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param.h revision 1.64 
      1 /*      $NetBSD: param.h,v 1.64 2021/05/31 14:38:56 simonb 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 #ifdef _KERNEL_OPT
     40 #include "opt_param.h"
     41 #endif
     42 
     43 /*
     44  * Machine dependent constants for VAX.
     45  */
     46 
     47 #define	_MACHINE	vax
     48 #define	MACHINE		"vax"
     49 #define	_MACHINE_ARCH	vax
     50 #define	MACHINE_ARCH	"vax"
     51 #define	MID_MACHINE	MID_VAX
     52 
     53 #define	PGSHIFT		12			/* LOG2(NBPG) */
     54 #define	NBPG		(1 << PGSHIFT)		/* (1 << PGSHIFT) bytes/page */
     55 #define	PGOFSET		(NBPG - 1)		/* byte offset into page */
     56 
     57 #define	VAX_PGSHIFT	9
     58 #define	VAX_NBPG	(1 << VAX_PGSHIFT)
     59 #define	VAX_PGOFSET	(VAX_NBPG - 1)
     60 #define	VAX_NPTEPG	(VAX_NBPG / 4)
     61 
     62 #define	KERNBASE	0x80000000		/* start of kernel virtual */
     63 
     64 #define	UPAGES		2		/* pages of u-area */
     65 #define USPACE		(NBPG*UPAGES)
     66 #define	REDZONEADDR	(VAX_NBPG*3)	/* Must be > sizeof(struct pcb) */
     67 
     68 #ifndef MSGBUFSIZE
     69 #define MSGBUFSIZE	NBPG		/* default message buffer size */
     70 #endif
     71 
     72 /*
     73  * KVA is very tight on vax, reduce the amount of KVA used by pipe
     74  * "direct" write code to reasonably low value.
     75  */
     76 #ifndef PIPE_DIRECT_CHUNK
     77 #define PIPE_DIRECT_CHUNK	65536
     78 #endif
     79 
     80 /*
     81  * Constants related to network buffer management.
     82  * MCLBYTES must be no larger than NBPG (the software page size), and,
     83  * on machines that exchange pages of input or output buffers with mbuf
     84  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
     85  * of the hardware page size.
     86  */
     87 #define	MSIZE		256		/* size of an mbuf */
     88 
     89 #ifndef	MCLSHIFT
     90 #define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
     91 					/* 2K cluster can hold Ether frame */
     92 #endif	/* MCLSHIFT */
     93 
     94 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
     95 
     96 /*
     97  * Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
     98  * logical pages.
     99  */
    100 #define	NKMEMPAGES_MIN_DEFAULT	((4 * 1024 * 1024) >> PAGE_SHIFT)
    101 #define	NKMEMPAGES_MAX_DEFAULT	((4 * 1024 * 1024) >> PAGE_SHIFT)
    102 
    103 /*
    104  * Some macros for units conversion
    105  */
    106 
    107 #define	btop(x)		((x) >> PGSHIFT)
    108 
    109 /* MD conversion macros */
    110 #define	vax_btoc(x)	(((unsigned)(x) + VAX_PGOFSET) >> VAX_PGSHIFT)
    111 #define	vax_btop(x)	(((unsigned)(x)) >> VAX_PGSHIFT)
    112 
    113 #ifdef _KERNEL
    114 #include <machine/intr.h>
    115 
    116 /* Prototype needed for delay() */
    117 #ifndef	_LOCORE
    118 void	delay(int);
    119 /* inline macros used inside kernel */
    120 #include <machine/macros.h>
    121 #endif
    122 
    123 #define	DELAY(x) delay(x)
    124 #define	MAXEXEC	1
    125 
    126 /* Default audio blocksize in msec.  See sys/dev/audio/audio.c */
    127 #define	__AUDIO_BLK_MS (40)
    128 
    129 #endif /* _KERNEL */
    130 
    131 #endif /* _VAX_PARAM_H_ */
    132