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: releng/8.0/sys/mips/include/vmparam.h 178172 2008-04-13 07:27:37Z imp $
   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  * USRSTACK needs to start a little below 0x8000000 because the R8000
   56  * and some QED CPUs perform some virtual address checks before the
   57  * offset is calculated.
   58  */
   59 #define USRSTACK        0x7ffff000      /* Start of user stack */
   60 
   61 /*
   62  * Virtual memory related constants, all in bytes
   63  */
   64 #ifndef MAXTSIZ
   65 #define MAXTSIZ         (128UL*1024*1024)       /* max text size */
   66 #endif
   67 #ifndef DFLDSIZ
   68 #define DFLDSIZ         (128UL*1024*1024)       /* initial data size limit */
   69 #endif
   70 #ifndef MAXDSIZ
   71 #define MAXDSIZ         (1*1024UL*1024*1024)    /* max data size */
   72 #endif
   73 #ifndef DFLSSIZ
   74 #define DFLSSIZ         (8UL*1024*1024)         /* initial stack size limit */
   75 #endif
   76 #ifndef MAXSSIZ
   77 #define MAXSSIZ         (64UL*1024*1024)        /* max stack size */
   78 #endif
   79 #ifndef SGROWSIZ
   80 #define SGROWSIZ        (128UL*1024)            /* amount to grow stack */
   81 #endif
   82 
   83 /* 
   84  * The time for a process to be blocked before being very swappable.
   85  * This is a number of seconds which the system takes as being a non-trivial
   86  * amount of real time.  You probably shouldn't change this;
   87  * it is used in subtle ways (fractions and multiples of it are, that is, like
   88  * half of a ``long time'', almost a long time, etc.)
   89  * It is related to human patience and other factors which don't really
   90  * change over time.
   91  */
   92 #define MAXSLP          20
   93 
   94 /*
   95  * Mach derived constants
   96  */
   97 
   98 /* user/kernel map constants */
   99 #define VM_MIN_ADDRESS          ((vm_offset_t)0x00000000)
  100 #define VM_MAXUSER_ADDRESS      ((vm_offset_t)0x80000000)
  101 #define VM_MAX_MMAP_ADDR        VM_MAXUSER_ADDRESS
  102 #define VM_MAX_ADDRESS          ((vm_offset_t)0x80000000)
  103 
  104 #ifndef VM_KERNEL_ALLOC_OFFSET
  105 #define VM_KERNEL_ALLOC_OFFSET  ((vm_offset_t)0x00000000)
  106 #endif
  107 
  108 #define VM_MIN_KERNEL_ADDRESS           ((vm_offset_t)0xC0000000)
  109 #define VM_KERNEL_WIRED_ADDR_END        (VM_MIN_KERNEL_ADDRESS + VM_KERNEL_ALLOC_OFFSET)
  110 #define VM_MAX_KERNEL_ADDRESS   ((vm_offset_t)0xFFFFC000)
  111 
  112 /*
  113  * Disable superpage reservations. (not sure if this is right
  114  * I copied it from ARM)
  115  */
  116 #ifndef VM_NRESERVLEVEL
  117 #define VM_NRESERVLEVEL         0
  118 #endif
  119 
  120 
  121 /* virtual sizes (bytes) for various kernel submaps */
  122 #ifndef VM_KMEM_SIZE
  123 #define VM_KMEM_SIZE            (12 * 1024 * 1024)
  124 #endif
  125 
  126 /*
  127  * How many physical pages per KVA page allocated.
  128  * min(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), VM_KMEM_SIZE_MAX)
  129  * is the total KVA space allocated for kmem_map.
  130  */
  131 #ifndef VM_KMEM_SIZE_SCALE
  132 #define VM_KMEM_SIZE_SCALE      (3)
  133 #endif
  134 
  135 /*
  136  * Ceiling on amount of kmem_map kva space.
  137  */
  138 #ifndef VM_KMEM_SIZE_MAX
  139 #define VM_KMEM_SIZE_MAX        (200 * 1024 * 1024)
  140 #endif
  141 
  142 /* initial pagein size of beginning of executable file */
  143 #ifndef VM_INITIAL_PAGEIN
  144 #define VM_INITIAL_PAGEIN       16
  145 #endif
  146 
  147 /*
  148  * max number of non-contig chunks of physical RAM you can have
  149  */
  150 #define VM_PHYSSEG_MAX          32
  151 
  152 /*
  153  * The physical address space is densely populated.
  154  */
  155 #define VM_PHYSSEG_DENSE
  156 
  157 /*
  158  * Create three free page pools: VM_FREEPOOL_DEFAULT is the default pool
  159  * from which physical pages are allocated and VM_FREEPOOL_DIRECT is
  160  * the pool from which physical pages for small UMA objects are
  161  * allocated.
  162  */
  163 #define VM_NFREEPOOL            3
  164 #define VM_FREEPOOL_CACHE       2
  165 #define VM_FREEPOOL_DEFAULT     0
  166 #define VM_FREEPOOL_DIRECT      1
  167 
  168 /*
  169  * we support 1 free list:
  170  *
  171  *      - DEFAULT for all systems
  172  */
  173 
  174 #define VM_NFREELIST            1
  175 #define VM_FREELIST_DEFAULT     0
  176 
  177 /*
  178  * The largest allocation size is 1MB.
  179  */
  180 #define VM_NFREEORDER           9
  181 
  182 /*
  183  * XXXMIPS: This values need to be changed!!!
  184  */ 
  185 #if 0
  186 #define VM_MIN_ADDRESS          ((vm_offset_t)0x0000000000010000)
  187 #define VM_MAXUSER_ADDRESS      ((vm_offset_t)MIPS_KSEG0_START-1)
  188 #define VM_MAX_ADDRESS          ((vm_offset_t)0x0000000100000000)
  189 #define VM_MIN_KERNEL_ADDRESS   ((vm_offset_t)MIPS_KSEG3_START)
  190 #define VM_MAX_KERNEL_ADDRESS   ((vm_offset_t)MIPS_KSEG3_END)
  191 #define KERNBASE                (VM_MIN_KERNEL_ADDRESS)
  192 
  193 /* virtual sizes (bytes) for various kernel submaps */
  194 #define VM_KMEM_SIZE            (16*1024*1024)          /* XXX ??? */
  195 #endif
  196 
  197 #define NBSEG           0x400000        /* bytes/segment */
  198 #define SEGOFSET        (NBSEG-1)       /* byte offset into segment */
  199 #define SEGSHIFT        22              /* LOG2(NBSEG) */
  200 
  201 #endif /* !_MACHINE_VMPARAM_H_ */

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