xref: /netbsd-src/sys/arch/news68k/include/vmparam.h (revision 6a493d6bc668897c91594964a732d38505b70cbb)
1 /*	$NetBSD: vmparam.h,v 1.19 2011/11/20 15:38:00 tsutsui 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. Neither the name of the University nor the names of its contributors
21  *    may be used to endorse or promote products derived from this software
22  *    without specific prior written permission.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34  * SUCH DAMAGE.
35  *
36  * from: Utah $Hdr: vmparam.h 1.16 91/01/18$
37  *
38  *	@(#)vmparam.h	8.2 (Berkeley) 4/19/94
39  */
40 
41 #ifndef _NEWS68K_VMPARAM_H_
42 #define	_NEWS68K_VMPARAM_H_
43 
44 /*
45  * Machine dependent constants for news68k
46  */
47 
48 /*
49  * We use 4K pages on the news68k.  Override the PAGE_* definitions
50  * to be compile time constants.
51  */
52 #define	PAGE_SHIFT	PGSHIFT
53 #define	PAGE_SIZE	(1 << PAGE_SHIFT)
54 #define	PAGE_MASK	(PAGE_SIZE - 1)
55 
56 /*
57  * USRSTACK is the top (end) of the user stack.
58  *
59  * NOTE: the ONLY reason that HIGHPAGES is 0x100 instead of UPAGES (3)
60  * is for HPUX compatibility.  Why??  Because HPUX's debuggers
61  * have the user's stack hard-wired at FFF00000 for post-mortems,
62  * and we must be compatible...
63  */
64 #define	USRSTACK	(-HIGHPAGES*PAGE_SIZE)	/* Start of user stack */
65 #define	BTOPUSRSTACK	(0x100000-HIGHPAGES)	/* btop(USRSTACK) */
66 #define P1PAGES		0x100000
67 #define HIGHPAGES	(0x100000/PAGE_SIZE)
68 
69 /*
70  * Virtual memory related constants, all in bytes
71  */
72 #ifndef MAXTSIZ
73 #define	MAXTSIZ		(8*1024*1024)		/* max text size */
74 #endif
75 #ifndef DFLDSIZ
76 #define	DFLDSIZ		(16*1024*1024)		/* initial data size limit */
77 #endif
78 #ifndef MAXDSIZ
79 #define	MAXDSIZ		(64*1024*1024)		/* max data size */
80 #endif
81 #ifndef	DFLSSIZ
82 #define	DFLSSIZ		(512*1024)		/* initial stack size limit */
83 #endif
84 #ifndef	MAXSSIZ
85 #define	MAXSSIZ		MAXDSIZ			/* max stack size */
86 #endif
87 
88 /*
89  * Sizes of the system and user portions of the system page table.
90  */
91 /* SYSPTSIZE IS SILLY; IT SHOULD BE COMPUTED AT BOOT TIME */
92 #define	SYSPTSIZE	(2 * NPTEPG)	/* 8mb */
93 #define	USRPTSIZE 	(1 * NPTEPG)	/* 4mb */
94 
95 /*
96  * PTEs for mapping user space into the kernel for phyio operations.
97  * One page is enough to handle 4Mb of simultaneous raw IO operations.
98  */
99 #ifndef USRIOSIZE
100 #define USRIOSIZE	(1 * NPTEPG)	/* 4mb */
101 #endif
102 
103 /*
104  * Mach derived constants
105  */
106 
107 /* user/kernel map constants */
108 #define VM_MIN_ADDRESS		((vaddr_t)0)
109 #define VM_MAXUSER_ADDRESS	((vaddr_t)0xFFF00000)
110 #define VM_MAX_ADDRESS		((vaddr_t)0xFFF00000)
111 #define VM_MIN_KERNEL_ADDRESS	((vaddr_t)0)
112 #define VM_MAX_KERNEL_ADDRESS	((vaddr_t)(0xC0000000-PAGE_SIZE*NPTEPG))
113 
114 /* virtual sizes (bytes) for various kernel submaps */
115 #define VM_PHYS_SIZE		(USRIOSIZE*PAGE_SIZE)
116 
117 /* # of kernel PT pages (initial only, can grow dynamically) */
118 #define VM_KERNEL_PT_PAGES	((vsize_t)2)		/* XXX: SYSPTSIZE */
119 
120 /*
121  * Constants which control the way the VM system deals with memory segments.
122  * The news68k only has one physical memory segment?
123  */
124 #define	VM_PHYSSEG_MAX		1
125 #define	VM_PHYSSEG_STRAT	VM_PSTRAT_BSEARCH
126 
127 #define	VM_NFREELIST		1
128 #define	VM_FREELIST_DEFAULT	0
129 
130 #define	__HAVE_PMAP_PHYSSEG
131 
132 /*
133  * pmap-specific data stored in the vm_physmem[] array.
134  */
135 struct pmap_physseg {
136 	struct pv_header *pvheader;	/* pv table for this seg */
137 };
138 
139 #endif /* _NEWS68K_VMPARAM_H_ */
140