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vmparam.h revision 1.32 
      1 /*	$NetBSD: vmparam.h,v 1.32 2000/03/07 00:05:59 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. All advertising materials mentioning features or use of this software
     21  *    must display the following acknowledgement:
     22  *	This product includes software developed by the University of
     23  *	California, Berkeley and its contributors.
     24  * 4. Neither the name of the University nor the names of its contributors
     25  *    may be used to endorse or promote products derived from this software
     26  *    without specific prior written permission.
     27  *
     28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     38  * SUCH DAMAGE.
     39  *
     40  *	@(#)vmparam.h	5.9 (Berkeley) 5/12/91
     41  */
     42 #ifndef _VMPARAM_H_
     43 #define _VMPARAM_H_
     44 
     45 /*
     46  * Machine dependent constants for VAX.
     47  */
     48 
     49 /*
     50  * USRTEXT is the start of the user text/data space, while USRSTACK
     51  * is the top (end) of the user stack. Immediately above the user stack
     52  * resides kernel.
     53  *
     54  */
     55 
     56 #define USRTEXT		NBPG
     57 #define USRSTACK	KERNBASE
     58 
     59 /*
     60  * Virtual memory related constants, all in bytes
     61  */
     62 
     63 #ifndef MAXTSIZ
     64 #define MAXTSIZ		(8*1024*1024)		/* max text size */
     65 #endif
     66 #ifndef MAXDSIZ
     67 #define MAXDSIZ		(24*1024*1024)		/* max data size */
     68 #endif
     69 #ifndef MAXSSIZ
     70 #define MAXSSIZ		(8*1024*1024)		/* max stack size */
     71 #endif
     72 #ifndef DFLDSIZ
     73 #define DFLDSIZ		(16*1024*1024)		/* initial data size limit */
     74 #endif
     75 #ifndef DFLSSIZ
     76 #define DFLSSIZ		(512*1024)		/* initial stack size limit */
     77 #endif
     78 
     79 /*
     80  * All mmap()'ed data will be mapped above MAXDSIZ. This means that
     81  * pte space must be allocated for (possible) mmap()'ed data.
     82  * Note: This is just a hint, if we mmap() more than this the page
     83  * table will be expanded. (at the cost of speed).
     84  */
     85 #define MMAPSPACE	(8*1024*1024)
     86 
     87 /*
     88  * Size of shared memory map
     89  */
     90 
     91 #ifndef SHMMAXPGS
     92 #define SHMMAXPGS	64		/* XXXX should be 1024 */
     93 #endif
     94 
     95 /*
     96  * The time for a process to be blocked before being very swappable.
     97  * This is a number of seconds which the system takes as being a non-trivial
     98  * amount of real time.	 You probably shouldn't change this;
     99  * it is used in subtle ways (fractions and multiples of it are, that is, like
    100  * half of a ``long time'', almost a long time, etc.)
    101  * It is related to human patience and other factors which don't really
    102  * change over time.
    103  */
    104 
    105 #define MAXSLP		20
    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 struct pmap_physseg {
    115 	int	dummy;
    116 };
    117 
    118 /* MD round macros */
    119 #define	vax_round_page(x) (((vaddr_t)(x) + VAX_PGOFSET) & ~VAX_PGOFSET)
    120 #define	vax_trunc_page(x) ((vaddr_t)(x) & ~VAX_PGOFSET)
    121 
    122 /*
    123  * Mach derived constants
    124  */
    125 
    126 /* user/kernel map constants */
    127 #define VM_MIN_ADDRESS		((vaddr_t)0)
    128 #define VM_MAXUSER_ADDRESS	((vaddr_t)KERNBASE)
    129 #define VM_MAX_ADDRESS		((vaddr_t)KERNBASE)
    130 #define VM_MIN_KERNEL_ADDRESS	((vaddr_t)KERNBASE)
    131 #define VM_MAX_KERNEL_ADDRESS	((vaddr_t)(0xC0000000))
    132 
    133 #define	USRIOSIZE		(8 * VAX_NPTEPG)	/* 512MB */
    134 #define	VM_PHYS_SIZE		(USRIOSIZE*VAX_NBPG)
    135 
    136 #endif
    137