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param.h revision 1.5.18.2 
      1 /*	$NetBSD: param.h,v 1.5.18.2 1999/12/27 18:33:40 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		"powerpc"
     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	DEF_BSHIFT	9		/* log2(DEF_BSIZE) */
     56 #define	DEF_BSIZE	(1 << DEF_BSHIFT)
     57 #define	BLKDEV_IOSIZE	NBPG
     58 #define	MAXPHYS		(64 * 1024)	/* max raw I/O transfer size */
     59 
     60 #define	UPAGES		4
     61 #define	USPACE		(UPAGES * NBPG)
     62 
     63 #ifndef	MSGBUFSIZE
     64 #define	MSGBUFSIZE	NBPG		/* default message buffer size */
     65 #endif
     66 
     67 #define	KERNBASE	0x100000
     68 
     69 /*
     70  * Constants related to network buffer management.
     71  * MCLBYTES must be no larger than NBPG (the software page size), and,
     72  * on machines that exchange pages of input or output buffers with mbuf
     73  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
     74  * of the hardware page size.
     75  */
     76 #define	MSIZE		128		/* size of an mbuf */
     77 #define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
     78 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
     79 
     80 #ifndef NMBCLUSTERS
     81 
     82 #if defined(_KERNEL) && !defined(_LKM)
     83 #include "opt_gateway.h"
     84 #include "opt_non_po2_blocks.h"
     85 #endif /* _KERNEL && ! _LKM */
     86 
     87 #ifdef GATEWAY
     88 #define	NMBCLUSTERS	512		/* map size, max cluster allocation */
     89 #else
     90 #define	NMBCLUSTERS	256		/* map size, max cluster allocation */
     91 #endif
     92 #endif
     93 
     94 /*
     95  * Size of kernel malloc arena in NBPG-sized logical pages.
     96  */
     97 #ifndef	NKMEMCLUSTERS
     98 #define	NKMEMCLUSTERS	(128 * 1024 * 1024 / NBPG)
     99 #endif
    100 
    101 /*
    102  * pages ("clicks") to disk blocks
    103  */
    104 #define	ctod(x, sh)		((x) << (PGSHIFT - (sh)))
    105 #define	dtoc(x, sh)		((x) >> (PGSHIFT - (sh)))
    106 /*
    107  * bytes to pages
    108  */
    109 #define	ctob(x)		((x) << PGSHIFT)
    110 #define	btoc(x)		(((x) + PGOFSET) >> PGSHIFT)
    111 
    112 /*
    113  * bytes to disk blocks
    114  */
    115 #if defined(_LKM) || defined(NON_PO2_BLOCKS)
    116 #define	dbtob(x, sh)	(((sh) >= 0) ? ((x) << (sh)) : ((x) * (-sh)))
    117 #define	btodb(x, sh)	(((sh) >= 0) ? ((x) >> (sh)) : ((x) / (-sh)))
    118 #define	blocksize(sh)	(((sh) >= 0) ? (1 << (sh))   : (-sh))
    119 #else
    120 #define	dbtob(x, sh)	((x) << (sh))
    121 #define	btodb(x, sh)	((x) >> (sh))
    122 #define	blocksize(sh)	(((sh) >= 0) ? (1 << (sh))   : (0))
    123 #endif
    124 
    125 /*
    126  * Segment handling stuff
    127  */
    128 #define	SEGMENT_LENGTH	0x10000000
    129 #define	SEGMENT_MASK	0xf0000000
    130 
    131 /*
    132  * Fixed segments
    133  */
    134 #define	USER_SR		13
    135 #define	KERNEL_SR	14
    136 #define	KERNEL_SEGMENT	(0xfffff0 + KERNEL_SR)
    137 #define	EMPTY_SEGMENT	0xfffff0
    138 #define	USER_ADDR	((void *)(USER_SR << ADDR_SR_SHFT))
    139 
    140 /*
    141  * Some system constants
    142  */
    143 #ifndef	NPMAPS
    144 #define	NPMAPS		32768	/* Number of pmaps in system */
    145 #endif
    146