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 * $FreeBSD$
38 */
39
40 /*
41 * Machine dependent constants for Intel 386.
42 */
43
44 /*
45 * Round p (pointer or byte index) up to a correctly-aligned value
46 * for all data types (int, long, ...). The result is unsigned int
47 * and must be cast to any desired pointer type.
48 */
49 #ifndef _ALIGNBYTES
50 #define _ALIGNBYTES (sizeof(int) - 1)
51 #endif
52 #ifndef _ALIGN
53 #define _ALIGN(p) (((unsigned)(p) + _ALIGNBYTES) & ~_ALIGNBYTES)
54 #endif
55
56 #ifndef _MACHINE
57 #define _MACHINE i386
58 #endif
59 #ifndef _MACHINE_ARCH
60 #define _MACHINE_ARCH i386
61 #endif
62
63 #ifndef _NO_NAMESPACE_POLLUTION
64
65 #ifndef _MACHINE_PARAM_H_
66 #define _MACHINE_PARAM_H_
67
68 #ifndef MACHINE
69 #define MACHINE "i386"
70 #endif
71 #ifndef MACHINE_ARCH
72 #define MACHINE_ARCH "i386"
73 #endif
74 #define MID_MACHINE MID_I386
75
76 /*
77 * OBJFORMAT_NAMES is a comma-separated list of the object formats
78 * that are supported on the architecture.
79 */
80 #define OBJFORMAT_NAMES "elf", "aout"
81 #define OBJFORMAT_DEFAULT "elf"
82
83 #ifdef SMP
84 #define MAXCPU 16
85 #else
86 #define MAXCPU 1
87 #endif /* SMP */
88
89 #define ALIGNBYTES _ALIGNBYTES
90 #define ALIGN(p) _ALIGN(p)
91
92 #define PAGE_SHIFT 12 /* LOG2(PAGE_SIZE) */
93 #define PAGE_SIZE (1<<PAGE_SHIFT) /* bytes/page */
94 #define PAGE_MASK (PAGE_SIZE-1)
95 #define NPTEPG (PAGE_SIZE/(sizeof (pt_entry_t)))
96
97 #ifdef PAE
98 #define NPGPTD 4
99 #define PDRSHIFT 21 /* LOG2(NBPDR) */
100 #else
101 #define NPGPTD 1
102 #define PDRSHIFT 22 /* LOG2(NBPDR) */
103 #endif
104
105 #define NBPDR (1<<PDRSHIFT) /* bytes/page dir */
106 #define PDRMASK (NBPDR-1)
107 #define NPDEPG (PAGE_SIZE/(sizeof (pd_entry_t)))
108 #define NPDEPTD (NPDEPG*NPGPTD)
109
110 #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
111 #define DEV_BSIZE (1<<DEV_BSHIFT)
112
113 #ifndef BLKDEV_IOSIZE
114 #define BLKDEV_IOSIZE PAGE_SIZE /* default block device I/O size */
115 #endif
116 #define DFLTPHYS (64 * 1024) /* default max raw I/O transfer size */
117 #define MAXPHYS (128 * 1024) /* max raw I/O transfer size */
118 #define MAXDUMPPGS (DFLTPHYS/PAGE_SIZE)
119
120 #define IOPAGES 2 /* pages of i/o permission bitmap */
121 #define UPAGES 3 /* pages of u-area */
122
123 /*
124 * Ceiling on amount of swblock kva space, can be changed via
125 * kern.maxswzone /boot/loader.conf variable.
126 */
127 #ifndef VM_SWZONE_SIZE_MAX
128 #define VM_SWZONE_SIZE_MAX (32 * 1024 * 1024)
129 #endif
130
131 /*
132 * Ceiling on size of buffer cache (really only effects write queueing,
133 * the VM page cache is not effected), can be changed via
134 * kern.maxbcache /boot/loader.conf variable.
135 */
136 #ifndef VM_BCACHE_SIZE_MAX
137 #define VM_BCACHE_SIZE_MAX (200 * 1024 * 1024)
138 #endif
139
140
141 /*
142 * Constants related to network buffer management.
143 * MCLBYTES must be no larger than CLBYTES (the software page size), and,
144 * on machines that exchange pages of input or output buffers with mbuf
145 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
146 * of the hardware page size.
147 */
148 #ifndef MSIZE
149 #define MSIZE 256 /* size of an mbuf */
150 #endif /* MSIZE */
151
152 #ifndef MCLSHIFT
153 #define MCLSHIFT 11 /* convert bytes to m_buf clusters */
154 #endif /* MCLSHIFT */
155 #define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */
156 #define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */
157
158 /*
159 * Some macros for units conversion
160 */
161
162 /* clicks to bytes */
163 #define ctob(x) ((x)<<PAGE_SHIFT)
164
165 /* bytes to clicks */
166 #define btoc(x) (((unsigned)(x)+PAGE_MASK)>>PAGE_SHIFT)
167
168 /*
169 * btodb() is messy and perhaps slow because `bytes' may be an off_t. We
170 * want to shift an unsigned type to avoid sign extension and we don't
171 * want to widen `bytes' unnecessarily. Assume that the result fits in
172 * a daddr_t.
173 */
174 #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
175 (sizeof (bytes) > sizeof(long) \
176 ? (daddr_t)((unsigned long long)(bytes) >> DEV_BSHIFT) \
177 : (daddr_t)((unsigned long)(bytes) >> DEV_BSHIFT))
178
179 #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
180 ((off_t)(db) << DEV_BSHIFT)
181
182 /*
183 * Mach derived conversion macros
184 */
185 #define trunc_page(x) ((x) & ~PAGE_MASK)
186 #define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK)
187 #define trunc_4mpage(x) ((x) & ~PDRMASK)
188 #define round_4mpage(x) ((((x)) + PDRMASK) & ~PDRMASK)
189
190 #define atop(x) ((x) >> PAGE_SHIFT)
191 #define ptoa(x) ((x) << PAGE_SHIFT)
192
193 #define i386_btop(x) ((x) >> PAGE_SHIFT)
194 #define i386_ptob(x) ((x) << PAGE_SHIFT)
195
196 #define pgtok(x) ((x) * (PAGE_SIZE / 1024))
197
198 #ifdef _KERNEL
199
200 /*
201 * We put here the definition of two debugging macros/function which
202 * are very convenient to have available.
203 * The macro is called TSTMP() and is used to timestamp events in the
204 * kernel using the TSC register, and export them to userland through
205 * the sysctl variable debug.timestamp, which is a circular buffer
206 * holding pairs of u_int32_t variables <timestamp, argument> .
207 * They can be retrieved with something like
208 *
209 * sysctl -b debug.timestamp | hexdump -e '"%15u %15u\n"'
210 *
211 * The function _TSTMP() is defined in i386/isa/clock.c. It does not
212 * try to grab any locks or block interrupts or identify which CPU it
213 * is running on. You are supposed to know what to do if you use it.
214 *
215 * The macros must be enabled with "options KERN_TIMESTAMP" in the kernel
216 * config file, otherwise they default to an empty block.
217 */
218
219 #ifdef KERN_TIMESTAMP
220 extern void _TSTMP(u_int32_t argument);
221 #define TSTMP(class, unit, event, par) _TSTMP( \
222 (((class) & 0x0f) << 28 ) | \
223 (((unit) & 0x0f) << 24 ) | \
224 (((event) & 0xff) << 16 ) | \
225 (((par) & 0xffff) ) )
226
227 #else /* !KERN_TIMESTAMP */
228 #define _TSTMP(x) {}
229 #define TSTMP(class, unit, event, par) _TSTMP(0)
230 #endif /* !KERN_TIMESTAMP */
231 #endif /* _KERNEL */
232
233 #endif /* !_MACHINE_PARAM_H_ */
234 #endif /* !_NO_NAMESPACE_POLLUTION */
Cache object: 6646e0417df07bc61d47ee36258b5cfe
|