Home | History | Annotate | Line # | Download | only in include
param.h revision 1.5 
      1 /*	$NetBSD: param.h,v 1.5 2002/02/12 06:58:19 thorpej 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.  This is so that
     45  *	uname returns the correct thing, etc.
     46  *
     47  *	MACHINE_ARCH may be defined by individual ports as a temporary
     48  *	measure while we're finishing the conversion to ELF.
     49  *
     50  * For non-KERNEL code:
     51  *	If ELF, MACHINE and MACHINE_ARCH are forced to "arm".
     52  */
     53 
     54 #if defined(_KERNEL)
     55 #ifndef MACHINE_ARCH			/* XXX For now */
     56 #define	_MACHINE_ARCH	arm
     57 #define	MACHINE_ARCH	"arm"
     58 #endif
     59 #elif defined(__ELF__)
     60 #undef _MACHINE
     61 #define	_MACHINE	arm
     62 #undef MACHINE
     63 #define	MACHINE		"arm"
     64 
     65 #undef _MACHINE_ARCH
     66 #define	_MACHINE_ARCH	arm
     67 #undef MACHINE_ARCH
     68 #define	MACHINE_ARCH	"arm"
     69 #endif /* _KERNEL */
     70 
     71 #define	MID_MACHINE	MID_ARM6
     72 
     73 /*
     74  * Round p (pointer or byte index) up to a correctly-aligned value
     75  * for all data types (int, long, ...).   The result is u_int and
     76  * must be cast to any desired pointer type.
     77  *
     78  * ALIGNED_POINTER is a boolean macro that checks whether an address
     79  * is valid to fetch data elements of type t from on this architecture.
     80  * This does not reflect the optimal alignment, just the possibility
     81  * (within reasonable limits).
     82  *
     83  */
     84 #define ALIGNBYTES		(sizeof(int) - 1)
     85 #define ALIGN(p)		(((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
     86 #define ALIGNED_POINTER(p,t)	((((u_long)(p)) & (sizeof(t)-1)) == 0)
     87 /* ARM-specific macro to align a stack pointer (downwards). */
     88 #define STACKALIGNBYTES		(8 - 1)
     89 #define STACKALIGN(p)		((u_int)(p) &~ STACKALIGNBYTES)
     90 
     91 #define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
     92 #define	DEV_BSIZE	(1 << DEV_BSHIFT)
     93 #define	BLKDEV_IOSIZE	2048
     94 
     95 #ifndef MAXPHYS
     96 #define	MAXPHYS		65536		/* max I/O transfer size */
     97 #endif
     98 
     99 /* pages ("clicks") to disk blocks */
    100 #define	ctod(x)	((x) << (PGSHIFT - DEV_BSHIFT))
    101 #define	dtoc(x)	((x) >> (PGSHIFT - DEV_BSHIFT))
    102 /*#define	dtob(x)	((x) << DEV_BSHIFT)*/
    103 
    104 #define	ctob(x)	((x) << PGSHIFT)
    105 
    106 /* bytes to pages */
    107 #define	btoc(x)	(((x) + PGOFSET) >> PGSHIFT)
    108 
    109 #define	btodb(bytes)	 		/* calculates (bytes / DEV_BSIZE) */ \
    110 	((bytes) >> DEV_BSHIFT)
    111 #define	dbtob(db)			/* calculates (db * DEV_BSIZE) */ \
    112 	((db) << DEV_BSHIFT)
    113 
    114 /*
    115  * Map a ``block device block'' to a file system block.
    116  * This should be device dependent, and should use the bsize
    117  * field from the disk label.
    118  * For now though just use DEV_BSIZE.
    119  */
    120 #define	bdbtofsb(bn)	((bn) / (BLKDEV_IOSIZE / DEV_BSIZE))
    121 
    122 /*
    123  * Constants related to network buffer management.
    124  * MCLBYTES must be no larger than NBPG (the software page size), and,
    125  * on machines that exchange pages of input or output buffers with mbuf
    126  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
    127  * of the hardware page size.
    128  */
    129 #define	MSIZE		256		/* size of an mbuf */
    130 #define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
    131 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
    132 #define	MCLOFSET	(MCLBYTES - 1)	/* offset within a m_buf cluster */
    133 
    134 #endif /* _ARM_PARAM_H_ */
    135