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param.h revision 1.58.10.1 
      1 /*      $NetBSD: param.h,v 1.58.10.1 2012/04/17 00:07:01 yamt Exp $    */
      2 /*-
      3  * Copyright (c) 1990 The Regents of the University of California.
      4  * All rights reserved.
      5  *
      6  * This code is derived from software contributed to Berkeley by
      7  * William Jolitz.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  *
     33  *	@(#)param.h	5.8 (Berkeley) 6/28/91
     34  */
     35 
     36 #ifndef _VAX_PARAM_H_
     37 #define _VAX_PARAM_H_
     38 
     39 /*
     40  * Machine dependent constants for VAX.
     41  */
     42 
     43 #define	_MACHINE	vax
     44 #define	MACHINE		"vax"
     45 #define	_MACHINE_ARCH	vax
     46 #define	MACHINE_ARCH	"vax"
     47 #define	MID_MACHINE	MID_VAX
     48 
     49 #define	PGSHIFT		12			/* LOG2(NBPG) */
     50 #define	NBPG		(1 << PGSHIFT)		/* (1 << PGSHIFT) bytes/page */
     51 #define	PGOFSET		(NBPG - 1)		/* byte offset into page */
     52 
     53 #define	VAX_PGSHIFT	9
     54 #define	VAX_NBPG	(1 << VAX_PGSHIFT)
     55 #define	VAX_PGOFSET	(VAX_NBPG - 1)
     56 #define	VAX_NPTEPG	(VAX_NBPG / 4)
     57 
     58 #define	KERNBASE	0x80000000		/* start of kernel virtual */
     59 
     60 #define	DEV_BSHIFT	9		               /* log2(DEV_BSIZE) */
     61 #define	DEV_BSIZE	(1 << DEV_BSHIFT)
     62 
     63 #define BLKDEV_IOSIZE	2048
     64 #define	MAXPHYS		(64 * 1024)	/* max raw I/O transfer size */
     65 #define	MAXBSIZE	0x4000		/* max FS block size - XXX */
     66 
     67 #define	UPAGES		2		/* pages of u-area */
     68 #define USPACE		(NBPG*UPAGES)
     69 #define	REDZONEADDR	(VAX_NBPG*3)	/* Must be > sizeof(struct pcb) */
     70 
     71 #ifndef MSGBUFSIZE
     72 #define MSGBUFSIZE	NBPG		/* default message buffer size */
     73 #endif
     74 
     75 /*
     76  * KVA is very tight on vax, reduce the amount of KVA used by pipe
     77  * "direct" write code to reasonably low value.
     78  */
     79 #ifndef PIPE_DIRECT_CHUNK
     80 #define PIPE_DIRECT_CHUNK	65536
     81 #endif
     82 
     83 /*
     84  * Constants related to network buffer management.
     85  * MCLBYTES must be no larger than NBPG (the software page size), and,
     86  * on machines that exchange pages of input or output buffers with mbuf
     87  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
     88  * of the hardware page size.
     89  */
     90 #define	MSIZE		256		/* size of an mbuf */
     91 
     92 #ifndef	MCLSHIFT
     93 #define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
     94 					/* 2K cluster can hold Ether frame */
     95 #endif	/* MCLSHIFT */
     96 
     97 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
     98 
     99 /*
    100  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
    101  * logical pages.
    102  */
    103 #define	NKMEMPAGES_MIN_DEFAULT	((4 * 1024 * 1024) >> PAGE_SHIFT)
    104 #define	NKMEMPAGES_MAX_DEFAULT	((4 * 1024 * 1024) >> PAGE_SHIFT)
    105 
    106 /*
    107  * Some macros for units conversion
    108  */
    109 
    110 #define	btop(x)		((x) >> PGSHIFT)
    111 
    112 /* MD conversion macros */
    113 #define	vax_btoc(x)	(((unsigned)(x) + VAX_PGOFSET) >> VAX_PGSHIFT)
    114 #define	vax_btop(x)	(((unsigned)(x)) >> VAX_PGSHIFT)
    115 
    116 #ifdef _KERNEL
    117 #include <machine/intr.h>
    118 
    119 /* Prototype needed for delay() */
    120 #ifndef	_LOCORE
    121 void	delay(int);
    122 /* inline macros used inside kernel */
    123 #include <machine/macros.h>
    124 #endif
    125 
    126 #define	DELAY(x) delay(x)
    127 #define	MAXEXEC	1
    128 #endif /* _KERNEL */
    129 
    130 #endif /* _VAX_PARAM_H_ */
    131