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172 lines
6.8 KiB
C
172 lines
6.8 KiB
C
/*
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* Copyright (c) 2000-2010 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)param.h 8.1 (Berkeley) 4/4/95
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*/
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/*
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* Machine dependent constants for Intel 386.
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*/
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#ifndef _I386_PARAM_H_
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#define _I386_PARAM_H_
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#include <i386/_param.h>
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/*
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* Round p (pointer or byte index) up to a correctly-aligned value for all
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* data types (int, long, ...). The result is unsigned int and must be
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* cast to any desired pointer type.
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*/
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#define ALIGNBYTES __DARWIN_ALIGNBYTES
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#define ALIGN(p) __DARWIN_ALIGN(p)
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#define NBPG 4096 /* bytes/page */
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#define PGOFSET (NBPG-1) /* byte offset into page */
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#define PGSHIFT 12 /* LOG2(NBPG) */
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#define DEV_BSIZE 512
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#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
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#define BLKDEV_IOSIZE 2048
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#define MAXPHYS (128 * 1024) /* max raw I/O transfer size */
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#define CLSIZE 1
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#define CLSIZELOG2 0
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/*
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* Constants related to network buffer management.
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* MCLBYTES must be no larger than CLBYTES (the software page size), and,
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* on machines that exchange pages of input or output buffers with mbuf
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* clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
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* of the hardware page size.
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*/
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#define MSIZESHIFT 8 /* 256 */
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#define MSIZE (1 << MSIZESHIFT) /* size of an mbuf */
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#define MCLSHIFT 11 /* 2048 */
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#define MCLBYTES (1 << MCLSHIFT) /* size of an mbuf cluster */
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#define MBIGCLSHIFT 12 /* 4096 */
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#define MBIGCLBYTES (1 << MBIGCLSHIFT) /* size of a big cluster */
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#define M16KCLSHIFT 14 /* 16384 */
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#define M16KCLBYTES (1 << M16KCLSHIFT) /* size of a jumbo cluster */
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#define MCLOFSET (MCLBYTES - 1)
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#ifndef NMBCLUSTERS
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#define NMBCLUSTERS ((1024 * 1024) / MCLBYTES) /* cl map size: 1MB */
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#endif
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/*
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* Some macros for units conversion
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*/
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/* Core clicks (NeXT_page_size bytes) to segments and vice versa */
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#define ctos(x) (x)
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#define stoc(x) (x)
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/* Core clicks (4096 bytes) to disk blocks */
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#define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
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#define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
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#define dtob(x) ((x)<<DEV_BSHIFT)
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/* clicks to bytes */
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#define ctob(x) ((x)<<PGSHIFT)
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/* bytes to clicks */
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#define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT)
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#ifdef __APPLE__
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#define btodb(bytes, devBlockSize) \
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((unsigned)(bytes) / devBlockSize)
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#define dbtob(db, devBlockSize) \
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((unsigned)(db) * devBlockSize)
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#else
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#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
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((unsigned)(bytes) >> DEV_BSHIFT)
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#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
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((unsigned)(db) << DEV_BSHIFT)
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#endif
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/*
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* Map a ``block device block'' to a file system block.
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* This should be device dependent, and will be if we
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* add an entry to cdevsw/bdevsw for that purpose.
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* For now though just use DEV_BSIZE.
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*/
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#define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
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/*
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* Macros to decode (and encode) processor status word.
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*/
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#define STATUS_WORD(rpl, ipl) (((ipl) << 8) | (rpl))
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#define USERMODE(x) (((x) & 3) == 3)
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#define BASEPRI(x) (((x) & (255 << 8)) == 0)
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#if defined(KERNEL) || defined(STANDALONE)
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#define DELAY(n) delay(n)
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#else /* defined(KERNEL) || defined(STANDALONE) */
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#define DELAY(n) { int N = (n); while (--N > 0); }
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#endif /* defined(KERNEL) || defined(STANDALONE) */
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#endif /* _I386_PARAM_H_ */
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