vmparam.h revision 1.8 
1/*	$NetBSD: vmparam.h,v 1.8 2001/11/15 18:06:15 soren 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 _NEWS68K_VMPARAM_H_
46#define	_NEWS68K_VMPARAM_H_
47
48/*
49 * Machine dependent constants for news68k
50 */
51
52/*
53 * We use 4K pages on the news68k.  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		(16*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 * Mach derived constants
123 */
124
125/* user/kernel map constants */
126#define VM_MIN_ADDRESS		((vaddr_t)0)
127#define VM_MAXUSER_ADDRESS	((vaddr_t)0xFFF00000)
128#define VM_MAX_ADDRESS		((vaddr_t)0xFFF00000)
129#define VM_MIN_KERNEL_ADDRESS	((vaddr_t)0)
130#define VM_MAX_KERNEL_ADDRESS	((vaddr_t)0xFFFFF000)
131
132/* virtual sizes (bytes) for various kernel submaps */
133#define VM_PHYS_SIZE		(USRIOSIZE*NBPG)
134
135/* # of kernel PT pages (initial only, can grow dynamically) */
136#define VM_KERNEL_PT_PAGES	((vsize_t)2)		/* XXX: SYSPTSIZE */
137
138/*
139 * Constants which control the way the VM system deals with memory segments.
140 * The news68k only has one physical memory segment?
141 */
142#define	VM_PHYSSEG_MAX		1
143#define	VM_PHYSSEG_STRAT	VM_PSTRAT_BSEARCH
144#define	VM_PHYSSEG_NOADD
145
146#define	VM_NFREELIST		1
147#define	VM_FREELIST_DEFAULT	0
148
149#define	__HAVE_PMAP_PHYSSEG
150
151/*
152 * pmap-specific data stored in the vm_physmem[] array.
153 */
154struct pmap_physseg {
155	struct pv_entry *pvent;		/* pv table for this seg */
156	char *attrs;			/* page attributes for this seg */
157};
158
159#endif /* _NEWS68K_VMPARAM_H_ */
160