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/mips/include/vmparam.h

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    1 /*      $OpenBSD: vmparam.h,v 1.2 1998/09/15 10:50:12 pefo Exp $        */
    2 /*      $NetBSD: vmparam.h,v 1.5 1994/10/26 21:10:10 cgd Exp $  */
    3 
    4 /*
    5  * Copyright (c) 1988 University of Utah.
    6  * Copyright (c) 1992, 1993
    7  *      The Regents of the University of California.  All rights reserved.
    8  *
    9  * This code is derived from software contributed to Berkeley by
   10  * the Systems Programming Group of the University of Utah Computer
   11  * Science Department and Ralph Campbell.
   12  *
   13  * Redistribution and use in source and binary forms, with or without
   14  * modification, are permitted provided that the following conditions
   15  * are met:
   16  * 1. Redistributions of source code must retain the above copyright
   17  *    notice, this list of conditions and the following disclaimer.
   18  * 2. Redistributions in binary form must reproduce the above copyright
   19  *    notice, this list of conditions and the following disclaimer in the
   20  *    documentation and/or other materials provided with the distribution.
   21  * 4. Neither the name of the University nor the names of its contributors
   22  *    may be used to endorse or promote products derived from this software
   23  *    without specific prior written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   35  * SUCH DAMAGE.
   36  *
   37  *      from: Utah Hdr: vmparam.h 1.16 91/01/18
   38  *      @(#)vmparam.h   8.2 (Berkeley) 4/22/94
   39  *      JNPR: vmparam.h,v 1.3.2.1 2007/09/10 06:01:28 girish
   40  * $FreeBSD: stable/8/sys/mips/include/vmparam.h 251455 2013-06-06 09:13:07Z smh $
   41  */
   42 
   43 #ifndef _MACHINE_VMPARAM_H_
   44 #define _MACHINE_VMPARAM_H_
   45 
   46 /*
   47  * Machine dependent constants mips processors.
   48  */
   49 /*
   50  * USRTEXT is the start of the user text/data space, while USRSTACK
   51  * is the top (end) of the user stack.
   52  */
   53 #define USRTEXT         (1*PAGE_SIZE)
   54 
   55 /*
   56  * Virtual memory related constants, all in bytes
   57  */
   58 #ifndef MAXTSIZ
   59 #define MAXTSIZ         (128UL*1024*1024)       /* max text size */
   60 #endif
   61 #ifndef DFLDSIZ
   62 #define DFLDSIZ         (128UL*1024*1024)       /* initial data size limit */
   63 #endif
   64 #ifndef MAXDSIZ
   65 #define MAXDSIZ         (1*1024UL*1024*1024)    /* max data size */
   66 #endif
   67 #ifndef DFLSSIZ
   68 #define DFLSSIZ         (8UL*1024*1024)         /* initial stack size limit */
   69 #endif
   70 #ifndef MAXSSIZ
   71 #define MAXSSIZ         (64UL*1024*1024)        /* max stack size */
   72 #endif
   73 #ifndef SGROWSIZ
   74 #define SGROWSIZ        (128UL*1024)            /* amount to grow stack */
   75 #endif
   76 
   77 /* 
   78  * The time for a process to be blocked before being very swappable.
   79  * This is a number of seconds which the system takes as being a non-trivial
   80  * amount of real time.  You probably shouldn't change this;
   81  * it is used in subtle ways (fractions and multiples of it are, that is, like
   82  * half of a ``long time'', almost a long time, etc.)
   83  * It is related to human patience and other factors which don't really
   84  * change over time.
   85  */
   86 #define MAXSLP          20
   87 
   88 /*
   89  * Mach derived constants
   90  */
   91 
   92 /* user/kernel map constants */
   93 #define VM_MIN_ADDRESS          ((vm_offset_t)0x00000000)
   94 #define VM_MAX_ADDRESS          ((vm_offset_t)(intptr_t)(int32_t)0xffffffff)
   95 
   96 #define VM_MINUSER_ADDRESS      ((vm_offset_t)0x00000000)
   97 #define VM_MAX_MMAP_ADDR        VM_MAXUSER_ADDRESS
   98 
   99 #ifdef __mips_n64
  100 #define VM_MAXUSER_ADDRESS      (VM_MINUSER_ADDRESS + (NPDEPG * NBSEG))
  101 #define VM_MIN_KERNEL_ADDRESS   ((vm_offset_t)0xc000000000000000)
  102 #define VM_MAX_KERNEL_ADDRESS   (VM_MIN_KERNEL_ADDRESS + (NPDEPG * NBSEG))
  103 #else
  104 #define VM_MAXUSER_ADDRESS      ((vm_offset_t)0x80000000)
  105 #define VM_MIN_KERNEL_ADDRESS   ((vm_offset_t)0xC0000000)
  106 #define VM_MAX_KERNEL_ADDRESS   ((vm_offset_t)0xFFFFC000)
  107 #endif
  108 
  109 #define KERNBASE                ((vm_offset_t)(intptr_t)(int32_t)0x80000000)
  110 /*
  111  * USRSTACK needs to start a little below 0x8000000 because the R8000
  112  * and some QED CPUs perform some virtual address checks before the
  113  * offset is calculated.
  114  */
  115 #define USRSTACK                (VM_MAXUSER_ADDRESS - PAGE_SIZE)
  116  
  117 /*
  118  * Only one memory domain.
  119  */
  120 #ifndef VM_NDOMAIN
  121 #define VM_NDOMAIN              1
  122 #endif
  123 
  124 /*
  125  * Disable superpage reservations. (not sure if this is right
  126  * I copied it from ARM)
  127  */
  128 #ifndef VM_NRESERVLEVEL
  129 #define VM_NRESERVLEVEL         0
  130 #endif
  131 
  132 /* virtual sizes (bytes) for various kernel submaps */
  133 #ifndef VM_KMEM_SIZE
  134 #define VM_KMEM_SIZE            (12 * 1024 * 1024)
  135 #endif
  136 
  137 /*
  138  * How many physical pages per KVA page allocated.
  139  * min(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), VM_KMEM_SIZE_MAX)
  140  * is the total KVA space allocated for kmem_map.
  141  */
  142 #ifndef VM_KMEM_SIZE_SCALE
  143 #define VM_KMEM_SIZE_SCALE      (3)
  144 #endif
  145 
  146 /*
  147  * Ceiling on amount of kmem_map kva space.
  148  */
  149 #ifndef VM_KMEM_SIZE_MAX
  150 #define VM_KMEM_SIZE_MAX        (200 * 1024 * 1024)
  151 #endif
  152 
  153 /* initial pagein size of beginning of executable file */
  154 #ifndef VM_INITIAL_PAGEIN
  155 #define VM_INITIAL_PAGEIN       16
  156 #endif
  157 
  158 /*
  159  * max number of non-contig chunks of physical RAM you can have
  160  */
  161 #define VM_PHYSSEG_MAX          32
  162 
  163 /*
  164  * The physical address space is sparsely populated.
  165  */
  166 #define VM_PHYSSEG_SPARSE
  167 
  168 /*
  169  * Create three free page pools: VM_FREEPOOL_DEFAULT is the default pool
  170  * from which physical pages are allocated and VM_FREEPOOL_DIRECT is
  171  * the pool from which physical pages for small UMA objects are
  172  * allocated.
  173  */
  174 #define VM_NFREEPOOL            3
  175 #define VM_FREEPOOL_CACHE       2
  176 #define VM_FREEPOOL_DEFAULT     0
  177 #define VM_FREEPOOL_DIRECT      1
  178 
  179 /*
  180  * we support 2 free lists:
  181  *
  182  *      - DEFAULT for direct mapped (KSEG0) pages.
  183  *        Note: This usage of DEFAULT may be misleading because we use
  184  *        DEFAULT for allocating direct mapped pages. The normal page
  185  *        allocations use HIGHMEM if available, and then DEFAULT. 
  186  *      - HIGHMEM for other pages 
  187  */
  188 #ifdef __mips_n64
  189 #define VM_NFREELIST            1
  190 #define VM_FREELIST_DEFAULT     0
  191 #define VM_FREELIST_DIRECT      VM_FREELIST_DEFAULT
  192 #else
  193 #define VM_NFREELIST            2
  194 #define VM_FREELIST_DEFAULT     1
  195 #define VM_FREELIST_HIGHMEM     0
  196 #define VM_FREELIST_DIRECT      VM_FREELIST_DEFAULT
  197 #define VM_HIGHMEM_ADDRESS      ((vm_paddr_t)0x20000000)
  198 #endif
  199 
  200 /*
  201  * The largest allocation size is 1MB.
  202  */
  203 #define VM_NFREEORDER           9
  204 
  205 #define ZERO_REGION_SIZE        (64 * 1024)     /* 64KB */
  206 
  207 #endif /* !_MACHINE_VMPARAM_H_ */

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