[apple/xnu.git] / bsd / i386 / param.h

/*
 * Copyright (c) 2000-2010 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*-
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * 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.
 *
 *	@(#)param.h	8.1 (Berkeley) 4/4/95
 */

/*
 * Machine dependent constants for Intel 386.
 */

#ifndef _I386_PARAM_H_
#define _I386_PARAM_H_

#include <i386/_param.h>

/*
 * Round p (pointer or byte index) up to a correctly-aligned value for all
 * data types (int, long, ...).   The result is unsigned int and must be
 * cast to any desired pointer type.
 */
#define	ALIGNBYTES	__DARWIN_ALIGNBYTES
#define	ALIGN(p)	__DARWIN_ALIGN(p)

#define	NBPG		4096		/* bytes/page */
#define	PGOFSET		(NBPG-1)	/* byte offset into page */
#define	PGSHIFT		12		/* LOG2(NBPG) */

#define	DEV_BSIZE	512
#define	DEV_BSHIFT	9		/* log2(DEV_BSIZE) */
#define BLKDEV_IOSIZE	2048
#define	MAXPHYS		(128 * 1024)	/* max raw I/O transfer size */

#define	CLSIZE		1
#define	CLSIZELOG2	0

/*
 * 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	MSIZESHIFT	8			/* 256 */
#define	MSIZE		(1 << MSIZESHIFT)	/* size of an mbuf */
#define	MCLSHIFT	11			/* 2048 */
#define	MCLBYTES	(1 << MCLSHIFT)		/* size of an mbuf cluster */
#define	MBIGCLSHIFT	12			/* 4096 */
#define	MBIGCLBYTES	(1 << MBIGCLSHIFT)	/* size of a big cluster */
#define	M16KCLSHIFT	14			/* 16384 */
#define	M16KCLBYTES	(1 << M16KCLSHIFT)	/* size of a jumbo cluster */

#define	MCLOFSET	(MCLBYTES - 1)
#ifndef NMBCLUSTERS
#define	NMBCLUSTERS	((1024 * 1024) / MCLBYTES)	/* cl map size: 1MB */
#endif

/*
 * Some macros for units conversion
 */
/* Core clicks (NeXT_page_size bytes) to segments and vice versa */
#define	ctos(x)	(x)
#define	stoc(x)	(x)

/* Core clicks (4096 bytes) to disk blocks */
#define	ctod(x)	((x)<<(PGSHIFT-DEV_BSHIFT))
#define	dtoc(x)	((x)>>(PGSHIFT-DEV_BSHIFT))
#define	dtob(x)	((x)<<DEV_BSHIFT)

/* clicks to bytes */
#define	ctob(x)	((x)<<PGSHIFT)

/* bytes to clicks */
#define	btoc(x)	(((unsigned)(x)+(NBPG-1))>>PGSHIFT)

#ifdef __APPLE__
#define  btodb(bytes, devBlockSize)         \
        ((unsigned)(bytes) / devBlockSize)
#define  dbtob(db, devBlockSize)            \
        ((unsigned)(db) * devBlockSize)
#else
#define	btodb(bytes)	 		/* calculates (bytes / DEV_BSIZE) */ \
	((unsigned)(bytes) >> DEV_BSHIFT)
#define	dbtob(db)			/* calculates (db * DEV_BSIZE) */ \
	((unsigned)(db) << DEV_BSHIFT)
#endif

/*
 * Map a ``block device block'' to a file system block.
 * This should be device dependent, and will be if we
 * add an entry to cdevsw/bdevsw for that purpose.
 * For now though just use DEV_BSIZE.
 */
#define	bdbtofsb(bn)	((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))

/*
 * Macros to decode (and encode) processor status word.
 */
#define STATUS_WORD(rpl, ipl)	(((ipl) << 8) | (rpl))
#define	USERMODE(x)		(((x) & 3) == 3)
#define	BASEPRI(x)		(((x) & (255 << 8)) == 0)


#if	defined(KERNEL) || defined(STANDALONE)
#define	DELAY(n) delay(n)

#else	/* defined(KERNEL) || defined(STANDALONE) */
#define	DELAY(n)	{ int N = (n); while (--N > 0); }
#endif	/* defined(KERNEL) || defined(STANDALONE) */

#endif /* _I386_PARAM_H_ */
Commit	Line	Data
1c79356b	1	/*
6d2010ae	2	* Copyright (c) 2000-2010 Apple Inc. All rights reserved.
5d5c5d0d	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
1c79356b	5	*
2d21ac55 A	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
8f6c56a5	14	*
2d21ac55 A	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
8f6c56a5	25	*
2d21ac55	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
1c79356b A	27	*/
	28	/*-
	29	* Copyright (c) 1990, 1993
	30	* The Regents of the University of California. All rights reserved.
	31	* (c) UNIX System Laboratories, Inc.
	32	* All or some portions of this file are derived from material licensed
	33	* to the University of California by American Telephone and Telegraph
	34	* Co. or Unix System Laboratories, Inc. and are reproduced herein with
	35	* the permission of UNIX System Laboratories, Inc.
	36	*
	37	* Redistribution and use in source and binary forms, with or without
	38	* modification, are permitted provided that the following conditions
	39	* are met:
	40	* 1. Redistributions of source code must retain the above copyright
	41	* notice, this list of conditions and the following disclaimer.
	42	* 2. Redistributions in binary form must reproduce the above copyright
	43	* notice, this list of conditions and the following disclaimer in the
	44	* documentation and/or other materials provided with the distribution.
	45	* 3. All advertising materials mentioning features or use of this software
	46	* must display the following acknowledgement:
	47	* This product includes software developed by the University of
	48	* California, Berkeley and its contributors.
	49	* 4. Neither the name of the University nor the names of its contributors
	50	* may be used to endorse or promote products derived from this software
	51	* without specific prior written permission.
	52	*
	53	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	54	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	55	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	56	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	57	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	58	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	59	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	60	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	61	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	62	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	63	* SUCH DAMAGE.
	64	*
	65	* @(#)param.h 8.1 (Berkeley) 4/4/95
	66	*/
	67
	68	/*
	69	* Machine dependent constants for Intel 386.
	70	*/
	71
	72	#ifndef _I386_PARAM_H_
	73	#define _I386_PARAM_H_
	74
2d21ac55 A	75	#include <i386/_param.h>
2d21ac55 A	76
1c79356b A	77	/*
1c79356b A	78	* Round p (pointer or byte index) up to a correctly-aligned value for all
2d21ac55	79	* data types (int, long, ...). The result is unsigned int and must be
91447636	80	* cast to any desired pointer type.
1c79356b	81	*/
2d21ac55 A	82	#define ALIGNBYTES __DARWIN_ALIGNBYTES
2d21ac55 A	83	#define ALIGN(p) __DARWIN_ALIGN(p)
1c79356b A	84
	85	#define NBPG 4096 /* bytes/page */
	86	#define PGOFSET (NBPG-1) /* byte offset into page */
	87	#define PGSHIFT 12 /* LOG2(NBPG) */
	88
	89	#define DEV_BSIZE 512
	90	#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
	91	#define BLKDEV_IOSIZE 2048
0c530ab8	92	#define MAXPHYS (128 * 1024) /* max raw I/O transfer size */
1c79356b	93
1c79356b A	94	#define CLSIZE 1
	95	#define CLSIZELOG2 0
	96
	97	/*
	98	* Constants related to network buffer management.
	99	* MCLBYTES must be no larger than CLBYTES (the software page size), and,
	100	* on machines that exchange pages of input or output buffers with mbuf
	101	* clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
	102	* of the hardware page size.
	103	*/
6d2010ae A	104	#define MSIZESHIFT 8 /* 256 */
	105	#define MSIZE (1 << MSIZESHIFT) /* size of an mbuf */
	106	#define MCLSHIFT 11 /* 2048 */
	107	#define MCLBYTES (1 << MCLSHIFT) /* size of an mbuf cluster */
	108	#define MBIGCLSHIFT 12 /* 4096 */
	109	#define MBIGCLBYTES (1 << MBIGCLSHIFT) /* size of a big cluster */
	110	#define M16KCLSHIFT 14 /* 16384 */
	111	#define M16KCLBYTES (1 << M16KCLSHIFT) /* size of a jumbo cluster */
	112
1c79356b A	113	#define MCLOFSET (MCLBYTES - 1)
1c79356b A	114	#ifndef NMBCLUSTERS
1c79356b	115	#define NMBCLUSTERS ((1024 * 1024) / MCLBYTES) /* cl map size: 1MB */
1c79356b A	116	#endif
	117
	118	/*
	119	* Some macros for units conversion
	120	*/
	121	/* Core clicks (NeXT_page_size bytes) to segments and vice versa */
	122	#define ctos(x) (x)
	123	#define stoc(x) (x)
	124
	125	/* Core clicks (4096 bytes) to disk blocks */
	126	#define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
	127	#define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
	128	#define dtob(x) ((x)<<DEV_BSHIFT)
	129
	130	/* clicks to bytes */
	131	#define ctob(x) ((x)<<PGSHIFT)
	132
	133	/* bytes to clicks */
	134	#define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT)
	135
	136	#ifdef __APPLE__
	137	#define btodb(bytes, devBlockSize) \
	138	((unsigned)(bytes) / devBlockSize)
	139	#define dbtob(db, devBlockSize) \
	140	((unsigned)(db) * devBlockSize)
	141	#else
	142	#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
	143	((unsigned)(bytes) >> DEV_BSHIFT)
	144	#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
	145	((unsigned)(db) << DEV_BSHIFT)
	146	#endif
	147
	148	/*
	149	* Map a ``block device block'' to a file system block.
	150	* This should be device dependent, and will be if we
	151	* add an entry to cdevsw/bdevsw for that purpose.
	152	* For now though just use DEV_BSIZE.
	153	*/
	154	#define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
	155
	156	/*
	157	* Macros to decode (and encode) processor status word.
	158	*/
	159	#define STATUS_WORD(rpl, ipl) (((ipl) << 8) \| (rpl))
	160	#define USERMODE(x) (((x) & 3) == 3)
	161	#define BASEPRI(x) (((x) & (255 << 8)) == 0)
	162
	163
	164	#if defined(KERNEL) \|\| defined(STANDALONE)
	165	#define DELAY(n) delay(n)
	166
	167	#else /* defined(KERNEL) \|\| defined(STANDALONE) */
39037602	168	#define DELAY(n) { int N = (n); while (--N > 0); }
1c79356b A	169	#endif /* defined(KERNEL) \|\| defined(STANDALONE) */
	170
	171	#endif /* _I386_PARAM_H_ */