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param.h revision 1.11 
      1 /*	$NetBSD: param.h,v 1.11 2002/05/09 12:28:08 uch 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. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the University of
     22  *	California, Berkeley and its contributors.
     23  * 4. Neither the name of the University nor the names of its contributors
     24  *    may be used to endorse or promote products derived from this software
     25  *    without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     37  * SUCH DAMAGE.
     38  *
     39  *	@(#)param.h	5.8 (Berkeley) 6/28/91
     40  */
     41 
     42 /*
     43  * SuperH dependent constants.
     44  */
     45 
     46 #ifndef _SH3_PARAM_H_
     47 #define	_SH3_PARAM_H_
     48 
     49 #if defined(_KERNEL) && !defined(_LOCORE)
     50 #include <sh3/cpu.h>
     51 #endif
     52 
     53 /* NetBSD/sh3 is 4KB page */
     54 #define	PGSHIFT			12
     55 #define	NBPG			(1 << PGSHIFT)
     56 #define	PGOFSET			(NBPG - 1)
     57 
     58 /*
     59  * Round p (pointer or byte index) up to a correctly-aligned value
     60  * for all data types (int, long, ...).   The result is u_int and
     61  * must be cast to any desired pointer type.
     62  *
     63  * ALIGNED_POINTER is a boolean macro that checks whether an address
     64  * is valid to fetch data elements of type t from on this architecture.
     65  * This does not reflect the optimal alignment, just the possibility
     66  * (within reasonable limits).
     67  *
     68  */
     69 #define	ALIGNBYTES		(sizeof(int) - 1)
     70 #define	ALIGN(p)		(((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES)
     71 #define	ALIGNED_POINTER(p, t)	((((u_long)(p)) & (sizeof(t) - 1)) == 0)
     72 
     73 #define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
     74 #define	DEV_BSIZE	(1 << DEV_BSHIFT)
     75 #define	BLKDEV_IOSIZE	2048
     76 #define	MAXPHYS		(64 * 1024)	/* max raw I/O transfer size */
     77 
     78 /*
     79  * u-space.
     80  */
     81 #define	UPAGES		3		/* pages of u-area */
     82 #define	USPACE		(UPAGES * NBPG)	/* total size of u-area */
     83 #if UPAGES == 1
     84 #error "too small u-area"
     85 #elif UPAGES == 2
     86 #define	P1_STACK	/* kernel stack is P1-area */
     87 #else
     88 #undef	P1_STACK	/* kernel stack is P3-area */
     89 #endif
     90 
     91 #ifndef MSGBUFSIZE
     92 #define	MSGBUFSIZE	NBPG		/* default message buffer size */
     93 #endif
     94 
     95 /*
     96  * Constants related to network buffer management.
     97  * MCLBYTES must be no larger than NBPG (the software page size), and,
     98  * on machines that exchange pages of input or output buffers with mbuf
     99  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
    100  * of the hardware page size.
    101  */
    102 #define	MSIZE		256		/* size of an mbuf */
    103 
    104 #ifndef MCLSHIFT
    105 #define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
    106 					/* 2K cluster can hold Ether frame */
    107 #endif	/* MCLSHIFT */
    108 
    109 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
    110 
    111 #ifndef NMBCLUSTERS
    112 #if defined(_KERNEL_OPT)
    113 #include "opt_gateway.h"
    114 #endif
    115 
    116 #ifdef GATEWAY
    117 #define	NMBCLUSTERS	512		/* map size, max cluster allocation */
    118 #else
    119 #define	NMBCLUSTERS	256		/* map size, max cluster allocation */
    120 #endif
    121 #endif
    122 
    123 /*
    124  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
    125  * logical pages.
    126  */
    127 #define	NKMEMPAGES_MIN_DEFAULT	((6 * 1024 * 1024) >> PAGE_SHIFT)
    128 #define	NKMEMPAGES_MAX_DEFAULT	((6 * 1024 * 1024) >> PAGE_SHIFT)
    129 
    130 /* pages ("clicks") to disk blocks */
    131 #define	ctod(x)		((x) << (PGSHIFT - DEV_BSHIFT))
    132 #define	dtoc(x)		((x) >> (PGSHIFT - DEV_BSHIFT))
    133 
    134 /* bytes to pages */
    135 #define	ctob(x)		((x) << PGSHIFT)
    136 #define	btoc(x)		(((x) + PGOFSET) >> PGSHIFT)
    137 
    138 /* bytes to disk blocks */
    139 #define	dbtob(x)	((x) << DEV_BSHIFT)
    140 #define	btodb(x)	((x) >> DEV_BSHIFT)
    141 #endif /* !_SH3_PARAM_H_ */
    142