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param.h revision 1.17 
      1 /*	$NetBSD: param.h,v 1.17 2007/09/23 23:07:27 pooka Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2002 The NetBSD Foundation, Inc. All rights reserved.
      5  * Copyright (c) 1990 The Regents of the University of California.
      6  * All rights reserved.
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * William Jolitz.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  *
     35  *	@(#)param.h	5.8 (Berkeley) 6/28/91
     36  */
     37 
     38 /*
     39  * SuperH dependent constants.
     40  */
     41 
     42 #ifndef _SH3_PARAM_H_
     43 #define	_SH3_PARAM_H_
     44 
     45 #if defined(_KERNEL) && !defined(_LOCORE)
     46 #include <machine/cpu.h>
     47 #endif
     48 
     49 /* NetBSD/sh3 is 4KB page */
     50 #define	PGSHIFT			12
     51 #define	NBPG			(1 << PGSHIFT)
     52 #define	PGOFSET			(NBPG - 1)
     53 
     54 /*
     55  * Round p (pointer or byte index) up to a correctly-aligned value
     56  * for all data types (int, long, ...).   The result is u_int and
     57  * must be cast to any desired pointer type.
     58  *
     59  * ALIGNED_POINTER is a boolean macro that checks whether an address
     60  * is valid to fetch data elements of type t from on this architecture.
     61  * This does not reflect the optimal alignment, just the possibility
     62  * (within reasonable limits).
     63  *
     64  */
     65 #define	ALIGNBYTES		(sizeof(int) - 1)
     66 #define	ALIGN(p)		(((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES)
     67 #define	ALIGNED_POINTER(p, t)	((((u_long)(p)) & (sizeof(t) - 1)) == 0)
     68 
     69 #define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
     70 #define	DEV_BSIZE	(1 << DEV_BSHIFT)
     71 #define	BLKDEV_IOSIZE	2048
     72 #define	MAXPHYS		(64 * 1024)	/* max raw I/O transfer size */
     73 
     74 /*
     75  * u-space.
     76  */
     77 #define	UPAGES		3		/* pages of u-area */
     78 #define	USPACE		(UPAGES * NBPG)	/* total size of u-area */
     79 #if UPAGES == 1
     80 #error "too small u-area"
     81 #elif UPAGES == 2
     82 #define	P1_STACK	/* kernel stack is P1-area */
     83 #else
     84 #undef	P1_STACK	/* kernel stack is P3-area */
     85 #endif
     86 
     87 #ifndef MSGBUFSIZE
     88 #define	MSGBUFSIZE	NBPG		/* default message buffer size */
     89 #endif
     90 
     91 /*
     92  * Constants related to network buffer management.
     93  * MCLBYTES must be no larger than NBPG (the software page size), and,
     94  * on machines that exchange pages of input or output buffers with mbuf
     95  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
     96  * of the hardware page size.
     97  */
     98 #define	MSIZE		256		/* size of an mbuf */
     99 
    100 #ifndef MCLSHIFT
    101 #define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
    102 					/* 2K cluster can hold Ether frame */
    103 #endif	/* MCLSHIFT */
    104 
    105 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
    106 
    107 #ifndef NMBCLUSTERS
    108 #if defined(_KERNEL_OPT)
    109 #include "opt_gateway.h"
    110 #endif
    111 
    112 #ifdef GATEWAY
    113 #define	NMBCLUSTERS	512		/* map size, max cluster allocation */
    114 #else
    115 #define	NMBCLUSTERS	256		/* map size, max cluster allocation */
    116 #endif
    117 #endif
    118 
    119 /*
    120  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
    121  * logical pages.
    122  */
    123 #define	NKMEMPAGES_MIN_DEFAULT	((6 * 1024 * 1024) >> PAGE_SHIFT)
    124 #define	NKMEMPAGES_MAX_DEFAULT	((6 * 1024 * 1024) >> PAGE_SHIFT)
    125 
    126 /*
    127  * Needed to support adaptive mutexes.  See sh3/include/mutex.h.
    128  */
    129 #define	MIN_LWP_ALIGNMENT	64
    130 
    131 #endif /* !_SH3_PARAM_H_ */
    132