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/i386/include/vmparam.h

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    1 /*-
    2  * Copyright (c) 1990 The Regents of the University of California.
    3  * All rights reserved.
    4  * Copyright (c) 1994 John S. Dyson
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * William Jolitz.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the University of
   21  *      California, Berkeley and its contributors.
   22  * 4. Neither the name of the University nor the names of its contributors
   23  *    may be used to endorse or promote products derived from this software
   24  *    without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  *
   38  *      from: @(#)vmparam.h     5.9 (Berkeley) 5/12/91
   39  * $FreeBSD: stable/3/sys/i386/include/vmparam.h 50582 1999-08-29 16:07:53Z peter $
   40  */
   41 
   42 
   43 #ifndef _MACHINE_VMPARAM_H_
   44 #define _MACHINE_VMPARAM_H_ 1
   45 
   46 /*
   47  * Machine dependent constants for 386.
   48  */
   49 
   50 #define VM_PROT_READ_IS_EXEC    /* if you can read -- then you can exec */
   51 
   52 /*
   53  * Virtual memory related constants, all in bytes
   54  */
   55 #define MAXTSIZ         (128UL*1024*1024)       /* max text size */
   56 #ifndef DFLDSIZ
   57 #define DFLDSIZ         (128UL*1024*1024)       /* initial data size limit */
   58 #endif
   59 #ifndef MAXDSIZ
   60 #define MAXDSIZ         (512UL*1024*1024)       /* max data size */
   61 #endif
   62 #ifndef DFLSSIZ
   63 #define DFLSSIZ         (8UL*1024*1024)         /* initial stack size limit */
   64 #endif
   65 #ifndef MAXSSIZ
   66 #define MAXSSIZ         (64UL*1024*1024)        /* max stack size */
   67 #endif
   68 #ifndef SGROWSIZ
   69 #define SGROWSIZ        (128UL*1024)            /* amount to grow stack */
   70 #endif
   71 
   72 #define USRTEXT         (1*PAGE_SIZE)           /* base of user text XXX bogus */
   73 
   74 /*
   75  * Size of the Shared Memory Pages page table.
   76  */
   77 #ifndef SHMMAXPGS
   78 #define SHMMAXPGS       1024            /* XXX until we have more kmap space */
   79 #endif
   80 
   81 /*
   82  * The time for a process to be blocked before being very swappable.
   83  * This is a number of seconds which the system takes as being a non-trivial
   84  * amount of real time.  You probably shouldn't change this;
   85  * it is used in subtle ways (fractions and multiples of it are, that is, like
   86  * half of a ``long time'', almost a long time, etc.)
   87  * It is related to human patience and other factors which don't really
   88  * change over time.
   89  */
   90 #define MAXSLP          20
   91 
   92 
   93 /*
   94  * Virtual addresses of things.  Derived from the page directory and
   95  * page table indexes from pmap.h for precision.
   96  * Because of the page that is both a PD and PT, it looks a little
   97  * messy at times, but hey, we'll do anything to save a page :-)
   98  */
   99 
  100 #define VM_MAX_KERNEL_ADDRESS   VADDR(KPTDI+NKPDE, 0)
  101 #define VM_MIN_KERNEL_ADDRESS   VADDR(PTDPTDI, PTDPTDI)
  102 
  103 #define KERNBASE                VADDR(KPTDI, 0)
  104 
  105 #define KPT_MAX_ADDRESS         VADDR(PTDPTDI, KPTDI+NKPT)
  106 #define KPT_MIN_ADDRESS         VADDR(PTDPTDI, KPTDI)
  107 
  108 #define UPT_MAX_ADDRESS         VADDR(PTDPTDI, PTDPTDI)
  109 #define UPT_MIN_ADDRESS         VADDR(PTDPTDI, 0)
  110 
  111 #define VM_MAXUSER_ADDRESS      VADDR(UMAXPTDI, UMAXPTEOFF)
  112 
  113 #define USRSTACK                VM_MAXUSER_ADDRESS
  114 
  115 #define VM_MAX_ADDRESS          VADDR(PTDPTDI, PTDPTDI)
  116 #define VM_MIN_ADDRESS          ((vm_offset_t)0)
  117 
  118 /* virtual sizes (bytes) for various kernel submaps */
  119 #ifndef VM_KMEM_SIZE
  120 #define VM_KMEM_SIZE            (12 * 1024 * 1024)
  121 #endif
  122 
  123 /*
  124  * How many physical pages per KVA page allocated.
  125  * min(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), VM_KMEM_SIZE_MAX)
  126  * is the total KVA space allocated for kmem_map.
  127  */
  128 #ifndef VM_KMEM_SIZE_SCALE
  129 #define VM_KMEM_SIZE_SCALE      (3)
  130 #endif
  131 
  132 /*
  133  * Ceiling on amount of kmem_map kva space.
  134  */
  135 #ifndef VM_KMEM_SIZE_MAX
  136 #define VM_KMEM_SIZE_MAX        (200 * 1024 * 1024)
  137 #endif
  138 
  139 /* initial pagein size of beginning of executable file */
  140 #ifndef VM_INITIAL_PAGEIN
  141 #define VM_INITIAL_PAGEIN       16
  142 #endif
  143 
  144 #endif /* _MACHINE_VMPARAM_H_ */

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