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/uvm/uvm_param.h

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    1 /*      $NetBSD: uvm_param.h,v 1.21 2006/08/04 22:42:36 he Exp $        */
    2 
    3 /*
    4  * Copyright (c) 1991, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * The Mach Operating System project at Carnegie-Mellon University.
    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. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)vm_param.h  8.2 (Berkeley) 1/9/95
   35  *
   36  *
   37  * Copyright (c) 1987, 1990 Carnegie-Mellon University.
   38  * All rights reserved.
   39  *
   40  * Authors: Avadis Tevanian, Jr., Michael Wayne Young
   41  *
   42  * Permission to use, copy, modify and distribute this software and
   43  * its documentation is hereby granted, provided that both the copyright
   44  * notice and this permission notice appear in all copies of the
   45  * software, derivative works or modified versions, and any portions
   46  * thereof, and that both notices appear in supporting documentation.
   47  *
   48  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   49  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
   50  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   51  *
   52  * Carnegie Mellon requests users of this software to return to
   53  *
   54  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   55  *  School of Computer Science
   56  *  Carnegie Mellon University
   57  *  Pittsburgh PA 15213-3890
   58  *
   59  * any improvements or extensions that they make and grant Carnegie the
   60  * rights to redistribute these changes.
   61  */
   62 
   63 /*
   64  *      Machine independent virtual memory parameters.
   65  */
   66 
   67 #ifndef _VM_PARAM_
   68 #define _VM_PARAM_
   69 
   70 #ifdef _KERNEL_OPT
   71 #include "opt_uvm.h"
   72 #endif
   73 #ifdef _KERNEL
   74 #include <sys/types.h>
   75 #include <sys/lock.h>
   76 #include <machine/vmparam.h>
   77 #include <sys/resourcevar.h>
   78 #endif
   79 
   80 #if defined(_KERNEL)
   81 
   82 #if defined(PAGE_SIZE)
   83 
   84 /*
   85  * If PAGE_SIZE is defined at this stage, it must be a constant.
   86  */
   87 
   88 #if PAGE_SIZE == 0
   89 #error Invalid PAGE_SIZE definition
   90 #endif
   91 
   92 /*
   93  * If the platform does not need to support a variable PAGE_SIZE,
   94  * then provide default values for MIN_PAGE_SIZE and MAX_PAGE_SIZE.
   95  */
   96 
   97 #if !defined(MIN_PAGE_SIZE)
   98 #define MIN_PAGE_SIZE   PAGE_SIZE
   99 #endif /* ! MIN_PAGE_SIZE */
  100 
  101 #if !defined(MAX_PAGE_SIZE)
  102 #define MAX_PAGE_SIZE   PAGE_SIZE
  103 #endif /* ! MAX_PAGE_SIZE */
  104 
  105 #else /* ! PAGE_SIZE */
  106 
  107 /*
  108  * PAGE_SIZE is not a constant; MIN_PAGE_SIZE and MAX_PAGE_SIZE must
  109  * be defined.
  110  */
  111 
  112 #if !defined(MIN_PAGE_SIZE)
  113 #error MIN_PAGE_SIZE not defined
  114 #endif
  115 
  116 #if !defined(MAX_PAGE_SIZE)
  117 #error MAX_PAGE_SIZE not defined
  118 #endif
  119 
  120 #endif /* PAGE_SIZE */
  121 
  122 /*
  123  * MIN_PAGE_SIZE and MAX_PAGE_SIZE must be constants.
  124  */
  125 
  126 #if MIN_PAGE_SIZE == 0
  127 #error Invalid MIN_PAGE_SIZE definition
  128 #endif
  129 
  130 #if MAX_PAGE_SIZE == 0
  131 #error Invalid MAX_PAGE_SIZE definition
  132 #endif
  133 
  134 /*
  135  * If MIN_PAGE_SIZE and MAX_PAGE_SIZE are not equal, then we must use
  136  * non-constant PAGE_SIZE, et al for LKMs.
  137  */
  138 #if (MIN_PAGE_SIZE != MAX_PAGE_SIZE) && defined(_LKM)
  139 #undef PAGE_SIZE
  140 #undef PAGE_MASK
  141 #undef PAGE_SHIFT
  142 #endif
  143 
  144 /*
  145  * Now provide PAGE_SIZE, PAGE_MASK, and PAGE_SHIFT if we do not
  146  * have ones that are compile-time constants.
  147  */
  148 #if !defined(PAGE_SIZE)
  149 #define PAGE_SIZE       uvmexp.pagesize         /* size of page */
  150 #define PAGE_MASK       uvmexp.pagemask         /* size of page - 1 */
  151 #define PAGE_SHIFT      uvmexp.pageshift        /* bits to shift for pages */
  152 #endif /* PAGE_SIZE */
  153 
  154 #endif /* _KERNEL */
  155 
  156 /*
  157  * CTL_VM identifiers
  158  */
  159 #define VM_METER        1               /* struct vmmeter */
  160 #define VM_LOADAVG      2               /* struct loadavg */
  161 #define VM_UVMEXP       3               /* struct uvmexp */
  162 #define VM_NKMEMPAGES   4               /* kmem_map pages */
  163 #define VM_UVMEXP2      5               /* struct uvmexp_sysctl */
  164 #define VM_ANONMIN      6
  165 #define VM_EXECMIN      7
  166 #define VM_FILEMIN      8
  167 #define VM_MAXSLP       9
  168 #define VM_USPACE       10
  169 #define VM_ANONMAX      11
  170 #define VM_EXECMAX      12
  171 #define VM_FILEMAX      13
  172 
  173 #define VM_MAXID        14              /* number of valid vm ids */
  174 
  175 #define CTL_VM_NAMES { \
  176         { 0, 0 }, \
  177         { "vmmeter", CTLTYPE_STRUCT }, \
  178         { "loadavg", CTLTYPE_STRUCT }, \
  179         { "uvmexp", CTLTYPE_STRUCT }, \
  180         { "nkmempages", CTLTYPE_INT }, \
  181         { "uvmexp2", CTLTYPE_STRUCT }, \
  182         { "anonmin", CTLTYPE_INT }, \
  183         { "execmin", CTLTYPE_INT }, \
  184         { "filemin", CTLTYPE_INT }, \
  185         { "maxslp", CTLTYPE_INT }, \
  186         { "uspace", CTLTYPE_INT }, \
  187         { "anonmax", CTLTYPE_INT }, \
  188         { "execmax", CTLTYPE_INT }, \
  189         { "filemax", CTLTYPE_INT }, \
  190 }
  191 
  192 #ifndef ASSEMBLER
  193 /*
  194  *      Convert addresses to pages and vice versa.
  195  *      No rounding is used.
  196  */
  197 #ifdef _KERNEL
  198 #define atop(x)         (((paddr_t)(x)) >> PAGE_SHIFT)
  199 #define ptoa(x)         ((vaddr_t)((vaddr_t)(x) << PAGE_SHIFT))
  200 
  201 /*
  202  * Round off or truncate to the nearest page.  These will work
  203  * for either addresses or counts (i.e., 1 byte rounds to 1 page).
  204  */
  205 #define round_page(x)   (((x) + PAGE_MASK) & ~PAGE_MASK)
  206 #define trunc_page(x)   ((x) & ~PAGE_MASK)
  207 
  208 /*
  209  * Set up the default mapping address (VM_DEFAULT_ADDRESS) according to:
  210  *
  211  * USE_TOPDOWN_VM:      a kernel option to enable on a per-kernel basis
  212  *                      which only be used on ports that define...
  213  * __HAVE_TOPDOWN_VM:   a per-port option to offer the topdown option
  214  *
  215  * __USE_TOPDOWN_VM:    a per-port option to unconditionally use it
  216  *
  217  * if __USE_TOPDOWN_VM is defined, the port can specify a default vm
  218  * address, or we will use the topdown default from below.  If it is
  219  * NOT defined, then the port can offer topdown as an option, but it
  220  * MUST define the VM_DEFAULT_ADDRESS macro itself.
  221  */
  222 #if defined(USE_TOPDOWN_VM) || defined(__USE_TOPDOWN_VM)
  223 # if !defined(__HAVE_TOPDOWN_VM) && !defined(__USE_TOPDOWN_VM)
  224 #  error "Top down memory allocation not enabled for this system"
  225 # else /* !__HAVE_TOPDOWN_VM && !__USE_TOPDOWN_VM */
  226 #  define __USING_TOPDOWN_VM
  227 #  if !defined(VM_DEFAULT_ADDRESS)
  228 #   if !defined(__USE_TOPDOWN_VM)
  229 #    error "Top down memory allocation not configured for this system"
  230 #   else /* !__USE_TOPDOWN_VM */
  231 #    define VM_DEFAULT_ADDRESS(da, sz) \
  232         trunc_page(VM_MAXUSER_ADDRESS - MAXSSIZ - (sz))
  233 #   endif /* !__USE_TOPDOWN_VM */
  234 #  endif /* !VM_DEFAULT_ADDRESS */
  235 # endif /* !__HAVE_TOPDOWN_VM && !__USE_TOPDOWN_VM */
  236 #endif /* USE_TOPDOWN_VM || __USE_TOPDOWN_VM */
  237 
  238 #if !defined(__USING_TOPDOWN_VM)
  239 # if defined(VM_DEFAULT_ADDRESS)
  240 #  error "Default vm address should not be defined here"
  241 # else /* VM_DEFAULT_ADDRESS */
  242 #  define VM_DEFAULT_ADDRESS(da, sz) round_page((vaddr_t)(da) + (vsize_t)maxdmap)
  243 # endif /* VM_DEFAULT_ADDRESS */
  244 #endif /* !__USING_TOPDOWN_VM */
  245 
  246 extern int              ubc_nwins;      /* number of UBC mapping windows */
  247 extern int              ubc_winshift;   /* shift for a UBC mapping window */
  248 
  249 #else
  250 /* out-of-kernel versions of round_page and trunc_page */
  251 #define round_page(x) \
  252         ((((vaddr_t)(x) + (vm_page_size - 1)) / vm_page_size) * \
  253             vm_page_size)
  254 #define trunc_page(x) \
  255         ((((vaddr_t)(x)) / vm_page_size) * vm_page_size)
  256 
  257 #endif /* _KERNEL */
  258 #endif /* ASSEMBLER */
  259 #endif /* _VM_PARAM_ */

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