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- remove unused bdbtofsb. 

- move the following macros from MD headers to sys/param.h.
	ctod
	dtoc
	ctob
	btoc
	dbtob
	btodb
This commit is contained in:
yamt 2006-08-28 13:43:35 +00:00
parent 7ecca3ca2e
commit e527ebac6f
18 changed files with 30 additions and 329 deletions
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22
sys/arch/alpha/include/param.h
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@ -1,4 +1,4 @@
/* $NetBSD: param.h,v 1.35 2005/12/11 12:16:16 christos Exp $ */
/* $NetBSD: param.h,v 1.36 2006/08/28 13:43:35 yamt Exp $ */
/*
* Copyright (c) 1992, 1993
@ -161,26 +161,6 @@
#define NKMEMPAGES_MIN_DEFAULT ((8 * 1024 * 1024) >> PAGE_SHIFT)
#define NKMEMPAGES_MAX_DEFAULT ((128 * 1024 * 1024) >> PAGE_SHIFT)
/* pages ("clicks") to disk blocks */
#define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
#define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
/* pages to bytes */
#define ctob(x) ((x) << PGSHIFT)
#define btoc(x) (((x) + PGOFSET) >> PGSHIFT)
/* bytes to disk blocks */
#define btodb(x) ((x) >> DEV_BSHIFT)
#define dbtob(x) ((x) << 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
*/

22
sys/arch/amd64/include/param.h
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@ -1,4 +1,4 @@
/* $NetBSD: param.h,v 1.2 2006/02/12 01:12:48 chs Exp $ */
/* $NetBSD: param.h,v 1.3 2006/08/28 13:43:35 yamt Exp $ */
#ifdef _KERNEL
#ifdef _LOCORE
@ -109,26 +109,6 @@
#define NKMEMPAGES_MIN_DEFAULT ((8 * 1024 * 1024) >> PAGE_SHIFT)
#define NKMEMPAGES_MAX_DEFAULT ((1 *1024 * 1024 * 1024) >> PAGE_SHIFT)
/* pages ("clicks") to disk blocks */
#define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
#define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
/* bytes to pages */
#define ctob(x) ((x) << PGSHIFT)
#define btoc(x) (((x) + PGOFSET) >> PGSHIFT)
/* bytes to disk blocks */
#define dbtob(x) ((x) << DEV_BSHIFT)
#define btodb(x) ((x) >> 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))
/*
* XXXfvdl the PD* stuff is different from i386.
*/

19
sys/arch/amigappc/include/param.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: param.h,v 1.9 2005/12/11 12:16:37 christos Exp $ */
/* $NetBSD: param.h,v 1.10 2006/08/28 13:43:35 yamt Exp $ */
/*
* Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
@ -145,23 +145,6 @@
#define NKMEMPAGES_MIN_DEFAULT ((128 * 1024 * 1024) >> PAGE_SHIFT)
#define NKMEMPAGES_MAX_DEFAULT ((128 * 1024 * 1024) >> PAGE_SHIFT)
/*
* pages ("clicks") to disk blocks
*/
#define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
#define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
/*
* bytes to pages
*/
#define ctob(x) ((x) << PGSHIFT)
#define btoc(x) (((x) + PGOFSET) >> PGSHIFT)
/*
* bytes to disk blocks
*/
#define dbtob(x) ((x) << DEV_BSHIFT)
#define btodb(x) ((x) >> DEV_BSHIFT)
/*
* Some system constants
*/

25
sys/arch/arm/include/param.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: param.h,v 1.10 2005/12/11 12:16:47 christos Exp $ */
/* $NetBSD: param.h,v 1.11 2006/08/28 13:43:35 yamt Exp $ */
/*
* Copyright (c) 1994,1995 Mark Brinicombe.
@ -105,29 +105,6 @@
#define MAXPHYS 65536 /* max I/O transfer size */
#endif
/* pages ("clicks") to disk blocks */
#define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
#define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
/*#define dtob(x) ((x) << DEV_BSHIFT)*/
#define ctob(x) ((x) << PGSHIFT)
/* bytes to pages */
#define btoc(x) (((x) + PGOFSET) >> PGSHIFT)
#define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
((bytes) >> DEV_BSHIFT)
#define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
((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))
/*
* Constants related to network buffer management.
* MCLBYTES must be no larger than NBPG (the software page size), and,

21
sys/arch/hppa/include/param.h
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@ -1,4 +1,4 @@
/* $NetBSD: param.h,v 1.7 2005/12/11 12:17:37 christos Exp $ */
/* $NetBSD: param.h,v 1.8 2006/08/28 13:43:35 yamt Exp $ */
/* $OpenBSD: param.h,v 1.12 2001/07/06 02:07:41 provos Exp $ */
@ -99,25 +99,6 @@
#define NKMEMPAGES_MIN_DEFAULT ((16 * 1024 * 1024) >> PAGE_SHIFT)
#define NKMEMPAGES_MAX_DEFAULT ((16 * 1024 * 1024) >> PAGE_SHIFT)
/* pages ("clicks") (4096 bytes) to disk blocks */
#define ctod(x) ((x)<<(PGSHIFT-DEV_BSHIFT))
#define dtoc(x) ((x)>>(PGSHIFT-DEV_BSHIFT))
/* pages to bytes */
#define ctob(x) ((x)<<PGSHIFT)
#define btoc(x) (((unsigned)(x)+(NBPG-1))>>PGSHIFT)
#define btodb(bytes) ((unsigned)(bytes) >> DEV_BSHIFT)
#define dbtob(db) ((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
*/

22
sys/arch/i386/include/param.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: param.h,v 1.60 2006/06/04 15:41:53 perry Exp $ */
/* $NetBSD: param.h,v 1.61 2006/08/28 13:43:35 yamt Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
@ -159,26 +159,6 @@
#define NKMEMPAGES_MIN_DEFAULT ((8 * 1024 * 1024) >> PAGE_SHIFT)
#define NKMEMPAGES_MAX_DEFAULT ((128 * 1024 * 1024) >> PAGE_SHIFT)
/* pages ("clicks") to disk blocks */
#define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
#define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
/* bytes to pages */
#define ctob(x) ((x) << PGSHIFT)
#define btoc(x) (((x) + PGOFSET) >> PGSHIFT)
/* bytes to disk blocks */
#define dbtob(x) ((x) << DEV_BSHIFT)
#define btodb(x) ((x) >> 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
*/

14
sys/arch/ia64/include/param.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: param.h,v 1.1 2006/04/07 14:21:18 cherry Exp $ */
/* $NetBSD: param.h,v 1.2 2006/08/28 13:43:35 yamt Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
@ -131,18 +131,6 @@
#define NKMEMPAGES_MIN_DEFAULT ((12 * 1024 * 1024) >> PAGE_SHIFT)
#define NKMEMPAGES_MAX_DEFAULT ((128 * 1024 * 1024) >> PAGE_SHIFT)
/* pages ("clicks") to disk blocks */
#define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
#define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
/* pages to bytes */
#define ctob(x) ((x) << PGSHIFT)
#define btoc(x) (((x) + PGOFSET) >> PGSHIFT)
/* bytes to disk blocks */
#define btodb(x) ((x) >> DEV_BSHIFT)
#define dbtob(x) ((x) << DEV_BSHIFT)
/*
* Mach derived conversion macros
*/

22
sys/arch/m68k/include/param.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: param.h,v 1.14 2005/12/11 12:17:53 christos Exp $ */
/* $NetBSD: param.h,v 1.15 2006/08/28 13:43:35 yamt Exp $ */
/*
* Copyright (c) 1982, 1986, 1990 The Regents of the University of California.
@ -153,26 +153,6 @@
#endif
#endif
/* pages ("clicks") to disk blocks */
#define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
#define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
/* pages to bytes */
#define ctob(x) ((x) << PGSHIFT)
#define btoc(x) (((x) + PGOFSET) >> PGSHIFT)
/* bytes to disk blocks */
#define btodb(x) ((x) >> DEV_BSHIFT)
#define dbtob(x) ((x) << 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
*/

22
sys/arch/mips/include/mips_param.h
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@ -1,4 +1,4 @@
/* $NetBSD: mips_param.h,v 1.22 2006/08/26 20:04:59 matt Exp $ */
/* $NetBSD: mips_param.h,v 1.23 2006/08/28 13:43:35 yamt Exp $ */
#ifdef _KERNEL
#include <machine/cpu.h>
@ -50,26 +50,6 @@
#define NKMEMPAGES_MIN_DEFAULT ((8 * 1024 * 1024) >> PAGE_SHIFT)
#define NKMEMPAGES_MAX_DEFAULT ((128 * 1024 * 1024) >> PAGE_SHIFT)
/* pages ("clicks") (4096 bytes) to disk blocks */
#define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
#define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
/* pages to bytes */
#define ctob(x) ((x) << PGSHIFT)
#define btoc(x) (((x) + PGOFSET) >> PGSHIFT)
/* bytes to disk blocks */
#define btodb(x) ((x) >> DEV_BSHIFT)
#define dbtob(x) ((x) << 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
*/

22
sys/arch/pc532/include/param.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: param.h,v 1.33 2006/05/12 06:05:23 simonb Exp $ */
/* $NetBSD: param.h,v 1.34 2006/08/28 13:43:35 yamt Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
@ -130,26 +130,6 @@
* Some macros for units conversion
*/
/* pages ("clicks") to disk blocks */
#define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
#define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
/* clicks to bytes */
#define ctob(x) ((x) << PGSHIFT)
#define btoc(x) (((x) + PGOFSET) >> PGSHIFT)
/* bytes to disk blocks */
#define btodb(x) ((x) >> DEV_BSHIFT)
#define dbtob(x) ((x) << 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
*/

22
sys/arch/pdp10/include/param.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: param.h,v 1.3 2005/12/11 12:18:34 christos Exp $ */
/* $NetBSD: param.h,v 1.4 2006/08/28 13:43:35 yamt Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
@ -136,28 +136,8 @@
* Some macros for units conversion
*/
/* pages ("clicks") to disk blocks */
#define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
#define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
/* clicks to bytes */
#define ctob(x) ((x) << PGSHIFT)
#define btoc(x) (((unsigned)(x) + PGOFSET) >> PGSHIFT)
#define btop(x) (((unsigned)(x)) >> PGSHIFT)
/* bytes to disk blocks */
#define btodb(x) ((unsigned long)(x) >> DEV_BSHIFT)
#define dbtob(x) ((unsigned long)(x) << 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))
#ifdef _KERNEL
#include <machine/intr.h>

19
sys/arch/powerpc/include/param.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: param.h,v 1.19 2005/12/11 12:18:43 christos Exp $ */
/* $NetBSD: param.h,v 1.20 2006/08/28 13:43:35 yamt Exp $ */
/*-
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
@ -122,21 +122,4 @@
#define NKMEMPAGES_MAX_DEFAULT ((128 * 1024 * 1024) >> PAGE_SHIFT)
#endif
/*
* pages ("clicks") to disk blocks
*/
#define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
#define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
/*
* bytes to pages
*/
#define ctob(x) ((x) << PGSHIFT)
#define btoc(x) (((x) + PGOFSET) >> PGSHIFT)
/*
* bytes to disk blocks
*/
#define dbtob(x) ((x) << DEV_BSHIFT)
#define btodb(x) ((x) >> DEV_BSHIFT)
#endif /* _POWERPC_PARAM_H_ */

13
sys/arch/sh3/include/param.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: param.h,v 1.14 2005/12/11 12:18:58 christos Exp $ */
/* $NetBSD: param.h,v 1.15 2006/08/28 13:43:35 yamt Exp $ */
/*-
* Copyright (c) 2002 The NetBSD Foundation, Inc. All rights reserved.
@ -123,15 +123,4 @@
#define NKMEMPAGES_MIN_DEFAULT ((6 * 1024 * 1024) >> PAGE_SHIFT)
#define NKMEMPAGES_MAX_DEFAULT ((6 * 1024 * 1024) >> PAGE_SHIFT)
/* pages ("clicks") to disk blocks */
#define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
#define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
/* bytes to pages */
#define ctob(x) ((x) << PGSHIFT)
#define btoc(x) (((x) + PGOFSET) >> PGSHIFT)
/* bytes to disk blocks */
#define dbtob(x) ((x) << DEV_BSHIFT)
#define btodb(x) ((x) >> DEV_BSHIFT)
#endif /* !_SH3_PARAM_H_ */

14
sys/arch/sh5/include/param.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: param.h,v 1.6 2005/12/11 12:19:00 christos Exp $ */
/* $NetBSD: param.h,v 1.7 2006/08/28 13:43:35 yamt Exp $ */
/*-
* Copyright (c) 2002 The NetBSD Foundation, Inc. All rights reserved.
@ -127,16 +127,4 @@
#define NKMEMPAGES_MIN_DEFAULT ((6 * 1024 * 1024) >> PAGE_SHIFT)
#define NKMEMPAGES_MAX_DEFAULT ((6 * 1024 * 1024) >> PAGE_SHIFT)
/* pages ("clicks") to disk blocks */
#define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
#define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
/* bytes to pages */
#define ctob(x) ((x) << PGSHIFT)
#define btoc(x) (((x) + PGOFSET) >> PGSHIFT)
/* bytes to disk blocks */
#define dbtob(x) ((x) << DEV_BSHIFT)
#define btodb(x) ((x) >> DEV_BSHIFT)
#endif /* _SH5_PARAM_H_ */

22
sys/arch/sparc/include/param.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: param.h,v 1.65 2006/03/04 03:39:02 uwe Exp $ */
/* $NetBSD: param.h,v 1.66 2006/08/28 13:43:35 yamt Exp $ */
/*
* Copyright (c) 1992, 1993
@ -144,26 +144,6 @@ extern int nbpg, pgofset, pgshift;
#define NKMEMPAGES_MIN_DEFAULT ((6 * 1024 * 1024) >> PAGE_SHIFT)
#define NKMEMPAGES_MAX_DEFAULT ((32 * 1024 * 1024) >> PAGE_SHIFT)
/* pages ("clicks") to disk blocks */
#define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
#define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
/* pages to bytes */
#define ctob(x) ((x) << PGSHIFT)
#define btoc(x) (((x) + PGOFSET) >> PGSHIFT)
/* bytes to disk blocks */
#define btodb(x) ((x) >> DEV_BSHIFT)
#define dbtob(x) ((x) << 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))
#if defined(_KERNEL) || defined(_STANDALONE)
#ifndef _LOCORE
extern void delay(unsigned int);

22
sys/arch/sparc64/include/param.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: param.h,v 1.35 2006/02/20 19:00:27 cdi Exp $ */
/* $NetBSD: param.h,v 1.36 2006/08/28 13:43:35 yamt Exp $ */
/*
* Copyright (c) 1992, 1993
@ -227,26 +227,6 @@ extern int nbpg, pgofset, pgshift;
#define NKMEMPAGES_MIN_DEFAULT ((6 * 1024 * 1024) >> PAGE_SHIFT)
#define NKMEMPAGES_MAX_DEFAULT ((128 * 1024 * 1024) >> PAGE_SHIFT)
/* pages ("clicks") to disk blocks */
#define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
#define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
/* pages to bytes */
#define ctob(x) ((x) << PGSHIFT)
#define btoc(x) (((vsize_t)(x) + PGOFSET) >> PGSHIFT)
/* bytes to disk blocks */
#define btodb(x) ((x) >> DEV_BSHIFT)
#define dbtob(x) ((x) << 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))
#ifdef _KERNEL
#ifndef _LOCORE

22
sys/arch/vax/include/param.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: param.h,v 1.53 2005/12/11 12:19:34 christos Exp $ */
/* $NetBSD: param.h,v 1.54 2006/08/28 13:43:36 yamt Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
@ -135,32 +135,12 @@
* Some macros for units conversion
*/
/* pages ("clicks") to disk blocks */
#define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
#define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
/* clicks to bytes */
#define ctob(x) ((x) << PGSHIFT)
#define btoc(x) (((x) + PGOFSET) >> PGSHIFT)
#define btop(x) ((x) >> PGSHIFT)
/* bytes to disk blocks */
#define btodb(x) ((x) >> DEV_BSHIFT)
#define dbtob(x) ((x) << DEV_BSHIFT)
/* MD conversion macros */
#define vax_btoc(x) (((unsigned)(x) + VAX_PGOFSET) >> VAX_PGSHIFT)
#define vax_btop(x) (((unsigned)(x)) >> VAX_PGSHIFT)
/*
* 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))
#ifdef _KERNEL
#include <machine/intr.h>

14
sys/sys/param.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: param.h,v 1.237 2006/08/08 05:43:00 riz Exp $ */
/* $NetBSD: param.h,v 1.238 2006/08/28 13:43:36 yamt Exp $ */
/*-
* Copyright (c) 1982, 1986, 1989, 1993
@ -145,6 +145,18 @@
#include <machine/param.h>
#include <machine/limits.h>
/* pages ("clicks") to disk blocks */
#define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT))
#define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT))
/* bytes to pages */
#define ctob(x) ((x) << PGSHIFT)
#define btoc(x) (((x) + PGOFSET) >> PGSHIFT)
/* bytes to disk blocks */
#define dbtob(x) ((x) << DEV_BSHIFT)
#define btodb(x) ((x) >> DEV_BSHIFT)
/*
* Stack macros. On most architectures, the stack grows down,
* towards lower addresses; it is the rare architecture where