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param.h revision 1.22 
      1 /*      $NetBSD: param.h,v 1.22 1997/01/11 11:06:17 ragge 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. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed by the University of
     20  *	California, Berkeley and its contributors.
     21  * 4. Neither the name of the University nor the names of its contributors
     22  *    may be used to endorse or promote products derived from this software
     23  *    without specific prior written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35  * SUCH DAMAGE.
     36  *
     37  *	@(#)param.h	5.8 (Berkeley) 6/28/91
     38  */
     39 
     40 #ifndef _VAX_PARAM_H_
     41 #define _VAX_PARAM_H_
     42 
     43 #include <machine/macros.h>
     44 #include <machine/psl.h>
     45 
     46 /*
     47  * Machine dependent constants for VAX.
     48  */
     49 
     50 #define	_MACHINE	vax
     51 #define	MACHINE		"vax"
     52 #define	_MACHINE_ARCH	vax
     53 #define	MACHINE_ARCH	"vax"
     54 #define	MID_MACHINE	MID_VAX
     55 
     56 /*
     57  * Round p (pointer or byte index) up to a correctly-aligned value
     58  * for all data types (int, long, ...).   The result is u_int and
     59  * must be cast to any desired pointer type.
     60  */
     61 
     62 #define ALIGNBYTES	(sizeof(int) - 1)
     63 #define ALIGN(p)	(((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
     64 
     65 #define	PGSHIFT	 9                             /* LOG2(NBPG) */
     66 #define	NBPG     (1<<PGSHIFT)                  /* (1 << PGSHIFT) bytes/page */
     67 #define	PGOFSET	 (NBPG-1)	               /* byte offset into page */
     68 #define	NPTEPG	 (NBPG/(sizeof (struct pte)))
     69 
     70 #define	KERNBASE     0x80000000	               /* start of kernel virtual */
     71 #define	BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT)
     72 
     73 #define	DEV_BSHIFT   9		               /* log2(DEV_BSIZE) */
     74 #define	DEV_BSIZE    (1 << DEV_BSHIFT)
     75 
     76 #define BLKDEV_IOSIZE 2048
     77 #define	MAXPHYS		(63 * 1024)	/* max raw I/O transfer size */
     78 #define	MAXBSIZE	0x4000		/* max FS block size - XXX */
     79 
     80 #define	CLSIZELOG2    1
     81 #define	CLSIZE	      2
     82 
     83 /* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */
     84 #define	SSIZE	4		/* initial stack size/NBPG */
     85 #define	SINCR	4		/* increment of stack/NBPG */
     86 
     87 #define	UPAGES	16		/* pages of u-area */
     88 #define USPACE  (NBPG*UPAGES)
     89 
     90 /*
     91  * Constants related to network buffer management.
     92  * MCLBYTES must be no larger than CLBYTES (the software page size), and,
     93  * on machines that exchange pages of input or output buffers with mbuf
     94  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
     95  * of the hardware page size.
     96  */
     97 
     98 #ifndef	MSIZE
     99 #define	MSIZE		128		/* size of an mbuf */
    100 #endif	/* MSIZE */
    101 
    102 #ifndef	MCLSHIFT
    103 #define	MCLSHIFT	10		/* convert bytes to m_buf clusters */
    104 #endif	/* MCLSHIFT */
    105 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of an m_buf cluster */
    106 #define	MCLOFSET	(MCLBYTES - 1)	/* offset within an m_buf cluster */
    107 
    108 #ifndef NMBCLUSTERS
    109 #ifdef GATEWAY
    110 #define	NMBCLUSTERS	512		/* map size, max cluster allocation */
    111 #else
    112 #define	NMBCLUSTERS	256		/* map size, max cluster allocation */
    113 #endif	/* GATEWAY */
    114 #endif	/* NMBCLUSTERS */
    115 
    116 /*
    117  * Size of kernel malloc arena in CLBYTES-sized logical pages
    118  */
    119 
    120 #ifndef NKMEMCLUSTERS
    121 #define	NKMEMCLUSTERS	(2048*1024/CLBYTES)
    122 #endif
    123 
    124 /*
    125  * Some macros for units conversion
    126  */
    127 
    128 /* pages ("clicks") to disk blocks */
    129 #define	ctod(x)		((x) << (PGSHIFT - DEV_BSHIFT))
    130 #define	dtoc(x)		((x) >> (PGSHIFT - DEV_BSHIFT))
    131 
    132 /* clicks to bytes */
    133 #define	ctob(x)		((x) << PGSHIFT)
    134 #define	btoc(x)		(((x) + PGOFSET) >> PGSHIFT)
    135 #define	btop(x)		(((unsigned)(x)) >> PGSHIFT)
    136 
    137 /* bytes to disk blocks */
    138 #define	btodb(x)	((x) >> DEV_BSHIFT)
    139 #define	dbtob(x)	((x) << DEV_BSHIFT)
    140 
    141 /*
    142  * Map a ``block device block'' to a file system block.
    143  * This should be device dependent, and will be if we
    144  * add an entry to cdevsw/bdevsw for that purpose.
    145  * For now though just use DEV_BSIZE.
    146  */
    147 
    148 #define	bdbtofsb(bn)	((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
    149 
    150 #define splx(reg)                                       \
    151 ({                                                      \
    152         register int val;                               \
    153         asm __volatile ("mfpr $0x12,%0;mtpr %1,$0x12"	\
    154                         : "&=g" (val)                   \
    155                         : "g" (reg));                   \
    156         val;                                            \
    157 })
    158 
    159 
    160 #define	spl0()		splx(0)		/* IPL0  */
    161 #define splsoftclock()  splx(8)		/* IPL08 */
    162 #define splsoftnet()    splx(0xc)	/* IPL0C */
    163 #define	splddb()	splx(0xf)	/* IPL0F */
    164 #define splbio()        splx(0x15)	/* IPL15 */
    165 #define splnet()        splx(0x15)	/* IPL15 */
    166 #define spltty()        splx(0x15)	/* IPL15 */
    167 #define splimp()        splx(0x17)	/* IPL17 */
    168 #define splclock()      splx(0x18)	/* IPL18 */
    169 #define splhigh()       splx(0x1f)	/* IPL1F */
    170 #define	splstatclock()	splclock()
    171 
    172 /* These are better to use when playing with VAX buses */
    173 #define	spl4()		splx(0x14)
    174 #define	spl5()		splx(0x15)
    175 #define	spl6()		splx(0x16)
    176 #define	spl7()		splx(0x17)
    177 
    178 #define	ovbcopy(x,y,z)	bcopy(x,y,z)
    179 
    180 #if !defined(VAX410) && !defined(VAX43)
    181 #define vmapbuf(p,q)
    182 #define vunmapbuf(p,q)
    183 #endif
    184 
    185 /* Prototype needed for delay() */
    186 #ifndef	_LOCORE
    187 void	delay __P((int));
    188 #endif
    189 
    190 #define	DELAY(x) delay(x)
    191 
    192 #endif /* _VAX_PARAM_H_ */
    193