FreeBSD/Linux Kernel Cross Reference
sys/mips/include/vmparam.h

     /*      $OpenBSD: vmparam.h,v 1.2 1998/09/15 10:50:12 pefo Exp $        */
     /*      $NetBSD: vmparam.h,v 1.5 1994/10/26 21:10:10 cgd Exp $  */
     
     /*
      * Copyright (c) 1988 University of Utah.
      * Copyright (c) 1992, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
     * the Systems Programming Group of the University of Utah Computer
     * Science Department and Ralph Campbell.
     *
     * 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.
     * 4. 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.
     *
     *      from: Utah Hdr: vmparam.h 1.16 91/01/18
     *      @(#)vmparam.h   8.2 (Berkeley) 4/22/94
     *      JNPR: vmparam.h,v 1.3.2.1 2007/09/10 06:01:28 girish
     * $FreeBSD: releng/8.3/sys/mips/include/vmparam.h 215938 2010-11-27 12:26:40Z jchandra $
     */
    
    #ifndef _MACHINE_VMPARAM_H_
    #define _MACHINE_VMPARAM_H_
    
    /*
     * Machine dependent constants mips processors.
     */
    /*
     * USRTEXT is the start of the user text/data space, while USRSTACK
     * is the top (end) of the user stack.
     */
    #define USRTEXT         (1*PAGE_SIZE)
    
    /*
     * Virtual memory related constants, all in bytes
     */
    #ifndef MAXTSIZ
    #define MAXTSIZ         (128UL*1024*1024)       /* max text size */
    #endif
    #ifndef DFLDSIZ
    #define DFLDSIZ         (128UL*1024*1024)       /* initial data size limit */
    #endif
    #ifndef MAXDSIZ
    #define MAXDSIZ         (1*1024UL*1024*1024)    /* max data size */
    #endif
    #ifndef DFLSSIZ
    #define DFLSSIZ         (8UL*1024*1024)         /* initial stack size limit */
    #endif
    #ifndef MAXSSIZ
    #define MAXSSIZ         (64UL*1024*1024)        /* max stack size */
    #endif
    #ifndef SGROWSIZ
    #define SGROWSIZ        (128UL*1024)            /* amount to grow stack */
    #endif
    
    /* 
     * The time for a process to be blocked before being very swappable.
     * This is a number of seconds which the system takes as being a non-trivial
     * amount of real time.  You probably shouldn't change this;
     * it is used in subtle ways (fractions and multiples of it are, that is, like
     * half of a ``long time'', almost a long time, etc.)
     * It is related to human patience and other factors which don't really
     * change over time.
     */
    #define MAXSLP          20
    
    /*
     * Mach derived constants
     */
    
    /* user/kernel map constants */
    #define VM_MIN_ADDRESS          ((vm_offset_t)0x00000000)
    #define VM_MAX_ADDRESS          ((vm_offset_t)(intptr_t)(int32_t)0xffffffff)
    
    #define VM_MINUSER_ADDRESS      ((vm_offset_t)0x00000000)
    #define VM_MAX_MMAP_ADDR        VM_MAXUSER_ADDRESS
    
    #ifdef __mips_n64
   #define VM_MAXUSER_ADDRESS      (VM_MINUSER_ADDRESS + (NPDEPG * NBSEG))
   #define VM_MIN_KERNEL_ADDRESS   ((vm_offset_t)0xc000000000000000)
   #define VM_MAX_KERNEL_ADDRESS   (VM_MIN_KERNEL_ADDRESS + (NPDEPG * NBSEG))
   #else
   #define VM_MAXUSER_ADDRESS      ((vm_offset_t)0x80000000)
   #define VM_MIN_KERNEL_ADDRESS   ((vm_offset_t)0xC0000000)
   #define VM_MAX_KERNEL_ADDRESS   ((vm_offset_t)0xFFFFC000)
   #endif
   
   #define KERNBASE                ((vm_offset_t)(intptr_t)(int32_t)0x80000000)
   /*
    * USRSTACK needs to start a little below 0x8000000 because the R8000
    * and some QED CPUs perform some virtual address checks before the
    * offset is calculated.
    */
   #define USRSTACK                (VM_MAXUSER_ADDRESS - PAGE_SIZE)
    
   /*
    * Only one memory domain.
    */
   #ifndef VM_NDOMAIN
   #define VM_NDOMAIN              1
   #endif
   
   /*
    * Disable superpage reservations. (not sure if this is right
    * I copied it from ARM)
    */
   #ifndef VM_NRESERVLEVEL
   #define VM_NRESERVLEVEL         0
   #endif
   
   /* virtual sizes (bytes) for various kernel submaps */
   #ifndef VM_KMEM_SIZE
   #define VM_KMEM_SIZE            (12 * 1024 * 1024)
   #endif
   
   /*
    * How many physical pages per KVA page allocated.
    * min(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE), VM_KMEM_SIZE_MAX)
    * is the total KVA space allocated for kmem_map.
    */
   #ifndef VM_KMEM_SIZE_SCALE
   #define VM_KMEM_SIZE_SCALE      (3)
   #endif
   
   /*
    * Ceiling on amount of kmem_map kva space.
    */
   #ifndef VM_KMEM_SIZE_MAX
   #define VM_KMEM_SIZE_MAX        (200 * 1024 * 1024)
   #endif
   
   /* initial pagein size of beginning of executable file */
   #ifndef VM_INITIAL_PAGEIN
   #define VM_INITIAL_PAGEIN       16
   #endif
   
   /*
    * max number of non-contig chunks of physical RAM you can have
    */
   #define VM_PHYSSEG_MAX          32
   
   /*
    * The physical address space is sparsely populated.
    */
   #define VM_PHYSSEG_SPARSE
   
   /*
    * Create three free page pools: VM_FREEPOOL_DEFAULT is the default pool
    * from which physical pages are allocated and VM_FREEPOOL_DIRECT is
    * the pool from which physical pages for small UMA objects are
    * allocated.
    */
   #define VM_NFREEPOOL            3
   #define VM_FREEPOOL_CACHE       2
   #define VM_FREEPOOL_DEFAULT     0
   #define VM_FREEPOOL_DIRECT      1
   
   /*
    * we support 2 free lists:
    *
    *      - DEFAULT for direct mapped (KSEG0) pages.
    *        Note: This usage of DEFAULT may be misleading because we use
    *        DEFAULT for allocating direct mapped pages. The normal page
    *        allocations use HIGHMEM if available, and then DEFAULT. 
    *      - HIGHMEM for other pages 
    */
   #ifdef __mips_n64
   #define VM_NFREELIST            1
   #define VM_FREELIST_DEFAULT     0
   #define VM_FREELIST_DIRECT      VM_FREELIST_DEFAULT
   #else
   #define VM_NFREELIST            2
   #define VM_FREELIST_DEFAULT     1
   #define VM_FREELIST_HIGHMEM     0
   #define VM_FREELIST_DIRECT      VM_FREELIST_DEFAULT
   #define VM_HIGHMEM_ADDRESS      ((vm_paddr_t)0x20000000)
   #endif
   
   /*
    * The largest allocation size is 1MB.
    */
   #define VM_NFREEORDER           9
   
   #endif /* !_MACHINE_VMPARAM_H_ */

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