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param.h revision 1.5.2.1 
      1 /*	$NetBSD: param.h,v 1.5.2.1 1999/12/21 23:16:05 wrstuden 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 #ifdef	_KERNEL
     35 #ifndef	_LOCORE
     36 #include <machine/cpu.h>
     37 #endif	/* _LOCORE */
     38 #endif
     39 
     40 /*
     41  * Machine dependent constants for PowerPC (32-bit only currently)
     42  */
     43 #define	MACHINE		"macppc"
     44 #define	MACHINE_ARCH	"powerpc"
     45 #define	MID_MACHINE	MID_POWERPC
     46 
     47 #define	ALIGNBYTES		(sizeof(double) - 1)
     48 #define	ALIGN(p)		(((u_int)(p) + ALIGNBYTES) & ~ALIGNBYTES)
     49 #define	ALIGNED_POINTER(p,t)	((((u_long)(p)) & (sizeof(t)-1)) == 0)
     50 
     51 #define	PGSHIFT		12
     52 #define	NBPG		(1 << PGSHIFT)	/* Page size */
     53 #define	PGOFSET		(NBPG - 1)
     54 
     55 #define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
     56 #define	DEV_BSIZE	(1 << DEV_BSHIFT)
     57 #define	BLKDEV_IOSIZE	NBPG
     58 #define	MAXPHYS		(64 * 1024)	/* max raw I/O transfer size */
     59 
     60 #define	CLSIZELOG2	0
     61 #define	CLSIZE		(1 << CLSIZELOG2)
     62 
     63 #define	UPAGES		4
     64 #define	USPACE		(UPAGES * NBPG)
     65 
     66 #ifndef MSGBUFSIZE
     67 #define	MSGBUFSIZE	NBPG		/* default message buffer size */
     68 #endif
     69 
     70 #define	KERNBASE	0x100000
     71 
     72 /*
     73  * Constants related to network buffer management.
     74  * MCLBYTES must be no larger than CLBYTES (the software page size), and,
     75  * on machines that exchange pages of input or output buffers with mbuf
     76  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
     77  * of the hardware page size.
     78  */
     79 #define	MSIZE		128		/* size of an mbuf */
     80 #define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
     81 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
     82 
     83 #ifndef NMBCLUSTERS
     84 
     85 #if defined(_KERNEL) && !defined(_LKM)
     86 #include "opt_gateway.h"
     87 #include "opt_non_po2_blocks.h"
     88 #endif /* _KERNEL && ! _LKM */
     89 
     90 #ifdef GATEWAY
     91 #define	NMBCLUSTERS	512		/* map size, max cluster allocation */
     92 #else
     93 #define	NMBCLUSTERS	256		/* map size, max cluster allocation */
     94 #endif
     95 #endif
     96 
     97 /*
     98  * Size of kernel malloc arena in CLBYTES-sized logical pages.
     99  */
    100 #ifndef	NKMEMCLUSTERS
    101 #define	NKMEMCLUSTERS	(8 * 1024 * 1024 / CLBYTES)
    102 #endif
    103 
    104 /*
    105  * pages ("clicks") to disk blocks
    106  */
    107 #define	ctod(x, sh)		((x) << (PGSHIFT - (sh)))
    108 #define	dtoc(x, sh)		((x) >> (PGSHIFT - (sh)))
    109 /*
    110  * bytes to pages
    111  */
    112 #define	ctob(x)		((x) << PGSHIFT)
    113 #define	btoc(x)		(((x) + PGOFSET) >> PGSHIFT)
    114 
    115 /*
    116  * bytes to disk blocks
    117  */
    118 #if defined(_LKM) || defined(NON_PO2_BLOCKS)
    119 #define	dbtob(x, sh)	(((sh) >= 0) ? ((x) << (sh)) : ((x) * (-sh)))
    120 #define	btodb(x, sh)	(((sh) >= 0) ? ((x) >> (sh)) : ((x) / (-sh)))
    121 #define	blocksize(sh)	(((sh) >= 0) ? (1 << (sh))   : (-sh))
    122 #else
    123 #define	dbtob(x, sh)	((x) << (sh))
    124 #define	btodb(x, sh)	((x) >> (sh))
    125 #define	blocksize(sh)	(((sh) >= 0) ? (1 << (sh))   : (0))
    126 #endif
    127 
    128 /*
    129  * Segment handling stuff
    130  */
    131 #define	SEGMENT_LENGTH	0x10000000
    132 #define	SEGMENT_MASK	0xf0000000
    133 
    134 /*
    135  * Fixed segments
    136  */
    137 #define	USER_SR		13
    138 #define	KERNEL_SR	14
    139 #define	KERNEL_SEGMENT	(0xfffff0 + KERNEL_SR)
    140 #define	EMPTY_SEGMENT	0xfffff0
    141 #define	USER_ADDR	((void *)(USER_SR << ADDR_SR_SHFT))
    142 
    143 /*
    144  * Some system constants
    145  */
    146 #ifndef	NPMAPS
    147 #define	NPMAPS		32768	/* Number of pmaps in system */
    148 #endif
    149