1 | /*- |
---|
2 | * Copyright (c) 1982, 1986, 1989, 1993 |
---|
3 | * The Regents of the University of California. All rights reserved. |
---|
4 | * (c) UNIX System Laboratories, Inc. |
---|
5 | * All or some portions of this file are derived from material licensed |
---|
6 | * to the University of California by American Telephone and Telegraph |
---|
7 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with |
---|
8 | * the permission of UNIX System Laboratories, Inc. |
---|
9 | * |
---|
10 | * Redistribution and use in source and binary forms, with or without |
---|
11 | * modification, are permitted provided that the following conditions |
---|
12 | * are met: |
---|
13 | * 1. Redistributions of source code must retain the above copyright |
---|
14 | * notice, this list of conditions and the following disclaimer. |
---|
15 | * 2. Redistributions in binary form must reproduce the above copyright |
---|
16 | * notice, this list of conditions and the following disclaimer in the |
---|
17 | * documentation and/or other materials provided with the distribution. |
---|
18 | * 3. All advertising materials mentioning features or use of this software |
---|
19 | * must display the following acknowledgement: |
---|
20 | * This product includes software developed by the University of |
---|
21 | * California, Berkeley and its contributors. |
---|
22 | * 4. Neither the name of the University nor the names of its contributors |
---|
23 | * may be used to endorse or promote products derived from this software |
---|
24 | * without specific prior written permission. |
---|
25 | * |
---|
26 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
---|
27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
---|
28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
---|
29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
---|
30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
---|
31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
---|
32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
---|
33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
---|
34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
---|
35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
---|
36 | * SUCH DAMAGE. |
---|
37 | * |
---|
38 | * @(#)param.h 8.3 (Berkeley) 4/4/95 |
---|
39 | * $Id$ |
---|
40 | */ |
---|
41 | |
---|
42 | #ifndef _SYS_PARAM_H_ |
---|
43 | #define _SYS_PARAM_H_ |
---|
44 | |
---|
45 | #include <unistd.h> |
---|
46 | |
---|
47 | #define BSD 199506 /* System version (year & month). */ |
---|
48 | #define BSD4_3 1 |
---|
49 | #define BSD4_4 1 |
---|
50 | |
---|
51 | #ifndef NULL |
---|
52 | #define NULL 0 |
---|
53 | #endif |
---|
54 | |
---|
55 | #ifndef LOCORE |
---|
56 | #include <sys/types.h> |
---|
57 | #endif |
---|
58 | |
---|
59 | /* |
---|
60 | * Machine-independent constants (some used in following include files). |
---|
61 | * Redefined constants are from POSIX 1003.1 limits file. |
---|
62 | * |
---|
63 | * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>) |
---|
64 | * MAXLOGNAME should be >= UT_NAMESIZE (see <utmp.h>) |
---|
65 | */ |
---|
66 | #include <sys/syslimits.h> |
---|
67 | |
---|
68 | #define MAXCOMLEN 16 /* max command name remembered */ |
---|
69 | #define MAXINTERP 32 /* max interpreter file name length */ |
---|
70 | #define MAXLOGNAME 12 /* max login name length */ |
---|
71 | #define MAXUPRC CHILD_MAX /* max simultaneous processes */ |
---|
72 | #define NCARGS ARG_MAX /* max bytes for an exec function */ |
---|
73 | #define NGROUPS NGROUPS_MAX /* max number groups */ |
---|
74 | #define NOFILE OPEN_MAX /* max open files per process */ |
---|
75 | #define NOGROUP 65535 /* marker for empty group set member */ |
---|
76 | #define MAXHOSTNAMELEN 256 /* max hostname size */ |
---|
77 | |
---|
78 | /* More types and definitions used throughout the kernel. */ |
---|
79 | #ifdef KERNEL |
---|
80 | #include <sys/cdefs.h> |
---|
81 | #include <sys/errno.h> |
---|
82 | #include <sys/time.h> |
---|
83 | #include <sys/resource.h> |
---|
84 | #include <sys/ucred.h> |
---|
85 | #include <sys/uio.h> |
---|
86 | #include <sys/rtprio.h> |
---|
87 | |
---|
88 | #ifndef FALSE |
---|
89 | #define FALSE 0 |
---|
90 | #endif |
---|
91 | #ifndef TRUE |
---|
92 | #define TRUE 1 |
---|
93 | #endif |
---|
94 | #endif |
---|
95 | |
---|
96 | /* Signals. */ |
---|
97 | #include <sys/signal.h> |
---|
98 | |
---|
99 | /* Machine type dependent parameters. */ |
---|
100 | #include <machine/param.h> |
---|
101 | #include <machine/limits.h> |
---|
102 | |
---|
103 | /* |
---|
104 | * Priorities. Note that with 32 run queues, differences less than 4 are |
---|
105 | * insignificant. |
---|
106 | */ |
---|
107 | #define PSWP 0 |
---|
108 | #define PVM 4 |
---|
109 | #define PINOD 8 |
---|
110 | #define PRIBIO 16 |
---|
111 | #define PVFS 20 |
---|
112 | #define PZERO 22 /* No longer magic, shouldn't be here. XXX */ |
---|
113 | #define PSOCK 24 |
---|
114 | #define PWAIT 32 |
---|
115 | #define PLOCK 36 |
---|
116 | #define PPAUSE 40 |
---|
117 | #define PUSER 50 |
---|
118 | #define MAXPRI 127 /* Priorities range from 0 through MAXPRI. */ |
---|
119 | |
---|
120 | #define PRIMASK 0x0ff |
---|
121 | #define PCATCH 0x100 /* OR'd with pri for tsleep to check signals */ |
---|
122 | |
---|
123 | #define NZERO 0 /* default "nice" */ |
---|
124 | |
---|
125 | #define NBPW sizeof(int) /* number of bytes per word (integer) */ |
---|
126 | |
---|
127 | #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */ |
---|
128 | #define NODEV (dev_t)(-1) /* non-existent device */ |
---|
129 | |
---|
130 | /* |
---|
131 | * Clustering of hardware pages on machines with ridiculously small |
---|
132 | * page sizes is done here. The paging subsystem deals with units of |
---|
133 | * CLSIZE pte's describing PAGE_SIZE (from machine/machparam.h) pages each. |
---|
134 | */ |
---|
135 | #if 0 |
---|
136 | #define CLBYTES (CLSIZE*PAGE_SIZE) |
---|
137 | #endif |
---|
138 | |
---|
139 | #define CBLOCK 128 /* Clist block size, must be a power of 2. */ |
---|
140 | #define CBQSIZE (CBLOCK/NBBY) /* Quote bytes/cblock - can do better. */ |
---|
141 | /* Data chars/clist. */ |
---|
142 | #define CBSIZE (CBLOCK - sizeof(struct cblock *) - CBQSIZE) |
---|
143 | #define CROUND (CBLOCK - 1) /* Clist rounding. */ |
---|
144 | |
---|
145 | /* |
---|
146 | * File system parameters and macros. |
---|
147 | * |
---|
148 | * The file system is made out of blocks of at most MAXBSIZE units, with |
---|
149 | * smaller units (fragments) only in the last direct block. MAXBSIZE |
---|
150 | * primarily determines the size of buffers in the buffer pool. It may be |
---|
151 | * made larger without any effect on existing file systems; however making |
---|
152 | * it smaller make make some file systems unmountable. Also, MAXBSIZE |
---|
153 | * must be less than MAXPHYS!!! DFLTBSIZE is the average amount of |
---|
154 | * memory allocated by vfs_bio per nbuf. BKVASIZE is the average amount |
---|
155 | * of kernel virtual space allocated per nbuf. BKVASIZE should be >= |
---|
156 | * DFLTBSIZE. If it is significantly bigger than DFLTBSIZE, then |
---|
157 | * kva fragmentation causes fewer performance problems. |
---|
158 | */ |
---|
159 | #define MAXBSIZE 65536 |
---|
160 | #define BKVASIZE 8192 |
---|
161 | #define DFLTBSIZE 4096 |
---|
162 | #define MAXFRAG 8 |
---|
163 | |
---|
164 | /* |
---|
165 | * MAXPATHLEN defines the longest permissible path length after expanding |
---|
166 | * symbolic links. It is used to allocate a temporary buffer from the buffer |
---|
167 | * pool in which to do the name expansion, hence should be a power of two, |
---|
168 | * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the |
---|
169 | * maximum number of symbolic links that may be expanded in a path name. |
---|
170 | * It should be set high enough to allow all legitimate uses, but halt |
---|
171 | * infinite loops reasonably quickly. |
---|
172 | */ |
---|
173 | #if !defined(__rtems__) |
---|
174 | #define MAXPATHLEN PATH_MAX |
---|
175 | #endif |
---|
176 | #define MAXSYMLINKS 32 |
---|
177 | |
---|
178 | /* Bit map related macros. */ |
---|
179 | #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) |
---|
180 | #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) |
---|
181 | #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) |
---|
182 | #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) |
---|
183 | |
---|
184 | /* Macros for counting and rounding. */ |
---|
185 | #ifndef howmany |
---|
186 | #define howmany(x, y) (((x)+((y)-1))/(y)) |
---|
187 | #endif |
---|
188 | #define rounddown(x, y) (((x)/(y))*(y)) |
---|
189 | #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */ |
---|
190 | #define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */ |
---|
191 | #define powerof2(x) ((((x)-1)&(x))==0) |
---|
192 | |
---|
193 | /* Macros for min/max. */ |
---|
194 | #ifndef KERNEL |
---|
195 | #define MIN(a,b) (((a)<(b))?(a):(b)) |
---|
196 | #define MAX(a,b) (((a)>(b))?(a):(b)) |
---|
197 | #endif |
---|
198 | |
---|
199 | /* |
---|
200 | * Constants for setting the parameters of the kernel memory allocator. |
---|
201 | * |
---|
202 | * 2 ** MINBUCKET is the smallest unit of memory that will be |
---|
203 | * allocated. It must be at least large enough to hold a pointer. |
---|
204 | * |
---|
205 | * Units of memory less or equal to MAXALLOCSAVE will permanently |
---|
206 | * allocate physical memory; requests for these size pieces of |
---|
207 | * memory are quite fast. Allocations greater than MAXALLOCSAVE must |
---|
208 | * always allocate and free physical memory; requests for these |
---|
209 | * size allocations should be done infrequently as they will be slow. |
---|
210 | * |
---|
211 | * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and |
---|
212 | * MAXALLOCSIZE must be a power of two. |
---|
213 | */ |
---|
214 | #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */ |
---|
215 | #define MAXALLOCSAVE (2 * PAGE_SIZE) |
---|
216 | |
---|
217 | /* |
---|
218 | * Scale factor for scaled integers used to count %cpu time and load avgs. |
---|
219 | * |
---|
220 | * The number of CPU `tick's that map to a unique `%age' can be expressed |
---|
221 | * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that |
---|
222 | * can be calculated (assuming 32 bits) can be closely approximated using |
---|
223 | * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). |
---|
224 | * |
---|
225 | * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', |
---|
226 | * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. |
---|
227 | */ |
---|
228 | #define FSHIFT 11 /* bits to right of fixed binary point */ |
---|
229 | #define FSCALE (1<<FSHIFT) |
---|
230 | |
---|
231 | #endif /* _SYS_PARAM_H_ */ |
---|