param.h revision 1.4 
1/*	$NetBSD: param.h,v 1.4 2001/08/07 22:54:00 bjh21 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/*
43 * For KERNEL code:
44 *	MACHINE must be defined by the individual port.
45 *	MACHINE_ARCH may be defined by an individual port.
46 *
47 * For non-KERNEL code:
48 *	MACHINE && MACHINE_ARCH default to "arm"
49 */
50
51#ifndef _KERNEL
52#ifndef MACHINE
53#define	MACHINE		"arm"
54#endif
55#endif /* !_KERNEL */
56
57#ifndef MACHINE_ARCH
58#define	MACHINE_ARCH	"arm"
59#endif
60
61#define	MID_MACHINE	MID_ARM6
62
63/*
64 * Round p (pointer or byte index) up to a correctly-aligned value
65 * for all data types (int, long, ...).   The result is u_int and
66 * must be cast to any desired pointer type.
67 *
68 * ALIGNED_POINTER is a boolean macro that checks whether an address
69 * is valid to fetch data elements of type t from on this architecture.
70 * This does not reflect the optimal alignment, just the possibility
71 * (within reasonable limits).
72 *
73 */
74#define ALIGNBYTES		(sizeof(int) - 1)
75#define ALIGN(p)		(((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
76#define ALIGNED_POINTER(p,t)	((((u_long)(p)) & (sizeof(t)-1)) == 0)
77/* ARM-specific macro to align a stack pointer (downwards). */
78#define STACKALIGNBYTES		(8 - 1)
79#define STACKALIGN(p)		((u_int)(p) &~ STACKALIGNBYTES)
80
81#define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
82#define	DEV_BSIZE	(1 << DEV_BSHIFT)
83#define	BLKDEV_IOSIZE	2048
84
85#ifndef MAXPHYS
86#define	MAXPHYS		65536		/* max I/O transfer size */
87#endif
88
89/* pages ("clicks") to disk blocks */
90#define	ctod(x)	((x) << (PGSHIFT - DEV_BSHIFT))
91#define	dtoc(x)	((x) >> (PGSHIFT - DEV_BSHIFT))
92/*#define	dtob(x)	((x) << DEV_BSHIFT)*/
93
94#define	ctob(x)	((x) << PGSHIFT)
95
96/* bytes to pages */
97#define	btoc(x)	(((x) + PGOFSET) >> PGSHIFT)
98
99#define	btodb(bytes)	 		/* calculates (bytes / DEV_BSIZE) */ \
100	((bytes) >> DEV_BSHIFT)
101#define	dbtob(db)			/* calculates (db * DEV_BSIZE) */ \
102	((db) << DEV_BSHIFT)
103
104/*
105 * Map a ``block device block'' to a file system block.
106 * This should be device dependent, and should use the bsize
107 * field from the disk label.
108 * For now though just use DEV_BSIZE.
109 */
110#define	bdbtofsb(bn)	((bn) / (BLKDEV_IOSIZE / DEV_BSIZE))
111
112/*
113 * Constants related to network buffer management.
114 * MCLBYTES must be no larger than NBPG (the software page size), and,
115 * on machines that exchange pages of input or output buffers with mbuf
116 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
117 * of the hardware page size.
118 */
119#define	MSIZE		256		/* size of an mbuf */
120#define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
121#define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
122#define	MCLOFSET	(MCLBYTES - 1)	/* offset within a m_buf cluster */
123
124#endif /* _ARM_PARAM_H_ */
125