 @@ -1,498 +1,498 @@
-/*	$NetBSD: param.h,v 1.552 2017/11/16 10:40:29 ozaki-r Exp $	*/
+/*	$NetBSD: param.h,v 1.553 2017/12/01 19:04:19 christos 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.
+ *
  *	@(#)param.h	8.3 (Berkeley) 4/4/95
  */
 #ifndef _SYS_PARAM_H_
 #define	_SYS_PARAM_H_
 #ifdef _KERNEL_OPT
 #include "opt_param.h"
 #endif
 /*
  * Historic BSD #defines -- probably will remain untouched for all time.
  */
 #define	BSD	199506		/* System version (year & month). */
 #define	BSD4_3	1
 #define	BSD4_4	1
 /*
  *	#define __NetBSD_Version__ MMmmrrpp00
+ *
  *	M = major version
  *	m = minor version; a minor number of 99 indicates current.
  *	r = 0 (*)
  *	p = patchlevel
+ *
  * When new releases are made, src/gnu/usr.bin/groff/tmac/mdoc.local
  * needs to be updated and the changes sent back to the groff maintainers.
+ *
  * (*)	Up to 2.0I "release" used to be "",A-Z,Z[A-Z] but numeric
  *	    	e.g. NetBSD-1.2D  = 102040000 ('D' == 4)
  *	NetBSD-2.0H 	(200080000) was changed on 20041001 to:
  *	2.99.9		(299000900)
  */
-#define	__NetBSD_Version__	899000700	/* NetBSD 8.99.7 */
+#define	__NetBSD_Version__	899000800	/* NetBSD 8.99.8 */
 #define __NetBSD_Prereq__(M,m,p) (((((M) * 100000000) + \
     (m) * 1000000) + (p) * 100) <= __NetBSD_Version__)
 /*
  * Historical NetBSD #define
+ *
  * NetBSD 1.4 was the last release for which this value was incremented.
  * The value is now permanently fixed at 199905. It will never be
  * changed again.
+ *
  * New code must use __NetBSD_Version__ instead, and should not even
  * count on NetBSD being defined.
+ *
  */
 #define	NetBSD	199905		/* NetBSD version (year & month). */
 /*
  * There macros determine if we are running in protected mode or not.
  *   _HARDKERNEL: code uses kernel namespace and runs in hw priviledged mode
  *   _SOFTKERNEL: code uses kernel namespace but runs without hw priviledges
  */
 #if defined(_KERNEL) && !defined(_RUMPKERNEL)
 #define _HARDKERNEL
 #endif
 #if defined(_KERNEL) && defined(_RUMPKERNEL)
 #define _SOFTKERNEL
 #endif
 #include <sys/null.h>
 #ifndef __ASSEMBLER__
 #include <sys/inttypes.h>
 #include <sys/types.h>
 /*
  * 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>)
  * MAXHOSTNAMELEN should be >= (_POSIX_HOST_NAME_MAX + 1) (see <limits.h>)
  * MAXLOGNAME should be >= UT_NAMESIZE (see <utmp.h>)
  */
 #include <sys/syslimits.h>
 #define	MAXCOMLEN	16		/* max command name remembered */
 #define	MAXINTERP	PATH_MAX	/* max interpreter file name length */
 /* DEPRECATED: use LOGIN_NAME_MAX instead. */
 #define	MAXLOGNAME	(LOGIN_NAME_MAX - 1) /* max login name length */
 #define	NCARGS		ARG_MAX		/* max bytes for an exec function */
 #define	NGROUPS		NGROUPS_MAX	/* max number groups */
 #define	NOGROUP		65535		/* marker for empty group set member */
 #define	MAXHOSTNAMELEN	256		/* max hostname size */
 #ifndef NOFILE
 #define	NOFILE		OPEN_MAX	/* max open files per process */
 #endif
 #ifndef MAXUPRC				/* max simultaneous processes */
 #define	MAXUPRC		CHILD_MAX	/* POSIX 1003.1-compliant default */
 #else
 #if (MAXUPRC - 0) < CHILD_MAX
 #error MAXUPRC less than CHILD_MAX.  See options(4) for details.
 #endif /* (MAXUPRC - 0) < CHILD_MAX */
 #endif /* !defined(MAXUPRC) */
 /* Macros for min/max. */
 #define	MIN(a,b)	((/*CONSTCOND*/(a)<(b))?(a):(b))
 #define	MAX(a,b)	((/*CONSTCOND*/(a)>(b))?(a):(b))
 /* 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 <uvm/uvm_param.h>
 #ifndef NPROC
 #define	NPROC	(20 + 16 * MAXUSERS)
 #endif
 #ifndef NTEXT
 #define	NTEXT	(80 + NPROC / 8)		/* actually the object cache */
 #endif
 #ifndef NVNODE
 #define	NVNODE	(NPROC + NTEXT + 100)
 #define	NVNODE_IMPLICIT
 #endif
 #ifndef VNODE_KMEM_MAXPCT
 #define	VNODE_KMEM_MAXPCT	60
 #endif
 #ifndef BUFCACHE_VA_MAXPCT
 #define	BUFCACHE_VA_MAXPCT	20
 #endif
 #define	VNODE_COST	2048			/* assumed space in bytes */
 #endif /* _KERNEL */
 /* Signals. */
 #include <sys/signal.h>
 /* Machine type dependent parameters. */
 #include <machine/param.h>
 #include <machine/limits.h>
 /* pages ("clicks") to disk blocks */
 #define	ctod(x)		((x) << (PGSHIFT - DEV_BSHIFT))
 #define	dtoc(x)		((x) >> (PGSHIFT - DEV_BSHIFT))
 /* bytes to pages */
 #define	ctob(x)		((x) << PGSHIFT)
 #define	btoc(x)		(((x) + PGOFSET) >> PGSHIFT)
 /* bytes to disk blocks */
 #define	dbtob(x)	((x) << DEV_BSHIFT)
 #define	btodb(x)	((x) >> DEV_BSHIFT)
 #ifndef COHERENCY_UNIT
 #define	COHERENCY_UNIT		64
 #endif
 #ifndef CACHE_LINE_SIZE
 #define	CACHE_LINE_SIZE		64
 #endif
 #ifndef MAXCPUS
 #define	MAXCPUS			32
 #endif
 #ifndef MAX_LWP_PER_PROC
 #define	MAX_LWP_PER_PROC	8000
 #endif
 /*
  * Stack macros.  On most architectures, the stack grows down,
  * towards lower addresses; it is the rare architecture where
  * it grows up, towards higher addresses.
+ *
  * STACK_GROW and STACK_SHRINK adjust a stack pointer by some
  * size, no questions asked.  STACK_ALIGN aligns a stack pointer.
+ *
  * STACK_ALLOC returns a pointer to allocated stack space of
  * some size; given such a pointer and a size, STACK_MAX gives
  * the maximum (in the "maxsaddr" sense) stack address of the
  * allocated memory.
  */
 #if defined(_KERNEL) || defined(__EXPOSE_STACK)
 #ifndef STACK_ALIGNBYTES
 #define STACK_ALIGNBYTES	__ALIGNBYTES
 #endif
 #ifdef __MACHINE_STACK_GROWS_UP
 #define	STACK_GROW(sp, _size)		(((char *)(void *)(sp)) + (_size))
 #define	STACK_SHRINK(sp, _size)		(((char *)(void *)(sp)) - (_size))
 #define	STACK_ALIGN(sp, bytes)	\
 	((char *)((((unsigned long)(sp)) + (bytes)) & ~(bytes)))
 #define	STACK_ALLOC(sp, _size)		((char *)(void *)(sp))
 #define	STACK_MAX(p, _size)		(((char *)(void *)(p)) + (_size))
 #else
 #define	STACK_GROW(sp, _size)		(((char *)(void *)(sp)) - (_size))
 #define	STACK_SHRINK(sp, _size)		(((char *)(void *)(sp)) + (_size))
 #define	STACK_ALIGN(sp, bytes)	\
 	((char *)(((unsigned long)(sp)) & ~(bytes)))
 #define	STACK_ALLOC(sp, _size)		(((char *)(void *)(sp)) - (_size))
 #define	STACK_MAX(p, _size)		((char *)(void *)(p))
 #endif
 #define	STACK_LEN_ALIGN(len, bytes)	(((len) + (bytes)) & ~(bytes))
 #endif /* defined(_KERNEL) || defined(__EXPOSE_STACK) */
 /*
  * Round p (pointer or byte index) up to a correctly-aligned value for all
  * data types (int, long, ...).   The result is u_int and must be cast to
  * any desired pointer type.
+ *
  * ALIGNED_POINTER is a boolean macro that checks whether an address
  * is valid to fetch data elements of type t from on this architecture.
  * This does not reflect the optimal alignment, just the possibility
  * (within reasonable limits).
+ *
  */
 #define ALIGNBYTES	__ALIGNBYTES
 #ifndef ALIGN
 #define	ALIGN(p)		(((uintptr_t)(p) + ALIGNBYTES) & ~ALIGNBYTES)
 #endif
 #ifndef ALIGNED_POINTER
 #define	ALIGNED_POINTER(p,t)	((((uintptr_t)(p)) & (sizeof(t) - 1)) == 0)
 #endif
 /*
  * Historic priority levels.  These are meaningless and remain only
  * for source compatibility.  Do not use in new code.
  */
 #define	PSWP	0
 #define	PVM	4
 #define	PINOD	8
 #define	PRIBIO	16
 #define	PVFS	20
 #define	PZERO	22
 #define	PSOCK	24
 #define	PWAIT	32
 #define	PLOCK	36
 #define	PPAUSE	40
 #define	PUSER	50
 #define	MAXPRI	127
 #define	PCATCH		0x100	/* OR'd with pri for tsleep to check signals */
 #define	PNORELOCK	0x200	/* OR'd with pri for tsleep to not relock */
 /*
  * New priority levels.
  */
 #define	PRI_COUNT		224
 #define	PRI_NONE		(-1)
 #define	PRI_KERNEL_RT		192
 #define	NPRI_KERNEL_RT		32
 #define	MAXPRI_KERNEL_RT	(PRI_KERNEL_RT + NPRI_KERNEL_RT - 1)
 #define	PRI_USER_RT		128
 #define	NPRI_USER_RT		64
 #define	MAXPRI_USER_RT		(PRI_USER_RT + NPRI_USER_RT - 1)
 #define	PRI_KTHREAD		96
 #define	NPRI_KTHREAD		32
 #define	MAXPRI_KTHREAD		(PRI_KTHREAD + NPRI_KTHREAD - 1)
 #define	PRI_KERNEL		64
 #define	NPRI_KERNEL		32
 #define	MAXPRI_KERNEL		(PRI_KERNEL + NPRI_KERNEL - 1)
 #define	PRI_USER		0
 #define	NPRI_USER		64
 #define	MAXPRI_USER		(PRI_USER + NPRI_USER - 1)
 /* Priority range used by POSIX real-time features */
 #define	SCHED_PRI_MIN		0
 #define	SCHED_PRI_MAX		63
 /*
  * Kernel thread priorities.
  */
 #define	PRI_SOFTSERIAL	MAXPRI_KERNEL_RT
 #define	PRI_SOFTNET	(MAXPRI_KERNEL_RT - schedppq * 1)
 #define	PRI_SOFTBIO	(MAXPRI_KERNEL_RT - schedppq * 2)
 #define	PRI_SOFTCLOCK	(MAXPRI_KERNEL_RT - schedppq * 3)
 #define	PRI_XCALL	MAXPRI_KTHREAD
 #define	PRI_PGDAEMON	(MAXPRI_KTHREAD - schedppq * 1)
 #define	PRI_VM		(MAXPRI_KTHREAD - schedppq * 2)
 #define	PRI_IOFLUSH	(MAXPRI_KTHREAD - schedppq * 3)
 #define	PRI_BIO		(MAXPRI_KTHREAD - schedppq * 4)
 #define	PRI_IDLE	PRI_USER
 /*
  * Miscellaneous.
  */
 #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 */
 /*
  * 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 may make some file systems unmountable.
  */
 #ifndef MAXBSIZE				/* XXX */
 #define	MAXBSIZE	MAXPHYS
 #endif
 #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.
+ *
  * MAXSYMLINKS should be >= _POSIX_SYMLOOP_MAX (see <limits.h>)
  */
 #define	MAXPATHLEN	PATH_MAX
 #define	MAXSYMLINKS	32
 /*
  * This is the maximum individual filename component length enforced by
  * namei. Filesystems cannot exceed this limit. The upper bound for that
  * limit is NAME_MAX. We don't bump it for now, for compatibility with
  * old binaries during the time where MAXNAMLEN was 511 and NAME_MAX was
  * 255
  */
 #define	KERNEL_NAME_MAX	255
 /* 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	roundup(x, y)	((((x)+((y)-1))/(y))*(y))
 #define	rounddown(x,y)	(((x)/(y))*(y))
 /*
  * Rounding to powers of two.  The naive definitions of roundup2 and
  * rounddown2,
+ *
  *	#define	roundup2(x,m)	(((x) + ((m) - 1)) & ~((m) - 1))
  *	#define	rounddown2(x,m)	((x) & ~((m) - 1)),
+ *
  * exhibit a quirk of integer arithmetic in C because the complement
  * happens in the type of m, not in the type of x.  So if unsigned int
  * is 32-bit, and m is an unsigned int while x is a uint64_t, then
  * roundup2 and rounddown2 would have the unintended effect of clearing
  * the upper 32 bits of the result(!).  These definitions avoid the
  * pitfalls of C arithmetic depending on the types of x and m, and
  * additionally avoid multiply evaluating their arguments.
  */
 #define	roundup2(x,m)	((((x) - 1) | ((m) - 1)) + 1)
 #define	rounddown2(x,m)	((x) & ~((__typeof__(x))((m) - 1)))
 #define	powerof2(x)	((((x)-1)&(x))==0)
 /*
  * 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: NBPG <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and
  * MAXALLOCSAVE must be a power of two.
  */
 #ifdef _LP64
 #define	MINBUCKET	5		/* 5 => min allocation of 32 bytes */
 #else
 #define	MINBUCKET	4		/* 4 => min allocation of 16 bytes */
 #endif
 #define	MAXALLOCSAVE	(2 * NBPG)
 /*
  * 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)
 /*
  * The time for a process to be blocked before being very swappable.
  * This is a number of seconds which the system takes as being a non-trivial
  * amount of real time.  You probably shouldn't change this;
  * it is used in subtle ways (fractions and multiples of it are, that is, like
  * half of a ``long time'', almost a long time, etc.)
  * It is related to human patience and other factors which don't really
  * change over time.
  */
 #define        MAXSLP          20
 /*
  * Defaults for Unified Buffer Cache parameters.
  * These may be overridden in <machine/param.h>.
  */
 #ifndef UBC_WINSHIFT
 #define	UBC_WINSHIFT	13
 #endif
 #ifndef UBC_NWINS
 #define	UBC_NWINS	1024
 #endif
 #ifdef _KERNEL
 /*
  * macro to convert from milliseconds to hz without integer overflow
  * Default version using only 32bits arithmetics.
  * 64bit port can define 64bit version in their <machine/param.h>
  * 0x20000 is safe for hz < 20000
  */
 #ifndef mstohz
 #define mstohz(ms) \
 	(__predict_false((ms) >= 0x20000) ? \
 	    ((ms +0u) / 1000u) * hz : \
 	    ((ms +0u) * hz) / 1000u)
 #endif
 #ifndef hztoms
 #define hztoms(t) \
 	(__predict_false((t) >= 0x20000) ? \
 	    ((t +0u) / hz) * 1000u : \
 	    ((t +0u) * 1000u) / hz)
 #endif
 #define	hz2bintime(t)	(ms2bintime(hztoms(t)))
 extern const int schedppq;
 extern size_t coherency_unit;
 #endif /* _KERNEL */
 /*
  * Minimum alignment of "struct lwp" needed by the architecture.
  * This counts when packing a lock byte into a word alongside a
  * pointer to an LWP.
  */
 #ifndef MIN_LWP_ALIGNMENT
 #define	MIN_LWP_ALIGNMENT	32
 #endif
 #endif /* !__ASSEMBLER__ */
 #endif /* !_SYS_PARAM_H_ */