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/* $OpenBSD: param.h,v 1.1 1997/07/06 07:46:26 downsj Exp $ */
/* $NetBSD: param.h,v 1.2 1997/06/10 18:21:23 veego Exp $ */
/*
* Copyright (c) 1988 University of Utah.
* Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: Utah $Hdr: machparam.h 1.16 92/12/20$
*
* @(#)param.h 8.1 (Berkeley) 6/10/93
*/
#ifndef _M68K_PARAM_H_
#define _M68K_PARAM_H_
/*
* Machine independent constants for m68k
*/
#define _MACHINE_ARCH m68k
#define MACHINE_ARCH "m68k"
#define MID_MACHINE MID_M68K
/*
* Round p (pointer or byte index) up to a correctly-aligned value for all
* data types (int, long, ...). The result is u_int and must be cast to
* any desired pointer type.
*
* ALIGNED_POINTER is a boolean macro that checks whether an address
* is valid to fetch data elements of type t from on this architecture.
* This does not reflect the optimal alignment, just the possibility
* (within reasonable limits).
*
*/
#define ALIGNBYTES (sizeof(int) - 1)
#define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
#define ALIGNED_POINTER(p,t) ((((u_long)(p)) & (sizeof(t)-1)) == 0)
#define NBPG (1 << PGSHIFT) /* bytes/page */
#define PGOFSET (NBPG-1) /* byte offset into page */
#define NPTEPG (NBPG/(sizeof (pt_entry_t)))
#define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT)
#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
#define DEV_BSIZE (1 << DEV_BSHIFT)
#define BLKDEV_IOSIZE 2048
#define MAXPHYS (64 * 1024) /* max raw I/O transfer size */
#define CLSIZELOG2 0
#define CLSIZE (1 << CLSIZELOG2)
/* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */
#define SSIZE 1 /* initial stack size/NBPG */
#define SINCR 1 /* increment of stack/NBPG */
/* mac68k, mvme68k and x68k 3 pages of u-area */
#ifndef UPAGES
# define UPAGES 2 /* pages of u-area */
#endif
#define USPACE (UPAGES * NBPG)
/*
* Constants related to network buffer management.
* MCLBYTES must be no larger than CLBYTES (the software page size), and,
* on machines that exchange pages of input or output buffers with mbuf
* clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
* of the hardware page size.
*/
#define MSIZE 128 /* size of an mbuf */
#ifndef MCLSHIFT
# define MCLSHIFT 11 /* convert bytes to m_buf clusters */
#endif /* MCLSHIFT */
#define MCLBYTES (1 << MCLSHIFT)
#define MCLOFSET (MCLBYTES - 1)
#ifndef NMBCLUSTERS
#ifdef GATEWAY
# define NMBCLUSTERS 512 /* map size, max cluster allocation */
#else
# define NMBCLUSTERS 256 /* map size, max cluster allocation */
#endif
#endif
/* pages ("clicks") to disk blocks */
#define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
#define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
/* pages to bytes */
#define ctob(x) ((x) << PGSHIFT)
#define btoc(x) (((x) + PGOFSET) >> PGSHIFT)
/* bytes to disk blocks */
#define btodb(x) ((x) >> DEV_BSHIFT)
#define dbtob(x) ((x) << DEV_BSHIFT)
/*
* Map a ``block device block'' to a file system block.
* This should be device dependent, and should use the bsize
* field from the disk label.
* For now though just use DEV_BSIZE.
*/
#define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
/*
* Mach derived conversion macros
*/
#define m68k_round_seg(x) ((((unsigned)(x)) + SEGOFSET) & ~SEGOFSET)
#define m68k_trunc_seg(x) ((unsigned)(x) & ~SEGOFSET)
#define m68k_round_page(x) ((((unsigned)(x)) + PGOFSET) & ~PGOFSET)
#define m68k_trunc_page(x) ((unsigned)(x) & ~PGOFSET)
#define m68k_btop(x) ((unsigned)(x) >> PGSHIFT)
#define m68k_ptob(x) ((unsigned)(x) << PGSHIFT)
#endif /* !_M68K_PARAM_H_ */
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