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/sparc64/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  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the University of
   21  *      California, Berkeley and its contributors.
   22  * 4. Neither the name of the University nor the names of its contributors
   23  *    may be used to endorse or promote products derived from this software
   24  *    without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   36  * SUCH DAMAGE.
   37  *
   38  *      from: @(#)vmparam.h     5.9 (Berkeley) 5/12/91
   39  *      from: FreeBSD: src/sys/i386/include/vmparam.h,v 1.33 2000/03/30
   40  * $FreeBSD: releng/6.0/sys/sparc64/include/vmparam.h 108332 2002-12-27 19:31:26Z jake $
   41  */
   42 
   43 
   44 #ifndef _MACHINE_VMPARAM_H_
   45 #define _MACHINE_VMPARAM_H_
   46 
   47 /*
   48  * Virtual memory related constants, all in bytes
   49  */
   50 #ifndef MAXTSIZ
   51 #define MAXTSIZ         (1*1024*1024*1024)      /* max text size */
   52 #endif
   53 #ifndef DFLDSIZ
   54 #define DFLDSIZ         (128*1024*1024)         /* initial data size limit */
   55 #endif
   56 #ifndef MAXDSIZ
   57 #define MAXDSIZ         (1*1024*1024*1024)      /* max data size */
   58 #endif
   59 #ifndef DFLSSIZ
   60 #define DFLSSIZ         (128*1024*1024)         /* initial stack size limit */
   61 #endif
   62 #ifndef MAXSSIZ
   63 #define MAXSSIZ         (1*1024*1024*1024)      /* max stack size */
   64 #endif
   65 #ifndef SGROWSIZ
   66 #define SGROWSIZ        (128*1024)              /* amount to grow stack */
   67 #endif
   68 
   69 /*
   70  * The time for a process to be blocked before being very swappable.
   71  * This is a number of seconds which the system takes as being a non-trivial
   72  * amount of real time.  You probably shouldn't change this;
   73  * it is used in subtle ways (fractions and multiples of it are, that is, like
   74  * half of a ``long time'', almost a long time, etc.)
   75  * It is related to human patience and other factors which don't really
   76  * change over time.
   77  */
   78 #define MAXSLP                  20
   79 
   80 /*
   81  * Address space layout.
   82  *
   83  * UltraSPARC I and II implement a 44 bit virtual address space.  The address
   84  * space is split into 2 regions at each end of the 64 bit address space, with
   85  * an out of range "hole" in the middle.  UltraSPARC III implements the full
   86  * 64 bit virtual address space, but we don't really have any use for it and
   87  * 43 bits of user address space is considered to be "enough", so we ignore it.
   88  *
   89  * Upper region:        0xffffffffffffffff
   90  *                      0xfffff80000000000
   91  * 
   92  * Hole:                0xfffff7ffffffffff
   93  *                      0x0000080000000000
   94  *
   95  * Lower region:        0x000007ffffffffff
   96  *                      0x0000000000000000
   97  *
   98  * In general we ignore the upper region, and use the lower region as mappable
   99  * space.
  100  *
  101  * We define some interesting address constants:
  102  *
  103  * VM_MIN_ADDRESS and VM_MAX_ADDRESS define the start and of the entire 64 bit
  104  * address space, mostly just for convenience.
  105  *
  106  * VM_MIN_DIRECT_ADDRESS and VM_MAX_DIRECT_ADDRESS define the start and end
  107  * of the direct mapped region.  This maps virtual addresses to physical
  108  * addresses directly using 4mb tlb entries, with the physical address encoded
  109  * in the lower 43 bits of virtual address.  These mappings are convenient
  110  * because they do not require page tables, and because they never change they
  111  * do not require tlb flushes.  However, since these mappings are cacheable,
  112  * we must ensure that all pages accessed this way are either not double
  113  * mapped, or that all other mappings have virtual color equal to physical
  114  * color, in order to avoid creating illegal aliases in the data cache.
  115  *
  116  * VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of
  117  * mappable kernel virtual address space.  VM_MIN_KERNEL_ADDRESS is basically
  118  * arbitrary, a convenient address is chosen which allows both the kernel text
  119  * and data and the prom's address space to be mapped with 1 4mb tsb page.
  120  * VM_MAX_KERNEL_ADDRESS is variable, computed at startup time based on the
  121  * amount of physical memory available.  Each 4mb tsb page provides 1g of
  122  * virtual address space, with the only practical limit being available
  123  * phsyical memory.
  124  *
  125  * VM_MIN_PROM_ADDRESS and VM_MAX_PROM_ADDRESS define the start and end of the
  126  * prom address space.  On startup the prom's mappings are duplicated in the
  127  * kernel tsb, to allow prom memory to be accessed normally by the kernel.
  128  *
  129  * VM_MIN_USER_ADDRESS and VM_MAX_USER_ADDRESS define the start and end of the
  130  * user address space.  There are some hardware errata about using addresses
  131  * at the boundary of the va hole, so we allow just under 43 bits of user
  132  * address space.  Note that the kernel and user address spaces overlap, but
  133  * this doesn't matter because they use different tlb contexts, and because
  134  * the kernel address space is not mapped into each process' address space.
  135  */
  136 #define VM_MIN_ADDRESS          (0x0000000000000000UL)
  137 #define VM_MAX_ADDRESS          (0xffffffffffffffffUL)
  138 
  139 #define VM_MIN_DIRECT_ADDRESS   (0xfffff80000000000UL)
  140 #define VM_MAX_DIRECT_ADDRESS   (VM_MAX_ADDRESS)
  141 
  142 #define VM_MIN_KERNEL_ADDRESS   (0x00000000c0000000UL)
  143 #define VM_MAX_KERNEL_ADDRESS   (vm_max_kernel_address)
  144 
  145 #define VM_MIN_PROM_ADDRESS     (0x00000000f0000000UL)
  146 #define VM_MAX_PROM_ADDRESS     (0x00000000ffffe000UL)
  147 
  148 #define VM_MIN_USER_ADDRESS     (0x0000000000000000UL)
  149 #define VM_MAX_USER_ADDRESS     (0x000007fe00000000UL)
  150 
  151 #define VM_MINUSER_ADDRESS      (VM_MIN_USER_ADDRESS)
  152 #define VM_MAXUSER_ADDRESS      (VM_MAX_USER_ADDRESS)
  153 
  154 #define KERNBASE                (VM_MIN_KERNEL_ADDRESS)
  155 #define USRSTACK                (VM_MAX_USER_ADDRESS)
  156 
  157 /*
  158  * Virtual size (bytes) for various kernel submaps.
  159  */
  160 #ifndef VM_KMEM_SIZE
  161 #define VM_KMEM_SIZE            (16*1024*1024)
  162 #endif
  163 
  164 /*
  165  * How many physical pages per KVA page allocated.
  166  * min(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), VM_KMEM_SIZE_MAX)
  167  * is the total KVA space allocated for kmem_map.
  168  */
  169 #ifndef VM_KMEM_SIZE_SCALE
  170 #define VM_KMEM_SIZE_SCALE      (3)
  171 #endif
  172 
  173 /*
  174  * Initial pagein size of beginning of executable file.
  175  */
  176 #ifndef VM_INITIAL_PAGEIN
  177 #define VM_INITIAL_PAGEIN       16
  178 #endif
  179 
  180 #define UMA_MD_SMALL_ALLOC
  181 
  182 extern vm_offset_t vm_max_kernel_address;
  183 
  184 #endif /* !_MACHINE_VMPARAM_H_ */

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