sys/arch/vax/include/vmparam.h

   1 /*      $NetBSD: vmparam.h,v 1.44 2008/03/11 05:34:02 matt Exp $        */
   2
   3 /*-
   4  * Copyright (c) 1990 The Regents of the University of California.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * William Jolitz.
   9  *
  10  * Slightly modified for the VAX port /IC
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      @(#)vmparam.h   5.9 (Berkeley) 5/12/91
  37  */
  38 #ifndef _VMPARAM_H_
  39 #define _VMPARAM_H_
  40
  41 /*
  42  * Machine dependent constants for VAX.
  43  */
  44
  45 /*
  46  * We use 4K VM pages on the VAX.  Override the PAGE_* definitions
  47  * to be compile-time constants.
  48  */
  49 #define PAGE_SHIFT      12
  50 #define PAGE_SIZE       (1 << PAGE_SHIFT)
  51 #define PAGE_MASK       (PAGE_SIZE - 1)
  52
  53 /*
  54  * USRSTACK is the top (end) of the user stack. Immediately above the
  55  * user stack resides kernel.
  56  */
  57
  58 #define USRSTACK        KERNBASE
  59
  60 /*
  61  * Virtual memory related constants, all in bytes
  62  */
  63
  64 #ifndef MAXTSIZ
  65 #define MAXTSIZ         (8*1024*1024)           /* max text size */
  66 #endif
  67 #ifndef DFLDSIZ
  68 #define DFLDSIZ         (128*1024*1024)         /* initial data size limit */
  69 #endif
  70 #ifndef MAXDSIZ
  71 #define MAXDSIZ         (1024*1024*1024)        /* max data size */
  72 #endif
  73 #ifndef DFLSSIZ
  74 #define DFLSSIZ         (512*1024)              /* initial stack size limit */
  75 #endif
  76 #ifndef MAXSSIZ
  77 #define MAXSSIZ         (8*1024*1024)           /* max stack size */
  78 #endif
  79
  80 #define VM_PHYSSEG_MAX          1
  81 #define VM_PHYSSEG_NOADD
  82 #define VM_PHYSSEG_STRAT        VM_PSTRAT_BSEARCH /* XXX */
  83
  84 #define VM_NFREELIST            1
  85 #define VM_FREELIST_DEFAULT     0
  86
  87 /* MD round macros */
  88 #define vax_round_page(x) (((vaddr_t)(x) + VAX_PGOFSET) & ~VAX_PGOFSET)
  89 #define vax_trunc_page(x) ((vaddr_t)(x) & ~VAX_PGOFSET)
  90
  91 /*
  92  * Mach derived constants
  93  */
  94
  95 /* user/kernel map constants */
  96 #define VM_MIN_ADDRESS          ((vaddr_t)0)
  97 #define VM_MAXUSER_ADDRESS      ((vaddr_t)KERNBASE)
  98 #define VM_MAX_ADDRESS          ((vaddr_t)KERNBASE)
  99 #define VM_MIN_KERNEL_ADDRESS   ((vaddr_t)KERNBASE)
 100 #define VM_MAX_KERNEL_ADDRESS   ((vaddr_t)(0xC0000000))
 101
 102 /*
 103  * The address to which unspecified mapping requests default
 104  */
 105 #define __USE_TOPDOWN_VM
 106 #define VM_DEFAULT_ADDRESS(da, sz) \
 107         trunc_page(VM_MAXUSER_ADDRESS - MAXSSIZ - (sz))
 108
 109 #define USRIOSIZE               (8 * VAX_NPTEPG)        /* 512MB */
 110 #define VM_PHYS_SIZE            (USRIOSIZE*VAX_NBPG)
 111
 112 #if 0
 113 #define __HAVE_VM_PAGE_MD
 114
 115 struct vm_page_md {
 116         unsigned int md_attrs;
 117 };
 118
 119 #define VM_MDPAGE_INIT(pg)      ((pg)->mdpage.md_attrs = 0)
 120 #endif
 121
 122
 123 #endif