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

     /*      $NetBSD: vmparam.h,v 1.26 2003/08/07 16:27:47 agc Exp $ */
     
     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1988 The Regents of the University of California.
      * All rights reserved.
      *
      * 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.
     *
     * $FreeBSD$
     */
    
    #ifndef _MACHINE_VMPARAM_H_
    #define _MACHINE_VMPARAM_H_
    
    /*
     * Machine dependent constants for ARM.
     */
    
    /*
     * Virtual memory related constants, all in bytes
     */
    #ifndef MAXTSIZ
    #define MAXTSIZ         (256UL*1024*1024)       /* max text size */
    #endif
    #ifndef DFLDSIZ
    #define DFLDSIZ         (128UL*1024*1024)       /* initial data size limit */
    #endif
    #ifndef MAXDSIZ
    #define MAXDSIZ         (512UL*1024*1024)       /* max data size */
    #endif
    #ifndef DFLSSIZ
    #define DFLSSIZ         (4UL*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
    
    /*
     * Address space constants
     */
    
    /*
     * The line between user space and kernel space
     * Mappings >= KERNEL_BASE are constant across all processes
     */
    #ifndef KERNBASE
    #define KERNBASE                0xc0000000
    #endif
    
    /*
     * The virtual address the kernel is linked to run at.  For armv4/5 platforms
     * the low-order 30 bits of this must match the low-order bits of the physical
     * address the kernel is loaded at, so the value is most often provided as a
     * kernel config option in the std.platform file. For armv6/7 the kernel can
     * be loaded at any 2MB boundary, and KERNVIRTADDR can also be set to any 2MB
     * boundary.  It is typically overridden in the std.platform file only when
     * KERNBASE is also set to a lower address to provide more KVA.
     */
    #ifndef KERNVIRTADDR
    #define KERNVIRTADDR            0xc0000000
    #endif
    
    /*
     * max number of non-contig chunks of physical RAM you can have
     */
    
    #define VM_PHYSSEG_MAX          32
    
    /*
     * The physical address space may be sparsely populated on some ARM systems.
     */
    #define VM_PHYSSEG_SPARSE
   
   /*
    * Create one free page pool.  Since the ARM kernel virtual address
    * space does not include a mapping onto the machine's entire physical
    * memory, VM_FREEPOOL_DIRECT is defined as an alias for the default
    * pool, VM_FREEPOOL_DEFAULT.
    */
   #define VM_NFREEPOOL            1
   #define VM_FREEPOOL_DEFAULT     0
   #define VM_FREEPOOL_DIRECT      0
   
   /*
    * We need just one free list:  DEFAULT.
    */
   #define VM_NFREELIST            1
   #define VM_FREELIST_DEFAULT     0
   
   /*
    * The largest allocation size is 1MB.
    */
   #define VM_NFREEORDER           9
   
   /*
    * Enable superpage reservations: 1 level.
    */
   #ifndef VM_NRESERVLEVEL
   #define VM_NRESERVLEVEL         1
   #endif
   
   /*
    * Level 0 reservations consist of 256 pages.
    */
   #ifndef VM_LEVEL_0_ORDER
   #define VM_LEVEL_0_ORDER        8
   #endif
   
   #define VM_MIN_ADDRESS          (0x00001000)
   #ifndef VM_MAXUSER_ADDRESS
   #define VM_MAXUSER_ADDRESS      (KERNBASE - 0x00400000) /* !!! PT2MAP_SIZE */
   #endif
   #define VM_MAX_ADDRESS          VM_MAXUSER_ADDRESS
   
   #define SHAREDPAGE              (VM_MAXUSER_ADDRESS - PAGE_SIZE)
   #define USRSTACK                SHAREDPAGE
   
   /* initial pagein size of beginning of executable file */
   #ifndef VM_INITIAL_PAGEIN
   #define VM_INITIAL_PAGEIN       16
   #endif
   
   #ifndef VM_MIN_KERNEL_ADDRESS
   #define VM_MIN_KERNEL_ADDRESS KERNBASE
   #endif
   
   #define VM_MAX_KERNEL_ADDRESS   (vm_max_kernel_address)
   
   /*
    * How many physical pages per kmem arena virtual page.
    */
   #ifndef VM_KMEM_SIZE_SCALE
   #define VM_KMEM_SIZE_SCALE      (3)
   #endif
   
   /*
    * Optional floor (in bytes) on the size of the kmem arena.
    */
   #ifndef VM_KMEM_SIZE_MIN
   #define VM_KMEM_SIZE_MIN        (12 * 1024 * 1024)
   #endif
   
   /*
    * Optional ceiling (in bytes) on the size of the kmem arena: 40% of the
    * kernel map.
    */
   #ifndef VM_KMEM_SIZE_MAX
   #define VM_KMEM_SIZE_MAX        ((vm_max_kernel_address - \
       VM_MIN_KERNEL_ADDRESS + 1) * 2 / 5)
   #endif
   
   extern vm_offset_t vm_max_kernel_address;
   
   #define ZERO_REGION_SIZE        (64 * 1024)     /* 64KB */
   
   #ifndef VM_MAX_AUTOTUNE_MAXUSERS
   #define VM_MAX_AUTOTUNE_MAXUSERS        384
   #endif
   
   #define SFBUF
   #define SFBUF_MAP
   
   #define PMAP_HAS_DMAP   0
   #define PHYS_TO_DMAP(x) ({ panic("No direct map exists"); 0; })
   #define DMAP_TO_PHYS(x) ({ panic("No direct map exists"); 0; })
   
   #define DEVMAP_MAX_VADDR        ARM_VECTORS_HIGH
   
   /*
    * No non-transparent large page support in the pmap.
    */
   #define PMAP_HAS_LARGEPAGES     0
   
   /*
    * Need a page dump array for minidump.
    */
   #define MINIDUMP_PAGE_TRACKING  1
   
   #endif  /* _MACHINE_VMPARAM_H_ */

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