FreeBSD/Linux Kernel Cross Reference
sys/i386/include/vmparam.h

     /*-
      * Copyright (c) 1990 The Regents of the University of California.
      * All rights reserved.
      * Copyright (c) 1994 John S. Dyson
      * All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * William Jolitz.
      *
     * 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. 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.
     *
     *      from: @(#)vmparam.h     5.9 (Berkeley) 5/12/91
     * $FreeBSD: src/sys/i386/include/vmparam.h,v 1.21.2.4 1999/09/05 08:12:12 peter Exp $
     */
    
    
    #ifndef _MACHINE_VMPARAM_H_
    #define _MACHINE_VMPARAM_H_ 1
    
    /*
     * Machine dependent constants for 386.
     */
    
    /*
     * Virtual memory related constants, all in bytes
     */
    #define MAXTSIZ         (128UL*1024*1024)       /* max text size */
    #ifndef DFLDSIZ
    #define DFLDSIZ         (256UL*1024*1024)       /* initial data size limit */
    #endif
    #ifndef MAXDSIZ
    #define MAXDSIZ         (512UL*1024*1024)       /* max data size */
    #endif
    #ifndef DFLSSIZ
    #define DFLSSIZ         (8UL*1024*1024)         /* initial stack size limit */
    #endif
    #ifndef MAXSSIZ
    #define MAXSSIZ         (64UL*1024*1024)        /* max stack size */
    #endif
    #ifndef SGROWSIZ
    #define SGROWSIZ        (128UL*1024)            /* amount to grow stack */
    #endif
    
    #define USRTEXT         (1*PAGE_SIZE)           /* base of user text XXX bogus */
    
    /*
     * Size of the Shared Memory Pages page table.
     */
    #ifndef SHMMAXPGS
    #define SHMMAXPGS       1024            /* XXX until we have more kmap space */
    #endif
    
    /*
     * The time for a process to be blocked before being very swappable.
     * This is a number of seconds which the system takes as being a non-trivial
     * amount of real time.  You probably shouldn't change this;
     * it is used in subtle ways (fractions and multiples of it are, that is, like
     * half of a ``long time'', almost a long time, etc.)
     * It is related to human patience and other factors which don't really
     * change over time.
     */
    #define MAXSLP          20
    
    
    /*
     * Virtual addresses of things.  Derived from the page directory and
     * page table indexes from pmap.h for precision.
     * Because of the page that is both a PD and PT, it looks a little
     * messy at times, but hey, we'll do anything to save a page :-)
     */
    
    #define VM_MAX_KERNEL_ADDRESS   VADDR(KPTDI+NKPDE, 0)
    #define VM_MIN_KERNEL_ADDRESS   VADDR(PTDPTDI, PTDPTDI)
   
   #define KERNBASE                VADDR(KPTDI, 0)
   
   #define KPT_MAX_ADDRESS         VADDR(PTDPTDI, KPTDI+NKPT)
   #define KPT_MIN_ADDRESS         VADDR(PTDPTDI, KPTDI)
   
   #define UPT_MAX_ADDRESS         VADDR(PTDPTDI, PTDPTDI)
   #define UPT_MIN_ADDRESS         VADDR(PTDPTDI, 0)
   
   #define VM_MAXUSER_ADDRESS      VADDR(KSTKPTDI, KSTKPTEOFF)
   
   #define USRSTACK                VM_MAXUSER_ADDRESS
   
   #define VM_MAX_ADDRESS          VADDR(PTDPTDI, PTDPTDI)
   #define VM_MIN_ADDRESS          ((vm_offset_t)0)
   
   /* virtual sizes (bytes) for various kernel submaps */
   #define VM_KMEM_SIZE            (32 * 1024 * 1024)
   
   /* read and exec are the same thing */
   #define VM_PROT_READ_IS_EXEC
   
   #endif /* _MACHINE_VMPARAM_H_ */

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