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+/*-
+ * 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. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. 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.
+ *
+ * @(#)param.h 8.3 (Berkeley) 4/4/95
+ * $Id$
+ */
+
+#ifndef _SYS_PARAM_H_
+#define _SYS_PARAM_H_
+
+#define BSD 199506 /* System version (year & month). */
+#define BSD4_3 1
+#define BSD4_4 1
+
+#ifndef NULL
+#define NULL 0
+#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 32 /* max interpreter file name length */
+#define MAXLOGNAME 12 /* max login name length */
+#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 */
+#define NOGROUP 65535 /* marker for empty group set member */
+#define MAXHOSTNAMELEN 256 /* max hostname size */
+
+/* More types and definitions used throughout the kernel. */
+#ifdef KERNEL
+#include <sys/cdefs.h>
+#include <sys/errno.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/ucred.h>
+#include <sys/uio.h>
+#include <sys/rtprio.h>
+
+#ifndef FALSE
+#define FALSE 0
+#endif
+#ifndef TRUE
+#define TRUE 1
+#endif
+#endif
+
+/* Signals. */
+#include <sys/signal.h>
+
+/* Machine type dependent parameters. */
+#include <machine/param.h>
+#include <machine/limits.h>
+
+/*
+ * 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
+#define PZERO 22 /* No longer magic, shouldn't be here. XXX */
+#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 NZERO 0 /* default "nice" */
+
+#define NBPW sizeof(int) /* number of bytes per word (integer) */
+
+#define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */
+#define NODEV (dev_t)(-1) /* non-existent device */
+
+/*
+ * Clustering of hardware pages on machines with ridiculously small
+ * page sizes is done here. The paging subsystem deals with units of
+ * CLSIZE pte's describing PAGE_SIZE (from machine/machparam.h) pages each.
+ */
+#if 0
+#define CLBYTES (CLSIZE*PAGE_SIZE)
+#endif
+
+#define CBLOCK 128 /* Clist block size, must be a power of 2. */
+#define CBQSIZE (CBLOCK/NBBY) /* Quote bytes/cblock - can do better. */
+ /* Data chars/clist. */
+#define CBSIZE (CBLOCK - sizeof(struct cblock *) - CBQSIZE)
+#define CROUND (CBLOCK - 1) /* Clist rounding. */
+
+/*
+ * 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 make make some file systems unmountable. Also, MAXBSIZE
+ * must be less than MAXPHYS!!! DFLTBSIZE is the average amount of
+ * memory allocated by vfs_bio per nbuf. BKVASIZE is the average amount
+ * of kernel virtual space allocated per nbuf. BKVASIZE should be >=
+ * DFLTBSIZE. If it is significantly bigger than DFLTBSIZE, then
+ * kva fragmentation causes fewer performance problems.
+ */
+#define MAXBSIZE 65536
+#define BKVASIZE 8192
+#define DFLTBSIZE 4096
+#define MAXFRAG 8
+
+/*
+ * 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 32
+
+/* Bit map related macros. */
+#define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
+#define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
+#define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
+#define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
+
+/* Macros for counting and rounding. */
+#ifndef howmany
+#define howmany(x, y) (((x)+((y)-1))/(y))
+#endif
+#define rounddown(x, y) (((x)/(y))*(y))
+#define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */
+#define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */
+#define powerof2(x) ((((x)-1)&(x))==0)
+
+/* Macros for min/max. */
+#ifndef KERNEL
+#define MIN(a,b) (((a)<(b))?(a):(b))
+#define MAX(a,b) (((a)>(b))?(a):(b))
+#endif
+
+/*
+ * Constants for setting the parameters of the kernel memory allocator.
+ *
+ * 2 ** MINBUCKET is the smallest unit of memory that will be
+ * allocated. It must be at least large enough to hold a pointer.
+ *
+ * Units of memory less or equal to MAXALLOCSAVE will permanently
+ * allocate physical memory; requests for these size pieces of
+ * memory are quite fast. Allocations greater than MAXALLOCSAVE must
+ * always allocate and free physical memory; requests for these
+ * size allocations should be done infrequently as they will be slow.
+ *
+ * Constraints: PAGE_SIZE <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
+ * MAXALLOCSIZE must be a power of two.
+ */
+#define MINBUCKET 4 /* 4 => min allocation of 16 bytes */
+#define MAXALLOCSAVE (2 * PAGE_SIZE)
+
+/*
+ * 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 */
+#define FSCALE (1<<FSHIFT)
+
+#endif /* _SYS_PARAM_H_ */