FreeBSD/Linux Kernel Cross Reference
sys/amd64/include/vmparam.h

     /*-
      * Copyright (c) 1990 The Regents of the University of California.
      * All rights reserved.
      * Copyright (c) 1994 John S. Dyson
      * All rights reserved.
      * Copyright (c) 2003 Peter Wemm
      * All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
     * William Jolitz.
     *
     * 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 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: @(#)vmparam.h     5.9 (Berkeley) 5/12/91
     * $FreeBSD: releng/9.0/sys/amd64/include/vmparam.h 221855 2011-05-13 19:35:01Z mdf $
     */
    
    
    #ifndef _MACHINE_VMPARAM_H_
    #define _MACHINE_VMPARAM_H_ 1
    
    /*
     * Machine dependent constants for AMD64.
     */
    
    /*
     * Virtual memory related constants, all in bytes
     */
    #define MAXTSIZ         (128UL*1024*1024)       /* max text size */
    #ifndef DFLDSIZ
    #define DFLDSIZ         (128UL*1024*1024)       /* initial data size limit */
    #endif
    #ifndef MAXDSIZ
    #define MAXDSIZ         (32768UL*1024*1024)     /* max data size */
    #endif
    #ifndef DFLSSIZ
    #define DFLSSIZ         (8UL*1024*1024)         /* initial stack size limit */
    #endif
    #ifndef MAXSSIZ
    #define MAXSSIZ         (512UL*1024*1024)       /* max stack size */
    #endif
    #ifndef SGROWSIZ
    #define SGROWSIZ        (128UL*1024)            /* amount to grow stack */
    #endif
    
    /*
     * We provide a machine specific single page allocator through the use
     * of the direct mapped segment.  This uses 2MB pages for reduced
     * TLB pressure.
     */
    #define UMA_MD_SMALL_ALLOC
    
    /*
     * The physical address space is densely populated.
     */
    #define VM_PHYSSEG_DENSE
    
    /*
     * The number of PHYSSEG entries must be one greater than the number
     * of phys_avail entries because the phys_avail entry that spans the
     * largest physical address that is accessible by ISA DMA is split
     * into two PHYSSEG entries. 
     */
    #define VM_PHYSSEG_MAX          31
    
    /*
     * 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 page tables and small UMA
     * objects are allocated.
     */
    #define VM_NFREEPOOL            3
    #define VM_FREEPOOL_CACHE       2
   #define VM_FREEPOOL_DEFAULT     0
   #define VM_FREEPOOL_DIRECT      1
   
   /*
    * Create two free page lists: VM_FREELIST_DEFAULT is for physical
    * pages that are above the largest physical address that is
    * accessible by ISA DMA and VM_FREELIST_ISADMA is for physical pages
    * that are below that address.
    */
   #define VM_NFREELIST            2
   #define VM_FREELIST_DEFAULT     0
   #define VM_FREELIST_ISADMA      1
   
   /*
    * An allocation size of 16MB is supported in order to optimize the
    * use of the direct map by UMA.  Specifically, a cache line contains
    * at most 8 PDEs, collectively mapping 16MB of physical memory.  By
    * reducing the number of distinct 16MB "pages" that are used by UMA,
    * the physical memory allocator reduces the likelihood of both 2MB
    * page TLB misses and cache misses caused by 2MB page TLB misses.
    */
   #define VM_NFREEORDER           13
   
   /*
    * Only one memory domain.
    */
   #ifndef VM_NDOMAIN
   #define VM_NDOMAIN              1
   #endif
   
   /*
    * Enable superpage reservations: 1 level.
    */
   #ifndef VM_NRESERVLEVEL
   #define VM_NRESERVLEVEL         1
   #endif
   
   /*
    * Level 0 reservations consist of 512 pages.
    */
   #ifndef VM_LEVEL_0_ORDER
   #define VM_LEVEL_0_ORDER        9
   #endif
   
   #ifdef  SMP
   #define PA_LOCK_COUNT   256
   #endif
   
   /*
    * Virtual addresses of things.  Derived from the page directory and
    * page table indexes from pmap.h for precision.
    *
    * 0x0000000000000000 - 0x00007fffffffffff   user map
    * 0x0000800000000000 - 0xffff7fffffffffff   does not exist (hole)
    * 0xffff800000000000 - 0xffff804020100fff   recursive page table (512GB slot)
    * 0xffff804020101000 - 0xfffffdffffffffff   unused
    * 0xfffffe0000000000 - 0xfffffeffffffffff   1TB direct map
    * 0xffffff0000000000 - 0xffffff7fffffffff   unused
    * 0xffffff8000000000 - 0xffffffffffffffff   512GB kernel map
    *
    * Within the kernel map:
    *
    * 0xffffffff80000000                        KERNBASE
    */
   
   #define VM_MAX_KERNEL_ADDRESS   KVADDR(KPML4I, NPDPEPG-1, NPDEPG-1, NPTEPG-1)
   #define VM_MIN_KERNEL_ADDRESS   KVADDR(KPML4I, NPDPEPG-512, 0, 0)
   
   #define DMAP_MIN_ADDRESS        KVADDR(DMPML4I, 0, 0, 0)
   #define DMAP_MAX_ADDRESS        KVADDR(DMPML4I + NDMPML4E, 0, 0, 0)
   
   #define KERNBASE                KVADDR(KPML4I, KPDPI, 0, 0)
   
   #define UPT_MAX_ADDRESS         KVADDR(PML4PML4I, PML4PML4I, PML4PML4I, PML4PML4I)
   #define UPT_MIN_ADDRESS         KVADDR(PML4PML4I, 0, 0, 0)
   
   #define VM_MAXUSER_ADDRESS      UVADDR(NUPML4E, 0, 0, 0)
   
   #define SHAREDPAGE              (VM_MAXUSER_ADDRESS - PAGE_SIZE)
   #define USRSTACK                SHAREDPAGE
   
   #define VM_MAX_ADDRESS          UPT_MAX_ADDRESS
   #define VM_MIN_ADDRESS          (0)
   
   #define PHYS_TO_DMAP(x)         ((x) | DMAP_MIN_ADDRESS)
   #define DMAP_TO_PHYS(x)         ((x) & ~DMAP_MIN_ADDRESS)
   
   /* 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(max(VM_KMEM_SIZE, Physical memory/VM_KMEM_SIZE_SCALE),
    *     VM_KMEM_SIZE_MIN), VM_KMEM_SIZE_MAX)
    * is the total KVA space allocated for kmem_map.
    */
   #ifndef VM_KMEM_SIZE_SCALE
   #define VM_KMEM_SIZE_SCALE      (1)
   #endif
   
   /*
    * Ceiling on amount of kmem_map kva space.
    */
   #ifndef VM_KMEM_SIZE_MAX
   #define VM_KMEM_SIZE_MAX        ((VM_MAX_KERNEL_ADDRESS - \
       VM_MIN_KERNEL_ADDRESS + 1) * 3 / 5)
   #endif
   
   /* initial pagein size of beginning of executable file */
   #ifndef VM_INITIAL_PAGEIN
   #define VM_INITIAL_PAGEIN       16
   #endif
   
   #define ZERO_REGION_SIZE        (2 * 1024 * 1024)       /* 2MB */
   
   #endif /* _MACHINE_VMPARAM_H_ */

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