[unix-history] / sys / i386 / include / param.h

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * 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: @(#)param.h	5.8 (Berkeley) 6/28/91
 *	$Id: param.h,v 1.7 1993/10/15 10:07:43 rgrimes Exp $
 */

#ifndef _MACHINE_PARAM_H_
#define _MACHINE_PARAM_H_ 1

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

#define MACHINE		"i386"
#define MID_MACHINE	MID_I386

/*
 * 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	(sizeof(int) - 1)
#define ALIGN(p)	(((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)

/* XXX PGSHIFT and PG_SHIFT are two names for the same thing */
#define PGSHIFT		12		/* LOG2(NBPG) */
#define NBPG		(1 << PGSHIFT)	/* bytes/page */
#define PGOFSET		(NBPG-1)	/* byte offset into page */
#define NPTEPG		(NBPG/(sizeof (struct pte)))

/* XXX PDRSHIFT and PD_SHIFT are two names for the same thing */
#define PDRSHIFT	22		/* LOG2(NBPDR) */
#define NBPDR		(1 << PDRSHIFT)	/* bytes/page dir */
#define PDROFSET	(NBPDR-1)	/* byte offset into page dir */

/*
 * XXX This should really be KPTDPTDI << PDRSHIFT, but since KPTDPTDI is
 * defined in pmap.h which is included after this we can't do that
 * (YET!)
 */
#define KERNBASE	0xFE000000	/* start of kernel virtual */
#define BTOPKERNBASE	((u_long)KERNBASE >> PGSHIFT)

#define KERNSIZE	0x00C00000	/* size of kernel virtual */

#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 */

#define UPAGES	2		/* pages of u-area */

/*
 * 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.
 */
#ifndef	MSIZE
#define MSIZE		128		/* size of an mbuf */
#endif	/* MSIZE */

#ifndef	MCLSHIFT
#define MCLSHIFT	11		/* convert bytes to m_buf clusters */
#endif	/* MCLSHIFT */
#define MCLBYTES	(1 << MCLSHIFT)	/* size of an m_buf cluster */
#define MCLOFSET	(MCLBYTES - 1)	/* offset within an m_buf cluster */

#ifndef NMBCLUSTERS
#ifdef GATEWAY
#define NMBCLUSTERS	512		/* map size, max cluster allocation */
#else
#define NMBCLUSTERS	256		/* map size, max cluster allocation */
#endif	/* GATEWAY */
#endif	/* NMBCLUSTERS */

/*
 * Some macros for units conversion
 */
/* Core clicks (4096 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)

#define btodb(bytes)	 		/* calculates (bytes / DEV_BSIZE) */ \
	((unsigned)(bytes) >> DEV_BSHIFT)
#define dbtob(db)			/* calculates (db * DEV_BSIZE) */ \
	((unsigned)(db) << DEV_BSHIFT)

/*
 * 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))

/*
 * Mach derived conversion macros
 */
#define i386_round_pdr(x)	((((unsigned)(x)) + NBPDR - 1) & ~(NBPDR-1))
#define i386_trunc_pdr(x)	((unsigned)(x) & ~(NBPDR-1))
#define i386_round_page(x)	((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1))
#define i386_trunc_page(x)	((unsigned)(x) & ~(NBPG-1))
#define i386_btod(x)		((unsigned)(x) >> PDRSHIFT)
#define i386_dtob(x)		((unsigned)(x) << PDRSHIFT)
#define i386_btop(x)		((unsigned)(x) >> PGSHIFT)
#define i386_ptob(x)		((unsigned)(x) << PGSHIFT)

/*
 * phystokv stolen from SCSI device drivers and fixed to use KERNBASE
 */
#define PHYSTOKV(x)	(x | KERNBASE)
#endif /* _MACHINE_PARAM_H_ */
Commit	Line	Data
15637ed4 RG	1	/*-
	2	* Copyright (c) 1990 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* This code is derived from software contributed to Berkeley by
	6	* William Jolitz.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. All advertising materials mentioning features or use of this software
	17	* must display the following acknowledgement:
	18	* This product includes software developed by the University of
	19	* California, Berkeley and its contributors.
	20	* 4. 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	*
992f04f3	36	* from: @(#)param.h 5.8 (Berkeley) 6/28/91
126bd309	37	* $Id: param.h,v 1.7 1993/10/15 10:07:43 rgrimes Exp $
15637ed4 RG	38	*/
15637ed4 RG	39
126bd309 GW	40	#ifndef _MACHINE_PARAM_H_
	41	#define _MACHINE_PARAM_H_ 1
	42
15637ed4 RG	43	/*
	44	* Machine dependent constants for Intel 386.
	45	*/
	46
992f04f3 RG	47	#define MACHINE "i386"
992f04f3 RG	48	#define MID_MACHINE MID_I386
15637ed4 RG	49
	50	/*
	51	* Round p (pointer or byte index) up to a correctly-aligned value
	52	* for all data types (int, long, ...). The result is u_int and
	53	* must be cast to any desired pointer type.
	54	*/
adc437a8 NW	55	#define ALIGNBYTES (sizeof(int) - 1)
	56	#define ALIGN(p) (((u_int)(p) + ALIGNBYTES) &~ ALIGNBYTES)
	57
adc13511	58	/* XXX PGSHIFT and PG_SHIFT are two names for the same thing */
098f00a6 RG	59	#define PGSHIFT 12 /* LOG2(NBPG) */
	60	#define NBPG (1 << PGSHIFT) /* bytes/page */
	61	#define PGOFSET (NBPG-1) /* byte offset into page */
	62	#define NPTEPG (NBPG/(sizeof (struct pte)))
15637ed4	63
adc13511	64	/* XXX PDRSHIFT and PD_SHIFT are two names for the same thing */
098f00a6	65	#define PDRSHIFT 22 /* LOG2(NBPDR) */
7bd661f3	66	#define NBPDR (1 << PDRSHIFT) /* bytes/page dir */
098f00a6	67	#define PDROFSET (NBPDR-1) /* byte offset into page dir */
15637ed4	68
adc13511 RG	69	/*
	70	* XXX This should really be KPTDPTDI << PDRSHIFT, but since KPTDPTDI is
	71	* defined in pmap.h which is included after this we can't do that
	72	* (YET!)
	73	*/
098f00a6 RG	74	#define KERNBASE 0xFE000000 /* start of kernel virtual */
098f00a6 RG	75	#define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT)
15637ed4	76
098f00a6	77	#define KERNSIZE 0x00C00000 /* size of kernel virtual */
7bd661f3	78
098f00a6 RG	79	#define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
098f00a6 RG	80	#define DEV_BSIZE (1 << DEV_BSHIFT)
7bd661f3	81
15637ed4	82	#define BLKDEV_IOSIZE 2048
098f00a6	83	#define MAXPHYS (64 * 1024) /* max raw I/O transfer size */
15637ed4	84
098f00a6 RG	85	#define CLSIZELOG2 0
098f00a6 RG	86	#define CLSIZE (1 << CLSIZELOG2)
15637ed4 RG	87
15637ed4 RG	88	/* NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE */
098f00a6 RG	89	#define SSIZE 1 /* initial stack size/NBPG */
098f00a6 RG	90	#define SINCR 1 /* increment of stack/NBPG */
15637ed4	91
098f00a6	92	#define UPAGES 2 /* pages of u-area */
15637ed4 RG	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	*/
	101	#ifndef MSIZE
098f00a6	102	#define MSIZE 128 /* size of an mbuf */
15637ed4 RG	103	#endif /* MSIZE */
	104
	105	#ifndef MCLSHIFT
098f00a6	106	#define MCLSHIFT 11 /* convert bytes to m_buf clusters */
15637ed4	107	#endif /* MCLSHIFT */
098f00a6 RG	108	#define MCLBYTES (1 << MCLSHIFT) /* size of an m_buf cluster */
098f00a6 RG	109	#define MCLOFSET (MCLBYTES - 1) /* offset within an m_buf cluster */
15637ed4 RG	110
	111	#ifndef NMBCLUSTERS
	112	#ifdef GATEWAY
098f00a6	113	#define NMBCLUSTERS 512 /* map size, max cluster allocation */
15637ed4	114	#else
098f00a6	115	#define NMBCLUSTERS 256 /* map size, max cluster allocation */
15637ed4 RG	116	#endif /* GATEWAY */
	117	#endif /* NMBCLUSTERS */
	118
15637ed4 RG	119	/*
	120	* Some macros for units conversion
	121	*/
	122	/* Core clicks (4096 bytes) to segments and vice versa */
098f00a6 RG	123	#define ctos(x) (x)
098f00a6 RG	124	#define stoc(x) (x)
15637ed4 RG	125
15637ed4 RG	126	/* Core clicks (4096 bytes) to disk blocks */
098f00a6 RG	127	#define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
	128	#define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
	129	#define dtob(x) ((x)<<DEV_BSHIFT)
15637ed4 RG	130
15637ed4 RG	131	/* clicks to bytes */
098f00a6	132	#define ctob(x) ((x)<<PGSHIFT)
15637ed4 RG	133
15637ed4 RG	134	/* bytes to clicks */
098f00a6	135	#define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT)
15637ed4	136
098f00a6	137	#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
15637ed4	138	((unsigned)(bytes) >> DEV_BSHIFT)
098f00a6	139	#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
15637ed4 RG	140	((unsigned)(db) << DEV_BSHIFT)
	141
	142	/*
	143	* Map a ``block device block'' to a file system block.
	144	* This should be device dependent, and will be if we
	145	* add an entry to cdevsw/bdevsw for that purpose.
	146	* For now though just use DEV_BSIZE.
	147	*/
098f00a6	148	#define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
15637ed4 RG	149
	150	/*
	151	* Mach derived conversion macros
	152	*/
	153	#define i386_round_pdr(x) ((((unsigned)(x)) + NBPDR - 1) & ~(NBPDR-1))
	154	#define i386_trunc_pdr(x) ((unsigned)(x) & ~(NBPDR-1))
	155	#define i386_round_page(x) ((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1))
	156	#define i386_trunc_page(x) ((unsigned)(x) & ~(NBPG-1))
	157	#define i386_btod(x) ((unsigned)(x) >> PDRSHIFT)
	158	#define i386_dtob(x) ((unsigned)(x) << PDRSHIFT)
	159	#define i386_btop(x) ((unsigned)(x) >> PGSHIFT)
	160	#define i386_ptob(x) ((unsigned)(x) << PGSHIFT)
098f00a6 RG	161
	162	/*
	163	* phystokv stolen from SCSI device drivers and fixed to use KERNBASE
	164	*/
79e1cb33	165	#define PHYSTOKV(x) (x \| KERNBASE)
126bd309	166	#endif /* _MACHINE_PARAM_H_ */