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vmparam.h revision 1.44 
      1 /*	$NetBSD: vmparam.h,v 1.44 2001/10/20 00:17:47 fvdl 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  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  *
     38  *	@(#)vmparam.h	5.9 (Berkeley) 5/12/91
     39  */
     40 
     41 #ifndef _VMPARAM_H_
     42 #define _VMPARAM_H_
     43 
     44 /*
     45  * Machine dependent constants for 386.
     46  */
     47 
     48 /*
     49  * Page size on the IA-32 is not variable in the traditional sense.
     50  * We override the PAGE_* definitions to compile-time constants.
     51  */
     52 #define	PAGE_SHIFT	12
     53 #define	PAGE_SIZE	(1 << PAGE_SHIFT)
     54 #define	PAGE_MASK	(PAGE_SIZE - 1)
     55 
     56 /*
     57  * Virtual address space arrangement. On 386, both user and kernel
     58  * share the address space, not unlike the vax.
     59  * USRTEXT is the start of the user text/data space, while USRSTACK
     60  * is the top (end) of the user stack. Immediately above the user stack
     61  * resides the user structure, which is UPAGES long and contains the
     62  * kernel stack.
     63  *
     64  * Immediately after the user structure is the page table map, and then
     65  * kernal address space.
     66  */
     67 #define	USRTEXT		NBPG
     68 #define	USRSTACK	VM_MAXUSER_ADDRESS
     69 
     70 /*
     71  * Virtual memory related constants, all in bytes
     72  */
     73 #define	MAXTSIZ		(64*1024*1024)		/* max text size */
     74 #ifndef DFLDSIZ
     75 #define	DFLDSIZ		(128*1024*1024)		/* initial data size limit */
     76 #endif
     77 #ifndef MAXDSIZ
     78 #define	MAXDSIZ		(1*1024*1024*1024)	/* max data size */
     79 #endif
     80 #ifndef	DFLSSIZ
     81 #define	DFLSSIZ		(2*1024*1024)		/* initial stack size limit */
     82 #endif
     83 #ifndef	MAXSSIZ
     84 #define	MAXSSIZ		(32*1024*1024)		/* max stack size */
     85 #endif
     86 
     87 /*
     88  * Size of shared memory map
     89  */
     90 #ifndef SHMMAXPGS
     91 #define SHMMAXPGS	2048
     92 #endif
     93 
     94 /*
     95  * Size of User Raw I/O map
     96  */
     97 #define	USRIOSIZE 	300
     98 
     99 /*
    100  * The time for a process to be blocked before being very swappable.
    101  * This is a number of seconds which the system takes as being a non-trivial
    102  * amount of real time.  You probably shouldn't change this;
    103  * it is used in subtle ways (fractions and multiples of it are, that is, like
    104  * half of a ``long time'', almost a long time, etc.)
    105  * It is related to human patience and other factors which don't really
    106  * change over time.
    107  */
    108 #define	MAXSLP 		20
    109 
    110 /*
    111  * Mach derived constants
    112  */
    113 
    114 /* user/kernel map constants */
    115 #define VM_MIN_ADDRESS		((vaddr_t)0)
    116 #define	VM_MAXUSER_ADDRESS	\
    117 			((vaddr_t)((PDSLOT_PTE << PDSHIFT) - (UPAGES * NBPG)))
    118 #define	VM_MAX_ADDRESS		\
    119 		((vaddr_t)((PDSLOT_PTE << PDSHIFT) + (PDSLOT_PTE << PGSHIFT)))
    120 #define	VM_MIN_KERNEL_ADDRESS	((vaddr_t)(PDSLOT_KERN << PDSHIFT))
    121 #define	VM_MAX_KERNEL_ADDRESS	((vaddr_t)(PDSLOT_APTE << PDSHIFT))
    122 
    123 /* XXX max. amount of KVM to be used by buffers. */
    124 #ifndef VM_MAX_KERNEL_BUF
    125 #define VM_MAX_KERNEL_BUF	(384 * 1024 * 1024)
    126 #endif
    127 
    128 /* virtual sizes (bytes) for various kernel submaps */
    129 #define VM_PHYS_SIZE		(USRIOSIZE*NBPG)
    130 
    131 #define VM_PHYSSEG_MAX		5	/* 1 "hole" + 4 free lists */
    132 #define VM_PHYSSEG_STRAT	VM_PSTRAT_BIGFIRST
    133 #define VM_PHYSSEG_NOADD		/* can't add RAM after vm_mem_init */
    134 
    135 #define	VM_NFREELIST		2
    136 #define	VM_FREELIST_DEFAULT	0
    137 #define	VM_FREELIST_FIRST16	1
    138 
    139 #define	__HAVE_PMAP_PHYSSEG
    140 
    141 /*
    142  * pmap specific data stored in the vm_physmem[] array
    143  */
    144 struct pmap_physseg {
    145 	struct pv_head *pvhead;		/* pv_head array */
    146 	char *attrs;			/* attrs array */
    147 };
    148 
    149 #endif /* _VMPARAM_H_ */
    150