1/*
2 * Copyright (c) 2000-2010 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28/*-
29 * Copyright (c) 1990, 1993
30 * The Regents of the University of California. All rights reserved.
31 * (c) UNIX System Laboratories, Inc.
32 * All or some portions of this file are derived from material licensed
33 * to the University of California by American Telephone and Telegraph
34 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
35 * the permission of UNIX System Laboratories, Inc.
36 *
37 * Redistribution and use in source and binary forms, with or without
38 * modification, are permitted provided that the following conditions
39 * are met:
40 * 1. Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * 2. Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in the
44 * documentation and/or other materials provided with the distribution.
45 * 3. All advertising materials mentioning features or use of this software
46 * must display the following acknowledgement:
47 * This product includes software developed by the University of
48 * California, Berkeley and its contributors.
49 * 4. Neither the name of the University nor the names of its contributors
50 * may be used to endorse or promote products derived from this software
51 * without specific prior written permission.
52 *
53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63 * SUCH DAMAGE.
64 *
65 * @(#)param.h 8.1 (Berkeley) 4/4/95
66 */
67
68/*
69 * Machine dependent constants for Intel 386.
70 */
71
72#ifndef _I386_PARAM_H_
73#define _I386_PARAM_H_
74
75#include <i386/_param.h>
76
77/*
78 * Round p (pointer or byte index) up to a correctly-aligned value for all
79 * data types (int, long, ...). The result is unsigned int and must be
80 * cast to any desired pointer type.
81 */
82#define ALIGNBYTES __DARWIN_ALIGNBYTES
83#define ALIGN(p) __DARWIN_ALIGN(p)
84
85#define NBPG 4096 /* bytes/page */
86#define PGOFSET (NBPG-1) /* byte offset into page */
87#define PGSHIFT 12 /* LOG2(NBPG) */
88
89#define DEV_BSIZE 512
90#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
91#define BLKDEV_IOSIZE 2048
92#define MAXPHYS (128 * 1024) /* max raw I/O transfer size */
93
94#define CLSIZE 1
95#define CLSIZELOG2 0
96
97/*
98 * Constants related to network buffer management.
99 * MCLBYTES must be no larger than CLBYTES (the software page size), and,
100 * on machines that exchange pages of input or output buffers with mbuf
101 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
102 * of the hardware page size.
103 */
104#define MSIZESHIFT 8 /* 256 */
105#define MSIZE (1 << MSIZESHIFT) /* size of an mbuf */
106#define MCLSHIFT 11 /* 2048 */
107#define MCLBYTES (1 << MCLSHIFT) /* size of an mbuf cluster */
108#define MBIGCLSHIFT 12 /* 4096 */
109#define MBIGCLBYTES (1 << MBIGCLSHIFT) /* size of a big cluster */
110#define M16KCLSHIFT 14 /* 16384 */
111#define M16KCLBYTES (1 << M16KCLSHIFT) /* size of a jumbo cluster */
112
113#define MCLOFSET (MCLBYTES - 1)
114#ifndef NMBCLUSTERS
115#define NMBCLUSTERS ((1024 * 1024) / MCLBYTES) /* cl map size: 1MB */
116#endif
117
118/*
119 * Some macros for units conversion
120 */
121/* Core clicks (NeXT_page_size bytes) to segments and vice versa */
122#define ctos(x) (x)
123#define stoc(x) (x)
124
125/* Core clicks (4096 bytes) to disk blocks */
126#define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
127#define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
128#define dtob(x) ((x)<<DEV_BSHIFT)
129
130/* clicks to bytes */
131#define ctob(x) ((x)<<PGSHIFT)
132
133/* bytes to clicks */
134#define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT)
135
136#ifdef __APPLE__
137#define btodb(bytes, devBlockSize) \
138 ((unsigned)(bytes) / devBlockSize)
139#define dbtob(db, devBlockSize) \
140 ((unsigned)(db) * devBlockSize)
141#else
142#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
143 ((unsigned)(bytes) >> DEV_BSHIFT)
144#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
145 ((unsigned)(db) << DEV_BSHIFT)
146#endif
147
148/*
149 * Map a ``block device block'' to a file system block.
150 * This should be device dependent, and will be if we
151 * add an entry to cdevsw/bdevsw for that purpose.
152 * For now though just use DEV_BSIZE.
153 */
154#define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
155
156/*
157 * Macros to decode (and encode) processor status word.
158 */
159#define STATUS_WORD(rpl, ipl) (((ipl) << 8) | (rpl))
160#define USERMODE(x) (((x) & 3) == 3)
161#define BASEPRI(x) (((x) & (255 << 8)) == 0)
162
163
164#if defined(KERNEL) || defined(STANDALONE)
165#define DELAY(n) delay(n)
166
167#else /* defined(KERNEL) || defined(STANDALONE) */
168#define DELAY(n) { int N = (n); while (--N > 0); }
169#endif /* defined(KERNEL) || defined(STANDALONE) */
170
171#endif /* _I386_PARAM_H_ */
172