URL
https://opencores.org/ocsvn/openrisc/openrisc/trunk
Subversion Repositories openrisc
[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [rtems/] [sys/] [param.h] - Rev 859
Go to most recent revision | Compare with Previous | Blame | View Log
/*- * 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. * 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: param.h 207 2010-07-19 17:43:24Z jeremybennett $ */ #ifndef _SYS_PARAM_H_ #define _SYS_PARAM_H_ /* from newlib's <sys/param.h> */ #include <sys/config.h> #include <machine/endian.h> # define PATHSIZE (1024) /* end of from newlib's <sys/param.h> */ #include <unistd.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. */ #if defined(KERNEL) || defined(_KERNEL) #include <sys/cdefs.h> #include <sys/errno.h> #include <sys/time.h> #include <sys/resource.h> #include <sys/uio.h> #include <sys/priority.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> #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 */ #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. */ #if !defined(__rtems__) #define MAXPATHLEN PATH_MAX #endif #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. */ #if !(defined(KERNEL) || defined(_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_ */
Go to most recent revision | Compare with Previous | Blame | View Log