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

/*
 * Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * 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. 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_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_

/*
 * 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.
 */
#define	ALIGNBYTES	3
#define	ALIGN(p)	(((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)

#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		(64 * 1024)	/* max raw I/O transfer size */

#define	STACK_GROWS_UP	0		/* stack grows to lower addresses */

#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	MSIZE		256		/* size of an mbuf */
#define	MCLBYTES	2048		/* large enough for ether MTU */
#define	MCLSHIFT	11
#define	MCLOFSET	(MCLBYTES - 1)
#ifndef NMBCLUSTERS
#ifdef GATEWAY
#define	NMBCLUSTERS	((1024 * 1024) / MCLBYTES)	/* cl map size: 1MB */
#else
#define	NMBCLUSTERS	((1024 * 512) / MCLBYTES)	/* cl map size: 0.5MB */
#endif
#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)	{ register int N = (n); while (--N > 0); }
#endif	/* defined(KERNEL) || defined(STANDALONE) */

#endif /* _I386_PARAM_H_ */
Commit	Line	Data
1c79356b	1	/*
9bccf70c	2	* Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
1c79356b A	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
43866e37	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
1c79356b	7	*
43866e37 A	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
43866e37 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
1c79356b A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/*-
	26	* Copyright (c) 1990, 1993
	27	* The Regents of the University of California. All rights reserved.
	28	* (c) UNIX System Laboratories, Inc.
	29	* All or some portions of this file are derived from material licensed
	30	* to the University of California by American Telephone and Telegraph
	31	* Co. or Unix System Laboratories, Inc. and are reproduced herein with
	32	* the permission of UNIX System Laboratories, Inc.
	33	*
	34	* Redistribution and use in source and binary forms, with or without
	35	* modification, are permitted provided that the following conditions
	36	* are met:
	37	* 1. Redistributions of source code must retain the above copyright
	38	* notice, this list of conditions and the following disclaimer.
	39	* 2. Redistributions in binary form must reproduce the above copyright
	40	* notice, this list of conditions and the following disclaimer in the
	41	* documentation and/or other materials provided with the distribution.
	42	* 3. All advertising materials mentioning features or use of this software
	43	* must display the following acknowledgement:
	44	* This product includes software developed by the University of
	45	* California, Berkeley and its contributors.
	46	* 4. Neither the name of the University nor the names of its contributors
	47	* may be used to endorse or promote products derived from this software
	48	* without specific prior written permission.
	49	*
	50	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	51	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	52	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	53	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	54	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	55	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	56	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	57	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	58	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	59	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	60	* SUCH DAMAGE.
	61	*
	62	* @(#)param.h 8.1 (Berkeley) 4/4/95
	63	*/
	64
	65	/*
	66	* Machine dependent constants for Intel 386.
	67	*/
	68
	69	#ifndef _I386_PARAM_H_
	70	#define _I386_PARAM_H_
	71
	72	/*
	73	* Round p (pointer or byte index) up to a correctly-aligned value for all
	74	* data types (int, long, ...). The result is u_int and must be cast to
	75	* any desired pointer type.
	76	*/
	77	#define ALIGNBYTES 3
	78	#define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
	79
	80	#define NBPG 4096 /* bytes/page */
	81	#define PGOFSET (NBPG-1) /* byte offset into page */
	82	#define PGSHIFT 12 /* LOG2(NBPG) */
	83
	84	#define DEV_BSIZE 512
	85	#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
86	#define BLKDEV_IOSIZE 2048
87	#define MAXPHYS (64 * 1024) /* max raw I/O transfer size */
88
89	#define STACK_GROWS_UP 0 /* stack grows to lower addresses */
90
91	#define CLSIZE 1
92	#define CLSIZELOG2 0
93
94	/*
95	* Constants related to network buffer management.
96	* MCLBYTES must be no larger than CLBYTES (the software page size), and,
97	* on machines that exchange pages of input or output buffers with mbuf
98	* clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
99	* of the hardware page size.
100	*/
0b4e3aa0	101	#define MSIZE 256 /* size of an mbuf */
1c79356b A	102	#define MCLBYTES 2048 /* large enough for ether MTU */
	103	#define MCLSHIFT 11
	104	#define MCLOFSET (MCLBYTES - 1)
	105	#ifndef NMBCLUSTERS
	106	#ifdef GATEWAY
	107	#define NMBCLUSTERS ((1024 * 1024) / MCLBYTES) /* cl map size: 1MB */
	108	#else
	109	#define NMBCLUSTERS ((1024 * 512) / MCLBYTES) /* cl map size: 0.5MB */
	110	#endif
	111	#endif
	112
	113	/*
	114	* Some macros for units conversion
	115	*/
	116	/* Core clicks (NeXT_page_size bytes) to segments and vice versa */
	117	#define ctos(x) (x)
	118	#define stoc(x) (x)
	119
	120	/* Core clicks (4096 bytes) to disk blocks */
	121	#define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
	122	#define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
	123	#define dtob(x) ((x)<<DEV_BSHIFT)
	124
	125	/* clicks to bytes */
	126	#define ctob(x) ((x)<<PGSHIFT)
	127
	128	/* bytes to clicks */
	129	#define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT)
	130
	131	#ifdef __APPLE__
	132	#define btodb(bytes, devBlockSize) \
	133	((unsigned)(bytes) / devBlockSize)
	134	#define dbtob(db, devBlockSize) \
	135	((unsigned)(db) * devBlockSize)
	136	#else
	137	#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
	138	((unsigned)(bytes) >> DEV_BSHIFT)
	139	#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
	140	((unsigned)(db) << DEV_BSHIFT)
	141	#endif
	142
	143	/*
	144	* Map a ``block device block'' to a file system block.
	145	* This should be device dependent, and will be if we
	146	* add an entry to cdevsw/bdevsw for that purpose.
	147	* For now though just use DEV_BSIZE.
	148	*/
	149	#define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
	150
	151	/*
	152	* Macros to decode (and encode) processor status word.
	153	*/
	154	#define STATUS_WORD(rpl, ipl) (((ipl) << 8) \| (rpl))
	155	#define USERMODE(x) (((x) & 3) == 3)
	156	#define BASEPRI(x) (((x) & (255 << 8)) == 0)
	157
	158
	159	#if defined(KERNEL) \|\| defined(STANDALONE)
	160	#define DELAY(n) delay(n)
	161
	162	#else /* defined(KERNEL) \|\| defined(STANDALONE) */
	163	#define DELAY(n) { register int N = (n); while (--N > 0); }
	164	#endif /* defined(KERNEL) \|\| defined(STANDALONE) */
	165
166	#endif /* _I386_PARAM_H_ */