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vmparam.h revision 1.41 
      1 /*	$NetBSD: vmparam.h,v 1.41 2003/08/07 16:30:13 agc 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 #if USE_TOPDOWN_VM==1
     68 #ifndef DFLDSIZ
     69 #define DFLDSIZ		(128*1024*1024)		/* initial data size limit */
     70 #endif
     71 #ifndef MAXDSIZ
     72 #define MAXDSIZ		(1024*1024*1024)	/* max data size */
     73 #endif
     74 #else
     75 #ifndef DFLDSIZ
     76 #define DFLDSIZ		(32*1024*1024)		/* initial data size limit */
     77 #endif
     78 #ifndef MAXDSIZ
     79 #define MAXDSIZ		(64*1024*1024)		/* max data size */
     80 #endif
     81 #endif
     82 #ifndef DFLSSIZ
     83 #define DFLSSIZ		(512*1024)		/* initial stack size limit */
     84 #endif
     85 #ifndef MAXSSIZ
     86 #define MAXSSIZ		(8*1024*1024)		/* max stack size */
     87 #endif
     88 
     89 #ifndef USE_TOPDOWN_VM
     90 /*
     91  * All mmap()'ed data will be mapped above MAXDSIZ. This means that
     92  * pte space must be allocated for (possible) mmap()'ed data.
     93  * Note: This is just a hint, if we mmap() more than this the page
     94  * table will be expanded. (at the cost of speed).
     95  */
     96 #define MMAPSPACE	(8*1024*1024)
     97 #endif
     98 
     99 /*
    100  * Size of shared memory map
    101  */
    102 
    103 #ifndef SHMMAXPGS
    104 #define SHMMAXPGS	1024
    105 #endif
    106 
    107 #define VM_PHYSSEG_MAX		1
    108 #define VM_PHYSSEG_NOADD
    109 #define VM_PHYSSEG_STRAT	VM_PSTRAT_BSEARCH /* XXX */
    110 
    111 #define	VM_NFREELIST		1
    112 #define	VM_FREELIST_DEFAULT	0
    113 
    114 /* MD round macros */
    115 #define	vax_round_page(x) (((vaddr_t)(x) + VAX_PGOFSET) & ~VAX_PGOFSET)
    116 #define	vax_trunc_page(x) ((vaddr_t)(x) & ~VAX_PGOFSET)
    117 
    118 /*
    119  * Mach derived constants
    120  */
    121 
    122 /* user/kernel map constants */
    123 #define VM_MIN_ADDRESS		((vaddr_t)0)
    124 #define VM_MAXUSER_ADDRESS	((vaddr_t)KERNBASE)
    125 #define VM_MAX_ADDRESS		((vaddr_t)KERNBASE)
    126 #define VM_MIN_KERNEL_ADDRESS	((vaddr_t)KERNBASE)
    127 #define VM_MAX_KERNEL_ADDRESS	((vaddr_t)(0xC0000000))
    128 
    129 /*
    130  * The address to which unspecified mapping requests default
    131  */
    132 #define __HAVE_TOPDOWN_VM
    133 #ifdef USE_TOPDOWN_VM
    134 #define VM_DEFAULT_ADDRESS(da, sz) \
    135 	trunc_page(VM_MAXUSER_ADDRESS - MAXSSIZ - (sz))
    136 #endif
    137 
    138 #define	USRIOSIZE		(8 * VAX_NPTEPG)	/* 512MB */
    139 #define	VM_PHYS_SIZE		(USRIOSIZE*VAX_NBPG)
    140 
    141 #endif
    142