FreeBSD/Linux Kernel Cross Reference
sys/uvm/uvm_param.h

     /*      $NetBSD: uvm_param.h,v 1.18 2003/08/07 16:34:50 agc Exp $       */
     
     /*
      * Copyright (c) 1991, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * The Mach Operating System project at Carnegie-Mellon University.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)vm_param.h  8.2 (Berkeley) 1/9/95
     *
     *
     * Copyright (c) 1987, 1990 Carnegie-Mellon University.
     * All rights reserved.
     *
     * Authors: Avadis Tevanian, Jr., Michael Wayne Young
     *
     * Permission to use, copy, modify and distribute this software and
     * its documentation is hereby granted, provided that both the copyright
     * notice and this permission notice appear in all copies of the
     * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     *
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     *
     * Carnegie Mellon requests users of this software to return to
     *
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     *
     * any improvements or extensions that they make and grant Carnegie the
     * rights to redistribute these changes.
     */
    
    /*
     *      Machine independent virtual memory parameters.
     */
    
    #ifndef _VM_PARAM_
    #define _VM_PARAM_
    
    #ifdef _KERNEL_OPT
    #include "opt_uvm.h"
    #endif
    #ifdef _KERNEL
    #include <machine/vmparam.h>
    #endif
    
    #if defined(_KERNEL)
    
    #if defined(PAGE_SIZE)
    
    /*
     * If PAGE_SIZE is defined at this stage, it must be a constant.
     */
    
    #if PAGE_SIZE == 0
    #error Invalid PAGE_SIZE definition
    #endif
    
    /*
     * If the platform does not need to support a variable PAGE_SIZE,
     * then provide default values for MIN_PAGE_SIZE and MAX_PAGE_SIZE.
     */
    
    #if !defined(MIN_PAGE_SIZE)
    #define MIN_PAGE_SIZE   PAGE_SIZE
    #endif /* ! MIN_PAGE_SIZE */
    
    #if !defined(MAX_PAGE_SIZE)
    #define MAX_PAGE_SIZE   PAGE_SIZE
   #endif /* ! MAX_PAGE_SIZE */
   
   #else /* ! PAGE_SIZE */
   
   /*
    * PAGE_SIZE is not a constant; MIN_PAGE_SIZE and MAX_PAGE_SIZE must
    * be defined.
    */
   
   #if !defined(MIN_PAGE_SIZE)
   #error MIN_PAGE_SIZE not defined
   #endif
   
   #if !defined(MAX_PAGE_SIZE)
   #error MAX_PAGE_SIZE not defined
   #endif
   
   #endif /* PAGE_SIZE */
   
   /*
    * MIN_PAGE_SIZE and MAX_PAGE_SIZE must be constants.
    */
   
   #if MIN_PAGE_SIZE == 0
   #error Invalid MIN_PAGE_SIZE definition
   #endif
   
   #if MAX_PAGE_SIZE == 0
   #error Invalid MAX_PAGE_SIZE definition
   #endif
   
   /*
    * If MIN_PAGE_SIZE and MAX_PAGE_SIZE are not equal, then we must use
    * non-constant PAGE_SIZE, et al for LKMs.
    */
   #if (MIN_PAGE_SIZE != MAX_PAGE_SIZE) && defined(_LKM)
   #undef PAGE_SIZE
   #undef PAGE_MASK
   #undef PAGE_SHIFT
   #endif
   
   /*
    * Now provide PAGE_SIZE, PAGE_MASK, and PAGE_SHIFT if we do not
    * have ones that are compile-time constants.
    */
   #if !defined(PAGE_SIZE)
   #define PAGE_SIZE       uvmexp.pagesize         /* size of page */
   #define PAGE_MASK       uvmexp.pagemask         /* size of page - 1 */
   #define PAGE_SHIFT      uvmexp.pageshift        /* bits to shift for pages */
   #endif /* PAGE_SIZE */
   
   #endif /* _KERNEL */
   
   /*
    * CTL_VM identifiers
    */
   #define VM_METER        1               /* struct vmmeter */
   #define VM_LOADAVG      2               /* struct loadavg */
   #define VM_UVMEXP       3               /* struct uvmexp */
   #define VM_NKMEMPAGES   4               /* kmem_map pages */
   #define VM_UVMEXP2      5               /* struct uvmexp_sysctl */
   #define VM_ANONMIN      6
   #define VM_EXECMIN      7
   #define VM_FILEMIN      8
   #define VM_MAXSLP       9
   #define VM_USPACE       10
   #define VM_ANONMAX      11
   #define VM_EXECMAX      12
   #define VM_FILEMAX      13
   
   #define VM_MAXID        14              /* number of valid vm ids */
   
   #define CTL_VM_NAMES { \
           { 0, 0 }, \
           { "vmmeter", CTLTYPE_STRUCT }, \
           { "loadavg", CTLTYPE_STRUCT }, \
           { "uvmexp", CTLTYPE_STRUCT }, \
           { "nkmempages", CTLTYPE_INT }, \
           { "uvmexp2", CTLTYPE_STRUCT }, \
           { "anonmin", CTLTYPE_INT }, \
           { "execmin", CTLTYPE_INT }, \
           { "filemin", CTLTYPE_INT }, \
           { "maxslp", CTLTYPE_INT }, \
           { "uspace", CTLTYPE_INT }, \
           { "anonmax", CTLTYPE_INT }, \
           { "execmax", CTLTYPE_INT }, \
           { "filemax", CTLTYPE_INT }, \
   }
   
   #ifndef ASSEMBLER
   /*
    *      Convert addresses to pages and vice versa.
    *      No rounding is used.
    */
   #ifdef _KERNEL
   #define atop(x)         (((paddr_t)(x)) >> PAGE_SHIFT)
   #define ptoa(x)         ((vaddr_t)((vaddr_t)(x) << PAGE_SHIFT))
   
   /*
    * Round off or truncate to the nearest page.  These will work
    * for either addresses or counts (i.e., 1 byte rounds to 1 page).
    */
   #define round_page(x)   (((x) + PAGE_MASK) & ~PAGE_MASK)
   #define trunc_page(x)   ((x) & ~PAGE_MASK)
   
   /*
    * Set up the default mapping address (VM_DEFAULT_ADDRESS) according to:
    *
    * USE_TOPDOWN_VM:      a kernel option to enable on a per-kernel basis
    *                      which only be used on ports that define...
    * __HAVE_TOPDOWN_VM:   a per-port option to offer the topdown option
    *
    * __USE_TOPDOWN_VM:    a per-port option to unconditionally use it
    *
    * if __USE_TOPDOWN_VM is defined, the port can specify a default vm
    * address, or we will use the topdown default from below.  If it is
    * NOT defined, then the port can offer topdown as an option, but it
    * MUST define the VM_DEFAULT_ADDRESS macro itself.
    */
   #if defined(USE_TOPDOWN_VM) || defined(__USE_TOPDOWN_VM)
   # if !defined(__HAVE_TOPDOWN_VM) && !defined(__USE_TOPDOWN_VM)
   #  error "Top down memory allocation not enabled for this system"
   # else /* !__HAVE_TOPDOWN_VM && !__USE_TOPDOWN_VM */
   #  define __USING_TOPDOWN_VM
   #  if !defined(VM_DEFAULT_ADDRESS)
   #   if !defined(__USE_TOPDOWN_VM)
   #    error "Top down memory allocation not configured for this system"
   #   else /* !__USE_TOPDOWN_VM */
   #    define VM_DEFAULT_ADDRESS(da, sz) \
           trunc_page(VM_MAXUSER_ADDRESS - MAXSSIZ - (sz))
   #   endif /* !__USE_TOPDOWN_VM */
   #  endif /* !VM_DEFAULT_ADDRESS */
   # endif /* !__HAVE_TOPDOWN_VM && !__USE_TOPDOWN_VM */
   #endif /* USE_TOPDOWN_VM || __USE_TOPDOWN_VM */
   
   #if !defined(__USING_TOPDOWN_VM)
   # if defined(VM_DEFAULT_ADDRESS)
   #  error "Default vm address should not be defined here"
   # else /* VM_DEFAULT_ADDRESS */
   #  define VM_DEFAULT_ADDRESS(da, sz) round_page((vaddr_t)(da) + MAXDSIZ)
   # endif /* VM_DEFAULT_ADDRESS */
   #endif /* !__USING_TOPDOWN_VM */
   
   extern int              ubc_nwins;      /* number of UBC mapping windows */
   extern int              ubc_winshift;   /* shift for a UBC mapping window */
   
   #else
   /* out-of-kernel versions of round_page and trunc_page */
   #define round_page(x) \
           ((((vaddr_t)(x) + (vm_page_size - 1)) / vm_page_size) * \
               vm_page_size)
   #define trunc_page(x) \
           ((((vaddr_t)(x)) / vm_page_size) * vm_page_size)
   
   #endif /* _KERNEL */
   #endif /* ASSEMBLER */
   #endif /* _VM_PARAM_ */

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