vmparam.h revision 1.20 
1/*	$NetBSD: vmparam.h,v 1.20 2003/05/03 18:25:30 thorpej Exp $	*/
2
3/*
4 * Copyright (c) 1988 The Regents of the University of California.
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 University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#ifndef	_ARM32_VMPARAM_H_
37#define	_ARM32_VMPARAM_H_
38
39#ifdef _KERNEL
40
41#include <arm/arm32/vmparam.h>
42
43/*
44 * Address space constants
45 */
46
47/*
48 * The line between user space and kernel space
49 * Mappings >= KERNEL_BASE are constant across all processes
50 */
51#define	KERNEL_BASE		0xf0000000
52
53/* Various constants used by the MD code*/
54#define	KERNEL_VM_BASE		(KERNEL_BASE + 0x01000000)
55/*
56 * The Kernel VM Size varies depending on the machine depending on how
57 * much space is needed (and where) for other mappings.
58 * In some cases the chosen value may not be the maximum in order that
59 * we don't waste memory with kernel pages tables as we can't currently
60 * grow the kernel page tables after booting.
61 * You only need to increase these values if you find that the number of
62 * buffers is being limited due to lack of VA space.
63 */
64
65/*
66 * The range 0xf1000000 - 0xfcffffff is available for kernel VM space
67 * Footbridge registers and I/O mappings occupy 0xfd000000 - 0xffffffff
68 */
69
70/*
71 * Size of available KVM space, note that growkernel will grow into this.
72 */
73#define KERNEL_VM_SIZE	0x0C000000
74
75/*
76 * Override the default pager_map size, there's not enough KVA.
77 */
78#define PAGER_MAP_SIZE		(4 * 1024 * 1024)
79
80/*
81 * Size of User Raw I/O map
82 */
83
84#define USRIOSIZE       300
85
86/* XXX max. amount of KVM to be used by buffers. */
87#ifndef VM_MAX_KERNEL_BUF
88#define VM_MAX_KERNEL_BUF \
89	(((KERNEL_VM_SIZE) * 4) / 10)
90#endif
91
92/* virtual sizes (bytes) for various kernel submaps */
93
94#define VM_PHYS_SIZE		(USRIOSIZE*PAGE_SIZE)
95
96/*
97 * max number of non-contig chunks of physical RAM you can have
98 */
99
100#define	VM_PHYSSEG_MAX		32
101
102/*
103 * when converting a physical address to a vm_page structure, we
104 * want to use a binary search on the chunks of physical memory
105 * to find our RAM
106 */
107
108#define	VM_PHYSSEG_STRAT	VM_PSTRAT_BSEARCH
109
110/*
111 * this indicates that we can't add RAM to the VM system after the
112 * vm system is init'd.
113 */
114
115#define	VM_PHYSSEG_NOADD
116
117/*
118 * we support 2 free lists:
119 *
120 *	- DEFAULT for all systems
121 *	- ISADMA for the ISA DMA range on Sharks only
122 */
123
124#define	VM_NFREELIST		2
125#define	VM_FREELIST_DEFAULT	0
126#define	VM_FREELIST_ISADMA	1
127
128#endif /* _KERNEL */
129
130#endif	/* _ARM32_VMPARAM_H_ */
131