param.h revision 1.2 
1/*	$NetBSD: param.h,v 1.2 2001/07/13 19:43:15 matt Exp $	*/
2
3/*
4 * Copyright (c) 1994,1995 Mark Brinicombe.
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 RiscBSD team.
18 * 4. The name "RiscBSD" nor the name of the author may be used to
19 *    endorse or promote products derived from this software without specific
20 *    prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY RISCBSD ``AS IS'' AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL RISCBSD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
26 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
27 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
28 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#ifndef	_ARM_PARAM_H_
36#define	_ARM_PARAM_H_
37
38/*
39 * Machine dependent constants for all ARM processors
40 */
41
42/* MACHINE and MACHINE_ARCH are defined by individual ports. */
43
44#define	MID_MACHINE	MID_ARM6
45
46/*
47 * Round p (pointer or byte index) up to a correctly-aligned value
48 * for all data types (int, long, ...).   The result is u_int and
49 * must be cast to any desired pointer type.
50 *
51 * ALIGNED_POINTER is a boolean macro that checks whether an address
52 * is valid to fetch data elements of type t from on this architecture.
53 * This does not reflect the optimal alignment, just the possibility
54 * (within reasonable limits).
55 *
56 */
57#define ALIGNBYTES		(sizeof(int) - 1)
58#define ALIGN(p)		(((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
59#define ALIGNED_POINTER(p,t)	((((u_long)(p)) & (sizeof(t)-1)) == 0)
60
61#define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
62#define	DEV_BSIZE	(1 << DEV_BSHIFT)
63#define	BLKDEV_IOSIZE	2048
64
65#ifndef MAXPHYS
66#define	MAXPHYS		65536		/* max I/O transfer size */
67#endif
68
69/* pages ("clicks") to disk blocks */
70#define	ctod(x)	((x) << (PGSHIFT - DEV_BSHIFT))
71#define	dtoc(x)	((x) >> (PGSHIFT - DEV_BSHIFT))
72/*#define	dtob(x)	((x) << DEV_BSHIFT)*/
73
74#define	ctob(x)	((x) << PGSHIFT)
75
76/* bytes to pages */
77#define	btoc(x)	(((x) + PGOFSET) >> PGSHIFT)
78
79#define	btodb(bytes)	 		/* calculates (bytes / DEV_BSIZE) */ \
80	((bytes) >> DEV_BSHIFT)
81#define	dbtob(db)			/* calculates (db * DEV_BSIZE) */ \
82	((db) << DEV_BSHIFT)
83
84/*
85 * Map a ``block device block'' to a file system block.
86 * This should be device dependent, and should use the bsize
87 * field from the disk label.
88 * For now though just use DEV_BSIZE.
89 */
90#define	bdbtofsb(bn)	((bn) / (BLKDEV_IOSIZE / DEV_BSIZE))
91
92/*
93 * Constants related to network buffer management.
94 * MCLBYTES must be no larger than NBPG (the software page size), and,
95 * on machines that exchange pages of input or output buffers with mbuf
96 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
97 * of the hardware page size.
98 */
99#define	MSIZE		256		/* size of an mbuf */
100#define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
101#define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
102#define	MCLOFSET	(MCLBYTES - 1)	/* offset within a m_buf cluster */
103
104#endif /* _ARM_PARAM_H_ */
105