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: stable/9/sys/i386/include/vmparam.h 254515 2013-08-19 09:49:51Z andre $
   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 physical address space is densely populated.
   68  */
   69 #define VM_PHYSSEG_DENSE
   70 
   71 /*
   72  * The number of PHYSSEG entries must be one greater than the number
   73  * of phys_avail entries because the phys_avail entry that spans the
   74  * largest physical address that is accessible by ISA DMA is split
   75  * into two PHYSSEG entries. 
   76  */
   77 #define VM_PHYSSEG_MAX          17
   78 
   79 /*
   80  * Create two free page pools.  Since the i386 kernel virtual address
   81  * space does not include a mapping onto the machine's entire physical
   82  * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default
   83  * pool, VM_FREEPOOL_DEFAULT.
   84  */
   85 #define VM_NFREEPOOL            2
   86 #define VM_FREEPOOL_CACHE       1
   87 #define VM_FREEPOOL_DEFAULT     0
   88 #define VM_FREEPOOL_DIRECT      0
   89 
   90 /*
   91  * Create two free page lists: VM_FREELIST_DEFAULT is for physical
   92  * pages that are above the largest physical address that is
   93  * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
   94  * that are below that address.
   95  */
   96 #define VM_NFREELIST            2
   97 #define VM_FREELIST_DEFAULT     0
   98 #define VM_FREELIST_ISADMA      1
   99 
  100 /*
  101  * The largest allocation size is 2MB under PAE and 4MB otherwise.
  102  */
  103 #ifdef PAE
  104 #define VM_NFREEORDER           10
  105 #else
  106 #define VM_NFREEORDER           11
  107 #endif
  108 
  109 /*
  110  * Only one memory domain.
  111  */
  112 #ifndef VM_NDOMAIN
  113 #define VM_NDOMAIN              1
  114 #endif
  115 
  116 /*
  117  * Enable superpage reservations: 1 level.
  118  */
  119 #ifndef VM_NRESERVLEVEL
  120 #define VM_NRESERVLEVEL         1
  121 #endif
  122 
  123 /*
  124  * Level 0 reservations consist of 512 pages under PAE and 1024 pages
  125  * otherwise.
  126  */
  127 #ifndef VM_LEVEL_0_ORDER
  128 #ifdef PAE
  129 #define VM_LEVEL_0_ORDER        9
  130 #else
  131 #define VM_LEVEL_0_ORDER        10
  132 #endif
  133 #endif
  134 
  135 /*
  136  * Kernel physical load address.
  137  */
  138 #ifndef KERNLOAD
  139 #if defined(XEN) && !defined(XEN_PRIVILEGED_GUEST)
  140 #define KERNLOAD                0
  141 #else
  142 #define KERNLOAD                (1 << PDRSHIFT)
  143 #endif
  144 #endif /* !defined(KERNLOAD) */
  145 
  146 /*
  147  * Virtual addresses of things.  Derived from the page directory and
  148  * page table indexes from pmap.h for precision.
  149  * Because of the page that is both a PD and PT, it looks a little
  150  * messy at times, but hey, we'll do anything to save a page :-)
  151  */
  152 
  153 #ifdef XEN
  154 #define VM_MAX_KERNEL_ADDRESS   HYPERVISOR_VIRT_START
  155 #else
  156 #define VM_MAX_KERNEL_ADDRESS   VADDR(KPTDI+NKPDE-1, NPTEPG-1)
  157 #endif
  158 
  159 #define VM_MIN_KERNEL_ADDRESS   VADDR(PTDPTDI, PTDPTDI)
  160 
  161 #define KERNBASE                VADDR(KPTDI, 0)
  162 
  163 #define UPT_MAX_ADDRESS         VADDR(PTDPTDI, PTDPTDI)
  164 #define UPT_MIN_ADDRESS         VADDR(PTDPTDI, 0)
  165 
  166 #define VM_MAXUSER_ADDRESS      VADDR(PTDPTDI, 0)
  167 
  168 #define SHAREDPAGE              (VM_MAXUSER_ADDRESS - PAGE_SIZE)
  169 #define USRSTACK                SHAREDPAGE
  170 
  171 #define VM_MAX_ADDRESS          VADDR(PTDPTDI, PTDPTDI)
  172 #define VM_MIN_ADDRESS          ((vm_offset_t)0)
  173 
  174 /* virtual sizes (bytes) for various kernel submaps */
  175 #ifndef VM_KMEM_SIZE
  176 #define VM_KMEM_SIZE            (12 * 1024 * 1024)
  177 #endif
  178 
  179 /*
  180  * How many physical pages per KVA page allocated.
  181  * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE),
  182  *     VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX)
  183  * is the total KVA space allocated for kmem_map.
  184  */
  185 #ifndef VM_KMEM_SIZE_SCALE
  186 #define VM_KMEM_SIZE_SCALE      (3)
  187 #endif
  188 
  189 /*
  190  * Ceiling on the amount of kmem_map KVA space: 40% of the entire KVA space
  191  * rounded to the nearest multiple of the superpage size.
  192  */
  193 #ifndef VM_KMEM_SIZE_MAX
  194 #define VM_KMEM_SIZE_MAX        (((((VM_MAX_KERNEL_ADDRESS - \
  195     VM_MIN_KERNEL_ADDRESS) >> (PDRSHIFT - 2)) + 5) / 10) << PDRSHIFT)
  196 #endif
  197 
  198 /* initial pagein size of beginning of executable file */
  199 #ifndef VM_INITIAL_PAGEIN
  200 #define VM_INITIAL_PAGEIN       16
  201 #endif
  202 
  203 #define ZERO_REGION_SIZE        (64 * 1024)     /* 64KB */
  204 
  205 #ifndef VM_MAX_AUTOTUNE_MAXUSERS
  206 #define VM_MAX_AUTOTUNE_MAXUSERS 384
  207 #endif
  208 
  209 #endif /* _MACHINE_VMPARAM_H_ */

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