Start removing the old build infrastructure for the a.out
[dragonfly.git] / sys / cpu / i386 / include / param.h
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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: src/sys/i386/include/param.h,v 1.54.2.8 2002/08/31 21:15:55 dillon Exp $
aa8d5dcb 38 * $DragonFly: src/sys/cpu/i386/include/param.h,v 1.7 2004/03/20 16:27:41 drhodus Exp $
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39 */
40
85100692 41#ifndef _MACHINE_PARAM_H_
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42
43/*
44 * Do not prevent re-includes of <machine/param.h> if the file was included
45 * with NO_NAMESPACE_POLLUTION, or expected macros will not exist.
46 */
47#ifndef _NO_NAMESPACE_POLLUTION
85100692 48#define _MACHINE_PARAM_H_
6168d606 49#endif
85100692 50
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51/*
52 * Machine dependent constants for Intel 386.
53 */
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54#ifndef _MACHINE_PARAM_H1_
55#define _MACHINE_PARAM_H1_
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56
57/*
58 * Round p (pointer or byte index) up to a correctly-aligned value
59 * for all data types (int, long, ...). The result is unsigned int
60 * and must be cast to any desired pointer type.
61 */
62#ifndef _ALIGNBYTES
63#define _ALIGNBYTES (sizeof(int) - 1)
64#endif
65#ifndef _ALIGN
66#define _ALIGN(p) (((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
67#endif
68
69#ifndef _MACHINE
70#define _MACHINE i386
71#endif
72#ifndef _MACHINE_ARCH
73#define _MACHINE_ARCH i386
74#endif
75
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76#endif /* _MACHINE_PARAM_H1_ */
77
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78#ifndef _NO_NAMESPACE_POLLUTION
79
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80#ifndef MACHINE
81#define MACHINE "i386"
82#endif
83#ifndef MACHINE_ARCH
84#define MACHINE_ARCH "i386"
85#endif
86#define MID_MACHINE MID_I386
87
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88/*
89 * Use SMP_MAXCPU instead of MAXCPU for structures that are intended to
90 * remain compatible between UP and SMP builds.
91 */
92#define SMP_MAXCPU 16
984263bc 93#ifdef SMP
bba6a44d 94#define MAXCPU SMP_MAXCPU
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95#else
96#define MAXCPU 1
97#endif /* SMP */
98
99#define ALIGNBYTES _ALIGNBYTES
100#define ALIGN(p) _ALIGN(p)
101
102#define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */
103#define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */
104#define PAGE_MASK (PAGE_SIZE-1)
105#define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t)))
106
107#define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t)))
108#define PDRSHIFT 22 /* LOG2(NBPDR) */
109#define NBPDR (1<<PDRSHIFT) /* bytes/page dir */
110#define PDRMASK (NBPDR-1)
111
112#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
113#define DEV_BSIZE (1<<DEV_BSHIFT)
114
115#ifndef BLKDEV_IOSIZE
116#define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */
117#endif
118#define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */
119#define MAXPHYS (128 * 1024) /* max raw I/O transfer size */
120#define MAXDUMPPGS (DFLTPHYS/PAGE_SIZE)
121
122#define IOPAGES 2 /* pages of i/o permission bitmap */
123#define UPAGES 3 /* pages of u-area */
124
125/*
126 * Ceiling on amount of swblock kva space, can be changed via
127 * kern.maxswzone /boot/loader.conf variable.
128 */
129#ifndef VM_SWZONE_SIZE_MAX
130#define VM_SWZONE_SIZE_MAX (32 * 1024 * 1024)
131#endif
132
133/*
134 * Ceiling on size of buffer cache (really only effects write queueing,
135 * the VM page cache is not effected), can be changed via
136 * kern.maxbcache /boot/loader.conf variable.
137 */
138#ifndef VM_BCACHE_SIZE_MAX
139#define VM_BCACHE_SIZE_MAX (200 * 1024 * 1024)
140#endif
141
142
143/*
144 * Constants related to network buffer management.
145 * MCLBYTES must be no larger than CLBYTES (the software page size), and,
146 * on machines that exchange pages of input or output buffers with mbuf
147 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
148 * of the hardware page size.
149 */
150#ifndef MSIZE
151#define MSIZE 256 /* size of an mbuf */
152#endif /* MSIZE */
153
154#ifndef MCLSHIFT
155#define MCLSHIFT 11 /* convert bytes to m_buf clusters */
156#endif /* MCLSHIFT */
157#define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */
158#define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */
159
160/*
161 * Some macros for units conversion
162 */
163
164/* clicks to bytes */
165#define ctob(x) ((x)<<PAGE_SHIFT)
166
167/* bytes to clicks */
168#define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT)
169
170/*
171 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We
172 * want to shift an unsigned type to avoid sign extension and we don't
173 * want to widen `bytes' unnecessarily. Assume that the result fits in
174 * a daddr_t.
175 */
176#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
177 (sizeof (bytes) > sizeof(long) \
178 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \
179 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))
180
181#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
182 ((off_t)(db) << DEV_BSHIFT)
183
184/*
185 * Mach derived conversion macros
186 */
187#define trunc_page(x) ((x) & ~PAGE_MASK)
188#define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK)
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189#define trunc_4mpage(x) ((x) & ~PDRMASK)
190#define round_4mpage(x) ((((x)) + PDRMASK) & ~PDRMASK)
984263bc 191
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192#define atop(x) ((x) >> PAGE_SHIFT)
193#define ptoa(x) ((x) << PAGE_SHIFT)
984263bc 194
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195#define i386_btop(x) ((x) >> PAGE_SHIFT)
196#define i386_ptob(x) ((x) << PAGE_SHIFT)
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197
198#define pgtok(x) ((x) * (PAGE_SIZE / 1024))
199
200#ifdef _KERNEL
201
202/*
203 * We put here the definition of two debugging macros/function which
204 * are very convenient to have available.
205 * The macro is called TSTMP() and is used to timestamp events in the
206 * kernel using the TSC register, and export them to userland through
207 * the sysctl variable debug.timestamp, which is a circular buffer
208 * holding pairs of u_int32_t variables <timestamp, argument> .
209 * They can be retrieved with something like
210 *
211 * sysctl -b debug.timestamp | hexdump -e '"%15u %15u\n"'
212 *
213 * The function _TSTMP() is defined in i386/isa/clock.c. It does not
214 * try to grab any locks or block interrupts or identify which CPU it
215 * is running on. You are supposed to know what to do if you use it.
216 *
217 * The macros must be enabled with "options KERN_TIMESTAMP" in the kernel
218 * config file, otherwise they default to an empty block.
219 */
220
221#ifdef KERN_TIMESTAMP
222extern void _TSTMP(u_int32_t argument);
223#define TSTMP(class, unit, event, par) _TSTMP( \
224 (((class) & 0x0f) << 28 ) | \
225 (((unit) & 0x0f) << 24 ) | \
226 (((event) & 0xff) << 16 ) | \
227 (((par) & 0xffff) ) )
228
229#else /* !KERN_TIMESTAMP */
230#define _TSTMP(x) {}
231#define TSTMP(class, unit, event, par) _TSTMP(0)
232#endif /* !KERN_TIMESTAMP */
233#endif /* _KERNEL */
234
984263bc 235#endif /* !_NO_NAMESPACE_POLLUTION */
85100692 236#endif /* !_MACHINE_PARAM_H_ */