| 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 | * $FreeBSD: src/sys/sys/param.h,v 1.61.2.38 2003/05/22 17:12:01 fjoe Exp $ |
| 40 | * $DragonFly: src/sys/sys/param.h,v 1.53 2008/11/11 00:55:49 pavalos Exp $ |
| 41 | */ |
| 42 | |
| 43 | #ifndef _SYS_PARAM_H_ |
| 44 | #define _SYS_PARAM_H_ |
| 45 | |
| 46 | #define BSD 200708 /* XXX kern.osrevision */ |
| 47 | #define BSD4_3 1 /* XXX obsolete */ |
| 48 | #define BSD4_4 1 /* XXX obsolete */ |
| 49 | |
| 50 | /* |
| 51 | * __DragonFly_version number. The number doesn't really meaningfully |
| 52 | * translate to a version number. |
| 53 | * |
| 54 | * 170000 - base development version after 1.6 branch |
| 55 | * 170001 - base development version before 1.8 branch |
| 56 | * 190000 - base development version after 1.8 branch |
| 57 | * 195000 - base development version after 1.10 branch |
| 58 | * 197500 - base development version before 1.12 branch |
| 59 | * 197600 - 1.12 branch |
| 60 | * 197700 - base development version after 1.12 branch |
| 61 | * 199900 - base development version before 2.0 branch |
| 62 | * 200000 - 2.0 branch |
| 63 | * 200100 - base development version after 2.0 branch |
| 64 | * 200101 - lchflags syscall |
| 65 | * 200200 - 2.2 branch |
| 66 | * 200201 - base development version after 2.2 branch |
| 67 | * 200202 - major changes to libc |
| 68 | * 200203 - introduce PCI domain |
| 69 | * 200204 - suser() & suser_cred() removal |
| 70 | * 200205 - devfs import |
| 71 | * 200206 - *sleep() renames |
| 72 | * 200400 - 2.4 branch |
| 73 | * 200500 - 2.5 master |
| 74 | * 200600 - 2.6 branch |
| 75 | * 200700 - 2.7 master |
| 76 | */ |
| 77 | #undef __DragonFly_version |
| 78 | #define __DragonFly_version 200700 /* propagated to newvers */ |
| 79 | |
| 80 | #ifdef __FreeBSD__ |
| 81 | /* |
| 82 | * __FreeBSD_version numbers for source compatibility. This is temporary |
| 83 | * along with the __FreeBSD__ define in gcc2. Note that gcc3 does not |
| 84 | * define __FreeBSD__ by default, only __DragonFly__. |
| 85 | */ |
| 86 | #undef __FreeBSD_version |
| 87 | #define __FreeBSD_version 480101 |
| 88 | #endif |
| 89 | |
| 90 | #include <sys/_null.h> |
| 91 | |
| 92 | #ifndef LOCORE |
| 93 | #include <sys/types.h> |
| 94 | #endif |
| 95 | |
| 96 | /* |
| 97 | * Machine-independent constants (some used in following include files). |
| 98 | * Redefined constants are from POSIX 1003.1 limits file. |
| 99 | * |
| 100 | * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>) |
| 101 | * MAXLOGNAME should be == UT_NAMESIZE+1 (see <utmp.h>) |
| 102 | */ |
| 103 | #include <sys/syslimits.h> |
| 104 | |
| 105 | #define MAXCOMLEN 16 /* max command name remembered */ |
| 106 | #define MAXINTERP 32 /* max interpreter file name length */ |
| 107 | #define MAXLOGNAME 17 /* max login name length (incl. NUL) */ |
| 108 | #define MAXUPRC CHILD_MAX /* max simultaneous processes */ |
| 109 | #define NCARGS ARG_MAX /* max bytes for an exec function */ |
| 110 | #define NGROUPS NGROUPS_MAX /* max number groups */ |
| 111 | #define NOFILE OPEN_MAX /* max open files per process */ |
| 112 | #define NOGROUP 65535 /* marker for empty group set member */ |
| 113 | #define MAXHOSTNAMELEN 256 /* max hostname size */ |
| 114 | |
| 115 | /* More types and definitions used throughout the kernel. */ |
| 116 | #ifdef _KERNEL |
| 117 | #include <sys/cdefs.h> |
| 118 | #include <sys/errno.h> |
| 119 | #include <sys/time.h> |
| 120 | |
| 121 | #define FALSE 0 |
| 122 | #define TRUE 1 |
| 123 | #endif |
| 124 | |
| 125 | #ifndef _KERNEL |
| 126 | /* Signals. */ |
| 127 | #include <sys/select.h> |
| 128 | #include <sys/signal.h> |
| 129 | #endif |
| 130 | |
| 131 | /* Machine type dependent parameters. */ |
| 132 | #include <machine/param.h> |
| 133 | #ifndef _KERNEL |
| 134 | #include <machine/limits.h> |
| 135 | #endif |
| 136 | |
| 137 | #define PCATCH 0x00000100 /* tsleep checks signals */ |
| 138 | #define PUSRFLAG1 0x00000200 /* Subsystem specific flag */ |
| 139 | #define PINTERLOCKED 0x00000400 /* Interlocked tsleep */ |
| 140 | #define PWAKEUP_CPUMASK 0x00003FFF /* start cpu for chained wakeups */ |
| 141 | #define PWAKEUP_MYCPU 0x00004000 /* wakeup on current cpu only */ |
| 142 | #define PWAKEUP_ONE 0x00008000 /* argument to wakeup: only one */ |
| 143 | #define PDOMAIN_MASK 0xFFFF0000 /* address domains for wakeup */ |
| 144 | #define PDOMAIN_UMTX 0x00010000 /* independant domain for UMTX */ |
| 145 | #define PWAKEUP_ENCODE(domain, cpu) ((domain) | (cpu)) |
| 146 | #define PWAKEUP_DECODE(domain) ((domain) & PWAKEUP_CPUMASK) |
| 147 | |
| 148 | #define NZERO 0 /* default "nice" */ |
| 149 | |
| 150 | #define NBPW sizeof(int) /* number of bytes per word (integer) */ |
| 151 | |
| 152 | #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */ |
| 153 | #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) |
| 154 | #define NOUDEV (udev_t)(-1) /* non-existent device */ |
| 155 | #define NOMAJ 256 /* non-existent device */ |
| 156 | #endif |
| 157 | |
| 158 | #ifndef _KERNEL |
| 159 | #define NODEV (dev_t)(-1) /* non-existent device */ |
| 160 | #endif |
| 161 | |
| 162 | /* |
| 163 | * File system parameters and macros. |
| 164 | * |
| 165 | * MAXBSIZE - Filesystems are made out of blocks of at most MAXBSIZE bytes |
| 166 | * per block. MAXBSIZE may be made larger without effecting |
| 167 | * any existing filesystems as long as it does not exceed MAXPHYS, |
| 168 | * and may be made smaller at the risk of not being able to use |
| 169 | * filesystems which require a block size exceeding MAXBSIZE. |
| 170 | * |
| 171 | * BKVASIZE - Nominal buffer space per buffer, in bytes. BKVASIZE is the |
| 172 | * minimum KVM memory reservation the kernel is willing to make. |
| 173 | * Filesystems can of course request smaller chunks. Actual |
| 174 | * backing memory uses a chunk size of a page (PAGE_SIZE). |
| 175 | * |
| 176 | * If you make BKVASIZE too small you risk seriously fragmenting |
| 177 | * the buffer KVM map which may slow things down a bit. If you |
| 178 | * make it too big the kernel will not be able to optimally use |
| 179 | * the KVM memory reserved for the buffer cache and will wind |
| 180 | * up with too-few buffers. |
| 181 | * |
| 182 | * The default is 16384, roughly 2x the block size used by a |
| 183 | * normal UFS filesystem. |
| 184 | */ |
| 185 | #define MAXBSIZE 65536 /* must be power of 2 */ |
| 186 | #define BKVASIZE 16384 /* must be power of 2 */ |
| 187 | #define BKVAMASK (BKVASIZE-1) |
| 188 | #define MAXFRAG 8 |
| 189 | |
| 190 | /* |
| 191 | * MAXPATHLEN defines the longest permissible path length after expanding |
| 192 | * symbolic links. It is used to allocate a temporary buffer from the buffer |
| 193 | * pool in which to do the name expansion, hence should be a power of two, |
| 194 | * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the |
| 195 | * maximum number of symbolic links that may be expanded in a path name. |
| 196 | * It should be set high enough to allow all legitimate uses, but halt |
| 197 | * infinite loops reasonably quickly. |
| 198 | */ |
| 199 | #define MAXPATHLEN PATH_MAX |
| 200 | #define MAXSYMLINKS 32 |
| 201 | |
| 202 | /* Bit map related macros. */ |
| 203 | #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) |
| 204 | #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) |
| 205 | #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) |
| 206 | #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) |
| 207 | |
| 208 | /* Macros for counting and rounding. */ |
| 209 | #ifndef howmany |
| 210 | #define howmany(x, y) (((x)+((y)-1))/(y)) |
| 211 | #endif |
| 212 | #define rounddown(x, y) (((x)/(y))*(y)) |
| 213 | #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */ |
| 214 | #define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */ |
| 215 | #define powerof2(x) ((((x)-1)&(x))==0) |
| 216 | |
| 217 | /* |
| 218 | * VM objects can be larger than the virtual address space, make sure |
| 219 | * we don't cut-off the mask. |
| 220 | */ |
| 221 | #define trunc_page64(x) ((x) & ~(int64_t)PAGE_MASK) |
| 222 | #define round_page64(x) (((x) + PAGE_MASK) & ~(int64_t)PAGE_MASK) |
| 223 | |
| 224 | /* Macros for min/max. */ |
| 225 | #define MIN(a,b) (((a)<(b))?(a):(b)) |
| 226 | #define MAX(a,b) (((a)>(b))?(a):(b)) |
| 227 | |
| 228 | /* |
| 229 | * Constants for setting the parameters of the kernel memory allocator. |
| 230 | * |
| 231 | * 2 ** MINBUCKET is the smallest unit of memory that will be |
| 232 | * allocated. It must be at least large enough to hold a pointer. |
| 233 | * |
| 234 | * Units of memory less or equal to MAXALLOCSAVE will permanently |
| 235 | * allocate physical memory; requests for these size pieces of |
| 236 | * memory are quite fast. Allocations greater than MAXALLOCSAVE must |
| 237 | * always allocate and free physical memory; requests for these |
| 238 | * size allocations should be done infrequently as they will be slow. |
| 239 | * |
| 240 | * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and |
| 241 | * MAXALLOCSIZE must be a power of two. |
| 242 | */ |
| 243 | #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */ |
| 244 | #define MAXALLOCSAVE (2 * PAGE_SIZE) |
| 245 | |
| 246 | /* |
| 247 | * Scale factor for scaled integers used to count %cpu time and load avgs. |
| 248 | * |
| 249 | * The number of CPU `tick's that map to a unique `%age' can be expressed |
| 250 | * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that |
| 251 | * can be calculated (assuming 32 bits) can be closely approximated using |
| 252 | * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). |
| 253 | * |
| 254 | * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', |
| 255 | * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. |
| 256 | */ |
| 257 | #define FSHIFT 11 /* bits to right of fixed binary point */ |
| 258 | #define FSCALE (1<<FSHIFT) |
| 259 | |
| 260 | #define dbtoc(db) /* calculates devblks to pages */ \ |
| 261 | ((db + (ctodb(1) - 1)) >> (PAGE_SHIFT - DEV_BSHIFT)) |
| 262 | |
| 263 | #define ctodb(db) /* calculates pages to devblks */ \ |
| 264 | ((db) << (PAGE_SHIFT - DEV_BSHIFT)) |
| 265 | |
| 266 | #define MJUMPAGESIZE PAGE_SIZE /* jumbo cluster 4k */ |
| 267 | #define MJUM9BYTES (9 * 1024) /* jumbo cluster 9k */ |
| 268 | #define MJUM16BYTES (16 * 1024) /* jumbo cluster 16k */ |
| 269 | /* |
| 270 | * Make this available for most of the kernel. There were too many |
| 271 | * things that included sys/systm.h just for panic(). |
| 272 | */ |
| 273 | #ifdef _KERNEL |
| 274 | void panic (const char *, ...) __dead2 __printflike(1, 2); |
| 275 | #endif |
| 276 | |
| 277 | #ifndef htonl |
| 278 | #define htonl(x) __htonl(x) |
| 279 | #endif |
| 280 | #ifndef htons |
| 281 | #define htons(x) __htons(x) |
| 282 | #endif |
| 283 | #ifndef ntohl |
| 284 | #define ntohl(x) __ntohl(x) |
| 285 | #endif |
| 286 | #ifndef ntohs |
| 287 | #define ntohs(x) __ntohs(x) |
| 288 | #endif |
| 289 | |
| 290 | #endif /* _SYS_PARAM_H_ */ |