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/10.3/sys/i386/include/vmparam.h 282065 2015-04-27 08:02:12Z kib $
   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  * Choose between DENSE and SPARSE based on whether lower execution time or
   68  * lower kernel address space consumption is desired.  Under PAE, kernel
   69  * address space is often in short supply.
   70  */
   71 #ifdef PAE
   72 #define VM_PHYSSEG_SPARSE
   73 #else
   74 #define VM_PHYSSEG_DENSE
   75 #endif
   76 
   77 /*
   78  * The number of PHYSSEG entries must be one greater than the number
   79  * of phys_avail entries because the phys_avail entry that spans the
   80  * largest physical address that is accessible by ISA DMA is split
   81  * into two PHYSSEG entries. 
   82  */
   83 #define VM_PHYSSEG_MAX          17
   84 
   85 /*
   86  * Create two free page pools.  Since the i386 kernel virtual address
   87  * space does not include a mapping onto the machine's entire physical
   88  * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default
   89  * pool, VM_FREEPOOL_DEFAULT.
   90  */
   91 #define VM_NFREEPOOL            2
   92 #define VM_FREEPOOL_CACHE       1
   93 #define VM_FREEPOOL_DEFAULT     0
   94 #define VM_FREEPOOL_DIRECT      0
   95 
   96 /*
   97  * Create two free page lists: VM_FREELIST_DEFAULT is for physical
   98  * pages that are above the largest physical address that is
   99  * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
  100  * that are below that address.
  101  */
  102 #define VM_NFREELIST            2
  103 #define VM_FREELIST_DEFAULT     0
  104 #define VM_FREELIST_ISADMA      1
  105 
  106 /*
  107  * The largest allocation size is 2MB under PAE and 4MB otherwise.
  108  */
  109 #ifdef PAE
  110 #define VM_NFREEORDER           10
  111 #else
  112 #define VM_NFREEORDER           11
  113 #endif
  114 
  115 /*
  116  * Enable superpage reservations: 1 level.
  117  */
  118 #ifndef VM_NRESERVLEVEL
  119 #define VM_NRESERVLEVEL         1
  120 #endif
  121 
  122 /*
  123  * Level 0 reservations consist of 512 pages when PAE pagetables are
  124  * used, and 1024 pages otherwise.
  125  */
  126 #ifndef VM_LEVEL_0_ORDER
  127 #if defined(PAE) || defined(PAE_TABLES)
  128 #define VM_LEVEL_0_ORDER        9
  129 #else
  130 #define VM_LEVEL_0_ORDER        10
  131 #endif
  132 #endif
  133 
  134 /*
  135  * Kernel physical load address.
  136  */
  137 #ifndef KERNLOAD
  138 #if defined(XEN) && !defined(XEN_PRIVILEGED_GUEST)
  139 #define KERNLOAD                0
  140 #else
  141 #define KERNLOAD                (1 << PDRSHIFT)
  142 #endif
  143 #endif /* !defined(KERNLOAD) */
  144 
  145 /*
  146  * Virtual addresses of things.  Derived from the page directory and
  147  * page table indexes from pmap.h for precision.
  148  * Because of the page that is both a PD and PT, it looks a little
  149  * messy at times, but hey, we'll do anything to save a page :-)
  150  */
  151 
  152 #ifdef XEN
  153 #define VM_MAX_KERNEL_ADDRESS   HYPERVISOR_VIRT_START
  154 #else
  155 #define VM_MAX_KERNEL_ADDRESS   VADDR(KPTDI+NKPDE-1, NPTEPG-1)
  156 #endif
  157 
  158 #define VM_MIN_KERNEL_ADDRESS   VADDR(PTDPTDI, PTDPTDI)
  159 
  160 #define KERNBASE                VADDR(KPTDI, 0)
  161 
  162 #define UPT_MAX_ADDRESS         VADDR(PTDPTDI, PTDPTDI)
  163 #define UPT_MIN_ADDRESS         VADDR(PTDPTDI, 0)
  164 
  165 #define VM_MAXUSER_ADDRESS      VADDR(PTDPTDI, 0)
  166 
  167 #define SHAREDPAGE              (VM_MAXUSER_ADDRESS - PAGE_SIZE)
  168 #define USRSTACK                SHAREDPAGE
  169 
  170 #define VM_MAX_ADDRESS          VADDR(PTDPTDI, PTDPTDI)
  171 #define VM_MIN_ADDRESS          ((vm_offset_t)0)
  172 
  173 /*
  174  * How many physical pages per kmem arena virtual page.
  175  */
  176 #ifndef VM_KMEM_SIZE_SCALE
  177 #define VM_KMEM_SIZE_SCALE      (3)
  178 #endif
  179 
  180 /*
  181  * Optional floor (in bytes) on the size of the kmem arena.
  182  */
  183 #ifndef VM_KMEM_SIZE_MIN
  184 #define VM_KMEM_SIZE_MIN        (12 * 1024 * 1024)
  185 #endif
  186 
  187 /*
  188  * Optional ceiling (in bytes) on the size of the kmem arena: 40% of the
  189  * kernel map rounded to the nearest multiple of the superpage size.
  190  */
  191 #ifndef VM_KMEM_SIZE_MAX
  192 #define VM_KMEM_SIZE_MAX        (((((VM_MAX_KERNEL_ADDRESS - \
  193     VM_MIN_KERNEL_ADDRESS) >> (PDRSHIFT - 2)) + 5) / 10) << PDRSHIFT)
  194 #endif
  195 
  196 /* initial pagein size of beginning of executable file */
  197 #ifndef VM_INITIAL_PAGEIN
  198 #define VM_INITIAL_PAGEIN       16
  199 #endif
  200 
  201 #define ZERO_REGION_SIZE        (64 * 1024)     /* 64KB */
  202 
  203 #ifndef VM_MAX_AUTOTUNE_MAXUSERS
  204 #define VM_MAX_AUTOTUNE_MAXUSERS 384
  205 #endif
  206 
  207 #endif /* _MACHINE_VMPARAM_H_ */

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