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

     /*      $NetBSD: uvm_param.h,v 1.41 2020/07/23 19:07:01 skrll 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_modular.h"
    #include "opt_uvm.h"
    #endif
    #ifdef _KERNEL
    #include <sys/types.h>
    #include <machine/vmparam.h>
    #include <sys/resourcevar.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 modules.
    */
   #if (MIN_PAGE_SIZE != MAX_PAGE_SIZE)
   #define __uvmexp_pagesize
   #if defined(_MODULE)
   #undef PAGE_SIZE
   #undef PAGE_MASK
   #undef PAGE_SHIFT
   #endif
   #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)
   extern const int *const uvmexp_pagesize;
   extern const int *const uvmexp_pagemask;
   extern const int *const uvmexp_pageshift;
   #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_MINADDRESS   14
   #define VM_MAXADDRESS   15
   #define VM_PROC         16              /* process information */
   #define VM_GUARD_SIZE   17              /* guard size for main thread */
   #define VM_THREAD_GUARD_SIZE    18      /* default guard size for new threads */
   
   #define VM_PROC_MAP     1               /* struct kinfo_vmentry */
   
   #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)         (((paddr_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)
   
   #ifndef VM_DEFAULT_ADDRESS_BOTTOMUP
   #define VM_DEFAULT_ADDRESS_BOTTOMUP(da, sz) \
       round_page((vaddr_t)(da) + (vsize_t)maxdmap)
   #endif
   
   extern unsigned int user_stack_guard_size;
   extern unsigned int user_thread_stack_guard_size;
   #ifndef VM_DEFAULT_ADDRESS_TOPDOWN
   #define VM_DEFAULT_ADDRESS_TOPDOWN(da, sz) \
       trunc_page(VM_MAXUSER_ADDRESS - MAXSSIZ - (sz) - user_stack_guard_size)
   #endif
   
   extern int              ubc_nwins;      /* number of UBC mapping windows */
   extern const 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 */
   
   /*
    * typedefs, necessary for standard UVM headers.
    */
   
   typedef unsigned int uvm_flag_t;
   
   typedef int vm_inherit_t;       /* XXX: inheritance codes */
   typedef off_t voff_t;           /* XXX: offset within a uvm_object */
   typedef voff_t pgoff_t;         /* XXX: number of pages within a uvm object */
   
   #endif /* ASSEMBLER */
   #endif /* _VM_PARAM_ */

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