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vmparam.h revision 1.18 
      1 /* $NetBSD: vmparam.h,v 1.18 2000/05/22 17:13:54 thorpej 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.  Immediately above the user stack
     55  * resides the user structure, which is UPAGES long and contains the
     56  * kernel stack.
     57  *
     58  * Digital UNIX (formerly DEC OSF/1) places the stack below the
     59  * text segment (i.e. growing downward from 4G).  We may want to
     60  * consider doing that at some point, but it might require changes
     61  * to the exec code.
     62  */
     63 #define	USRTEXT		NBPG
     64 #define	USRSTACK	((vaddr_t)0x0000000200000000)		/* 8G */
     65 
     66 /*
     67  * Virtual memory related constants, all in bytes
     68  */
     69 #ifndef MAXTSIZ
     70 #define	MAXTSIZ		(1<<30)			/* max text size (1G) */
     71 #endif
     72 #ifndef DFLDSIZ
     73 #define	DFLDSIZ		(1<<27)			/* initial data size (128M) */
     74 #endif
     75 #ifndef MAXDSIZ
     76 #define	MAXDSIZ		(1<<30)			/* max data size (1G) */
     77 #endif
     78 #ifndef	DFLSSIZ
     79 #define	DFLSSIZ		(1<<21)			/* initial stack size (2M) */
     80 #endif
     81 #ifndef	MAXSSIZ
     82 #define	MAXSSIZ		(1<<25)			/* max stack size (32M) */
     83 #endif
     84 
     85 /*
     86  * PTEs for mapping user space into the kernel for phyio operations.
     87  * 64 pte's are enough to cover 8 disks * MAXBSIZE.
     88  */
     89 #ifndef USRIOSIZE
     90 #define USRIOSIZE	64
     91 #endif
     92 
     93 /*
     94  * PTEs for system V style shared memory.
     95  * This is basically slop for kmempt which we actually allocate (malloc) from.
     96  */
     97 #ifndef SHMMAXPGS
     98 #define SHMMAXPGS	1024		/* 8mb */
     99 #endif
    100 
    101 /*
    102  * The time for a process to be blocked before being very swappable.
    103  * This is a number of seconds which the system takes as being a non-trivial
    104  * amount of real time.  You probably shouldn't change this;
    105  * it is used in subtle ways (fractions and multiples of it are, that is, like
    106  * half of a ``long time'', almost a long time, etc.)
    107  * It is related to human patience and other factors which don't really
    108  * change over time.
    109  */
    110 #define	MAXSLP 		20
    111 
    112 /*
    113  * Mach derived constants
    114  */
    115 
    116 /* user/kernel map constants */
    117 #define VM_MIN_ADDRESS		((vaddr_t)ALPHA_USEG_BASE)	    /* 0 */
    118 #define VM_MAXUSER_ADDRESS	((vaddr_t)(ALPHA_USEG_END + 1L))    /* 4T */
    119 #define VM_MAX_ADDRESS		VM_MAXUSER_ADDRESS
    120 #define VM_MIN_KERNEL_ADDRESS	((vaddr_t)ALPHA_K1SEG_BASE)
    121 #define VM_MAX_KERNEL_ADDRESS	((vaddr_t)ALPHA_K1SEG_END)
    122 
    123 /* virtual sizes (bytes) for various kernel submaps */
    124 #define VM_PHYS_SIZE		(USRIOSIZE*NBPG)
    125 
    126 /* some Alpha-specific constants */
    127 #define	VPTBASE		((vaddr_t)0xfffffffc00000000)	/* Virt. pg table */
    128 
    129 #define	VM_PHYSSEG_MAX		16		/* XXX */
    130 #define	VM_PHYSSEG_STRAT	VM_PSTRAT_BSEARCH
    131 #define	VM_PHYSSEG_NOADD			/* no more after vm_mem_init */
    132 
    133 #define	VM_NFREELIST		1
    134 #define	VM_FREELIST_DEFAULT	0
    135 
    136 /*
    137  * pmap-specific data stored in the vm_physmem[] array.
    138  */
    139 struct pmap_physseg {
    140 	struct pv_head *pvhead;		/* pv list of this seg */
    141 };
    142 
    143 #endif	/* ! _ALPHA_VMPARAM_H_ */
    144