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param.h revision 1.4 
      1 /*	$NetBSD: param.h,v 1.4 2001/08/07 22:54:00 bjh21 Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1994,1995 Mark Brinicombe.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the RiscBSD team.
     18  * 4. The name "RiscBSD" nor the name of the author may be used to
     19  *    endorse or promote products derived from this software without specific
     20  *    prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY RISCBSD ``AS IS'' AND ANY EXPRESS OR IMPLIED
     23  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     24  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL RISCBSD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
     26  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     27  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     28  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #ifndef	_ARM_PARAM_H_
     36 #define	_ARM_PARAM_H_
     37 
     38 /*
     39  * Machine dependent constants for all ARM processors
     40  */
     41 
     42 /*
     43  * For KERNEL code:
     44  *	MACHINE must be defined by the individual port.
     45  *	MACHINE_ARCH may be defined by an individual port.
     46  *
     47  * For non-KERNEL code:
     48  *	MACHINE && MACHINE_ARCH default to "arm"
     49  */
     50 
     51 #ifndef _KERNEL
     52 #ifndef MACHINE
     53 #define	MACHINE		"arm"
     54 #endif
     55 #endif /* !_KERNEL */
     56 
     57 #ifndef MACHINE_ARCH
     58 #define	MACHINE_ARCH	"arm"
     59 #endif
     60 
     61 #define	MID_MACHINE	MID_ARM6
     62 
     63 /*
     64  * Round p (pointer or byte index) up to a correctly-aligned value
     65  * for all data types (int, long, ...).   The result is u_int and
     66  * must be cast to any desired pointer type.
     67  *
     68  * ALIGNED_POINTER is a boolean macro that checks whether an address
     69  * is valid to fetch data elements of type t from on this architecture.
     70  * This does not reflect the optimal alignment, just the possibility
     71  * (within reasonable limits).
     72  *
     73  */
     74 #define ALIGNBYTES		(sizeof(int) - 1)
     75 #define ALIGN(p)		(((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
     76 #define ALIGNED_POINTER(p,t)	((((u_long)(p)) & (sizeof(t)-1)) == 0)
     77 /* ARM-specific macro to align a stack pointer (downwards). */
     78 #define STACKALIGNBYTES		(8 - 1)
     79 #define STACKALIGN(p)		((u_int)(p) &~ STACKALIGNBYTES)
     80 
     81 #define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
     82 #define	DEV_BSIZE	(1 << DEV_BSHIFT)
     83 #define	BLKDEV_IOSIZE	2048
     84 
     85 #ifndef MAXPHYS
     86 #define	MAXPHYS		65536		/* max I/O transfer size */
     87 #endif
     88 
     89 /* pages ("clicks") to disk blocks */
     90 #define	ctod(x)	((x) << (PGSHIFT - DEV_BSHIFT))
     91 #define	dtoc(x)	((x) >> (PGSHIFT - DEV_BSHIFT))
     92 /*#define	dtob(x)	((x) << DEV_BSHIFT)*/
     93 
     94 #define	ctob(x)	((x) << PGSHIFT)
     95 
     96 /* bytes to pages */
     97 #define	btoc(x)	(((x) + PGOFSET) >> PGSHIFT)
     98 
     99 #define	btodb(bytes)	 		/* calculates (bytes / DEV_BSIZE) */ \
    100 	((bytes) >> DEV_BSHIFT)
    101 #define	dbtob(db)			/* calculates (db * DEV_BSIZE) */ \
    102 	((db) << DEV_BSHIFT)
    103 
    104 /*
    105  * Map a ``block device block'' to a file system block.
    106  * This should be device dependent, and should use the bsize
    107  * field from the disk label.
    108  * For now though just use DEV_BSIZE.
    109  */
    110 #define	bdbtofsb(bn)	((bn) / (BLKDEV_IOSIZE / DEV_BSIZE))
    111 
    112 /*
    113  * Constants related to network buffer management.
    114  * MCLBYTES must be no larger than NBPG (the software page size), and,
    115  * on machines that exchange pages of input or output buffers with mbuf
    116  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
    117  * of the hardware page size.
    118  */
    119 #define	MSIZE		256		/* size of an mbuf */
    120 #define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
    121 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
    122 #define	MCLOFSET	(MCLBYTES - 1)	/* offset within a m_buf cluster */
    123 
    124 #endif /* _ARM_PARAM_H_ */
    125