kernel: Make SMP support default (and non-optional).
[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 $
38 */
39
a9295349 40#ifndef _CPU_PARAM_H_
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41
42/*
43 * Do not prevent re-includes of <machine/param.h> if the file was included
44 * with NO_NAMESPACE_POLLUTION, or expected macros will not exist.
45 */
46#ifndef _NO_NAMESPACE_POLLUTION
a9295349 47#define _CPU_PARAM_H_
6168d606 48#endif
85100692 49
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50/*
51 * Machine dependent constants for Intel 386.
52 */
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53#ifndef _CPU_PARAM_H1_
54#define _CPU_PARAM_H1_
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55
56/*
57 * Round p (pointer or byte index) up to a correctly-aligned value
58 * for all data types (int, long, ...). The result is unsigned int
59 * and must be cast to any desired pointer type.
60 */
61#ifndef _ALIGNBYTES
62#define _ALIGNBYTES (sizeof(int) - 1)
63#endif
64#ifndef _ALIGN
65#define _ALIGN(p) (((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
66#endif
67
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68#ifndef _MACHINE
69#define _MACHINE i386 /* cpu architecture */
70#endif
984263bc 71#ifndef _MACHINE_ARCH
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72#define _MACHINE_ARCH i386 /* cpu architecture */
73#endif
984263bc 74
a9295349 75#endif /* _CPU_PARAM_H1_ */
6168d606 76
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77#ifndef _NO_NAMESPACE_POLLUTION
78
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79#ifndef MACHINE
80#define MACHINE "i386" /* cpu architecture */
81#endif
984263bc 82#ifndef MACHINE_ARCH
a9295349 83#define MACHINE_ARCH "i386" /* cpu architecture */
984263bc 84#endif
a9295349 85
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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.
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91 *
92 * NOTE: Max supported cpus is 32 because we use 32 bit cpu masks.
bba6a44d 93 */
057f0718 94#ifndef SMP_MAXCPU
bba6a44d 95#define SMP_MAXCPU 16
057f0718 96#endif
bba6a44d 97#define MAXCPU SMP_MAXCPU
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98
99#define ALIGNBYTES _ALIGNBYTES
100#define ALIGN(p) _ALIGN(p)
101
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102#define PAGE_SHIFT 12
103#define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes per mmu page (level 2) */
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104#define PAGE_MASK (PAGE_SIZE-1)
105#define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t)))
106
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107#define SEG_SHIFT 22
108#define SEG_SIZE (1<<SEG_SHIFT) /* bytes per mmu segment (level 1) */
109#define SEG_MASK (SEG_SIZE-1)
110
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111#define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t)))
112#define PDRSHIFT 22 /* LOG2(NBPDR) */
113#define NBPDR (1<<PDRSHIFT) /* bytes/page dir */
114#define PDRMASK (NBPDR-1)
115
116#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
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117#define DEV_BSIZE (1 << DEV_BSHIFT)
118#define DEV_BMASK (DEV_BSIZE - 1)
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119
120#ifndef BLKDEV_IOSIZE
121#define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */
122#endif
1743f68f 123#define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */
984263bc 124#define MAXPHYS (128 * 1024) /* max raw I/O transfer size */
d83666e0 125#define MAXDUMPPGS (MAXPHYS/PAGE_SIZE)
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126
127#define IOPAGES 2 /* pages of i/o permission bitmap */
e40cfbd7 128#define UPAGES 4 /* pages of u-area */
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129
130/*
131 * Ceiling on amount of swblock kva space, can be changed via
132 * kern.maxswzone /boot/loader.conf variable.
133 */
134#ifndef VM_SWZONE_SIZE_MAX
135#define VM_SWZONE_SIZE_MAX (32 * 1024 * 1024)
136#endif
137
138/*
139 * Ceiling on size of buffer cache (really only effects write queueing,
140 * the VM page cache is not effected), can be changed via
141 * kern.maxbcache /boot/loader.conf variable.
142 */
143#ifndef VM_BCACHE_SIZE_MAX
144#define VM_BCACHE_SIZE_MAX (200 * 1024 * 1024)
145#endif
146
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147/*
148 * Some macros for units conversion
149 */
150
151/* clicks to bytes */
152#define ctob(x) ((x)<<PAGE_SHIFT)
153
154/* bytes to clicks */
155#define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT)
156
157/*
158 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We
159 * want to shift an unsigned type to avoid sign extension and we don't
160 * want to widen `bytes' unnecessarily. Assume that the result fits in
161 * a daddr_t.
162 */
163#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
164 (sizeof (bytes) > sizeof(long) \
165 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \
166 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))
167
168#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
169 ((off_t)(db) << DEV_BSHIFT)
170
171/*
172 * Mach derived conversion macros
173 */
174#define trunc_page(x) ((x) & ~PAGE_MASK)
175#define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK)
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176#define trunc_4mpage(x) ((x) & ~PDRMASK)
177#define round_4mpage(x) ((((x)) + PDRMASK) & ~PDRMASK)
984263bc 178
790ddd7b 179#if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
6ef943a3 180#define atop(x) ((x) >> PAGE_SHIFT)
790ddd7b 181#endif
f9ab53b8 182#define ptoa(x) ((vm_paddr_t)(x) << PAGE_SHIFT)
984263bc 183
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184#define i386_btop(x) ((vm_pindex_t)((x) >> PAGE_SHIFT))
185#define i386_ptob(x) ((vm_paddr_t)(x) << PAGE_SHIFT)
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186
187#define pgtok(x) ((x) * (PAGE_SIZE / 1024))
188
189#ifdef _KERNEL
190
191/*
192 * We put here the definition of two debugging macros/function which
193 * are very convenient to have available.
194 * The macro is called TSTMP() and is used to timestamp events in the
195 * kernel using the TSC register, and export them to userland through
196 * the sysctl variable debug.timestamp, which is a circular buffer
197 * holding pairs of u_int32_t variables <timestamp, argument> .
198 * They can be retrieved with something like
199 *
200 * sysctl -b debug.timestamp | hexdump -e '"%15u %15u\n"'
201 *
202 * The function _TSTMP() is defined in i386/isa/clock.c. It does not
203 * try to grab any locks or block interrupts or identify which CPU it
204 * is running on. You are supposed to know what to do if you use it.
205 *
206 * The macros must be enabled with "options KERN_TIMESTAMP" in the kernel
207 * config file, otherwise they default to an empty block.
208 */
209
210#ifdef KERN_TIMESTAMP
211extern void _TSTMP(u_int32_t argument);
212#define TSTMP(class, unit, event, par) _TSTMP( \
213 (((class) & 0x0f) << 28 ) | \
214 (((unit) & 0x0f) << 24 ) | \
215 (((event) & 0xff) << 16 ) | \
216 (((par) & 0xffff) ) )
217
218#else /* !KERN_TIMESTAMP */
219#define _TSTMP(x) {}
220#define TSTMP(class, unit, event, par) _TSTMP(0)
221#endif /* !KERN_TIMESTAMP */
222#endif /* _KERNEL */
223
984263bc 224#endif /* !_NO_NAMESPACE_POLLUTION */
a9295349 225#endif /* !_CPU_PARAM_H_ */