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Diffstat (limited to 'sys/sys/param.h')
| -rw-r--r-- | sys/sys/param.h | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/sys/sys/param.h b/sys/sys/param.h new file mode 100644 index 0000000..76c5e2f --- /dev/null +++ b/sys/sys/param.h @@ -0,0 +1,223 @@ +/* $OpenBSD: param.h,v 1.130 2020/04/05 06:34:20 deraadt 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 202005 /* OpenBSD version (year & month). */ +#define OpenBSD6_7 1 /* OpenBSD 6.7 */ + +#include <sys/_null.h> + +#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_ */ |