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param.h revision 1.17.4.1 
      1 /*	$NetBSD: param.h,v 1.17.4.1 2011/06/06 09:05:57 jruoho 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 #ifndef _KERNEL
     55 #undef MACHINE
     56 #define MACHINE "m68k"
     57 #endif
     58 
     59 /*
     60  * Round p (pointer or byte index) up to a correctly-aligned value for all
     61  * data types (int, long, ...).   The result is u_int and must be cast to
     62  * any desired pointer type.
     63  *
     64  * ALIGNED_POINTER is a boolean macro that checks whether an address
     65  * is valid to fetch data elements of type t from on this architecture.
     66  * This does not reflect the optimal alignment, just the possibility
     67  * (within reasonable limits).
     68  *
     69  */
     70 #define ALIGNBYTES		(sizeof(int) - 1)
     71 #define	ALIGN(p)		(((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
     72 #define ALIGNED_POINTER(p,t)	((((u_long)(p)) & (sizeof(t)-1)) == 0)
     73 
     74 #define	NBPG		(1 << PGSHIFT)	/* bytes/page */
     75 #define	PGOFSET		(NBPG-1)	/* byte offset into page */
     76 
     77 #define	BTOPKERNBASE	((u_long)KERNBASE >> PGSHIFT)
     78 
     79 #define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
     80 #define	DEV_BSIZE	(1 << DEV_BSHIFT)
     81 #define BLKDEV_IOSIZE	2048
     82 #ifndef MAXPHYS
     83 #define	MAXPHYS		(64 * 1024)	/* max raw I/O transfer size */
     84 #endif
     85 
     86 #define	SSIZE		1		/* initial stack size/NBPG */
     87 #define	SINCR		1		/* increment of stack/NBPG */
     88 
     89 #define	USPACE		(UPAGES * NBPG)
     90 
     91 #ifndef MSGBUFSIZE
     92 #define MSGBUFSIZE	NBPG		/* default message buffer size */
     93 #endif
     94 
     95 /*
     96  * Constants related to network buffer management.
     97  * MCLBYTES must be no larger than NBPG (the software page size), and,
     98  * on machines that exchange pages of input or output buffers with mbuf
     99  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
    100  * of the hardware page size.
    101  */
    102 #define	MSIZE		256		/* size of an mbuf */
    103 
    104 #ifndef MCLSHIFT
    105 #define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
    106 					/* 2K cluster can hold Ether frame */
    107 #endif	/* MCLSHIFT */
    108 
    109 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
    110 
    111 /*
    112  * Mach-derived conversion macros
    113  */
    114 #define	m68k_round_page(x)	((((vaddr_t)(x)) + PGOFSET) & ~PGOFSET)
    115 #define	m68k_trunc_page(x)	((vaddr_t)(x) & ~PGOFSET)
    116 #define	m68k_page_offset(x)	((vaddr_t)(x) & PGOFSET)
    117 #define	m68k_btop(x)		((vaddr_t)(x) >> PGSHIFT)
    118 #define	m68k_ptob(x)		((vaddr_t)(x) << PGSHIFT)
    119 
    120 #endif	/* !_M68K_PARAM_H_ */
    121