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param.h revision 1.17 
      1 /*	$NetBSD: param.h,v 1.17 2003/03/04 07:50:58 matt Exp $	*/
      2 
      3 /*-
      4  * Copyright (C) 1995, 1996 Wolfgang Solfrank.
      5  * Copyright (C) 1995, 1996 TooLs GmbH.
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by TooLs GmbH.
     19  * 4. The name of TooLs GmbH may not be used to endorse or promote products
     20  *    derived from this software without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
     23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     26  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     27  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     28  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     29  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     30  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     31  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32  */
     33 
     34 #ifndef _POWERPC_PARAM_H
     35 #define	_POWERPC_PARAM_H
     36 
     37 #ifdef	_KERNEL
     38 #if defined(_KERNEL_OPT)
     39 #include "opt_ppcarch.h"
     40 #endif
     41 #ifndef	_LOCORE
     42 #include <machine/cpu.h>
     43 #endif	/* _LOCORE */
     44 #endif
     45 
     46 /*
     47  * Machine dependent constants for PowerPC (32-bit only currently)
     48  */
     49 #ifndef MACHINE
     50 #define	MACHINE		"powerpc"
     51 #endif
     52 #define	MACHINE_ARCH	"powerpc"
     53 #define	MID_MACHINE	MID_POWERPC
     54 
     55 #define	ALIGNBYTES		(sizeof(double) - 1)
     56 #define	ALIGN(p)		(((u_long)(p) + ALIGNBYTES) & ~ALIGNBYTES)
     57 #define	ALIGNED_POINTER(p,t)	((((u_long)(p)) & (sizeof(t)-1)) == 0)
     58 
     59 #ifdef PPC_IBM4XX
     60 #define	PGSHIFT		14	/* Use 16KB to reduce TLB thrashing */
     61 #define	UPAGES		1
     62 #else
     63 #define	PGSHIFT		12
     64 #define	UPAGES		4
     65 #endif
     66 #define	NBPG		(1 << PGSHIFT)	/* Page size */
     67 #define	PGOFSET		(NBPG - 1)
     68 
     69 #define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
     70 #define	DEV_BSIZE	(1 << DEV_BSHIFT)
     71 #define	BLKDEV_IOSIZE	NBPG
     72 #ifndef MAXPHYS
     73 #define	MAXPHYS		(64 * 1024)	/* max raw I/O transfer size */
     74 #endif
     75 
     76 #define	USPACE		(UPAGES * NBPG)
     77 
     78 #ifndef	MSGBUFSIZE
     79 #define	MSGBUFSIZE	(2*NBPG)	/* default message buffer size */
     80 #endif
     81 
     82 #ifndef KERNBASE
     83 #define	KERNBASE	0x100000
     84 #endif
     85 
     86 /*
     87  * Constants related to network buffer management.
     88  * MCLBYTES must be no larger than NBPG (the software page size), and,
     89  * on machines that exchange pages of input or output buffers with mbuf
     90  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
     91  * of the hardware page size.
     92  */
     93 #define	MSIZE		256		/* size of an mbuf */
     94 #define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
     95 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
     96 
     97 #ifndef NMBCLUSTERS
     98 
     99 #if defined(_KERNEL_OPT)
    100 #include "opt_gateway.h"
    101 #endif
    102 
    103 #ifdef GATEWAY
    104 #define	NMBCLUSTERS	2048		/* map size, max cluster allocation */
    105 #else
    106 #define	NMBCLUSTERS	1024		/* map size, max cluster allocation */
    107 #endif
    108 #endif
    109 
    110 /*
    111  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
    112  * logical pages.
    113  */
    114 #ifndef NKMEMPAGES_MIN_DEFAULT
    115 #define	NKMEMPAGES_MIN_DEFAULT	((16 * 1024 * 1024) >> PAGE_SHIFT)
    116 #endif
    117 #ifndef NKMEMPAGES_MAX_DEFAULT
    118 #define	NKMEMPAGES_MAX_DEFAULT	((128 * 1024 * 1024) >> PAGE_SHIFT)
    119 #endif
    120 
    121 /*
    122  * pages ("clicks") to disk blocks
    123  */
    124 #define	ctod(x)		((x) << (PGSHIFT - DEV_BSHIFT))
    125 #define	dtoc(x)		((x) >> (PGSHIFT - DEV_BSHIFT))
    126 /*
    127  * bytes to pages
    128  */
    129 #define	ctob(x)		((x) << PGSHIFT)
    130 #define	btoc(x)		(((x) + PGOFSET) >> PGSHIFT)
    131 
    132 /*
    133  * bytes to disk blocks
    134  */
    135 #define	dbtob(x)	((x) << DEV_BSHIFT)
    136 #define	btodb(x)	((x) >> DEV_BSHIFT)
    137 
    138 #endif /* _POWERPC_PARAM_H_ */
    139