1 /*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * from: @(#)param.h 5.8 (Berkeley) 6/28/91
37 * $FreeBSD$
38 */
39
40 #ifndef _MACHINE_PARAM_H_
41 #define _MACHINE_PARAM_H_
42
43 /*
44 * Machine dependent constants for Intel 386.
45 */
46 #define _MACHINE i386
47 #define MACHINE "i386"
48 #define _MACHINE_ARCH i386
49 #define MACHINE_ARCH "i386"
50 #define MID_MACHINE MID_I386
51
52 /*
53 * OBJFORMAT_NAMES is a comma-separated list of the object formats
54 * that are supported on the architecture.
55 */
56 #define OBJFORMAT_NAMES "elf", "aout"
57 #define OBJFORMAT_DEFAULT "elf"
58
59 #ifdef SMP
60 #define NCPUS 2
61 #else
62 #define NCPUS 1
63 #endif
64
65 /*
66 * Round p (pointer or byte index) up to a correctly-aligned value
67 * for all data types (int, long, ...). The result is unsigned int
68 * and must be cast to any desired pointer type.
69 */
70 #define ALIGNBYTES (sizeof(int) - 1)
71 #define ALIGN(p) (((unsigned)(p) + ALIGNBYTES) & ~ALIGNBYTES)
72
73 #define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */
74 #define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */
75 #define PAGE_MASK (PAGE_SIZE-1)
76 #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t)))
77
78 #define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t)))
79 #define PDRSHIFT 22 /* LOG2(NBPDR) */
80 #define NBPDR (1<<PDRSHIFT) /* bytes/page dir */
81 #define PDRMASK (NBPDR-1)
82
83 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
84 #define DEV_BSIZE (1<<DEV_BSHIFT)
85
86 #define BLKDEV_IOSIZE 2048
87 #define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */
88 #define MAXPHYS (128 * 1024) /* max raw I/O transfer size */
89
90 #define IOPAGES 2 /* pages of i/o permission bitmap */
91 #define UPAGES 2 /* pages of u-area */
92 #define UPAGES_HOLE 2 /* pages of "hole" at top of user space where */
93 /* the upages used to be. DO NOT CHANGE! */
94
95 /*
96 * Constants related to network buffer management.
97 * MCLBYTES must be no larger than CLBYTES (the software page size), and,
98 * on machines that exchange pages of input or output buffers with mbuf
99 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
100 * of the hardware page size.
101 */
102 #ifndef MSIZE
103 #define MSIZE 128 /* size of an mbuf */
104 #endif /* MSIZE */
105
106 #ifndef MCLSHIFT
107 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */
108 #endif /* MCLSHIFT */
109 #define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */
110 #define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */
111
112 /*
113 * Some macros for units conversion
114 */
115
116 /* clicks to bytes */
117 #define ctob(x) ((x)<<PAGE_SHIFT)
118
119 /* bytes to clicks */
120 #define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT)
121
122 /*
123 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We
124 * want to shift an unsigned type to avoid sign extension and we don't
125 * want to widen `bytes' unnecessarily. Assume that the result fits in
126 * a daddr_t.
127 */
128 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
129 (sizeof (bytes) > sizeof(long) \
130 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \
131 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))
132
133 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
134 ((off_t)(db) << DEV_BSHIFT)
135
136 /*
137 * Mach derived conversion macros
138 */
139 #define trunc_page(x) ((x) & ~PAGE_MASK)
140 #define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK)
141 #define trunc_4mpage(x) ((unsigned)(x) & ~PDRMASK)
142 #define round_4mpage(x) ((((unsigned)(x)) + PDRMASK) & ~PDRMASK)
143
144 #define atop(x) ((unsigned)(x) >> PAGE_SHIFT)
145 #define ptoa(x) ((unsigned)(x) << PAGE_SHIFT)
146
147 #define i386_btop(x) ((unsigned)(x) >> PAGE_SHIFT)
148 #define i386_ptob(x) ((unsigned)(x) << PAGE_SHIFT)
149
150 #endif /* !_MACHINE_PARAM_H_ */
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