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  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      from: @(#)vmparam.h     5.9 (Berkeley) 5/12/91
   35  * $FreeBSD: releng/6.2/sys/i386/include/vmparam.h 133827 2004-08-16 08:35:22Z obrien $
   36  */
   37 
   38 
   39 #ifndef _MACHINE_VMPARAM_H_
   40 #define _MACHINE_VMPARAM_H_ 1
   41 
   42 /*
   43  * Machine dependent constants for 386.
   44  */
   45 
   46 #define VM_PROT_READ_IS_EXEC    /* if you can read -- then you can exec */
   47 
   48 /*
   49  * Virtual memory related constants, all in bytes
   50  */
   51 #define MAXTSIZ         (128UL*1024*1024)       /* max text size */
   52 #ifndef DFLDSIZ
   53 #define DFLDSIZ         (128UL*1024*1024)       /* initial data size limit */
   54 #endif
   55 #ifndef MAXDSIZ
   56 #define MAXDSIZ         (512UL*1024*1024)       /* max data size */
   57 #endif
   58 #ifndef DFLSSIZ
   59 #define DFLSSIZ         (8UL*1024*1024)         /* initial stack size limit */
   60 #endif
   61 #ifndef MAXSSIZ
   62 #define MAXSSIZ         (64UL*1024*1024)        /* max stack size */
   63 #endif
   64 #ifndef SGROWSIZ
   65 #define SGROWSIZ        (128UL*1024)            /* amount to grow stack */
   66 #endif
   67 
   68 #define USRTEXT         (1*PAGE_SIZE)           /* base of user text XXX bogus */
   69 
   70 /*
   71  * The time for a process to be blocked before being very swappable.
   72  * This is a number of seconds which the system takes as being a non-trivial
   73  * amount of real time.  You probably shouldn't change this;
   74  * it is used in subtle ways (fractions and multiples of it are, that is, like
   75  * half of a ``long time'', almost a long time, etc.)
   76  * It is related to human patience and other factors which don't really
   77  * change over time.
   78  */
   79 #define MAXSLP          20
   80 
   81 
   82 /*
   83  * Kernel physical load address.
   84  */
   85 #ifndef KERNLOAD
   86 #define KERNLOAD                (1 << PDRSHIFT)
   87 #endif
   88 
   89 /*
   90  * Virtual addresses of things.  Derived from the page directory and
   91  * page table indexes from pmap.h for precision.
   92  * Because of the page that is both a PD and PT, it looks a little
   93  * messy at times, but hey, we'll do anything to save a page :-)
   94  */
   95 
   96 #define VM_MAX_KERNEL_ADDRESS   VADDR(KPTDI+NKPDE-1, NPTEPG-1)
   97 #define VM_MIN_KERNEL_ADDRESS   VADDR(PTDPTDI, PTDPTDI)
   98 
   99 #define KERNBASE                VADDR(KPTDI, 0)
  100 
  101 #define UPT_MAX_ADDRESS         VADDR(PTDPTDI, PTDPTDI)
  102 #define UPT_MIN_ADDRESS         VADDR(PTDPTDI, 0)
  103 
  104 #define VM_MAXUSER_ADDRESS      VADDR(PTDPTDI, 0)
  105 
  106 #define USRSTACK                VM_MAXUSER_ADDRESS
  107 
  108 #define VM_MAX_ADDRESS          VADDR(PTDPTDI, PTDPTDI)
  109 #define VM_MIN_ADDRESS          ((vm_offset_t)0)
  110 
  111 /* virtual sizes (bytes) for various kernel submaps */
  112 #ifndef VM_KMEM_SIZE
  113 #define VM_KMEM_SIZE            (12 * 1024 * 1024)
  114 #endif
  115 
  116 /*
  117  * How many physical pages per KVA page allocated.
  118  * min(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), VM_KMEM_SIZE_MAX)
  119  * is the total KVA space allocated for kmem_map.
  120  */
  121 #ifndef VM_KMEM_SIZE_SCALE
  122 #define VM_KMEM_SIZE_SCALE      (3)
  123 #endif
  124 
  125 /*
  126  * Ceiling on amount of kmem_map kva space.
  127  */
  128 #ifndef VM_KMEM_SIZE_MAX
  129 #define VM_KMEM_SIZE_MAX        (320 * 1024 * 1024)
  130 #endif
  131 
  132 /* initial pagein size of beginning of executable file */
  133 #ifndef VM_INITIAL_PAGEIN
  134 #define VM_INITIAL_PAGEIN       16
  135 #endif
  136 
  137 #endif /* _MACHINE_VMPARAM_H_ */

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