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param.h revision 1.18 
      1 /*	$NetBSD: param.h,v 1.18 2011/02/08 20:20:16 rmind Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988 University of Utah.
      5  * Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
      6  * All rights reserved.
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * the Systems Programming Group of the University of Utah Computer
     10  * Science Department.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  * from: Utah $Hdr: machparam.h 1.16 92/12/20$
     37  *
     38  *	@(#)param.h	8.1 (Berkeley) 6/10/93
     39  */
     40 
     41 #ifndef _M68K_PARAM_H_
     42 #define _M68K_PARAM_H_
     43 
     44 /*
     45  * Machine independent constants for m68k
     46  */
     47 #ifndef	MACHINE_ARCH
     48 #define	_MACHINE_ARCH	m68k
     49 #define	MACHINE_ARCH	"m68k"
     50 #endif
     51 #ifndef	MID_MACHINE
     52 #define	MID_MACHINE	MID_M68K
     53 #endif
     54 
     55 /*
     56  * Round p (pointer or byte index) up to a correctly-aligned value for all
     57  * data types (int, long, ...).   The result is u_int and must be cast to
     58  * any desired pointer type.
     59  *
     60  * ALIGNED_POINTER is a boolean macro that checks whether an address
     61  * is valid to fetch data elements of type t from on this architecture.
     62  * This does not reflect the optimal alignment, just the possibility
     63  * (within reasonable limits).
     64  *
     65  */
     66 #define ALIGNBYTES		(sizeof(int) - 1)
     67 #define	ALIGN(p)		(((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
     68 #define ALIGNED_POINTER(p,t)	((((u_long)(p)) & (sizeof(t)-1)) == 0)
     69 
     70 #define	NBPG		(1 << PGSHIFT)	/* bytes/page */
     71 #define	PGOFSET		(NBPG-1)	/* byte offset into page */
     72 
     73 #define	BTOPKERNBASE	((u_long)KERNBASE >> PGSHIFT)
     74 
     75 #define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
     76 #define	DEV_BSIZE	(1 << DEV_BSHIFT)
     77 #define BLKDEV_IOSIZE	2048
     78 #ifndef MAXPHYS
     79 #define	MAXPHYS		(64 * 1024)	/* max raw I/O transfer size */
     80 #endif
     81 
     82 #define	SSIZE		1		/* initial stack size/NBPG */
     83 #define	SINCR		1		/* increment of stack/NBPG */
     84 
     85 #define	USPACE		(UPAGES * NBPG)
     86 
     87 #ifndef MSGBUFSIZE
     88 #define MSGBUFSIZE	NBPG		/* default message buffer size */
     89 #endif
     90 
     91 /*
     92  * Constants related to network buffer management.
     93  * MCLBYTES must be no larger than NBPG (the software page size), and,
     94  * on machines that exchange pages of input or output buffers with mbuf
     95  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
     96  * of the hardware page size.
     97  */
     98 #define	MSIZE		256		/* size of an mbuf */
     99 
    100 #ifndef MCLSHIFT
    101 #define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
    102 					/* 2K cluster can hold Ether frame */
    103 #endif	/* MCLSHIFT */
    104 
    105 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
    106 
    107 /*
    108  * Mach-derived conversion macros
    109  */
    110 #define	m68k_round_page(x)	((((vaddr_t)(x)) + PGOFSET) & ~PGOFSET)
    111 #define	m68k_trunc_page(x)	((vaddr_t)(x) & ~PGOFSET)
    112 #define	m68k_page_offset(x)	((vaddr_t)(x) & PGOFSET)
    113 #define	m68k_btop(x)		((vaddr_t)(x) >> PGSHIFT)
    114 #define	m68k_ptob(x)		((vaddr_t)(x) << PGSHIFT)
    115 
    116 #endif	/* !_M68K_PARAM_H_ */
    117