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param.h revision 1.1 
      1 /*	$NetBSD: param.h,v 1.1 2001/02/04 18:32:14 briggs 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		"sandpoint"
     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	UPAGES		4
     61 #define	USPACE		(UPAGES * NBPG)
     62 
     63 #ifndef	MSGBUFSIZE
     64 #define	MSGBUFSIZE	NBPG		/* default message buffer size */
     65 #endif
     66 
     67 #define	__NO_FIXED_MSGBUF
     68 
     69 #define	KERNBASE	0x3100
     70 
     71 /*
     72  * Constants related to network buffer management.
     73  * MCLBYTES must be no larger than NBPG (the software page size), and,
     74  * on machines that exchange pages of input or output buffers with mbuf
     75  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
     76  * of the hardware page size.
     77  */
     78 #define	MSIZE		256		/* size of an mbuf */
     79 #define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
     80 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
     81 
     82 #ifndef NMBCLUSTERS
     83 
     84 #if defined(_KERNEL) && !defined(_LKM)
     85 #include "opt_gateway.h"
     86 #endif /* _KERNEL && ! _LKM */
     87 
     88 #ifdef GATEWAY
     89 #define	NMBCLUSTERS	2048		/* map size, max cluster allocation */
     90 #else
     91 #define	NMBCLUSTERS	1024		/* map size, max cluster allocation */
     92 #endif
     93 #endif
     94 
     95 /*
     96  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
     97  * logical pages.
     98  */
     99 #define	NKMEMPAGES_MIN_DEFAULT	((128 * 1024 * 1024) >> PAGE_SHIFT)
    100 #define	NKMEMPAGES_MAX_DEFAULT	((128 * 1024 * 1024) >> PAGE_SHIFT)
    101 
    102 /*
    103  * pages ("clicks") to disk blocks
    104  */
    105 #define	ctod(x)		((x) << (PGSHIFT - DEV_BSHIFT))
    106 #define	dtoc(x)		((x) >> (PGSHIFT - DEV_BSHIFT))
    107 /*
    108  * bytes to pages
    109  */
    110 #define	ctob(x)		((x) << PGSHIFT)
    111 #define	btoc(x)		(((x) + PGOFSET) >> PGSHIFT)
    112 
    113 /*
    114  * bytes to disk blocks
    115  */
    116 #define	dbtob(x)	((x) << DEV_BSHIFT)
    117 #define	btodb(x)	((x) >> DEV_BSHIFT)
    118 
    119 /*
    120  * Segment handling stuff
    121  */
    122 #define	SEGMENT_LENGTH	0x10000000
    123 #define	SEGMENT_MASK	0xf0000000
    124 
    125 /*
    126  * Fixed segments
    127  */
    128 #define	USER_SR		13
    129 #define	KERNEL_SR	14
    130 #define	KERNEL_SEGMENT	(0xfffff0 + KERNEL_SR)
    131 #define	EMPTY_SEGMENT	0xfffff0
    132 #define	USER_ADDR	((void *)(USER_SR << ADDR_SR_SHFT))
    133 
    134 /*
    135  * Some system constants
    136  */
    137 #ifndef	NPMAPS
    138 #define	NPMAPS		32768	/* Number of pmaps in system */
    139 #endif
    140