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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /* Copyright (c) 1993,1995 NeXT Computer, Inc. All Rights Reserved */
26: /*-
27: * Copyright (c) 1990, 1993
28: * The Regents of the University of California. All rights reserved.
29: *
30: * The NEXTSTEP Software License Agreement specifies the terms
31: * and conditions for redistribution.
32: *
33: * @(#)param.h 8.1 (Berkeley) 6/11/93
34: */
35:
36: /*
37: * Machine dependent constants for Intel 386.
38: */
39:
40: #ifndef _I386_PARAM_H_
41: #define _I386_PARAM_H_
42:
43: /*
44: * Round p (pointer or byte index) up to a correctly-aligned value for all
45: * data types (int, long, ...). The result is u_int and must be cast to
46: * any desired pointer type.
47: */
48: #define ALIGNBYTES 3
49: #define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
50:
51: #define NBPG 8192 /* bytes/page */
52: #define PGOFSET (NBPG-1) /* byte offset into page */
53: #define PGSHIFT 13 /* LOG2(NBPG) */
54:
55: #define DEV_BSIZE 512
56: #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
57: #define BLKDEV_IOSIZE 2048
58: #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */
59:
60: #define STACK_GROWS_UP 0 /* stack grows to lower addresses */
61:
62: #define CLSIZE 1
63: #define CLSIZELOG2 0
64:
65: /*
66: * Constants related to network buffer management.
67: * MCLBYTES must be no larger than CLBYTES (the software page size), and,
68: * on machines that exchange pages of input or output buffers with mbuf
69: * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
70: * of the hardware page size.
71: */
72: #define MSIZE 128 /* size of an mbuf */
73: #define MCLBYTES 2048 /* large enough for ether MTU */
74: #define MCLSHIFT 11
75: #define MCLOFSET (MCLBYTES - 1)
76: #ifndef NMBCLUSTERS
77: #ifdef GATEWAY
78: #define NMBCLUSTERS ((1024 * 1024) / MCLBYTES) /* cl map size: 1MB */
79: #else
80: #define NMBCLUSTERS ((1024 * 512) / MCLBYTES) /* cl map size: 0.5MB */
81: #endif
82: #endif
83:
84: /*
85: * Some macros for units conversion
86: */
87: /* Core clicks (NeXT_page_size bytes) to segments and vice versa */
88: #define ctos(x) (x)
89: #define stoc(x) (x)
90:
91: /* Core clicks (4096 bytes) to disk blocks */
92: #define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
93: #define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
94: #define dtob(x) ((x)<<DEV_BSHIFT)
95:
96: /* clicks to bytes */
97: #define ctob(x) ((x)<<PGSHIFT)
98:
99: /* bytes to clicks */
100: #define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT)
101:
102: #ifdef __APPLE__
103: #define btodb(bytes, devBlockSize) \
104: ((unsigned)(bytes) / devBlockSize)
105: #define dbtob(db, devBlockSize) \
106: ((unsigned)(db) * devBlockSize)
107: #else
108: #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
109: ((unsigned)(bytes) >> DEV_BSHIFT)
110: #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
111: ((unsigned)(db) << DEV_BSHIFT)
112: #endif
113:
114: /*
115: * Map a ``block device block'' to a file system block.
116: * This should be device dependent, and will be if we
117: * add an entry to cdevsw/bdevsw for that purpose.
118: * For now though just use DEV_BSIZE.
119: */
120: #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
121:
122: /*
123: * Macros to decode (and encode) processor status word.
124: */
125: #define STATUS_WORD(rpl, ipl) (((ipl) << 8) | (rpl))
126: #define USERMODE(x) (((x) & 3) == 3)
127: #define BASEPRI(x) (((x) & (255 << 8)) == 0)
128:
129: #ifndef __ASSEMBLER__
130: /*
131: * Pull in our definition of simple_lock_data_t.
132: */
133: #import <mach/machine/simple_lock.h>
134:
135: #endif /* __ASSEMBLER__ */
136:
137: #if defined(KERNEL) || defined(STANDALONE)
138: #define DELAY(n) us_spin(n)
139:
140: #else /* defined(KERNEL) || defined(STANDALONE) */
141: #define DELAY(n) { register int N = (n); while (--N > 0); }
142: #endif /* defined(KERNEL) || defined(STANDALONE) */
143:
144: #endif /* _I386_PARAM_H_ */
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