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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /*-
23: * Copyright (c) 1990, 1993
24: * The Regents of the University of California. All rights reserved.
25: * (c) UNIX System Laboratories, Inc.
26: * All or some portions of this file are derived from material licensed
27: * to the University of California by American Telephone and Telegraph
28: * Co. or Unix System Laboratories, Inc. and are reproduced herein with
29: * the permission of UNIX System Laboratories, Inc.
30: *
31: * Redistribution and use in source and binary forms, with or without
32: * modification, are permitted provided that the following conditions
33: * are met:
34: * 1. Redistributions of source code must retain the above copyright
35: * notice, this list of conditions and the following disclaimer.
36: * 2. Redistributions in binary form must reproduce the above copyright
37: * notice, this list of conditions and the following disclaimer in the
38: * documentation and/or other materials provided with the distribution.
39: * 3. All advertising materials mentioning features or use of this software
40: * must display the following acknowledgement:
41: * This product includes software developed by the University of
42: * California, Berkeley and its contributors.
43: * 4. Neither the name of the University nor the names of its contributors
44: * may be used to endorse or promote products derived from this software
45: * without specific prior written permission.
46: *
47: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
48: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
49: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
50: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
51: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
52: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
53: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
54: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
55: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
56: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
57: * SUCH DAMAGE.
58: *
59: * @(#)param.h 8.1 (Berkeley) 4/4/95
60: */
61:
62: /*
63: * Machine dependent constants for Intel 386.
64: */
65:
66: #ifndef _I386_PARAM_H_
67: #define _I386_PARAM_H_
68:
69: /*
70: * Round p (pointer or byte index) up to a correctly-aligned value for all
71: * data types (int, long, ...). The result is u_int and must be cast to
72: * any desired pointer type.
73: */
74: #define ALIGNBYTES 3
75: #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
76:
77: #define NBPG 4096 /* bytes/page */
78: #define PGOFSET (NBPG-1) /* byte offset into page */
79: #define PGSHIFT 12 /* LOG2(NBPG) */
80:
81: #define DEV_BSIZE 512
82: #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
83: #define BLKDEV_IOSIZE 2048
84: #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */
85:
86: #define STACK_GROWS_UP 0 /* stack grows to lower addresses */
87:
88: #define CLSIZE 1
89: #define CLSIZELOG2 0
90:
91: /*
92: * Constants related to network buffer management.
93: * MCLBYTES must be no larger than CLBYTES (the software page size), and,
94: * on machines that exchange pages of input or output buffers with mbuf
95: * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
96: * of the hardware page size.
97: */
98: #define MSIZE 128 /* size of an mbuf */
99: #define MCLBYTES 2048 /* large enough for ether MTU */
100: #define MCLSHIFT 11
101: #define MCLOFSET (MCLBYTES - 1)
102: #ifndef NMBCLUSTERS
103: #ifdef GATEWAY
104: #define NMBCLUSTERS ((1024 * 1024) / MCLBYTES) /* cl map size: 1MB */
105: #else
106: #define NMBCLUSTERS ((1024 * 512) / MCLBYTES) /* cl map size: 0.5MB */
107: #endif
108: #endif
109:
110: /*
111: * Some macros for units conversion
112: */
113: /* Core clicks (NeXT_page_size bytes) to segments and vice versa */
114: #define ctos(x) (x)
115: #define stoc(x) (x)
116:
117: /* Core clicks (4096 bytes) to disk blocks */
118: #define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
119: #define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
120: #define dtob(x) ((x)<<DEV_BSHIFT)
121:
122: /* clicks to bytes */
123: #define ctob(x) ((x)<<PGSHIFT)
124:
125: /* bytes to clicks */
126: #define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT)
127:
128: #ifdef __APPLE__
129: #define btodb(bytes, devBlockSize) \
130: ((unsigned)(bytes) / devBlockSize)
131: #define dbtob(db, devBlockSize) \
132: ((unsigned)(db) * devBlockSize)
133: #else
134: #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
135: ((unsigned)(bytes) >> DEV_BSHIFT)
136: #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
137: ((unsigned)(db) << DEV_BSHIFT)
138: #endif
139:
140: /*
141: * Map a ``block device block'' to a file system block.
142: * This should be device dependent, and will be if we
143: * add an entry to cdevsw/bdevsw for that purpose.
144: * For now though just use DEV_BSIZE.
145: */
146: #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
147:
148: /*
149: * Macros to decode (and encode) processor status word.
150: */
151: #define STATUS_WORD(rpl, ipl) (((ipl) << 8) | (rpl))
152: #define USERMODE(x) (((x) & 3) == 3)
153: #define BASEPRI(x) (((x) & (255 << 8)) == 0)
154:
155:
156: #if defined(KERNEL) || defined(STANDALONE)
157: #define DELAY(n) delay(n)
158:
159: #else /* defined(KERNEL) || defined(STANDALONE) */
160: #define DELAY(n) { register int N = (n); while (--N > 0); }
161: #endif /* defined(KERNEL) || defined(STANDALONE) */
162:
163: #endif /* _I386_PARAM_H_ */
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