xref: /netbsd-src/sys/arch/sun2/include/vmparam.h (revision b8c616269f5ebf18ab2e35cb8099d683130a177c)
1 /*	$NetBSD: vmparam.h,v 1.8 2002/12/10 05:14:35 thorpej Exp $	*/
2 
3 /*-
4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. All advertising materials mentioning features or use of this software
16  *    must display the following acknowledgement:
17  *        This product includes software developed by the NetBSD
18  *        Foundation, Inc. and its contributors.
19  * 4. Neither the name of The NetBSD Foundation nor the names of its
20  *    contributors may be used to endorse or promote products derived
21  *    from this software without specific prior written permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
24  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
25  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
26  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
27  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33  * POSSIBILITY OF SUCH DAMAGE.
34  */
35 
36 /*
37  * Machine dependent constants for Sun2
38  *
39  * The Sun2 has limited total kernel virtual space (14MB) and
40  * can not use main memory for page tables.  (All active PTEs
41  * must be installed in special translation RAM in the MMU).
42  * Therefore, parameters that would normally configure the
43  * size of various page tables are irrelevant.  Only things
44  * that consume portions of kernel virtual (KV) space matter,
45  * and those things should be chosen to conserve KV space.
46  */
47 
48 /*
49  * We definitely need a small pager map.
50  */
51 #undef	PAGER_MAP_SIZE
52 #define	PAGER_MAP_SIZE (1 * 1024 * 1024)
53 
54 /*
55  * USRSTACK is the top (end) of the user stack.
56  */
57 #define	USRSTACK	0x1000000	/* High end of user stack */
58 
59 /*
60  * Virtual memory related constants, all in bytes.
61  * The Sun2 has only 16 MB of user-virtual space,
62  * so we need to be conservative with these limits.
63  */
64 #ifndef MAXTSIZ
65 #define	MAXTSIZ		(5*1024*1024)		/* max text size */
66 #endif
67 #ifndef DFLDSIZ
68 #define	DFLDSIZ		(4*1024*1024)		/* initial data size limit */
69 #endif
70 #ifndef MAXDSIZ
71 #define	MAXDSIZ		(6*1024*1024)		/* max data size */
72 #endif
73 #ifndef	DFLSSIZ
74 #define	DFLSSIZ		(512*1024)		/* initial stack size limit */
75 #endif
76 #ifndef	MAXSSIZ
77 #define	MAXSSIZ		(4*1024*1024)		/* max stack size */
78 #endif
79 
80 /*
81  * PTEs for mapping user space into the kernel for phyio operations.
82  * The actual limitation for physio requests will be the DVMA space,
83  * and that is fixed by hardware design at 256K.  We could make the
84  * physio map larger than that, but it would not buy us much.
85  */
86 #ifndef USRIOSIZE
87 #define USRIOSIZE	128		/* 256K */
88 #endif
89 
90 /*
91  * PTEs for system V style shared memory.
92  * This is basically slop for kmempt which we actually allocate (malloc) from.
93  */
94 #ifndef SHMMAXPGS
95 #define SHMMAXPGS	512 	/* 4 MB */
96 #endif
97 
98 /*
99  * Mach-derived constants:
100  */
101 
102 /* user/kernel map constants */
103 #define VM_MIN_ADDRESS		((vaddr_t)0)
104 #define VM_MAX_ADDRESS		((vaddr_t)USRSTACK)
105 #define VM_MAXUSER_ADDRESS	((vaddr_t)USRSTACK)
106 #define VM_MIN_KERNEL_ADDRESS	((vaddr_t)KERNBASE)
107 #define VM_MAX_KERNEL_ADDRESS	((vaddr_t)KERN_END)
108 
109 /* virtual sizes (bytes) for various kernel submaps */
110 #define VM_PHYS_SIZE		(USRIOSIZE*NBPG)
111 
112 #define VM_PHYSSEG_STRAT	VM_PSTRAT_BSEARCH
113 #define VM_PHYSSEG_NOADD	/* can't add RAM after vm_mem_init */
114 
115 #define	VM_NFREELIST		1
116 #define	VM_FREELIST_DEFAULT	0
117 
118 #ifdef	_LKM
119 #undef	KERNBASE
120 extern	char KERNBASE[];
121 #endif	/* _LKM */
122 
123 /* This is needed by some LKMs. */
124 #define VM_PHYSSEG_MAX		4
125