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vmparam.h revision 1.24 
      1 /*	$NetBSD: vmparam.h,v 1.24 2000/12/12 23:46:22 simonb Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988 University of Utah.
      5  * Copyright (c) 1982, 1986, 1990, 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.
     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) 4/19/94
     43  */
     44 
     45 #ifndef _HP300_VMPARAM_H_
     46 #define	_HP300_VMPARAM_H_
     47 
     48 /*
     49  * Machine dependent constants for HP300
     50  */
     51 
     52 /*
     53  * We use 4K pages on the hp300.  Override the PAGE_* definitions
     54  * to be compile-time constants.
     55  */
     56 #define	PAGE_SHIFT	12
     57 #define	PAGE_SIZE	(1 << PAGE_SHIFT)
     58 #define	PAGE_MASK	(PAGE_SIZE - 1)
     59 
     60 /*
     61  * USRTEXT is the start of the user text/data space, while USRSTACK
     62  * is the top (end) of the user stack.  LOWPAGES and HIGHPAGES are
     63  * the number of pages from the beginning of the P0 region to the
     64  * beginning of the text and from the beginning of the P1 region to the
     65  * beginning of the stack respectively.
     66  *
     67  * NOTE: the ONLY reason that HIGHPAGES is 0x100 instead of UPAGES (3)
     68  * is for HPUX compatibility.  Why??  Because HPUX's debuggers
     69  * have the user's stack hard-wired at FFF00000 for post-mortems,
     70  * and we must be compatible...
     71  */
     72 #define	USRTEXT		8192			/* Must equal __LDPGSZ */
     73 #define	USRSTACK	(-HIGHPAGES*NBPG)	/* Start of user stack */
     74 #define	BTOPUSRSTACK	(0x100000-HIGHPAGES)	/* btop(USRSTACK) */
     75 #define P1PAGES		0x100000
     76 #define	LOWPAGES	0
     77 #define HIGHPAGES	(0x100000/NBPG)
     78 
     79 /*
     80  * Virtual memory related constants, all in bytes
     81  */
     82 #ifndef MAXTSIZ
     83 #define	MAXTSIZ		(8*1024*1024)		/* max text size */
     84 #endif
     85 #ifndef DFLDSIZ
     86 #define	DFLDSIZ		(32*1024*1024)		/* initial data size limit */
     87 #endif
     88 #ifndef MAXDSIZ
     89 #define	MAXDSIZ		(64*1024*1024)		/* max data size */
     90 #endif
     91 #ifndef	DFLSSIZ
     92 #define	DFLSSIZ		(512*1024)		/* initial stack size limit */
     93 #endif
     94 #ifndef	MAXSSIZ
     95 #define	MAXSSIZ		MAXDSIZ			/* max stack size */
     96 #endif
     97 
     98 /*
     99  * Sizes of the system and user portions of the system page table.
    100  */
    101 /* SYSPTSIZE IS SILLY; IT SHOULD BE COMPUTED AT BOOT TIME */
    102 #define	SYSPTSIZE	(2 * NPTEPG)	/* 8mb */
    103 #define	USRPTSIZE 	(1 * NPTEPG)	/* 4mb */
    104 
    105 /*
    106  * PTEs for mapping user space into the kernel for phyio operations.
    107  * One page is enough to handle 4Mb of simultaneous raw IO operations.
    108  */
    109 #ifndef USRIOSIZE
    110 #define USRIOSIZE	(1 * NPTEPG)	/* 4mb */
    111 #endif
    112 
    113 /*
    114  * PTEs for system V style shared memory.
    115  * This is basically slop for kmempt which we actually allocate (malloc) from.
    116  */
    117 #ifndef SHMMAXPGS
    118 #define SHMMAXPGS	1024		/* 4mb */
    119 #endif
    120 
    121 /*
    122  * External IO space map size.
    123  * By default we make it large enough to map up to 3 DIO-II devices and
    124  * the complete DIO space.  For a 320-only configuration (which has no
    125  * DIO-II) you could define a considerably smaller region.
    126  */
    127 #ifndef EIOMAPSIZE
    128 #define EIOMAPSIZE	3584		/* 14mb */
    129 #endif
    130 
    131 /*
    132  * The time for a process to be blocked before being very swappable.
    133  * This is a number of seconds which the system takes as being a non-trivial
    134  * amount of real time.  You probably shouldn't change this;
    135  * it is used in subtle ways (fractions and multiples of it are, that is, like
    136  * half of a ``long time'', almost a long time, etc.)
    137  * It is related to human patience and other factors which don't really
    138  * change over time.
    139  */
    140 #define	MAXSLP 		20
    141 
    142 /*
    143  * Mach derived constants
    144  */
    145 
    146 /* user/kernel map constants */
    147 #define VM_MIN_ADDRESS		((vaddr_t)0)
    148 #define VM_MAXUSER_ADDRESS	((vaddr_t)0xFFF00000)
    149 #define VM_MAX_ADDRESS		((vaddr_t)0xFFF00000)
    150 #define VM_MIN_KERNEL_ADDRESS	((vaddr_t)0)
    151 #define VM_MAX_KERNEL_ADDRESS	((vaddr_t)0xFFFFF000)
    152 
    153 /* virtual sizes (bytes) for various kernel submaps */
    154 #define VM_PHYS_SIZE		(USRIOSIZE*NBPG)
    155 
    156 /* # of kernel PT pages (initial only, can grow dynamically) */
    157 #define VM_KERNEL_PT_PAGES	((vsize_t)2)		/* XXX: SYSPTSIZE */
    158 
    159 /*
    160  * Constants which control the way the VM system deals with memory segments.
    161  * The hp300 only has one physical memory segment.
    162  */
    163 #define	VM_PHYSSEG_MAX		1
    164 #define	VM_PHYSSEG_STRAT	VM_PSTRAT_BSEARCH
    165 #define	VM_PHYSSEG_NOADD
    166 
    167 #define	VM_NFREELIST		1
    168 #define	VM_FREELIST_DEFAULT	0
    169 
    170 /*
    171  * pmap-specific data stored in the vm_physmem[] array.
    172  */
    173 struct pmap_physseg {
    174 	struct pv_entry *pvent;		/* pv table for this seg */
    175 	char *attrs;			/* page attributes for this seg */
    176 };
    177 
    178 #endif /* _HP300_VMPARAM_H_ */
    179