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param.h revision 1.30
      1 /*	$NetBSD: param.h,v 1.30 1995/11/10 22:04:48 gwr Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1994, 1995 Gordon W. Ross
      5  * Copyright (c) 1993 Adam Glass
      6  * Copyright (c) 1988 University of Utah.
      7  * Copyright (c) 1982, 1986, 1990, 1993
      8  *	The Regents of the University of California.  All rights reserved.
      9  *
     10  * This code is derived from software contributed to Berkeley by
     11  * the Systems Programming Group of the University of Utah Computer
     12  * Science Department.
     13  *
     14  * Redistribution and use in source and binary forms, with or without
     15  * modification, are permitted provided that the following conditions
     16  * are met:
     17  * 1. Redistributions of source code must retain the above copyright
     18  *    notice, this list of conditions and the following disclaimer.
     19  * 2. Redistributions in binary form must reproduce the above copyright
     20  *    notice, this list of conditions and the following disclaimer in the
     21  *    documentation and/or other materials provided with the distribution.
     22  * 3. All advertising materials mentioning features or use of this software
     23  *    must display the following acknowledgement:
     24  *	This product includes software developed by the University of
     25  *	California, Berkeley and its contributors.
     26  * 4. Neither the name of the University nor the names of its contributors
     27  *    may be used to endorse or promote products derived from this software
     28  *    without specific prior written permission.
     29  *
     30  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     31  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     32  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     33  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     34  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     35  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     36  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     37  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     38  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     39  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     40  * SUCH DAMAGE.
     41  *
     42  *	from: Utah Hdr: machparam.h 1.16 92/12/20
     43  *	from: @(#)param.h	8.1 (Berkeley) 6/10/93
     44  */
     45 
     46 #ifndef	MACHINE
     47 
     48 /*
     49  * Machine dependent constants for the Sun3 series.
     50  */
     51 #define	MACHINE     "sun3"
     52 #define	MACHINE_ARCH	"m68k"
     53 #define MID_MACHINE MID_M68K
     54 
     55 /*
     56  * Round p (pointer or byte index) up to a correctly-aligned value
     57  * for all data types (int, long, ...).   The result is u_int and
     58  * must be cast to any desired pointer type.
     59  */
     60 #define	ALIGNBYTES	3
     61 #define	ALIGN(p)	(((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
     62 
     63 #define	NBPG		8192		/* bytes/page */
     64 #define	PGOFSET		(NBPG-1)	/* byte offset into page */
     65 #define	PGSHIFT		13		/* LOG2(NBPG) */
     66 
     67 #define NBSG		0x20000	/* bytes/segment */
     68 #define	SEGOFSET	(NBSG-1)	/* byte offset into segment */
     69 #define SEGSHIFT	17	        /* LOG2(NBSG) */
     70 
     71 #define	KERNBASE	0x0E000000	/* start of kernel virtual */
     72 #define	BTOPKERNBASE	((u_long)KERNBASE >> PGSHIFT)
     73 #define	KERNTEXTOFF	0x0E004000	/* start of kernel text */
     74 
     75 #define	DEV_BSIZE	512
     76 #define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
     77 #define BLKDEV_IOSIZE	2048
     78 #define	MAXPHYS		(64 * 1024)	/* max raw I/O transfer size */
     79 
     80 #define	CLSIZE		1
     81 #define	CLSIZELOG2	0
     82 
     83 /* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */
     84 #define	SSIZE		1		/* initial stack size/NBPG */
     85 #define	SINCR		1		/* increment of stack/NBPG */
     86 
     87 #define	UPAGES		2		/* pages of u-area */
     88 #define	USPACE		(UPAGES << PGSHIFT)
     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 #define	MSIZE		128		/* size of an mbuf */
     98 #define	MCLBYTES	2048		/* large enough for ether MTU */
     99 #define	MCLSHIFT	11
    100 #define	MCLOFSET	(MCLBYTES - 1)
    101 #ifndef NMBCLUSTERS
    102 #ifdef GATEWAY
    103 #define	NMBCLUSTERS	512		/* map size, max cluster allocation */
    104 #else
    105 #define	NMBCLUSTERS	256		/* map size, max cluster allocation */
    106 #endif
    107 #endif
    108 
    109 /*
    110  * Size of kernel malloc arena in CLBYTES-sized logical pages
    111  */
    112 #ifndef NKMEMCLUSTERS
    113 #define	NKMEMCLUSTERS	(2048*1024/CLBYTES)
    114 #endif
    115 
    116 /* pages ("clicks") to disk blocks */
    117 #define	ctod(x)		((x) << (PGSHIFT - DEV_BSHIFT))
    118 #define	dtoc(x)		((x) >> (PGSHIFT - DEV_BSHIFT))
    119 
    120 /* pages to bytes */
    121 #define	ctob(x)		((x) << PGSHIFT)
    122 #define	btoc(x)		(((x) + PGOFSET) >> PGSHIFT)
    123 
    124 /* bytes to disk blocks */
    125 #define	btodb(x)	((x) >> DEV_BSHIFT)
    126 #define	dbtob(x)	((x) << DEV_BSHIFT)
    127 
    128 /*
    129  * Map a ``block device block'' to a file system block.
    130  * This should be device dependent, and should use the bsize
    131  * field from the disk label.
    132  * For now though just use DEV_BSIZE.
    133  */
    134 #define	bdbtofsb(bn)	((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
    135 
    136 /*
    137  * Mach derived conversion macros
    138  */
    139 #define sun3_round_seg(x)	((((unsigned)(x)) + SEGOFSET) & ~SEGOFSET)
    140 #define sun3_trunc_seg(x)	((unsigned)(x) & ~SEGOFSET)
    141 #define sun3_btos(x)		((unsigned)(x) >> SEGSHIFT)
    142 #define sun3_stob(x)		((unsigned)(x) << SEGSHIFT)
    143 
    144 #define sun3_round_page(x)	((((unsigned)(x)) + PGOFSET) & ~PGOFSET)
    145 #define sun3_trunc_page(x)	((unsigned)(x) & ~PGOFSET)
    146 #define sun3_btop(x)		((unsigned)(x) >> PGSHIFT)
    147 #define sun3_ptob(x)		((unsigned)(x) << PGSHIFT)
    148 
    149 /* XXX - Does this really belong here? -gwr */
    150 #include <machine/psl.h>
    151 
    152 #ifdef _KERNEL
    153 #ifndef LOCORE
    154 #define	DELAY(n)	delay(n)
    155 extern int cpuspeed;
    156 static inline void delay2us()
    157 {
    158 	register int n = cpuspeed;
    159 
    160 	__asm __volatile ("0: subql #4,%0; jgt 0b" : "=d" (n) : "0" (n));
    161 }
    162 #endif	/* !LOCORE */
    163 #endif	/* _KERNEL */
    164 
    165 #endif	/* MACHINE */
    166