master
1/*
2 * Copyright (c) 2000-2010 Apple Inc. All rights reserved.
3 */
4/*-
5 * Copyright (c) 1990, 1993
6 * The Regents of the University of California. All rights reserved.
7 * (c) UNIX System Laboratories, Inc.
8 * All or some portions of this file are derived from material licensed
9 * to the University of California by American Telephone and Telegraph
10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
11 * the permission of UNIX System Laboratories, Inc.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. All advertising materials mentioning features or use of this software
22 * must display the following acknowledgement:
23 * This product includes software developed by the University of
24 * California, Berkeley and its contributors.
25 * 4. Neither the name of the University nor the names of its contributors
26 * may be used to endorse or promote products derived from this software
27 * without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * SUCH DAMAGE.
40 *
41 * @(#)param.h 8.1 (Berkeley) 4/4/95
42 */
43
44/*
45 * Machine dependent constants for ARM
46 */
47
48#ifndef _ARM_PARAM_H_
49#define _ARM_PARAM_H_
50
51#if defined (__arm__) || defined (__arm64__)
52
53#include <arm/_param.h>
54
55/*
56 * Round p (pointer or byte index) up to a correctly-aligned value for all
57 * data types (int, long, ...). The result is unsigned int and must be
58 * cast to any desired pointer type.
59 */
60#define ALIGNBYTES __DARWIN_ALIGNBYTES
61#define ALIGN(p) __DARWIN_ALIGN(p)
62
63#define NBPG 4096 /* bytes/page */
64#define PGOFSET (NBPG-1) /* byte offset into page */
65#define PGSHIFT 12 /* LOG2(NBPG) */
66
67#define DEV_BSIZE 512
68#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
69#define BLKDEV_IOSIZE 2048
70#define MAXPHYS (64 * 1024) /* max raw I/O transfer size */
71
72#define CLSIZE 1
73#define CLSIZELOG2 0
74
75/*
76 * Constants related to network buffer management.
77 * MCLBYTES must be no larger than CLBYTES (the software page size), and,
78 * on machines that exchange pages of input or output buffers with mbuf
79 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
80 * of the hardware page size.
81 */
82#define MSIZESHIFT 8 /* 256 */
83#define MSIZE (1 << MSIZESHIFT) /* size of an mbuf */
84#define MCLSHIFT 11 /* 2048 */
85#define MCLBYTES (1 << MCLSHIFT) /* size of an mbuf cluster */
86#define MBIGCLSHIFT 12 /* 4096 */
87#define MBIGCLBYTES (1 << MBIGCLSHIFT) /* size of a big cluster */
88#define M16KCLSHIFT 14 /* 16384 */
89#define M16KCLBYTES (1 << M16KCLSHIFT) /* size of a jumbo cluster */
90
91#define MCLOFSET (MCLBYTES - 1)
92#ifndef NMBCLUSTERS
93#define NMBCLUSTERS CONFIG_NMBCLUSTERS /* cl map size */
94#endif
95
96/*
97 * Some macros for units conversion
98 */
99/* Core clicks (NeXT_page_size bytes) to segments and vice versa */
100#define ctos(x) (x)
101#define stoc(x) (x)
102
103/* Core clicks (4096 bytes) to disk blocks */
104#define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
105#define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
106#define dtob(x) ((x)<<DEV_BSHIFT)
107
108/* clicks to bytes */
109#define ctob(x) ((x)<<PGSHIFT)
110
111/* bytes to clicks */
112#define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT)
113
114#ifdef __APPLE__
115#define btodb(bytes, devBlockSize) \
116 ((unsigned)(bytes) / devBlockSize)
117#define dbtob(db, devBlockSize) \
118 ((unsigned)(db) * devBlockSize)
119#else
120#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
121 ((unsigned)(bytes) >> DEV_BSHIFT)
122#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
123 ((unsigned)(db) << DEV_BSHIFT)
124#endif
125
126/*
127 * Map a ``block device block'' to a file system block.
128 * This should be device dependent, and will be if we
129 * add an entry to cdevsw/bdevsw for that purpose.
130 * For now though just use DEV_BSIZE.
131 */
132#define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
133
134/*
135 * Macros to decode (and encode) processor status word.
136 */
137#define STATUS_WORD(rpl, ipl) (((ipl) << 8) | (rpl))
138#define USERMODE(x) (((x) & 3) == 3)
139#define BASEPRI(x) (((x) & (255 << 8)) == 0)
140
141
142#if defined(KERNEL) || defined(STANDALONE)
143#define DELAY(n) delay(n)
144
145#else /* defined(KERNEL) || defined(STANDALONE) */
146#define DELAY(n) { int N = (n); while (--N > 0); }
147#endif /* defined(KERNEL) || defined(STANDALONE) */
148
149#endif /* defined (__arm__) || defined (__arm64__) */
150
151#endif /* _ARM_PARAM_H_ */