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- /* $OpenBSD: param.h,v 1.118 2015/07/02 01:34:00 dlg Exp $ */
- /*-
- * Copyright (c) 1982, 1986, 1989, 1993
- * The Regents of the University of California. All rights reserved.
- * (c) UNIX System Laboratories, Inc.
- * All or some portions of this file are derived from material licensed
- * to the University of California by American Telephone and Telegraph
- * Co. or Unix System Laboratories, Inc. and are reproduced herein with
- * the permission of UNIX System Laboratories, Inc.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #ifndef _SYS_PARAM_H_
- #define _SYS_PARAM_H_
- #define BSD 199306 /* System version (year & month). */
- #define BSD4_3 1
- #define BSD4_4 1
- #define OpenBSD 201510 /* OpenBSD version (year & month). */
- #define OpenBSD5_8 1 /* OpenBSD 5.8 */
- #ifndef NULL
- #ifdef __GNUG__
- #define NULL __null
- #else
- #define NULL ((void *)0)
- #endif
- #endif
- #ifndef _LOCORE
- #include <sys/types.h>
- #endif
- /*
- * Machine-independent constants (some used in following include files).
- * Redefined constants are from POSIX 1003.1 limits file.
- *
- * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>)
- * MAXLOGNAME should be >= UT_NAMESIZE (see <utmp.h>)
- */
- #include <sys/syslimits.h>
- #define MAXCOMLEN 16 /* max command name remembered */
- #define MAXINTERP 128 /* max interpreter file name length */
- #define MAXLOGNAME LOGIN_NAME_MAX /* max login name length w/ NUL */
- #define MAXUPRC CHILD_MAX /* max simultaneous processes */
- #define NCARGS ARG_MAX /* max bytes for an exec function */
- #define NGROUPS NGROUPS_MAX /* max number groups */
- #define NOFILE OPEN_MAX /* max open files per process (soft) */
- #define NOFILE_MAX 1024 /* max open files per process (hard) */
- #define NOGROUP 65535 /* marker for empty group set member */
- #define MAXHOSTNAMELEN 256 /* max hostname length w/ NUL */
- /* More types and definitions used throughout the kernel. */
- #ifdef _KERNEL
- #include <sys/errno.h>
- #include <sys/time.h>
- #include <sys/resource.h>
- #include <sys/ucred.h>
- #include <sys/uio.h>
- #include <sys/srp.h>
- #endif
- /* Signals. */
- #include <sys/signal.h>
- /* Machine type dependent parameters. */
- #include <sys/limits.h>
- #include <machine/param.h>
- #ifdef _KERNEL
- /*
- * Priorities. Note that with 32 run queues, differences less than 4 are
- * insignificant.
- */
- #define PSWP 0
- #define PVM 4
- #define PINOD 8
- #define PRIBIO 16
- #define PVFS 20
- #endif /* _KERNEL */
- #define PZERO 22 /* No longer magic, shouldn't be here. XXX */
- #ifdef _KERNEL
- #define PSOCK 24
- #define PWAIT 32
- #define PLOCK 36
- #define PPAUSE 40
- #define PUSER 50
- #define MAXPRI 127 /* Priorities range from 0 through MAXPRI. */
- #define PRIMASK 0x0ff
- #define PCATCH 0x100 /* OR'd with pri for tsleep to check signals */
- #define PNORELOCK 0x200 /* OR'd with pri for msleep to not reaquire
- the mutex */
- #endif /* _KERNEL */
- #define NODEV (dev_t)(-1) /* non-existent device */
- #define ALIGNBYTES _ALIGNBYTES
- #define ALIGN(p) _ALIGN(p)
- #define ALIGNED_POINTER(p,t) _ALIGNED_POINTER(p,t)
- /*
- * File system parameters and macros.
- *
- * The file system is made out of blocks of at most MAXBSIZE units, with
- * smaller units (fragments) only in the last direct block. MAXBSIZE
- * primarily determines the size of buffers in the buffer pool. It may be
- * made larger without any effect on existing file systems; however making
- * it smaller makes some file systems unmountable.
- */
- #ifdef _KERNEL
- #define MAXPHYS (64 * 1024) /* max raw I/O transfer size */
- #endif /* _KERNEL */
- #define MAXBSIZE (64 * 1024)
- #define _DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
- #define DEV_BSIZE (1 << _DEV_BSHIFT)
- #ifdef _KERNEL
- #define DEV_BSHIFT _DEV_BSHIFT
- #define BLKDEV_IOSIZE PAGE_SIZE
- #endif /* _KERNEL */
- /* pages to disk blocks */
- #ifndef ctod
- #define ctod(x) ((x) << (PAGE_SHIFT - _DEV_BSHIFT))
- #endif
- #ifndef dtoc
- #define dtoc(x) ((x) >> (PAGE_SHIFT - _DEV_BSHIFT))
- #endif
- /* bytes to disk blocks */
- #ifndef btodb
- #define btodb(x) ((x) >> _DEV_BSHIFT)
- #endif
- #ifndef dbtob
- #define dbtob(x) ((x) << _DEV_BSHIFT)
- #endif
- /*
- * MAXPATHLEN defines the longest permissible path length after expanding
- * symbolic links. It is used to allocate a temporary buffer from the buffer
- * pool in which to do the name expansion, hence should be a power of two,
- * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the
- * maximum number of symbolic links that may be expanded in a path name.
- * It should be set high enough to allow all legitimate uses, but halt
- * infinite loops reasonably quickly.
- */
- #define MAXPATHLEN PATH_MAX
- #define MAXSYMLINKS SYMLOOP_MAX
- /* Macros to set/clear/test flags. */
- #ifdef _KERNEL
- #define SET(t, f) ((t) |= (f))
- #define CLR(t, f) ((t) &= ~(f))
- #define ISSET(t, f) ((t) & (f))
- #endif /* _KERNEL */
- /* Bit map related macros. */
- #define setbit(a,i) ((a)[(i)>>3] |= 1<<((i)&(NBBY-1)))
- #define clrbit(a,i) ((a)[(i)>>3] &= ~(1<<((i)&(NBBY-1))))
- #define isset(a,i) ((a)[(i)>>3] & (1<<((i)&(NBBY-1))))
- #define isclr(a,i) (((a)[(i)>>3] & (1<<((i)&(NBBY-1)))) == 0)
- /* Macros for counting and rounding. */
- #ifndef howmany
- #define howmany(x, y) (((x)+((y)-1))/(y))
- #endif
- #define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
- #define powerof2(x) ((((x)-1)&(x))==0)
- /* Macros for min/max. */
- #define MIN(a,b) (((a)<(b))?(a):(b))
- #define MAX(a,b) (((a)>(b))?(a):(b))
- /* Macros for calculating the offset of a field */
- #if !defined(offsetof) && defined(_KERNEL)
- #if __GNUC_PREREQ__(4, 0)
- #define offsetof(s, e) __builtin_offsetof(s, e)
- #else
- #define offsetof(s, e) ((size_t)&((s *)0)->e)
- #endif
- #endif /* !defined(offsetof) && defined(_KERNEL) */
- #define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
- /*
- * Scale factor for scaled integers used to count %cpu time and load avgs.
- *
- * The number of CPU `tick's that map to a unique `%age' can be expressed
- * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that
- * can be calculated (assuming 32 bits) can be closely approximated using
- * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15).
- *
- * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age',
- * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024.
- */
- #define _FSHIFT 11 /* bits to right of fixed binary point */
- #ifdef _KERNEL
- #define FSHIFT _FSHIFT
- #endif
- #define FSCALE (1<<_FSHIFT)
- #endif /* !_SYS_PARAM_H_ */
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