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param.h revision 1.63 
      1 /*      $NetBSD: param.h,v 1.63 2020/05/01 08:21:27 isaki 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	UPAGES		2		/* pages of u-area */
     61 #define USPACE		(NBPG*UPAGES)
     62 #define	REDZONEADDR	(VAX_NBPG*3)	/* Must be > sizeof(struct pcb) */
     63 
     64 #ifndef MSGBUFSIZE
     65 #define MSGBUFSIZE	NBPG		/* default message buffer size */
     66 #endif
     67 
     68 /*
     69  * KVA is very tight on vax, reduce the amount of KVA used by pipe
     70  * "direct" write code to reasonably low value.
     71  */
     72 #ifndef PIPE_DIRECT_CHUNK
     73 #define PIPE_DIRECT_CHUNK	65536
     74 #endif
     75 
     76 /*
     77  * Constants related to network buffer management.
     78  * MCLBYTES must be no larger than NBPG (the software page size), and,
     79  * on machines that exchange pages of input or output buffers with mbuf
     80  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
     81  * of the hardware page size.
     82  */
     83 #define	MSIZE		256		/* size of an mbuf */
     84 
     85 #ifndef	MCLSHIFT
     86 #define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
     87 					/* 2K cluster can hold Ether frame */
     88 #endif	/* MCLSHIFT */
     89 
     90 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
     91 
     92 /*
     93  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
     94  * logical pages.
     95  */
     96 #define	NKMEMPAGES_MIN_DEFAULT	((4 * 1024 * 1024) >> PAGE_SHIFT)
     97 #define	NKMEMPAGES_MAX_DEFAULT	((4 * 1024 * 1024) >> PAGE_SHIFT)
     98 
     99 /*
    100  * Some macros for units conversion
    101  */
    102 
    103 #define	btop(x)		((x) >> PGSHIFT)
    104 
    105 /* MD conversion macros */
    106 #define	vax_btoc(x)	(((unsigned)(x) + VAX_PGOFSET) >> VAX_PGSHIFT)
    107 #define	vax_btop(x)	(((unsigned)(x)) >> VAX_PGSHIFT)
    108 
    109 #ifdef _KERNEL
    110 #include <machine/intr.h>
    111 
    112 /* Prototype needed for delay() */
    113 #ifndef	_LOCORE
    114 void	delay(int);
    115 /* inline macros used inside kernel */
    116 #include <machine/macros.h>
    117 #endif
    118 
    119 #define	DELAY(x) delay(x)
    120 #define	MAXEXEC	1
    121 
    122 /* Default audio blocksize in msec.  See sys/dev/audio/audio.c */
    123 #define	__AUDIO_BLK_MS (40)
    124 
    125 #endif /* _KERNEL */
    126 
    127 #endif /* _VAX_PARAM_H_ */
    128