xref: /netbsd-src/sys/arch/x68k/include/vmparam.h (revision 4472dbe5e3bd91ef2540bada7a7ca7384627ff9b)
1 /*	$NetBSD: vmparam.h,v 1.14 2000/02/11 19:30:30 thorpej 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 _X68K_VMPARAM_H_
46 #define	_X68K_VMPARAM_H_
47 
48 /*
49  * Machine dependent constants for X68K
50  */
51 /*
52  * USRTEXT is the start of the user text/data space, while USRSTACK
53  * is the top (end) of the user stack.  LOWPAGES and HIGHPAGES are
54  * the number of pages from the beginning of the P0 region to the
55  * beginning of the text and from the beginning of the P1 region to the
56  * beginning of the stack respectively.
57  */
58 #define	USRTEXT		8192			/* Must equal __LDPGSZ */
59 #define	USRSTACK	(-HIGHPAGES*NBPG)	/* Start of user stack */
60 #define	BTOPUSRSTACK	(0x100000-HIGHPAGES)	/* btop(USRSTACK) */
61 #define P1PAGES		0x100000
62 #define	LOWPAGES	0
63 #define HIGHPAGES	3			/* UPAGES */
64 
65 /*
66  * Virtual memory related constants, all in bytes
67  */
68 #ifndef MAXTSIZ
69 #define	MAXTSIZ		(8*1024*1024)		/* max text size */
70 #endif
71 #ifndef DFLDSIZ
72 #define	DFLDSIZ		(16*1024*1024)		/* initial data size limit */
73 #endif
74 #ifndef MAXDSIZ
75 #define	MAXDSIZ		(64*1024*1024)		/* max data size */
76 #endif
77 #ifndef	DFLSSIZ
78 #define	DFLSSIZ		(512*1024)		/* initial stack size limit */
79 #endif
80 #ifndef	MAXSSIZ
81 #define	MAXSSIZ		MAXDSIZ			/* max stack size */
82 #endif
83 
84 /*
85  * Sizes of the system and user portions of the system page table.
86  */
87 /* SYSPTSIZE IS SILLY; IT SHOULD BE COMPUTED AT BOOT TIME */
88 #define	SYSPTSIZE	(2 * NPTEPG)	/* 8mb */
89 #define	USRPTSIZE 	(1 * NPTEPG)	/* 4mb */
90 
91 /*
92  * PTEs for mapping user space into the kernel for phyio operations.
93  * One page is enough to handle 4Mb of simultaneous raw IO operations.
94  */
95 #ifndef USRIOSIZE
96 #define USRIOSIZE	(1 * NPTEPG)	/* 4mb */
97 #endif
98 
99 /*
100  * PTEs for system V style shared memory.
101  * This is basically slop for kmempt which we actually allocate (malloc) from.
102  */
103 #ifndef SHMMAXPGS
104 #define SHMMAXPGS	1024		/* 4mb */
105 #endif
106 
107 /*
108  * External IO space map size.
109  */
110 #ifndef EIOMAPSIZE
111 #define EIOMAPSIZE	0
112 #endif
113 
114 /*
115  * The time for a process to be blocked before being very swappable.
116  * This is a number of seconds which the system takes as being a non-trivial
117  * amount of real time.  You probably shouldn't change this;
118  * it is used in subtle ways (fractions and multiples of it are, that is, like
119  * half of a ``long time'', almost a long time, etc.)
120  * It is related to human patience and other factors which don't really
121  * change over time.
122  */
123 #define	MAXSLP 		20
124 
125 /*
126  * Mach derived constants
127  */
128 
129 /* user/kernel map constants */
130 #define VM_MIN_ADDRESS		((vaddr_t)0)
131 #define VM_MAXUSER_ADDRESS	((vaddr_t)0xFFFFD000)
132 #define VM_MAX_ADDRESS		((vaddr_t)0xFFFFD000)
133 #define VM_MIN_KERNEL_ADDRESS	((vaddr_t)0)
134 #define VM_MAX_KERNEL_ADDRESS	((vaddr_t)0xFFFFF000)
135 
136 /* virtual sizes (bytes) for various kernel submaps */
137 #define VM_PHYS_SIZE		(USRIOSIZE*NBPG)
138 
139 /* # of kernel PT pages (initial only, can grow dynamically) */
140 #define VM_KERNEL_PT_PAGES	((vsize_t)2)		/* XXX: SYSPTSIZE */
141 
142 /* pcb base */
143 #define	pcbb(p)		((u_int)(p)->p_addr)
144 
145 /*
146  * Constants which control the way the VM system deals with memory segments.
147  */
148 #define	VM_PHYSSEG_MAX		3
149 #define VM_PHYSSEG_STRAT	VM_PSTRAT_BIGFIRST
150 				/* Actually VM_PSTRAT_UPPERFIRST is needed */
151 #define	VM_PHYSSEG_NOADD
152 
153 #define	VM_NFREELIST		1
154 #define	VM_FREELIST_DEFAULT	0
155 
156 /*
157  * pmap-specific data stored in the vm_physmem[] array.
158  */
159 struct pmap_physseg {
160 	struct pv_entry *pvent;		/* pv table for this seg */
161 	char *attrs;			/* page attributes for this seg */
162 };
163 
164 #endif /* _X68K_VMPARAM_H_ */
165