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/amd64/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  * Copyright (c) 2003 Peter Wemm
    7  * All rights reserved.
    8  *
    9  * This code is derived from software contributed to Berkeley by
   10  * William Jolitz.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. All advertising materials mentioning features or use of this software
   21  *    must display the following acknowledgement:
   22  *      This product includes software developed by the University of
   23  *      California, Berkeley and its contributors.
   24  * 4. Neither the name of the University nor the names of its contributors
   25  *    may be used to endorse or promote products derived from this software
   26  *    without specific prior written permission.
   27  *
   28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   38  * SUCH DAMAGE.
   39  *
   40  *      from: @(#)vmparam.h     5.9 (Berkeley) 5/12/91
   41  * $FreeBSD$
   42  */
   43 
   44 
   45 #ifndef _MACHINE_VMPARAM_H_
   46 #define _MACHINE_VMPARAM_H_ 1
   47 
   48 /*
   49  * Machine dependent constants for AMD64.
   50  */
   51 
   52 /*
   53  * Virtual memory related constants, all in bytes
   54  */
   55 #define MAXTSIZ         (128UL*1024*1024)       /* max text size */
   56 #ifndef DFLDSIZ
   57 #define DFLDSIZ         (128UL*1024*1024)       /* initial data size limit */
   58 #endif
   59 #ifndef MAXDSIZ
   60 #define MAXDSIZ         (32768UL*1024*1024)     /* max data size */
   61 #endif
   62 #ifndef DFLSSIZ
   63 #define DFLSSIZ         (8UL*1024*1024)         /* initial stack size limit */
   64 #endif
   65 #ifndef MAXSSIZ
   66 #define MAXSSIZ         (512UL*1024*1024)       /* max stack size */
   67 #endif
   68 #ifndef SGROWSIZ
   69 #define SGROWSIZ        (128UL*1024)            /* amount to grow stack */
   70 #endif
   71 
   72 /*
   73  * The time for a process to be blocked before being very swappable.
   74  * This is a number of seconds which the system takes as being a non-trivial
   75  * amount of real time.  You probably shouldn't change this;
   76  * it is used in subtle ways (fractions and multiples of it are, that is, like
   77  * half of a ``long time'', almost a long time, etc.)
   78  * It is related to human patience and other factors which don't really
   79  * change over time.
   80  */
   81 #define MAXSLP          20
   82 
   83 /*
   84  * We provide a machine specific single page allocator through the use
   85  * of the direct mapped segment.  This uses 2MB pages for reduced
   86  * TLB pressure.
   87  */
   88 #define UMA_MD_SMALL_ALLOC
   89 
   90 /*
   91  * The physical address space is densely populated.
   92  */
   93 #define VM_PHYSSEG_DENSE
   94 
   95 /*
   96  * The number of PHYSSEG entries must be one greater than the number
   97  * of phys_avail entries because the phys_avail entry that spans the
   98  * largest physical address that is accessible by ISA DMA is split
   99  * into two PHYSSEG entries. 
  100  */
  101 #define VM_PHYSSEG_MAX          31
  102 
  103 /*
  104  * Create three free page pools: VM_FREEPOOL_DEFAULT is the default pool
  105  * from which physical pages are allocated and VM_FREEPOOL_DIRECT is
  106  * the pool from which physical pages for page tables and small UMA
  107  * objects are allocated.
  108  */
  109 #define VM_NFREEPOOL            3
  110 #define VM_FREEPOOL_CACHE       2
  111 #define VM_FREEPOOL_DEFAULT     0
  112 #define VM_FREEPOOL_DIRECT      1
  113 
  114 /*
  115  * Create two free page lists: VM_FREELIST_DEFAULT is for physical
  116  * pages that are above the largest physical address that is
  117  * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
  118  * that are below that address.
  119  */
  120 #define VM_NFREELIST            2
  121 #define VM_FREELIST_DEFAULT     0
  122 #define VM_FREELIST_ISADMA      1
  123 
  124 /*
  125  * An allocation size of 16MB is supported in order to optimize the
  126  * use of the direct map by UMA.  Specifically, a cache line contains
  127  * at most 8 PDEs, collectively mapping 16MB of physical memory.  By
  128  * reducing the number of distinct 16MB "pages" that are used by UMA,
  129  * the physical memory allocator reduces the likelihood of both 2MB
  130  * page TLB misses and cache misses caused by 2MB page TLB misses.
  131  */
  132 #define VM_NFREEORDER           13
  133 
  134 /*
  135  * Virtual addresses of things.  Derived from the page directory and
  136  * page table indexes from pmap.h for precision.
  137  *
  138  * 0x0000000000000000 - 0x00007fffffffffff   user map
  139  * 0x0000800000000000 - 0xffff7fffffffffff   does not exist (hole)
  140  * 0xffff800000000000 - 0xffff804020100fff   recursive page table (512GB slot)
  141  * 0xffff804020101000 - 0xfffffeffffffffff   unused
  142  * 0xffffff0000000000 - 0xffffff7fffffffff   512GB direct map mappings
  143  * 0xffffff8000000000 - 0xffffffff7fffffff   unused (510GB)
  144  * 0xffffffff80000000 - 0xffffffffffffffff   2GB kernel map
  145  *
  146  * Within the kernel map:
  147  * 0xffffffff80000000                        KERNBASE
  148  */
  149 
  150 #define VM_MAX_KERNEL_ADDRESS   KVADDR(KPML4I, NPDPEPG-1, NKPDE-1, NPTEPG-1)
  151 #define VM_MIN_KERNEL_ADDRESS   KVADDR(KPML4I, KPDPI, 0, 0)
  152 
  153 #define DMAP_MIN_ADDRESS        KVADDR(DMPML4I, 0, 0, 0)
  154 #define DMAP_MAX_ADDRESS        KVADDR(DMPML4I+1, 0, 0, 0)
  155 
  156 #define KERNBASE                KVADDR(KPML4I, KPDPI, 0, 0)
  157 
  158 #define UPT_MAX_ADDRESS         KVADDR(PML4PML4I, PML4PML4I, PML4PML4I, PML4PML4I)
  159 #define UPT_MIN_ADDRESS         KVADDR(PML4PML4I, 0, 0, 0)
  160 
  161 #define VM_MAXUSER_ADDRESS      UVADDR(NUPML4E, 0, 0, 0)
  162 
  163 #define USRSTACK                VM_MAXUSER_ADDRESS
  164 
  165 #define VM_MAX_ADDRESS          UPT_MAX_ADDRESS
  166 #define VM_MIN_ADDRESS          (0)
  167 
  168 #define PHYS_TO_DMAP(x)         ((x) | DMAP_MIN_ADDRESS)
  169 #define DMAP_TO_PHYS(x)         ((x) & ~DMAP_MIN_ADDRESS)
  170 
  171 /* virtual sizes (bytes) for various kernel submaps */
  172 #ifndef VM_KMEM_SIZE
  173 #define VM_KMEM_SIZE            (12 * 1024 * 1024)
  174 #endif
  175 
  176 /*
  177  * How many physical pages per KVA page allocated.
  178  * min(max(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE),
  179  *     VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX)
  180  * is the total KVA space allocated for kmem_map.
  181  */
  182 #ifndef VM_KMEM_SIZE_SCALE
  183 #define VM_KMEM_SIZE_SCALE      (3)
  184 #endif
  185 
  186 /*
  187  * Ceiling on amount of kmem_map kva space.
  188  */
  189 #ifndef VM_KMEM_SIZE_MAX
  190 #define VM_KMEM_SIZE_MAX        (400 * 1024 * 1024)
  191 #endif
  192 
  193 /* initial pagein size of beginning of executable file */
  194 #ifndef VM_INITIAL_PAGEIN
  195 #define VM_INITIAL_PAGEIN       16
  196 #endif
  197 
  198 #endif /* _MACHINE_VMPARAM_H_ */

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