      /* max number of concurrent exec() calls */
   
   #ifdef MULTIPROCESSOR
   u_int   maxcpus = MAXCPUS;
   size_t  coherency_unit = COHERENCY_UNIT;
   #else
   u_int   maxcpus = 1;
   size_t  coherency_unit = ALIGNBYTES + 1;
   #endif
   
   /*
    * Various mbuf-related parameters.  These can also be changed at run-time
    * with sysctl.
    */
   int     nmbclusters = NMBCLUSTERS;
   
   #ifndef MBLOWAT
   #define MBLOWAT         16
   #endif
   int     mblowat = MBLOWAT;
   
   #ifndef MCLLOWAT
   #define MCLLOWAT        8
   #endif
   int     mcllowat = MCLLOWAT;
   
   /*
    * Values in support of System V compatible shared memory.      XXX
    */
   #ifdef SYSVSHM
   #ifndef SHMMAX
   #define SHMMAX  SHMMAXPGS       /* shminit() performs a `*= PAGE_SIZE' */
   #endif
   #ifndef SHMMIN
   #define SHMMIN  1
   #endif
   #ifndef SHMMNI
   #define SHMMNI  128             /* <64k, see IPCID_TO_IX in ipc.h */
   #endif
   #ifndef SHMSEG
   #define SHMSEG  128
   #endif
   #define SHMALL  SHMMAXPGS
   
   struct  shminfo shminfo = {
           SHMMAX,
           SHMMIN,
           SHMMNI,
           SHMSEG,
           SHMALL
   };
   #endif
   
   /*
    * Values in support of System V compatible semaphores.
    */
   #ifdef SYSVSEM
   struct  seminfo seminfo = {
           SEMMAP,         /* # of entries in semaphore map */
           SEMMNI,         /* # of semaphore identifiers */
           SEMMNS,         /* # of semaphores in system */
           SEMMNU,         /* # of undo structures in system */
           SEMMSL,         /* max # of semaphores per id */
           SEMOPM,         /* max # of operations per semop call */
           SEMUME,         /* max # of undo entries per process */
           SEMUSZ,         /* size in bytes of undo structure */
           SEMVMX,         /* semaphore maximum value */
           SEMAEM          /* adjust on exit max value */
   };
   #endif
   
   /*
    * Values in support of System V compatible messages.
    */
   #ifdef SYSVMSG
   struct  msginfo msginfo = {
           MSGMAX,         /* max chars in a message */
           MSGMNI,         /* # of message queue identifiers */
           MSGMNB,         /* max chars in a queue */
           MSGTQL,         /* max messages in system */
           MSGSSZ,         /* size of a message segment */
                           /* (must be small power of 2 greater than 4) */
           MSGSEG          /* number of message segments */
   };
   #endif
   
   /*
    * Actual network mbuf sizes (read-only), for netstat.
    */
   const   int msize = MSIZE;
   const   int mclbytes = MCLBYTES;

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