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/8.3/sys/i386/include/vmparam.h 199583 2009-11-20 15:27:52Z jhb $
   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 /*
   47  * Virtual memory related constants, all in bytes
   48  */
   49 #define MAXTSIZ         (128UL*1024*1024)       /* max text size */
   50 #ifndef DFLDSIZ
   51 #define DFLDSIZ         (128UL*1024*1024)       /* initial data size limit */
   52 #endif
   53 #ifndef MAXDSIZ
   54 #define MAXDSIZ         (512UL*1024*1024)       /* max data size */
   55 #endif
   56 #ifndef DFLSSIZ
   57 #define DFLSSIZ         (8UL*1024*1024)         /* initial stack size limit */
   58 #endif
   59 #ifndef MAXSSIZ
   60 #define MAXSSIZ         (64UL*1024*1024)        /* max stack size */
   61 #endif
   62 #ifndef SGROWSIZ
   63 #define SGROWSIZ        (128UL*1024)            /* amount to grow stack */
   64 #endif
   65 
   66 /*
   67  * The time for a process to be blocked before being very swappable.
   68  * This is a number of seconds which the system takes as being a non-trivial
   69  * amount of real time.  You probably shouldn't change this;
   70  * it is used in subtle ways (fractions and multiples of it are, that is, like
   71  * half of a ``long time'', almost a long time, etc.)
   72  * It is related to human patience and other factors which don't really
   73  * change over time.
   74  */
   75 #define MAXSLP          20
   76 
   77 
   78 /*
   79  * The physical address space is densely populated.
   80  */
   81 #define VM_PHYSSEG_DENSE
   82 
   83 /*
   84  * The number of PHYSSEG entries must be one greater than the number
   85  * of phys_avail entries because the phys_avail entry that spans the
   86  * largest physical address that is accessible by ISA DMA is split
   87  * into two PHYSSEG entries. 
   88  */
   89 #define VM_PHYSSEG_MAX          17
   90 
   91 /*
   92  * Create two free page pools.  Since the i386 kernel virtual address
   93  * space does not include a mapping onto the machine's entire physical
   94  * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default
   95  * pool, VM_FREEPOOL_DEFAULT.
   96  */
   97 #define VM_NFREEPOOL            2
   98 #define VM_FREEPOOL_CACHE       1
   99 #define VM_FREEPOOL_DEFAULT     0
  100 #define VM_FREEPOOL_DIRECT      0
  101 
  102 /*
  103  * Create two free page lists: VM_FREELIST_DEFAULT is for physical
  104  * pages that are above the largest physical address that is
  105  * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
  106  * that are below that address.
  107  */
  108 #define VM_NFREELIST            2
  109 #define VM_FREELIST_DEFAULT     0
  110 #define VM_FREELIST_ISADMA      1
  111 
  112 /*
  113  * The largest allocation size is 2MB under PAE and 4MB otherwise.
  114  */
  115 #ifdef PAE
  116 #define VM_NFREEORDER           10
  117 #else
  118 #define VM_NFREEORDER           11
  119 #endif
  120 
  121 /*
  122  * Enable superpage reservations: 1 level.
  123  */
  124 #ifndef VM_NRESERVLEVEL
  125 #define VM_NRESERVLEVEL         1
  126 #endif
  127 
  128 /*
  129  * Level 0 reservations consist of 512 pages under PAE and 1024 pages
  130  * otherwise.
  131  */
  132 #ifndef VM_LEVEL_0_ORDER
  133 #ifdef PAE
  134 #define VM_LEVEL_0_ORDER        9
  135 #else
  136 #define VM_LEVEL_0_ORDER        10
  137 #endif
  138 #endif
  139 
  140 /*
  141  * Kernel physical load address.
  142  */
  143 #ifndef KERNLOAD
  144 #if defined(XEN) && !defined(XEN_PRIVILEGED_GUEST)
  145 #define KERNLOAD                0
  146 #else
  147 #define KERNLOAD                (1 << PDRSHIFT)
  148 #endif
  149 #endif /* !defined(KERNLOAD) */
  150 
  151 /*
  152  * Virtual addresses of things.  Derived from the page directory and
  153  * page table indexes from pmap.h for precision.
  154  * Because of the page that is both a PD and PT, it looks a little
  155  * messy at times, but hey, we'll do anything to save a page :-)
  156  */
  157 
  158 #ifdef XEN
  159 #define VM_MAX_KERNEL_ADDRESS   HYPERVISOR_VIRT_START
  160 #else
  161 #define VM_MAX_KERNEL_ADDRESS   VADDR(KPTDI+NKPDE-1, NPTEPG-1)
  162 #endif
  163 
  164 #define VM_MIN_KERNEL_ADDRESS   VADDR(PTDPTDI, PTDPTDI)
  165 
  166 #define KERNBASE                VADDR(KPTDI, 0)
  167 
  168 #define UPT_MAX_ADDRESS         VADDR(PTDPTDI, PTDPTDI)
  169 #define UPT_MIN_ADDRESS         VADDR(PTDPTDI, 0)
  170 
  171 #define VM_MAXUSER_ADDRESS      VADDR(PTDPTDI, 0)
  172 
  173 #define USRSTACK                VM_MAXUSER_ADDRESS
  174 
  175 #define VM_MAX_ADDRESS          VADDR(PTDPTDI, PTDPTDI)
  176 #define VM_MIN_ADDRESS          ((vm_offset_t)0)
  177 
  178 /* virtual sizes (bytes) for various kernel submaps */
  179 #ifndef VM_KMEM_SIZE
  180 #define VM_KMEM_SIZE            (12 * 1024 * 1024)
  181 #endif
  182 
  183 /*
  184  * How many physical pages per KVA page allocated.
  185  * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE),
  186  *     VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX)
  187  * is the total KVA space allocated for kmem_map.
  188  */
  189 #ifndef VM_KMEM_SIZE_SCALE
  190 #define VM_KMEM_SIZE_SCALE      (3)
  191 #endif
  192 
  193 /*
  194  * Ceiling on amount of kmem_map kva space.
  195  */
  196 #ifndef VM_KMEM_SIZE_MAX
  197 #define VM_KMEM_SIZE_MAX        (320 * 1024 * 1024)
  198 #endif
  199 
  200 /* initial pagein size of beginning of executable file */
  201 #ifndef VM_INITIAL_PAGEIN
  202 #define VM_INITIAL_PAGEIN       16
  203 #endif
  204 
  205 #endif /* _MACHINE_VMPARAM_H_ */

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