mac68k/include/param.h

/*	$NetBSD: param.h,v 1.13 1994/10/26 08:46:35 cgd Exp $	*/

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1982, 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.
 */
/*-
 * Copyright (C) 1993	Allen K. Briggs, Chris P. Caputo,
 *			Michael L. Finch, Bradley A. Grantham, and
 *			Lawrence A. Kesteloot
 * All rights reserved.
 *
 * 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 Alice Group.
 * 4. The names of the Alice Group or any of its members may not be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE ALICE GROUP ``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 ALICE GROUP 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 $Hdr: machparam.h 1.11 89/08/14$
 *
 *	@(#)param.h	7.8 (Berkeley) 6/28/91
 */

#ifndef _MACHINE_PARAM_H_
#define _MACHINE_PARAM_H_	1

#ifndef PSL_IPL
#include "machine/psl.h"
#endif /* PSL_IPL */

/*
 * Machine dependent constants for Macintosh II-and-similar series.
 */
#define	MACHINE		"mac68k"
#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.
 */
#define ALIGNBYTES	(sizeof(int) - 1)
#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	NPTEPG		(NBPG/(sizeof (struct pte)))

#define NBSEG		(cpu040 ? 64*NBPG : 1024*NBPG)	/* bytes/segment */
#define	SEGOFSET	(NBSEG-1)			/* byte offset into segment */
#define	SEGSHIFT	(cpu040 ? 18 : 22)		/* LOG2(NBSEG) */

/* ALICE 05/24/92,19:31:42 BG -- Well, I wish we didn't have to worry */
/*  about re-locating the kernel, but I think we will probably have to. */
#define	KERNBASE	0x00000000	/* start of kernel virtual */
#define	BTOPKERNBASE	((u_long)KERNBASE >> PGSHIFT)

#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	CLSIZE		1
#define	CLSIZELOG2	0

/* 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		3  		/* pages of u-area */

/*
 * Number of pages that UPAGES eats.  This is for the wierd sparcs of
 * the world.
 */
#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 */
#define	MCLBYTES	1024
#define	MCLSHIFT	10
#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

/*
 * Size of kernel malloc arena in CLBYTES-sized logical pages
 */
#ifndef NKMEMCLUSTERS
#define	NKMEMCLUSTERS	(2048*1024/CLBYTES)
#endif

/* pages ("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)

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

/* bytes to pages */
#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 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 mac68k_round_seg(x)	((((unsigned)(x)) + NBSEG - 1) & ~(NBSEG-1))
#define mac68k_trunc_seg(x)	((unsigned)(x) & ~(NBSEG-1))
#define mac68k_round_page(x)	((((unsigned)(x)) + NBPG - 1) & ~(NBPG-1))
#define mac68k_trunc_page(x)	((unsigned)(x) & ~(NBPG-1))
#define mac68k_btos(x)		((unsigned)(x) >> SEGSHIFT)
#define mac68k_stob(x)		((unsigned)(x) << SEGSHIFT)
#define mac68k_btop(x)		((unsigned)(x) >> PGSHIFT)
#define mac68k_ptob(x)		((unsigned)(x) << PGSHIFT)

/*
 * spl functions; all but spl0 are done in-line
 */

#define _spl(s) \
({ \
        register int _spl_r; \
\
        __asm __volatile ("clrl %0; movew sr,%0; movew %1,sr" : \
                "&=d" (_spl_r) : "di" (s)); \
        _spl_r; \
})

/* spl0 requires checking for software interrupts */
#if defined(BARF_BARF_BARF)
#define spl1()  _spl(PSL_S|PSL_IPL1)
#define spl2()  _spl(PSL_S|PSL_IPL2)
#define spl3()  _spl(PSL_S|PSL_IPL3)
#define spl4()  _spl(PSL_S|PSL_IPL4)
#define spl5()  _spl(PSL_S|PSL_IPL5)
#define spl6()  _spl(PSL_S|PSL_IPL6)
#define spl7()  _spl(PSL_S|PSL_IPL7)
#else /* not BARF_BARF_BARF */
#define spl1()  _spl(PSL_S|PSL_IPL3)
#define spl2()  _spl(PSL_S|PSL_IPL3)
#define spl3()  _spl(PSL_S|PSL_IPL3)
#define spl4()  _spl(PSL_S|PSL_IPL3)
#define spl5()  _spl(PSL_S|PSL_IPL3)
#define spl6()  _spl(PSL_S|PSL_IPL3)
#define spl7()  _spl(PSL_S|PSL_IPL7)	/* spl7() always excludes everything */
#endif /* BARF_BARF_BARF */

/* ALICE 06/03/92,14:08:28 BG I guess we could put in some spl's for various */
/*  devices like VIA1 interrupt, and so on. */
/* BARF -- These should be used for:
   1) ensuring mutual exclusion (why use processor level?)
   2) allowing faster devices to take priority
 */
#define splsoftclock()  spl1()	/* disallow softclock */
#define splnet()        spl1()	/* disallow network */
#define splbio()        spl5()	/* disallow block I/O */
#define splimp()        spl5()	/* disallow imput */
#define spltty()        spl5()	/* disallow tty interrupts */
#define splclock()      spl6()	/* disallow clock interrupt */
#define splvm()         spl6()	/* disallow virtual memory operations */
#define splhigh()       spl7()	/* disallow everything */
#define splsched()      spl7()	/* disallow scheduling */

#define splstatclock()  spl7()	/* This should be splclock... */

/* watch out for side effects */
#define splx(s)         ((s) & PSL_IPL ? _spl(s) : spl0())

#endif /* _MACHINE_PARAM_H_ */