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vmparam.h revision 1.1 
      1 /*	$NetBSD: vmparam.h,v 1.1 2002/06/05 01:04:23 fredette Exp $	*/
      2 
      3 /*	$OpenBSD: vmparam.h,v 1.17 2001/09/22 18:00:09 miod Exp $	*/
      4 
      5 /*
      6  * Copyright (c) 1988-1994, The University of Utah and
      7  * the Computer Systems Laboratory at the University of Utah (CSL).
      8  * All rights reserved.
      9  *
     10  * Permission to use, copy, modify and distribute this software is hereby
     11  * granted provided that (1) source code retains these copyright, permission,
     12  * and disclaimer notices, and (2) redistributions including binaries
     13  * reproduce the notices in supporting documentation, and (3) all advertising
     14  * materials mentioning features or use of this software display the following
     15  * acknowledgement: ``This product includes software developed by the
     16  * Computer Systems Laboratory at the University of Utah.''
     17  *
     18  * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
     19  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
     20  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     21  *
     22  * CSL requests users of this software to return to csl-dist (at) cs.utah.edu any
     23  * improvements that they make and grant CSL redistribution rights.
     24  *
     25  * 	Utah $Hdr: vmparam.h 1.16 94/12/16$
     26  */
     27 
     28 #ifndef _HPPA_VMPARAM_H_
     29 #define _HPPA_VMPARAM_H_
     30 
     31 /*
     32  * Machine dependent constants for HP PA
     33  */
     34 /*
     35  * USRTEXT is the start of the user text/data space, while USRSTACK
     36  * is the top (end) of the user stack.  LOWPAGES and HIGHPAGES are
     37  * the number of pages from the beginning of the P0 region to the
     38  * beginning of the text and from the beginning of the P1 region to the
     39  * beginning of the stack respectively.
     40  */
     41 #define	USRTEXT		0x00002000		/* Start of user .text */
     42 #define	USRSTACK	0x68FF3000		/* Start of user stack */
     43 #define	LOWPAGES	0
     44 #define	HIGHPAGES	UPAGES
     45 #define	SYSCALLGATE	0xC0000000		/* syscall gateway page */
     46 
     47 #define	__HAVE_PMAP_PHYSSEG
     48 
     49 /* Alignment requirement for a uspace. */
     50 #define	USPACE_ALIGN	NBPG
     51 
     52 /*
     53  * Virtual memory related constants, all in bytes
     54  */
     55 #ifndef MAXTSIZ
     56 #define	MAXTSIZ		(0x40000000)		/* max text size */
     57 #endif
     58 #ifndef DFLDSIZ
     59 #define	DFLDSIZ		(16*1024*1024)		/* initial data size limit */
     60 #endif
     61 #ifndef MAXDSIZ
     62 #define	MAXDSIZ		(USRSTACK-MAXTSIZ)	/* max data size */
     63 #endif
     64 #ifndef	DFLSSIZ
     65 #define	DFLSSIZ		(512*1024)		/* initial stack size limit */
     66 #endif
     67 #ifndef	MAXSSIZ
     68 #define	MAXSSIZ		(UADDR-USRSTACK)	/* max stack size */
     69 #endif
     70 
     71 #ifndef USRIOSIZE
     72 #define	USRIOSIZE	((2*HPPA_PGALIAS)/PAGE_SIZE)	/* 2mb */
     73 #endif
     74 
     75 /*
     76  * PTEs for system V style shared memory.
     77  * This is basically slop for kmempt which we actually allocate (malloc) from.
     78  */
     79 #ifndef SHMMAXPGS
     80 #define SHMMAXPGS	((1024*1024*10)/NBPG)	/* 10mb */
     81 #endif
     82 
     83 /*
     84  * The time for a process to be blocked before being very swappable.
     85  * This is a number of seconds which the system takes as being a non-trivial
     86  * amount of real time.  You probably shouldn't change this;
     87  * it is used in subtle ways (fractions and multiples of it are, that is, like
     88  * half of a ``long time'', almost a long time, etc.)
     89  * It is related to human patience and other factors which don't really
     90  * change over time.
     91  */
     92 #define	MAXSLP 		20
     93 
     94 /* user/kernel map constants */
     95 #define	VM_MIN_ADDRESS		((vaddr_t)0)
     96 #define	VM_MAXUSER_ADDRESS	((vaddr_t)0xc0000000)
     97 #define	VM_MAX_ADDRESS		VM_MAXUSER_ADDRESS
     98 #define	VM_MIN_KERNEL_ADDRESS	((vaddr_t)0)
     99 #define	VM_MAX_KERNEL_ADDRESS	((vaddr_t)0xf0000000)
    100 
    101 /* virtual sizes (bytes) for various kernel submaps */
    102 #define VM_PHYS_SIZE		(USRIOSIZE*PAGE_SIZE)
    103 
    104 #define	VM_PHYSSEG_MAX	8	/* this many physmem segments */
    105 #define	VM_PHYSSEG_STRAT	VM_PSTRAT_BIGFIRST
    106 
    107 #define	VM_PHYSSEG_NOADD	/* XXX until uvm code is fixed */
    108 
    109 #define	VM_NFREELIST		2
    110 #define	VM_FREELIST_DEFAULT	0
    111 #define	VM_FREELIST_FIRST16	1
    112 
    113 #ifdef _KERNEL
    114 struct pmap_physseg {
    115 	int pmap_table_off;
    116 };
    117 #endif
    118 
    119 #endif	/* _HPPA_VMPARAM_H_ */
    120 
    121