2 * Copyright (c) 1990 The Regents of the University of California.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
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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
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33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * from: @(#)param.h 5.8 (Berkeley) 6/28/91
40 #ifndef _MACHINE_PARAM_H_
41 #define _MACHINE_PARAM_H_
44 * Machine dependent constants for Intel 386.
50 #define MACHINE "i386"
53 #define _MACHINE_ARCH i386
56 #define MACHINE_ARCH "i386"
58 #define MID_MACHINE MID_I386
61 * OBJFORMAT_NAMES is a comma-separated list of the object formats
62 * that are supported on the architecture.
64 #define OBJFORMAT_NAMES "elf", "aout"
65 #define OBJFORMAT_DEFAULT "elf"
74 * Round p (pointer or byte index) up to a correctly-aligned value
75 * for all data types (int, long, ...). The result is unsigned int
76 * and must be cast to any desired pointer type.
78 #define ALIGNBYTES (sizeof(int) - 1)
79 #define ALIGN(p) (((unsigned)(p) + ALIGNBYTES) & ~ALIGNBYTES)
81 #define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */
82 #define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */
83 #define PAGE_MASK (PAGE_SIZE-1)
84 #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t)))
86 #define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t)))
87 #define PDRSHIFT 22 /* LOG2(NBPDR) */
88 #define NBPDR (1<<PDRSHIFT) /* bytes/page dir */
89 #define PDRMASK (NBPDR-1)
91 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
92 #define DEV_BSIZE (1<<DEV_BSHIFT)
95 #define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */
97 #define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */
98 #define MAXPHYS (128 * 1024) /* max raw I/O transfer size */
100 #define IOPAGES 2 /* pages of i/o permission bitmap */
101 #define UPAGES 2 /* pages of u-area */
104 * Constants related to network buffer management.
105 * MCLBYTES must be no larger than CLBYTES (the software page size), and,
106 * on machines that exchange pages of input or output buffers with mbuf
107 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
108 * of the hardware page size.
111 #define MSIZE 256 /* size of an mbuf */
115 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */
116 #endif /* MCLSHIFT */
117 #define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */
118 #define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */
121 * Some macros for units conversion
124 /* clicks to bytes */
125 #define ctob(x) ((x)<<PAGE_SHIFT)
127 /* bytes to clicks */
128 #define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT)
131 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We
132 * want to shift an unsigned type to avoid sign extension and we don't
133 * want to widen `bytes' unnecessarily. Assume that the result fits in
136 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
137 (sizeof (bytes) > sizeof(long) \
138 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \
139 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))
141 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
142 ((off_t)(db) << DEV_BSHIFT)
145 * Mach derived conversion macros
147 #define trunc_page(x) ((x) & ~PAGE_MASK)
148 #define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK)
149 #define trunc_4mpage(x) ((unsigned)(x) & ~PDRMASK)
150 #define round_4mpage(x) ((((unsigned)(x)) + PDRMASK) & ~PDRMASK)
152 #define atop(x) ((unsigned)(x) >> PAGE_SHIFT)
153 #define ptoa(x) ((unsigned)(x) << PAGE_SHIFT)
155 #define i386_btop(x) ((unsigned)(x) >> PAGE_SHIFT)
156 #define i386_ptob(x) ((unsigned)(x) << PAGE_SHIFT)
158 #define pgtok(x) ((x) * (PAGE_SIZE / 1024))
160 #endif /* !_MACHINE_PARAM_H_ */