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param.h revision 1.56 
      1 /*	$NetBSD: param.h,v 1.56 2003/08/07 16:27:59 agc Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990 The Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * William Jolitz.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  *	@(#)param.h	5.8 (Berkeley) 6/28/91
     35  */
     36 
     37 #ifndef _I386_PARAM_H_
     38 #define _I386_PARAM_H_
     39 
     40 /*
     41  * Machine dependent constants for Intel 386.
     42  */
     43 
     44 #ifdef _KERNEL
     45 #ifdef _LOCORE
     46 #include <machine/psl.h>
     47 #else
     48 #include <machine/cpu.h>
     49 #endif
     50 #endif
     51 
     52 #define	_MACHINE	i386
     53 #define	MACHINE		"i386"
     54 #define	_MACHINE_ARCH	i386
     55 #define	MACHINE_ARCH	"i386"
     56 #define	MID_MACHINE	MID_I386
     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)(u_long)(p) + ALIGNBYTES) &~ \
     71     ALIGNBYTES)
     72 #define ALIGNED_POINTER(p,t)	1
     73 
     74 #define	PGSHIFT		12		/* LOG2(NBPG) */
     75 #define	NBPG		(1 << PGSHIFT)	/* bytes/page */
     76 #define	PGOFSET		(NBPG-1)	/* byte offset into page */
     77 #define	NPTEPG		(NBPG/(sizeof (pt_entry_t)))
     78 
     79 #ifdef KERNBASE
     80 #ifndef KERNBASE_LOCORE
     81 #error you must define KERNBASE_LOCORE if you define KERNBASE.
     82 #endif
     83 #ifdef _LOCORE
     84 #undef KERNBASE
     85 #define KERNBASE KERNBASE_LOCORE
     86 #endif /* _LOCORE */
     87 #endif /* KERNBASE */
     88 
     89 #ifndef KERNBASE
     90 #ifndef _LOCORE
     91 #define	KERNBASE	0xc0000000UL	/* start of kernel virtual space */
     92 #else
     93 #define	KERNBASE	0xc0000000	/* start of kernel virtual space */
     94 #endif /* _LOCORE */
     95 #endif /* KERNBASE */
     96 
     97 #define	KERNTEXTOFF	(KERNBASE + 0x100000) /* start of kernel text */
     98 #define	BTOPKERNBASE	((u_long)KERNBASE >> PGSHIFT)
     99 
    100 #define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
    101 #define	DEV_BSIZE	(1 << DEV_BSHIFT)
    102 #define	BLKDEV_IOSIZE	2048
    103 #ifndef	MAXPHYS
    104 #define	MAXPHYS		(64 * 1024)	/* max raw I/O transfer size */
    105 #endif
    106 
    107 #define	SSIZE		1		/* initial stack size/NBPG */
    108 #define	SINCR		1		/* increment of stack/NBPG */
    109 
    110 #ifdef _KERNEL_OPT
    111 #include "opt_noredzone.h"
    112 #endif
    113 #ifdef NOREDZONE
    114 #define	UPAGES		2		/* pages of u-area */
    115 #else
    116 #define UPAGES		4
    117 #endif
    118 #define	USPACE		(UPAGES * NBPG)	/* total size of u-area */
    119 
    120 #ifndef MSGBUFSIZE
    121 #define MSGBUFSIZE	4*NBPG		/* default message buffer size */
    122 #endif
    123 
    124 /*
    125  * Constants related to network buffer management.
    126  * MCLBYTES must be no larger than NBPG (the software page size), and,
    127  * on machines that exchange pages of input or output buffers with mbuf
    128  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
    129  * of the hardware page size.
    130  */
    131 #define	MSIZE		256		/* size of an mbuf */
    132 
    133 #ifndef MCLSHIFT
    134 #define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
    135 					/* 2K cluster can hold Ether frame */
    136 #endif	/* MCLSHIFT */
    137 
    138 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
    139 
    140 #ifndef NMBCLUSTERS
    141 #if defined(_KERNEL_OPT)
    142 #include "opt_gateway.h"
    143 #endif
    144 
    145 #ifdef GATEWAY
    146 #define	NMBCLUSTERS	2048		/* map size, max cluster allocation */
    147 #else
    148 #define	NMBCLUSTERS	1024		/* map size, max cluster allocation */
    149 #endif
    150 #endif
    151 
    152 #ifndef NFS_RSIZE
    153 #define NFS_RSIZE	32768
    154 #endif
    155 #ifndef NFS_WSIZE
    156 #define NFS_WSIZE	32768
    157 #endif
    158 
    159 /*
    160  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
    161  * logical pages.
    162  */
    163 #define	NKMEMPAGES_MIN_DEFAULT	((8 * 1024 * 1024) >> PAGE_SHIFT)
    164 #define	NKMEMPAGES_MAX_DEFAULT	((128 * 1024 * 1024) >> PAGE_SHIFT)
    165 
    166 /* pages ("clicks") to disk blocks */
    167 #define	ctod(x)		((x) << (PGSHIFT - DEV_BSHIFT))
    168 #define	dtoc(x)		((x) >> (PGSHIFT - DEV_BSHIFT))
    169 
    170 /* bytes to pages */
    171 #define	ctob(x)		((x) << PGSHIFT)
    172 #define	btoc(x)		(((x) + PGOFSET) >> PGSHIFT)
    173 
    174 /* bytes to disk blocks */
    175 #define	dbtob(x)	((x) << DEV_BSHIFT)
    176 #define	btodb(x)	((x) >> DEV_BSHIFT)
    177 
    178 /*
    179  * Map a ``block device block'' to a file system block.
    180  * This should be device dependent, and should use the bsize
    181  * field from the disk label.
    182  * For now though just use DEV_BSIZE.
    183  */
    184 #define	bdbtofsb(bn)	((bn) / (BLKDEV_IOSIZE / DEV_BSIZE))
    185 
    186 /*
    187  * Mach derived conversion macros
    188  */
    189 #define	x86_round_pdr(x)	((((unsigned)(x)) + PDOFSET) & ~PDOFSET)
    190 #define	x86_trunc_pdr(x)	((unsigned)(x) & ~PDOFSET)
    191 #define	x86_btod(x)		((unsigned)(x) >> PDSHIFT)
    192 #define	x86_dtob(x)		((unsigned)(x) << PDSHIFT)
    193 #define	x86_round_page(x)	((((unsigned)(x)) + PGOFSET) & ~PGOFSET)
    194 #define	x86_trunc_page(x)	((unsigned)(x) & ~PGOFSET)
    195 #define	x86_btop(x)		((unsigned)(x) >> PGSHIFT)
    196 #define	x86_ptob(x)		((unsigned)(x) << PGSHIFT)
    197 
    198 #endif /* _I386_PARAM_H_ */
    199