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
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
36 * from: @(#)param.h 5.8 (Berkeley) 6/28/91
37 * $FreeBSD: src/sys/i386/include/param.h,v 1.62 2001/09/12 08:37:33 julian Exp $
41 * Machine dependent constants for Intel 386.
44 #ifndef _MACHINE_PARAM_H_
45 #define _MACHINE_PARAM_H_
48 #define MACHINE "i386"
51 #define MACHINE_ARCH "i386"
53 #define MID_MACHINE MID_I386
57 #define BIG_ENDIAN 4321
60 #define LITTLE_ENDIAN 1234
64 #define BYTE_ORDER LITTLE_ENDIAN
68 * OBJFORMAT_NAMES is a comma-separated list of the object formats
69 * that are supported on the architecture.
71 #define OBJFORMAT_NAMES "elf", "aout"
72 #define OBJFORMAT_DEFAULT "elf"
74 #define MAXHOSTNAMELEN 64
82 #define ALIGNBYTES _ALIGNBYTES
83 #define ALIGN(p) _ALIGN(p)
85 #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t)))
87 #define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t)))
88 #define PDRSHIFT 22 /* LOG2(NBPDR) */
89 #define NBPDR (1<<PDRSHIFT) /* bytes/page dir */
90 #define PDRMASK (NBPDR-1)
92 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
93 #define DEV_BSIZE (1<<DEV_BSHIFT)
96 #define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */
98 #define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */
99 #define MAXPHYS (128 * 1024) /* max raw I/O transfer size */
100 #define MAXDUMPPGS (DFLTPHYS/PAGE_SIZE)
102 #define IOPAGES 2 /* pages of i/o permission bitmap */
105 #define KSTACK_PAGES 2 /* Includes pcb! */
107 #define UAREA_PAGES 1 /* holds struct user WITHOUT PCB (see def.) */
109 #define KSTACK_GUARD /* compile in the kstack guard page */
112 * Ceiling on amount of swblock kva space.
114 #ifndef VM_SWZONE_SIZE_MAX
115 #define VM_SWZONE_SIZE_MAX (70 * 1024 * 1024)
119 * Ceiling on size of buffer cache (really only effects write queueing,
120 * the VM page cache is not effected).
122 #ifndef VM_BCACHE_SIZE_MAX
123 #define VM_BCACHE_SIZE_MAX (200 * 1024 * 1024)
128 * Constants related to network buffer management.
129 * MCLBYTES must be no larger than PAGE_SIZE.
132 #define MSIZE 256 /* size of an mbuf */
136 #define MCLSHIFT 11 /* convert bytes to mbuf clusters */
137 #endif /* MCLSHIFT */
138 #define MCLBYTES (1 << MCLSHIFT) /* size of an mbuf cluster */
141 * Some macros for units conversion
144 /* clicks to bytes */
145 #define ctob(x) ((x)<<PAGE_SHIFT)
147 /* bytes to clicks */
148 #define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT)
151 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We
152 * want to shift an unsigned type to avoid sign extension and we don't
153 * want to widen `bytes' unnecessarily. Assume that the result fits in
156 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
157 (sizeof (bytes) > sizeof(long) \
158 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \
159 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))
161 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
162 ((off_t)(db) << DEV_BSHIFT)
165 * Mach derived conversion macros
167 #define trunc_page(x) ((x) & ~PAGE_MASK)
168 #define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK)
169 #define trunc_4mpage(x) ((unsigned)(x) & ~PDRMASK)
170 #define round_4mpage(x) ((((unsigned)(x)) + PDRMASK) & ~PDRMASK)
172 #define atop(x) ((unsigned)(x) >> PAGE_SHIFT)
173 #define ptoa(x) ((unsigned)(x) << PAGE_SHIFT)
175 #define i386_btop(x) ((unsigned)(x) >> PAGE_SHIFT)
176 #define i386_ptob(x) ((unsigned)(x) << PAGE_SHIFT)
178 #define pgtok(x) ((x) * (PAGE_SIZE / 1024))
180 #endif /* !_MACHINE_PARAM_H_ */