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param.h revision 1.76 
      1 /*	$NetBSD: param.h,v 1.76 2012/02/10 17:35:49 para 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 #include <machine/cpu.h>
     46 #endif
     47 
     48 #define	_MACHINE	i386
     49 #define	MACHINE		"i386"
     50 #define	_MACHINE_ARCH	i386
     51 #define	MACHINE_ARCH	"i386"
     52 #define	MID_MACHINE	MID_I386
     53 
     54 #define ALIGNED_POINTER(p,t)	1
     55 
     56 #define	PGSHIFT		12		/* LOG2(NBPG) */
     57 #define	NBPG		(1 << PGSHIFT)	/* bytes/page */
     58 #define	PGOFSET		(NBPG-1)	/* byte offset into page */
     59 #define	NPTEPG		(NBPG/(sizeof (pt_entry_t)))
     60 
     61 #if defined(_KERNEL_OPT)
     62 #include "opt_kernbase.h"
     63 #endif /* defined(_KERNEL_OPT) */
     64 
     65 #ifdef KERNBASE_LOCORE
     66 #error "You should only re-define KERNBASE"
     67 #endif
     68 
     69 #ifndef	KERNBASE
     70 #define	KERNBASE	0xc0000000UL	/* start of kernel virtual space */
     71 #endif
     72 
     73 #define	KERNTEXTOFF	(KERNBASE + 0x100000) /* start of kernel text */
     74 #define	BTOPKERNBASE	(KERNBASE >> PGSHIFT)
     75 
     76 #define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
     77 #define	DEV_BSIZE	(1 << DEV_BSHIFT)
     78 #define	BLKDEV_IOSIZE	2048
     79 #ifndef	MAXPHYS
     80 #define	MAXPHYS		(64 * 1024)	/* max raw I/O transfer size */
     81 #endif
     82 
     83 #define	SSIZE		1		/* initial stack size/NBPG */
     84 #define	SINCR		1		/* increment of stack/NBPG */
     85 
     86 #ifndef UPAGES
     87 # ifdef DIAGNOSTIC
     88 #  define	UPAGES		3	/* 2 + 1 page for redzone */
     89 # else
     90 #  define	UPAGES		2	/* normal pages of u-area */
     91 # endif /* DIAGNOSTIC */
     92 #endif /* !defined(UPAGES) */
     93 #define	USPACE		(UPAGES * NBPG)	/* total size of u-area */
     94 #define	INTRSTACKSIZE	8192
     95 
     96 #ifndef MSGBUFSIZE
     97 #define MSGBUFSIZE	8*NBPG		/* default message buffer size */
     98 #endif
     99 
    100 /*
    101  * Constants related to network buffer management.
    102  * MCLBYTES must be no larger than NBPG (the software page size), and,
    103  * on machines that exchange pages of input or output buffers with mbuf
    104  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
    105  * of the hardware page size.
    106  */
    107 #define	MSIZE		256		/* size of an mbuf */
    108 
    109 #ifndef MCLSHIFT
    110 #define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
    111 					/* 2K cluster can hold Ether frame */
    112 #endif	/* MCLSHIFT */
    113 
    114 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
    115 
    116 #ifndef NMBCLUSTERS_MAX
    117 #define	NMBCLUSTERS_MAX	(0x2000000 / MCLBYTES)	/* Limit to 64MB for clusters */
    118 #endif
    119 
    120 #ifndef NFS_RSIZE
    121 #define NFS_RSIZE	32768
    122 #endif
    123 #ifndef NFS_WSIZE
    124 #define NFS_WSIZE	32768
    125 #endif
    126 
    127 /*
    128  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
    129  * logical pages.
    130  */
    131 #define	NKMEMPAGES_MIN_DEFAULT	((16 * 1024 * 1024) >> PAGE_SHIFT)
    132 #define	NKMEMPAGES_MAX_DEFAULT	((360 * 1024 * 1024) >> PAGE_SHIFT)
    133 
    134 /*
    135  * Mach derived conversion macros
    136  */
    137 #define	x86_round_pdr(x) \
    138 	((((unsigned long)(x)) + (NBPD_L2 - 1)) & ~(NBPD_L2 - 1))
    139 #define	x86_trunc_pdr(x)	((unsigned long)(x) & ~(NBPD_L2 - 1))
    140 #define	x86_btod(x)		((unsigned long)(x) >> L2_SHIFT)
    141 #define	x86_dtob(x)		((unsigned long)(x) << L2_SHIFT)
    142 #define	x86_round_page(x)	((((paddr_t)(x)) + PGOFSET) & ~PGOFSET)
    143 #define	x86_trunc_page(x)	((paddr_t)(x) & ~PGOFSET)
    144 #define	x86_btop(x)		((paddr_t)(x) >> PGSHIFT)
    145 #define	x86_ptob(x)		((paddr_t)(x) << PGSHIFT)
    146 
    147 #endif /* _I386_PARAM_H_ */
    148