include/sys/param.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2014 Nexenta Systems, Inc.  All rights reserved.
  24  * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved.
  25  */
  26
  27 /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
  28 /*        All Rights Reserved   */
  29
  30 /*
  31  * University Copyright- Copyright (c) 1982, 1986, 1988
  32  * The Regents of the University of California
  33  * All Rights Reserved
  34  *
  35  * University Acknowledgment- Portions of this document are derived from
  36  * software developed by the University of California, Berkeley, and its
  37  * contributors.
  38  */
  39
  40 #ifndef _SYS_PARAM_H
  41 #define _SYS_PARAM_H
  42
  43 #ifndef _ASM            /* Avoid typedef headaches for assembly files */
  44 #include <sys/types.h>
  45 #include <sys/isa_defs.h>
  46 #endif /* _ASM */
  47
  48 #include <sys/null.h>
  49
  50 #ifdef  __cplusplus
  51 extern "C" {
  52 #endif
  53
  54 /*
  55  * Fundamental variables; don't change too often.
  56  */
  57
  58 /*
  59  * _POSIX_VDISABLE has historically been defined in <sys/param.h> since
  60  * an early merge with AT&T source.  It has also historically been defined
  61  * in <sys/termios.h>. The POSIX standard, IEEE Std. 1003.1-1988 initially
  62  * required the existence of _POSIX_VDISABLE in <sys/termios.h>.
  63  * Subsequent versions of the IEEE Standard as well as the X/Open
  64  * specifications required that _POSIX_VDISABLE be defined in <unistd.h>
  65  * while still allowing for it's existence in other headers.  With the
  66  * introduction of XPG6, _POSIX_VDISABLE can only be defined in <unistd.h>.
  67  */
  68 #if !defined(_XPG6) || defined(__EXTENSIONS__)
  69 #ifndef _POSIX_VDISABLE
  70 #define _POSIX_VDISABLE 0       /* Disable special character functions */
  71 #endif
  72 #endif /* !defined(_XPG6) || defined(__EXTENSIONS__) */
  73
  74 /* The actual size of the TTY input queue */
  75 #define _TTY_BUFSIZ     2048
  76
  77 /*
  78  * These defines all have their historical value.  The actual size of the tty
  79  * buffer both for the line-editor in ldterm, and in general, is above as
  80  * _TTY_BUFSIZ.
  81  *
  82  * We leave these defines at their historical value to match the behaviour of
  83  * BSD and Linux.
  84  */
  85 #ifndef MAX_INPUT
  86 #define MAX_INPUT       512     /* Maximum bytes stored in the input queue */
  87 #endif
  88 #ifndef MAX_CANON
  89 #define MAX_CANON       256     /* Maximum bytes for canonical processing */
  90 #endif
  91 #define CANBSIZ         256     /* max size of typewriter line  */
  92
  93
  94 #define UID_NOBODY      60001   /* user ID no body */
  95 #define GID_NOBODY      UID_NOBODY
  96 #define UID_UNKNOWN     96
  97 #define GID_UNKNOWN     UID_UNKNOWN
  98 #define UID_DLADM       15
  99 #define UID_NETADM      16
 100 #define GID_NETADM      65
 101 #define UID_NOACCESS    60002   /* user ID no access */
 102
 103 #ifdef _KERNEL
 104 #define MAX_TASKID      999999
 105 #define MAX_MAXPID      999999
 106 #define MAXEPHUID       0xfffffffcu     /* max ephemeral user id */
 107
 108 #define FAMOUS_PID_SCHED        0
 109 #define FAMOUS_PID_INIT         1
 110 #define FAMOUS_PID_PAGEOUT      2
 111 #define FAMOUS_PID_FSFLUSH      3
 112 #define FAMOUS_PIDS             4
 113 #endif
 114
 115 #ifdef DEBUG
 116 #define DEFAULT_MAXPID  999999
 117 #define DEFAULT_JUMPPID 100000
 118 #else
 119 #define DEFAULT_MAXPID  30000
 120 #define DEFAULT_JUMPPID 0
 121 #endif
 122
 123 #define MAXUID          2147483647      /* max user id */
 124
 125 #define MAXPROJID       MAXUID          /* max project id */
 126 #define MAXLINK         32767   /* max links */
 127
 128 #define MINEPHUID       0x80000000u     /* min ephemeral user id */
 129
 130 #define NMOUNT          40      /* est. of # mountable fs for quota calc */
 131
 132 #define NOFILE          20      /* this define is here for      */
 133                                 /* compatibility purposes only  */
 134                                 /* and will be removed in a     */
 135                                 /* later release                */
 136
 137 /*
 138  * These define the maximum and minimum allowable values of the
 139  * configurable parameter NGROUPS_MAX.
 140  */
 141 #define NGROUPS_UMIN    0
 142 #define NGROUPS_UMAX    1024
 143 #define NGROUPS_OLDMAX  32
 144
 145 /*
 146  * NGROUPS_MAX_DEFAULT: *MUST* match NGROUPS_MAX value in limits.h.
 147  */
 148 #define NGROUPS_MAX_DEFAULT     16
 149
 150 /*
 151  * Default process priority.  Keep it in sync with limits.h.
 152  */
 153 #define NZERO   20
 154
 155 /*
 156  * Fundamental constants of the implementation--cannot be changed easily.
 157  */
 158
 159 #define NBPW    sizeof (int)    /* number of bytes in an integer */
 160
 161 #define CMASK   022             /* default mask for file creation */
 162 #define CDLIMIT (1L<<11)        /* default max write address */
 163 #define NBPS            0x20000 /* Number of bytes per segment */
 164 #define NBPSCTR         512     /* Bytes per disk sector.       */
 165 #define UBSIZE          512     /* unix block size.             */
 166 #define SCTRSHFT        9       /* Shift for BPSECT.            */
 167
 168 #ifdef _LITTLE_ENDIAN
 169 #define lobyte(X)       (((unsigned char *)&(X))[0])
 170 #define hibyte(X)       (((unsigned char *)&(X))[1])
 171 #define loword(X)       (((ushort_t *)&(X))[0])
 172 #define hiword(X)       (((ushort_t *)&(X))[1])
 173 #endif
 174 #ifdef _BIG_ENDIAN
 175 #define lobyte(X)       (((unsigned char *)&(X))[1])
 176 #define hibyte(X)       (((unsigned char *)&(X))[0])
 177 #define loword(X)       (((ushort_t *)&(X))[1])
 178 #define hiword(X)       (((ushort_t *)&(X))[0])
 179 #endif
 180
 181 /* REMOTE -- whether machine is primary, secondary, or regular */
 182 #define SYSNAME 9               /* # chars in system name */
 183 #define PREMOTE 39
 184
 185 /*
 186  * MAXPATHLEN defines the longest permissible path length,
 187  * including the terminating null, after expanding symbolic links.
 188  * TYPICALMAXPATHLEN is used in a few places as an optimization
 189  * with a local buffer on the stack to avoid kmem_alloc().
 190  * MAXSYMLINKS defines the maximum number of symbolic links
 191  * that may be expanded in a path name. It should be set high
 192  * enough to allow all legitimate uses, but halt infinite loops
 193  * reasonably quickly.
 194  * MAXNAMELEN is the length (including the terminating null) of
 195  * the longest permissible file (component) name.
 196  */
 197 #define MAXPATHLEN      1024
 198 #define TYPICALMAXPATHLEN       64
 199 #define MAXSYMLINKS     20
 200 #define MAXNAMELEN      256
 201
 202 /*
 203  * MAXLINKNAMELEN defines the longest possible permitted datalink name,
 204  * including the terminating NUL.  Note that this must not be larger
 205  * than related networking constants such as LIFNAMSIZ.
 206  */
 207 #define MAXLINKNAMELEN  32
 208
 209 #ifndef NADDR
 210 #define NADDR 13
 211 #endif
 212
 213 /*
 214  * The following are defined to be the same as
 215  * defined in /usr/include/limits.h.  They are
 216  * needed for pipe and FIFO compatibility.
 217  */
 218 #ifndef PIPE_BUF        /* max # bytes atomic in write to a pipe */
 219 #define PIPE_BUF        5120
 220 #endif  /* PIPE_BUF */
 221
 222 #ifndef PIPE_MAX        /* max # bytes written to a pipe in a write */
 223 #define PIPE_MAX        5120
 224 #endif  /* PIPE_MAX */
 225
 226 #ifndef NBBY
 227 #define NBBY    8                       /* number of bits per byte */
 228 #endif
 229
 230 /* macros replacing interleaving functions */
 231 #define dkblock(bp)     ((bp)->b_blkno)
 232 #define dkunit(bp)      (minor((bp)->b_dev) >> 3)
 233
 234 /*
 235  * File system parameters and macros.
 236  *
 237  * The file system is made out of blocks of at most MAXBSIZE units,
 238  * with smaller units (fragments) only in the last direct block.
 239  * MAXBSIZE primarily determines the size of buffers in the buffer
 240  * pool. It may be made larger without any effect on existing
 241  * file systems; however making it smaller make make some file
 242  * systems unmountable.
 243  *
 244  * Note that the blocked devices are assumed to have DEV_BSIZE
 245  * "sectors" and that fragments must be some multiple of this size.
 246  */
 247 #define MAXBSIZE        8192
 248 #define DEV_BSIZE       512
 249 #define DEV_BSHIFT      9               /* log2(DEV_BSIZE) */
 250 #define MAXFRAG         8
 251 #ifdef  _SYSCALL32
 252 #define MAXOFF32_T      0x7fffffff
 253 #endif
 254 #ifdef  _LP64
 255 #define MAXOFF_T        0x7fffffffffffffffl
 256 #define MAXOFFSET_T     0x7fffffffffffffffl
 257 #else
 258 #define MAXOFF_T        0x7fffffffl
 259 #ifdef _LONGLONG_TYPE
 260 #define MAXOFFSET_T     0x7fffffffffffffffLL
 261 #else
 262 #define MAXOFFSET_T     0x7fffffff
 263 #endif
 264 #endif  /* _LP64 */
 265
 266 #define btodb(bytes)                    /* calculates (bytes / DEV_BSIZE) */ \
 267         ((unsigned long)(bytes) >> DEV_BSHIFT)
 268 #define dbtob(db)                       /* calculates (db * DEV_BSIZE) */ \
 269         ((unsigned long)(db) << DEV_BSHIFT)
 270
 271 /*      64 bit versions of btodb and dbtob */
 272 #define lbtodb(bytes)                   /* calculates (bytes / DEV_BSIZE) */ \
 273         ((uoff_t)(bytes) >> DEV_BSHIFT)
 274 #define ldbtob(db)                      /* calculates (db * DEV_BSIZE) */ \
 275         ((uoff_t)(db) << DEV_BSHIFT)
 276
 277 #ifndef _ASM    /* Avoid typedef headaches for assembly files */
 278 #ifndef NODEV
 279 #define NODEV   (dev_t)(-1l)
 280 #ifdef _SYSCALL32
 281 #define NODEV32 (dev32_t)(-1)
 282 #endif  /* _SYSCALL32 */
 283 #endif  /* NODEV */
 284 #endif  /* _ASM */
 285
 286 /*
 287  * Size of arg list passed in by user.
 288  */
 289 #define NCARGS32        0x100000
 290 #define NCARGS64        0x200000
 291 #ifdef  _LP64
 292 #define NCARGS          NCARGS64
 293 #else   /* _LP64 */
 294 #define NCARGS          NCARGS32
 295 #endif  /* _LP64 */
 296
 297 /*
 298  * Scale factor for scaled integers used to count
 299  * %cpu time and load averages.
 300  */
 301 #define FSHIFT  8               /* bits to right of fixed binary point */
 302 #define FSCALE  (1<<FSHIFT)
 303
 304 /*
 305  * Delay units are in microseconds.
 306  *
 307  * XXX  These macros are not part of the DDI!
 308  */
 309 #if defined(_KERNEL) && !defined(_ASM)
 310 extern void drv_usecwait(clock_t);
 311 #define DELAY(n)        drv_usecwait(n)
 312 #define CDELAY(c, n)    \
 313 { \
 314         register int N = n; \
 315         while (--N > 0) { \
 316                 if (c) \
 317                         break; \
 318                 drv_usecwait(1); \
 319         } \
 320 }
 321 #endif  /* defined(_KERNEL) && !defined(_ASM) */
 322
 323 #ifdef  __cplusplus
 324 }
 325 #endif
 326
 327 /*
 328  * The following is to free utilities from machine dependencies within
 329  * an architecture. Must be included after definition of DEV_BSIZE.
 330  */
 331
 332 #if (defined(_KERNEL) || defined(_KMEMUSER))
 333
 334 #if defined(_MACHDEP)
 335 #include <sys/machparam.h>
 336 #endif
 337
 338 #ifdef  __cplusplus
 339 extern "C" {
 340 #endif
 341
 342 #if defined(_KERNEL) && !defined(_ASM)
 343 extern int cpu_decay_factor;
 344 extern pid_t maxpid;
 345 extern pid_t jump_pid;
 346
 347 extern uintptr_t _kernelbase;
 348 extern uintptr_t _userlimit;
 349 extern uintptr_t _userlimit32;
 350 #endif  /* defined(_KERNEL) && !defined(_ASM) */
 351
 352 /*
 353  * These three variables have been added within the #if defined(lint)
 354  * below to ensure visibility to lint. This is a short term workaround
 355  * to handle poor interaction between SS12 lint and these variables.
 356  * CR 6742611 has been logged to address these issues.
 357  */
 358 #if defined(lint)
 359 extern int snooping;
 360 extern uint_t snoop_interval;
 361 extern const unsigned int _pageshift;
 362 #endif  /* lint */
 363
 364 #if !defined(_MACHDEP)
 365
 366 /*
 367  * Implementation architecture independent sections of the kernel use
 368  * this section.
 369  */
 370 #if defined(_KERNEL) && !defined(_ASM)
 371 extern int hz;
 372 extern int snooping;
 373 extern uint_t snoop_interval;
 374 extern const unsigned long _pagesize;
 375 extern const unsigned int _pageshift;
 376 extern const unsigned long _pageoffset;
 377 extern const unsigned long long _pagemask;
 378 extern const unsigned long _mmu_pagesize;
 379 extern const unsigned int _mmu_pageshift;
 380 extern const unsigned long _mmu_pageoffset;
 381 extern const unsigned long _mmu_pagemask;
 382 extern const uintptr_t _argsbase;
 383 extern const unsigned long _defaultstksz;
 384 extern const unsigned int _nbpg;
 385 extern const int _ncpu;
 386 extern const int _ncpu_log2;
 387 extern const int _ncpu_p2;
 388 extern const int _clsize;
 389 #endif  /* defined(_KERNEL) && !defined(_ASM) */
 390
 391 /* Any additions to these #defines must be reflected in mdb_param.h+mdb_ks.c */
 392 #define PAGESIZE        _pagesize
 393 #define PAGESHIFT       _pageshift
 394 #define PAGEOFFSET      _pageoffset
 395 #define PAGEMASK        _pagemask
 396 #define MMU_PAGESIZE    _mmu_pagesize
 397 #define MMU_PAGESHIFT   _mmu_pageshift
 398 #define MMU_PAGEOFFSET  _mmu_pageoffset
 399 #define MMU_PAGEMASK    _mmu_pagemask
 400
 401 #define KERNELBASE      _kernelbase
 402 #define USERLIMIT       _userlimit
 403 #define USERLIMIT32     _userlimit32
 404 #define ARGSBASE        _argsbase
 405 #define DEFAULTSTKSZ    _defaultstksz
 406 #define NCPU            _ncpu
 407 #define NCPU_LOG2       _ncpu_log2
 408 #define NCPU_P2         _ncpu_p2
 409
 410 #endif  /* defined(_MACHDEP) */
 411
 412 /*
 413  * Some random macros for units conversion.
 414  *
 415  * These are machine independent but contain constants (*PAGESHIFT) which
 416  * are only defined in the machine dependent file.
 417  */
 418
 419 /*
 420  * MMU pages to bytes, and back (with and without rounding)
 421  */
 422 #define mmu_ptob(x)     ((x) << MMU_PAGESHIFT)
 423 #define mmu_btop(x)     (((x)) >> MMU_PAGESHIFT)
 424 #define mmu_btopr(x)    ((((x) + MMU_PAGEOFFSET) >> MMU_PAGESHIFT))
 425
 426 /*
 427  * 2 versions of pages to disk blocks
 428  */
 429 #define mmu_ptod(x)     ((x) << (MMU_PAGESHIFT - DEV_BSHIFT))
 430 #define ptod(x)         ((x) << (PAGESHIFT - DEV_BSHIFT))
 431
 432 /*
 433  * pages to bytes, and back (with and without rounding)
 434  * Large Files: The explicit cast of x to unsigned int is deliberately
 435  * removed as part of large files work. We pass longlong values to
 436  * theses macros.
 437  *
 438  * Cast the input to ptob() to be a page count. This enforces 64-bit
 439  * math on 64-bit kernels. For 32-bit kernels, callers must explicitly
 440  * cast the input to be a 64-bit type if values greater than 4GB/PAGESIZE
 441  * are possible.
 442  */
 443
 444 #ifdef _LP64
 445 #define ptob(x)         (((pgcnt_t)(x)) << PAGESHIFT)
 446 #else
 447 #define ptob(x)         ((x) << PAGESHIFT)
 448 #endif /* _LP64 */
 449 #define btop(x)         (((x) >> PAGESHIFT))
 450 #define btopr(x)        ((((x) + PAGEOFFSET) >> PAGESHIFT))
 451
 452 /*
 453  * disk blocks to pages, rounded and truncated
 454  */
 455 #define NDPP            (PAGESIZE/DEV_BSIZE)    /* # of disk blocks per page */
 456 #define dtop(DD)        (((DD) + NDPP - 1) >> (PAGESHIFT - DEV_BSHIFT))
 457 #define dtopt(DD)       ((DD) >> (PAGESHIFT - DEV_BSHIFT))
 458
 459 /*
 460  * kB to pages and back
 461  */
 462 #define kbtop(x)        ((x) >> (PAGESHIFT - 10))
 463 #define ptokb(x)        ((x) << (PAGESHIFT - 10))
 464
 465 /*
 466  * POSIX.4 related configuration parameters
 467  */
 468 #define _AIO_LISTIO_MAX         (4096)
 469 #define _AIO_MAX                (-1)
 470 #define _MQ_OPEN_MAX            (-1)
 471 #define _MQ_PRIO_MAX            (32)
 472 #define _SEM_NSEMS_MAX          INT_MAX
 473 #define _SEM_VALUE_MAX          INT_MAX
 474
 475 #ifdef  __cplusplus
 476 }
 477 #endif
 478
 479 #else   /* (defined(_KERNEL) || defined(_KMEMUSER)) */
 480
 481 /*
 482  * The following are assorted machine dependent values which can be
 483  * obtained in a machine independent manner through sysconf(2) or
 484  * sysinfo(2). In order to guarantee that these provide the expected
 485  * value at all times, the System Private interface (leading underscore)
 486  * is used.
 487  */
 488
 489 #include <sys/unistd.h>
 490
 491 #ifdef  __cplusplus
 492 extern "C" {
 493 #endif
 494
 495 #if !defined(_ASM)
 496 extern long _sysconf(int);      /* System Private interface to sysconf() */
 497 #endif  /* !defined(_ASM) */
 498
 499 #define HZ              ((clock_t)_sysconf(_SC_CLK_TCK))
 500 #define TICK            (1000000000/((clock_t)_sysconf(_SC_CLK_TCK)))
 501 #define PAGESIZE        (_sysconf(_SC_PAGESIZE))
 502 #define PAGEOFFSET      (PAGESIZE - 1)
 503 #define PAGEMASK        (~PAGEOFFSET)
 504 #define MAXPID          ((pid_t)_sysconf(_SC_MAXPID))
 505 #define MAXEPHUID       ((uid_t)_sysconf(_SC_EPHID_MAX))
 506
 507 #ifdef  __cplusplus
 508 }
 509 #endif
 510
 511 #endif  /* (defined(_KERNEL) || defined(_KMEMUSER)) &&  defined(_MACHDEP) */
 512
 513 #endif  /* _SYS_PARAM_H */