Home | History | Annotate | Line # | Download | only in include
vmparam.h revision 1.14.8.3 
      1 /* $NetBSD: vmparam.h,v 1.14.8.3 2001/04/21 17:53:05 bouyer Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1988 University of Utah.
      5  * Copyright (c) 1992, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * the Systems Programming Group of the University of Utah Computer
     10  * Science Department and Ralph Campbell.
     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  * from: Utah $Hdr: vmparam.h 1.16 91/01/18$
     41  *
     42  *	@(#)vmparam.h	8.2 (Berkeley) 4/22/94
     43  */
     44 
     45 #ifndef	_ALPHA_VMPARAM_H_
     46 #define	_ALPHA_VMPARAM_H_
     47 
     48 /*
     49  * Machine dependent constants for Alpha.
     50  */
     51 
     52 /*
     53  * USRTEXT is the start of the user text/data space, while USRSTACK
     54  * is the top (end) of the user stack.
     55  *
     56  * Digital UNIX (formerly DEC OSF/1) places the stack below the
     57  * text segment (i.e. growing downward from 4G).  We may want to
     58  * consider doing that at some point, but it might require changes
     59  * to the exec code.
     60  */
     61 #define	USRTEXT		NBPG
     62 #define	USRSTACK	((vaddr_t)0x0000000200000000)		/* 8G */
     63 
     64 /*
     65  * Virtual memory related constants, all in bytes
     66  */
     67 #ifndef MAXTSIZ
     68 #define	MAXTSIZ		(1<<30)			/* max text size (1G) */
     69 #endif
     70 #ifndef DFLDSIZ
     71 #define	DFLDSIZ		(1<<27)			/* initial data size (128M) */
     72 #endif
     73 #ifndef MAXDSIZ
     74 #define	MAXDSIZ		(1<<30)			/* max data size (1G) */
     75 #endif
     76 #ifndef	DFLSSIZ
     77 #define	DFLSSIZ		(1<<21)			/* initial stack size (2M) */
     78 #endif
     79 #ifndef	MAXSSIZ
     80 #define	MAXSSIZ		(1<<25)			/* max stack size (32M) */
     81 #endif
     82 
     83 /*
     84  * PTEs for mapping user space into the kernel for phyio operations.
     85  * 64 pte's are enough to cover 8 disks * MAXBSIZE.
     86  */
     87 #ifndef USRIOSIZE
     88 #define USRIOSIZE	64
     89 #endif
     90 
     91 /*
     92  * PTEs for system V style shared memory.
     93  * This is basically slop for kmempt which we actually allocate (malloc) from.
     94  */
     95 #ifndef SHMMAXPGS
     96 #define SHMMAXPGS	1024		/* 8mb */
     97 #endif
     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)ALPHA_USEG_BASE)	    /* 0 */
    116 #define VM_MAXUSER_ADDRESS	((vaddr_t)(ALPHA_USEG_END + 1L))    /* 4T */
    117 #define VM_MAX_ADDRESS		VM_MAXUSER_ADDRESS
    118 #define VM_MIN_KERNEL_ADDRESS	((vaddr_t)ALPHA_K1SEG_BASE)
    119 #define VM_MAX_KERNEL_ADDRESS	trunc_page((vaddr_t)ALPHA_K1SEG_END)
    120 
    121 /* virtual sizes (bytes) for various kernel submaps */
    122 #define VM_PHYS_SIZE		(USRIOSIZE*NBPG)
    123 
    124 /* some Alpha-specific constants */
    125 #define	VPTBASE		((vaddr_t)0xfffffffc00000000)	/* Virt. pg table */
    126 
    127 #define	VM_PHYSSEG_MAX		16		/* XXX */
    128 #define	VM_PHYSSEG_STRAT	VM_PSTRAT_BSEARCH
    129 #define	VM_PHYSSEG_NOADD			/* no more after vm_mem_init */
    130 
    131 #define	VM_NFREELIST		1
    132 #define	VM_FREELIST_DEFAULT	0
    133 
    134 /*
    135  * pmap-specific data stored in the vm_physmem[] array.
    136  */
    137 struct pmap_physseg {
    138 	struct pv_head *pvhead;		/* pv list of this seg */
    139 };
    140 
    141 #endif	/* ! _ALPHA_VMPARAM_H_ */
    142