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/arm/include/vmparam.h

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    1 /*      $NetBSD: vmparam.h,v 1.26 2003/08/07 16:27:47 agc Exp $ */
    2 
    3 /*-
    4  * SPDX-License-Identifier: BSD-3-Clause
    5  *
    6  * Copyright (c) 1988 The Regents of the University of California.
    7  * All rights reserved.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 3. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  * $FreeBSD$
   34  */
   35 
   36 #ifndef _MACHINE_VMPARAM_H_
   37 #define _MACHINE_VMPARAM_H_
   38 
   39 /*
   40  * Machine dependent constants for ARM.
   41  */
   42 
   43 /*
   44  * Virtual memory related constants, all in bytes
   45  */
   46 #ifndef MAXTSIZ
   47 #define MAXTSIZ         (256UL*1024*1024)       /* max text size */
   48 #endif
   49 #ifndef DFLDSIZ
   50 #define DFLDSIZ         (128UL*1024*1024)       /* initial data size limit */
   51 #endif
   52 #ifndef MAXDSIZ
   53 #define MAXDSIZ         (512UL*1024*1024)       /* max data size */
   54 #endif
   55 #ifndef DFLSSIZ
   56 #define DFLSSIZ         (4UL*1024*1024)         /* initial stack size limit */
   57 #endif
   58 #ifndef MAXSSIZ
   59 #define MAXSSIZ         (64UL*1024*1024)        /* max stack size */
   60 #endif
   61 #ifndef SGROWSIZ
   62 #define SGROWSIZ        (128UL*1024)            /* amount to grow stack */
   63 #endif
   64 
   65 /*
   66  * Address space constants
   67  */
   68 
   69 /*
   70  * The line between user space and kernel space
   71  * Mappings >= KERNEL_BASE are constant across all processes
   72  */
   73 #ifndef KERNBASE
   74 #define KERNBASE                0xc0000000
   75 #endif
   76 
   77 /*
   78  * The virtual address the kernel is linked to run at.  For armv4/5 platforms
   79  * the low-order 30 bits of this must match the low-order bits of the physical
   80  * address the kernel is loaded at, so the value is most often provided as a
   81  * kernel config option in the std.platform file. For armv6/7 the kernel can
   82  * be loaded at any 2MB boundary, and KERNVIRTADDR can also be set to any 2MB
   83  * boundary.  It is typically overridden in the std.platform file only when
   84  * KERNBASE is also set to a lower address to provide more KVA.
   85  */
   86 #ifndef KERNVIRTADDR
   87 #define KERNVIRTADDR            0xc0000000
   88 #endif
   89 
   90 /*
   91  * max number of non-contig chunks of physical RAM you can have
   92  */
   93 
   94 #define VM_PHYSSEG_MAX          32
   95 
   96 /*
   97  * The physical address space may be sparsely populated on some ARM systems.
   98  */
   99 #define VM_PHYSSEG_SPARSE
  100 
  101 /*
  102  * Create one free page pool.  Since the ARM kernel virtual address
  103  * space does not include a mapping onto the machine's entire physical
  104  * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default
  105  * pool, VM_FREEPOOL_DEFAULT.
  106  */
  107 #define VM_NFREEPOOL            1
  108 #define VM_FREEPOOL_DEFAULT     0
  109 #define VM_FREEPOOL_DIRECT      0
  110 
  111 /*
  112  * We need just one free list:  DEFAULT.
  113  */
  114 #define VM_NFREELIST            1
  115 #define VM_FREELIST_DEFAULT     0
  116 
  117 /*
  118  * The largest allocation size is 1MB.
  119  */
  120 #define VM_NFREEORDER           9
  121 
  122 /*
  123  * Enable superpage reservations: 1 level.
  124  */
  125 #ifndef VM_NRESERVLEVEL
  126 #define VM_NRESERVLEVEL         1
  127 #endif
  128 
  129 /*
  130  * Level 0 reservations consist of 256 pages.
  131  */
  132 #ifndef VM_LEVEL_0_ORDER
  133 #define VM_LEVEL_0_ORDER        8
  134 #endif
  135 
  136 #define VM_MIN_ADDRESS          (0x00001000)
  137 #ifndef VM_MAXUSER_ADDRESS
  138 #define VM_MAXUSER_ADDRESS      (KERNBASE - 0x00400000) /* !!! PT2MAP_SIZE */
  139 #endif
  140 #define VM_MAX_ADDRESS          VM_MAXUSER_ADDRESS
  141 
  142 #define SHAREDPAGE              (VM_MAXUSER_ADDRESS - PAGE_SIZE)
  143 #define USRSTACK                SHAREDPAGE
  144 
  145 /* initial pagein size of beginning of executable file */
  146 #ifndef VM_INITIAL_PAGEIN
  147 #define VM_INITIAL_PAGEIN       16
  148 #endif
  149 
  150 #ifndef VM_MIN_KERNEL_ADDRESS
  151 #define VM_MIN_KERNEL_ADDRESS KERNBASE
  152 #endif
  153 
  154 #define VM_MAX_KERNEL_ADDRESS   (vm_max_kernel_address)
  155 
  156 /*
  157  * How many physical pages per kmem arena virtual page.
  158  */
  159 #ifndef VM_KMEM_SIZE_SCALE
  160 #define VM_KMEM_SIZE_SCALE      (3)
  161 #endif
  162 
  163 /*
  164  * Optional floor (in bytes) on the size of the kmem arena.
  165  */
  166 #ifndef VM_KMEM_SIZE_MIN
  167 #define VM_KMEM_SIZE_MIN        (12 * 1024 * 1024)
  168 #endif
  169 
  170 /*
  171  * Optional ceiling (in bytes) on the size of the kmem arena: 40% of the
  172  * kernel map.
  173  */
  174 #ifndef VM_KMEM_SIZE_MAX
  175 #define VM_KMEM_SIZE_MAX        ((vm_max_kernel_address - \
  176     VM_MIN_KERNEL_ADDRESS + 1) * 2 / 5)
  177 #endif
  178 
  179 extern vm_offset_t vm_max_kernel_address;
  180 
  181 #define ZERO_REGION_SIZE        (64 * 1024)     /* 64KB */
  182 
  183 #ifndef VM_MAX_AUTOTUNE_MAXUSERS
  184 #define VM_MAX_AUTOTUNE_MAXUSERS        384
  185 #endif
  186 
  187 #define SFBUF
  188 #define SFBUF_MAP
  189 
  190 #define PMAP_HAS_DMAP   0
  191 #define PHYS_TO_DMAP(x) ({ panic("No direct map exists"); 0; })
  192 #define DMAP_TO_PHYS(x) ({ panic("No direct map exists"); 0; })
  193 
  194 #define DEVMAP_MAX_VADDR        ARM_VECTORS_HIGH
  195 
  196 /*
  197  * No non-transparent large page support in the pmap.
  198  */
  199 #define PMAP_HAS_LARGEPAGES     0
  200 
  201 /*
  202  * Need a page dump array for minidump.
  203  */
  204 #define MINIDUMP_PAGE_TRACKING  1
  205 
  206 #endif  /* _MACHINE_VMPARAM_H_ */

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