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 1.54.2.8 2002/08/31 21:15:55 dillon Exp $
38 * $DragonFly: src/sys/i386/include/Attic/param.h,v 1.3 2003/06/28 04:16:03 dillon Exp $
41 #ifndef _MACHINE_PARAM_H_
42 #define _MACHINE_PARAM_H_
45 * Machine dependent constants for Intel 386.
49 * Round p (pointer or byte index) up to a correctly-aligned value
50 * for all data types (int, long, ...). The result is unsigned int
51 * and must be cast to any desired pointer type.
54 #define _ALIGNBYTES (sizeof(int) - 1)
57 #define _ALIGN(p) (((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
64 #define _MACHINE_ARCH i386
67 #ifndef _NO_NAMESPACE_POLLUTION
70 #define MACHINE "i386"
73 #define MACHINE_ARCH "i386"
75 #define MID_MACHINE MID_I386
78 * OBJFORMAT_NAMES is a comma-separated list of the object formats
79 * that are supported on the architecture.
81 #define OBJFORMAT_NAMES "elf", "aout"
82 #define OBJFORMAT_DEFAULT "elf"
90 #define ALIGNBYTES _ALIGNBYTES
91 #define ALIGN(p) _ALIGN(p)
93 #define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */
94 #define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */
95 #define PAGE_MASK (PAGE_SIZE-1)
96 #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t)))
98 #define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t)))
99 #define PDRSHIFT 22 /* LOG2(NBPDR) */
100 #define NBPDR (1<<PDRSHIFT) /* bytes/page dir */
101 #define PDRMASK (NBPDR-1)
103 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
104 #define DEV_BSIZE (1<<DEV_BSHIFT)
106 #ifndef BLKDEV_IOSIZE
107 #define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */
109 #define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */
110 #define MAXPHYS (128 * 1024) /* max raw I/O transfer size */
111 #define MAXDUMPPGS (DFLTPHYS/PAGE_SIZE)
113 #define IOPAGES 2 /* pages of i/o permission bitmap */
114 #define UPAGES 3 /* pages of u-area */
117 * Ceiling on amount of swblock kva space, can be changed via
118 * kern.maxswzone /boot/loader.conf variable.
120 #ifndef VM_SWZONE_SIZE_MAX
121 #define VM_SWZONE_SIZE_MAX (32 * 1024 * 1024)
125 * Ceiling on size of buffer cache (really only effects write queueing,
126 * the VM page cache is not effected), can be changed via
127 * kern.maxbcache /boot/loader.conf variable.
129 #ifndef VM_BCACHE_SIZE_MAX
130 #define VM_BCACHE_SIZE_MAX (200 * 1024 * 1024)
135 * Constants related to network buffer management.
136 * MCLBYTES must be no larger than CLBYTES (the software page size), and,
137 * on machines that exchange pages of input or output buffers with mbuf
138 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
139 * of the hardware page size.
142 #define MSIZE 256 /* size of an mbuf */
146 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */
147 #endif /* MCLSHIFT */
148 #define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */
149 #define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */
152 * Some macros for units conversion
155 /* clicks to bytes */
156 #define ctob(x) ((x)<<PAGE_SHIFT)
158 /* bytes to clicks */
159 #define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT)
162 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We
163 * want to shift an unsigned type to avoid sign extension and we don't
164 * want to widen `bytes' unnecessarily. Assume that the result fits in
167 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
168 (sizeof (bytes) > sizeof(long) \
169 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \
170 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))
172 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
173 ((off_t)(db) << DEV_BSHIFT)
176 * Mach derived conversion macros
178 #define trunc_page(x) ((x) & ~PAGE_MASK)
179 #define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK)
180 #define trunc_4mpage(x) ((unsigned)(x) & ~PDRMASK)
181 #define round_4mpage(x) ((((unsigned)(x)) + PDRMASK) & ~PDRMASK)
183 #define atop(x) ((unsigned)(x) >> PAGE_SHIFT)
184 #define ptoa(x) ((unsigned)(x) << PAGE_SHIFT)
186 #define i386_btop(x) ((unsigned)(x) >> PAGE_SHIFT)
187 #define i386_ptob(x) ((unsigned)(x) << PAGE_SHIFT)
189 #define pgtok(x) ((x) * (PAGE_SIZE / 1024))
194 * We put here the definition of two debugging macros/function which
195 * are very convenient to have available.
196 * The macro is called TSTMP() and is used to timestamp events in the
197 * kernel using the TSC register, and export them to userland through
198 * the sysctl variable debug.timestamp, which is a circular buffer
199 * holding pairs of u_int32_t variables <timestamp, argument> .
200 * They can be retrieved with something like
202 * sysctl -b debug.timestamp | hexdump -e '"%15u %15u\n"'
204 * The function _TSTMP() is defined in i386/isa/clock.c. It does not
205 * try to grab any locks or block interrupts or identify which CPU it
206 * is running on. You are supposed to know what to do if you use it.
208 * The macros must be enabled with "options KERN_TIMESTAMP" in the kernel
209 * config file, otherwise they default to an empty block.
212 #ifdef KERN_TIMESTAMP
213 extern void _TSTMP(u_int32_t argument);
214 #define TSTMP(class, unit, event, par) _TSTMP( \
215 (((class) & 0x0f) << 28 ) | \
216 (((unit) & 0x0f) << 24 ) | \
217 (((event) & 0xff) << 16 ) | \
218 (((par) & 0xffff) ) )
220 #else /* !KERN_TIMESTAMP */
222 #define TSTMP(class, unit, event, par) _TSTMP(0)
223 #endif /* !KERN_TIMESTAMP */
226 #endif /* !_NO_NAMESPACE_POLLUTION */
227 #endif /* !_MACHINE_PARAM_H_ */