zfs/include/os/freebsd/spl/sys/sysmacros.h - backupdr - Git at Google

 /*
  * CDDL HEADER START
  *
  * The contents of this file are subject to the terms of the
  * Common Development and Distribution License (the "License").
  * You may not use this file except in compliance with the License.
  *
  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  * or http://www.opensolaris.org/os/licensing.
  * See the License for the specific language governing permissions
  * and limitations under the License.
  *
  * When distributing Covered Code, include this CDDL HEADER in each
  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  * If applicable, add the following below this CDDL HEADER, with the
  * fields enclosed by brackets "[]" replaced with your own identifying
  * information: Portions Copyright [yyyy] [name of copyright owner]
  *
  * CDDL HEADER END
  */
 /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
 /*	  All Rights Reserved  	*/


 /*
  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */

 #ifndef _SYS_SYSMACROS_H
 #define	_SYS_SYSMACROS_H

 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/isa_defs.h>
 #include <sys/libkern.h>
 #include <sys/zone.h>
 #include <sys/condvar.h>

 #ifdef	__cplusplus
 extern "C" {
 #endif

 /*
  * Some macros for units conversion
  */
 /*
  * Disk blocks (sectors) and bytes.
  */
 #define	dtob(DD)	((DD) << DEV_BSHIFT)
 #define	btod(BB)	(((BB) + DEV_BSIZE - 1) >> DEV_BSHIFT)
 #define	btodt(BB)	((BB) >> DEV_BSHIFT)
 #define	lbtod(BB)	(((offset_t)(BB) + DEV_BSIZE - 1) >> DEV_BSHIFT)

 /* common macros */
 #ifndef MIN
 #define	MIN(a, b)	((a) < (b) ? (a) : (b))
 #endif
 #ifndef MAX
 #define	MAX(a, b)	((a) < (b) ? (b) : (a))
 #endif
 #ifndef ABS
 #define	ABS(a)		((a) < 0 ? -(a) : (a))
 #endif
 #ifndef	SIGNOF
 #define	SIGNOF(a)	((a) < 0 ? -1 : (a) > 0)
 #endif
 #ifndef	ARRAY_SIZE
 #define	ARRAY_SIZE(a) (sizeof (a) / sizeof (a[0]))
 #endif
 #ifndef	DIV_ROUND_UP
 #define	DIV_ROUND_UP(n, d)	(((n) + (d) - 1) / (d))
 #endif

 #ifdef _STANDALONE
 #define	boot_ncpus 1
 #else /* _STANDALONE */
 #define	boot_ncpus mp_ncpus
 #endif /* _STANDALONE */
 #define	kpreempt_disable() critical_enter()
 #define	kpreempt_enable() critical_exit()
 #define	CPU_SEQID curcpu
 #define	CPU_SEQID_UNSTABLE curcpu
 #define	is_system_labeled()		0
 /*
  * Convert a single byte to/from binary-coded decimal (BCD).
  */
 extern unsigned char byte_to_bcd[256];
 extern unsigned char bcd_to_byte[256];

 #define	BYTE_TO_BCD(x)	byte_to_bcd[(x) & 0xff]
 #define	BCD_TO_BYTE(x)	bcd_to_byte[(x) & 0xff]

 /*
  * WARNING: The device number macros defined here should not be used by device
  * drivers or user software. Device drivers should use the device functions
  * defined in the DDI/DKI interface (see also ddi.h). Application software
  * should make use of the library routines available in makedev(3). A set of
  * new device macros are provided to operate on the expanded device number
  * format supported in SVR4. Macro versions of the DDI device functions are
  * provided for use by kernel proper routines only. Macro routines bmajor(),
  * major(), minor(), emajor(), eminor(), and makedev() will be removed or
  * their definitions changed at the next major release following SVR4.
  */

 #define	O_BITSMAJOR	7	/* # of SVR3 major device bits */
 #define	O_BITSMINOR	8	/* # of SVR3 minor device bits */
 #define	O_MAXMAJ	0x7f	/* SVR3 max major value */
 #define	O_MAXMIN	0xff	/* SVR3 max minor value */


 #define	L_BITSMAJOR32	14	/* # of SVR4 major device bits */
 #define	L_BITSMINOR32	18	/* # of SVR4 minor device bits */
 #define	L_MAXMAJ32	0x3fff	/* SVR4 max major value */
 #define	L_MAXMIN32	0x3ffff	/* MAX minor for 3b2 software drivers. */
 				/* For 3b2 hardware devices the minor is */
 				/* restricted to 256 (0-255) */

 #ifdef _LP64
 #define	L_BITSMAJOR	32	/* # of major device bits in 64-bit Solaris */
 #define	L_BITSMINOR	32	/* # of minor device bits in 64-bit Solaris */
 #define	L_MAXMAJ	0xfffffffful	/* max major value */
 #define	L_MAXMIN	0xfffffffful	/* max minor value */
 #else
 #define	L_BITSMAJOR	L_BITSMAJOR32
 #define	L_BITSMINOR	L_BITSMINOR32
 #define	L_MAXMAJ	L_MAXMAJ32
 #define	L_MAXMIN	L_MAXMIN32
 #endif

 /*
  * These are versions of the kernel routines for compressing and
  * expanding long device numbers that don't return errors.
  */
 #if (L_BITSMAJOR32 == L_BITSMAJOR) && (L_BITSMINOR32 == L_BITSMINOR)

 #define	DEVCMPL(x)	(x)
 #define	DEVEXPL(x)	(x)

 #else

 #define	DEVCMPL(x)	\
 	(dev32_t)((((x) >> L_BITSMINOR) > L_MAXMAJ32 || \
 	    ((x) & L_MAXMIN) > L_MAXMIN32) ? NODEV32 : \
 	    ((((x) >> L_BITSMINOR) << L_BITSMINOR32) | ((x) & L_MAXMIN32)))

 #define	DEVEXPL(x)	\
 	(((x) == NODEV32) ? NODEV : \
 	makedevice(((x) >> L_BITSMINOR32) & L_MAXMAJ32, (x) & L_MAXMIN32))

 #endif /* L_BITSMAJOR32 ... */

 /* convert to old (SVR3.2) dev format */

 #define	cmpdev(x) \
 	(o_dev_t)((((x) >> L_BITSMINOR) > O_MAXMAJ || \
 	    ((x) & L_MAXMIN) > O_MAXMIN) ? NODEV : \
 	    ((((x) >> L_BITSMINOR) << O_BITSMINOR) | ((x) & O_MAXMIN)))

 /* convert to new (SVR4) dev format */

 #define	expdev(x) \
 	(dev_t)(((dev_t)(((x) >> O_BITSMINOR) & O_MAXMAJ) << L_BITSMINOR) | \
 	    ((x) & O_MAXMIN))

 /*
  * Macro for checking power of 2 address alignment.
  */
 #define	IS_P2ALIGNED(v, a) ((((uintptr_t)(v)) & ((uintptr_t)(a) - 1)) == 0)

 /*
  * Macros for counting and rounding.
  */
 #define	howmany(x, y)	(((x)+((y)-1))/(y))
 #define	roundup(x, y)	((((x)+((y)-1))/(y))*(y))

 /*
  * Macro to determine if value is a power of 2
  */
 #define	ISP2(x)		(((x) & ((x) - 1)) == 0)

 /*
  * Macros for various sorts of alignment and rounding.  The "align" must
  * be a power of 2.  Often times it is a block, sector, or page.
  */

 /*
  * return x rounded down to an align boundary
  * eg, P2ALIGN(1200, 1024) == 1024 (1*align)
  * eg, P2ALIGN(1024, 1024) == 1024 (1*align)
  * eg, P2ALIGN(0x1234, 0x100) == 0x1200 (0x12*align)
  * eg, P2ALIGN(0x5600, 0x100) == 0x5600 (0x56*align)
  */
 #define	P2ALIGN(x, align)		((x) & -(align))

 /*
  * return x % (mod) align
  * eg, P2PHASE(0x1234, 0x100) == 0x34 (x-0x12*align)
  * eg, P2PHASE(0x5600, 0x100) == 0x00 (x-0x56*align)
  */
 #define	P2PHASE(x, align)		((x) & ((align) - 1))

 /*
  * return how much space is left in this block (but if it's perfectly
  * aligned, return 0).
  * eg, P2NPHASE(0x1234, 0x100) == 0xcc (0x13*align-x)
  * eg, P2NPHASE(0x5600, 0x100) == 0x00 (0x56*align-x)
  */
 #define	P2NPHASE(x, align)		(-(x) & ((align) - 1))

 /*
  * return x rounded up to an align boundary
  * eg, P2ROUNDUP(0x1234, 0x100) == 0x1300 (0x13*align)
  * eg, P2ROUNDUP(0x5600, 0x100) == 0x5600 (0x56*align)
  */
 #define	P2ROUNDUP(x, align)		(-(-(x) & -(align)))

 /*
  * return the ending address of the block that x is in
  * eg, P2END(0x1234, 0x100) == 0x12ff (0x13*align - 1)
  * eg, P2END(0x5600, 0x100) == 0x56ff (0x57*align - 1)
  */
 #define	P2END(x, align)			(-(~(x) & -(align)))

 /*
  * return x rounded up to the next phase (offset) within align.
  * phase should be < align.
  * eg, P2PHASEUP(0x1234, 0x100, 0x10) == 0x1310 (0x13*align + phase)
  * eg, P2PHASEUP(0x5600, 0x100, 0x10) == 0x5610 (0x56*align + phase)
  */
 #define	P2PHASEUP(x, align, phase)	((phase) - (((phase) - (x)) & -(align)))

 /*
  * return TRUE if adding len to off would cause it to cross an align
  * boundary.
  * eg, P2BOUNDARY(0x1234, 0xe0, 0x100) == TRUE (0x1234 + 0xe0 == 0x1314)
  * eg, P2BOUNDARY(0x1234, 0x50, 0x100) == FALSE (0x1234 + 0x50 == 0x1284)
  */
 #define	P2BOUNDARY(off, len, align) \
 	(((off) ^ ((off) + (len) - 1)) > (align) - 1)

 /*
  * Return TRUE if they have the same highest bit set.
  * eg, P2SAMEHIGHBIT(0x1234, 0x1001) == TRUE (the high bit is 0x1000)
  * eg, P2SAMEHIGHBIT(0x1234, 0x3010) == FALSE (high bit of 0x3010 is 0x2000)
  */
 #define	P2SAMEHIGHBIT(x, y)		(((x) ^ (y)) < ((x) & (y)))

 /*
  * Typed version of the P2* macros.  These macros should be used to ensure
  * that the result is correctly calculated based on the data type of (x),
  * which is passed in as the last argument, regardless of the data
  * type of the alignment.  For example, if (x) is of type uint64_t,
  * and we want to round it up to a page boundary using "PAGESIZE" as
  * the alignment, we can do either
  *	P2ROUNDUP(x, (uint64_t)PAGESIZE)
  * or
  *	P2ROUNDUP_TYPED(x, PAGESIZE, uint64_t)
  */
 #define	P2ALIGN_TYPED(x, align, type)	\
 	((type)(x) & -(type)(align))
 #define	P2PHASE_TYPED(x, align, type)	\
 	((type)(x) & ((type)(align) - 1))
 #define	P2NPHASE_TYPED(x, align, type)	\
 	(-(type)(x) & ((type)(align) - 1))
 #define	P2ROUNDUP_TYPED(x, align, type)	\
 	(-(-(type)(x) & -(type)(align)))
 #define	P2END_TYPED(x, align, type)	\
 	(-(~(type)(x) & -(type)(align)))
 #define	P2PHASEUP_TYPED(x, align, phase, type)	\
 	((type)(phase) - (((type)(phase) - (type)(x)) & -(type)(align)))
 #define	P2CROSS_TYPED(x, y, align, type)	\
 	(((type)(x) ^ (type)(y)) > (type)(align) - 1)
 #define	P2SAMEHIGHBIT_TYPED(x, y, type) \
 	(((type)(x) ^ (type)(y)) < ((type)(x) & (type)(y)))

 /*
  * Macros to atomically increment/decrement a variable.  mutex and var
  * must be pointers.
  */
 #define	INCR_COUNT(var, mutex) mutex_enter(mutex), (*(var))++, mutex_exit(mutex)
 #define	DECR_COUNT(var, mutex) mutex_enter(mutex), (*(var))--, mutex_exit(mutex)

 /*
  * Macros to declare bitfields - the order in the parameter list is
  * Low to High - that is, declare bit 0 first.  We only support 8-bit bitfields
  * because if a field crosses a byte boundary it's not likely to be meaningful
  * without reassembly in its nonnative endianness.
  */
 #if defined(_BIT_FIELDS_LTOH)
 #define	DECL_BITFIELD2(_a, _b)				\
 	uint8_t _a, _b
 #define	DECL_BITFIELD3(_a, _b, _c)			\
 	uint8_t _a, _b, _c
 #define	DECL_BITFIELD4(_a, _b, _c, _d)			\
 	uint8_t _a, _b, _c, _d
 #define	DECL_BITFIELD5(_a, _b, _c, _d, _e)		\
 	uint8_t _a, _b, _c, _d, _e
 #define	DECL_BITFIELD6(_a, _b, _c, _d, _e, _f)		\
 	uint8_t _a, _b, _c, _d, _e, _f
 #define	DECL_BITFIELD7(_a, _b, _c, _d, _e, _f, _g)	\
 	uint8_t _a, _b, _c, _d, _e, _f, _g
 #define	DECL_BITFIELD8(_a, _b, _c, _d, _e, _f, _g, _h)	\
 	uint8_t _a, _b, _c, _d, _e, _f, _g, _h
 #elif defined(_BIT_FIELDS_HTOL)
 #define	DECL_BITFIELD2(_a, _b)				\
 	uint8_t _b, _a
 #define	DECL_BITFIELD3(_a, _b, _c)			\
 	uint8_t _c, _b, _a
 #define	DECL_BITFIELD4(_a, _b, _c, _d)			\
 	uint8_t _d, _c, _b, _a
 #define	DECL_BITFIELD5(_a, _b, _c, _d, _e)		\
 	uint8_t _e, _d, _c, _b, _a
 #define	DECL_BITFIELD6(_a, _b, _c, _d, _e, _f)		\
 	uint8_t _f, _e, _d, _c, _b, _a
 #define	DECL_BITFIELD7(_a, _b, _c, _d, _e, _f, _g)	\
 	uint8_t _g, _f, _e, _d, _c, _b, _a
 #define	DECL_BITFIELD8(_a, _b, _c, _d, _e, _f, _g, _h)	\
 	uint8_t _h, _g, _f, _e, _d, _c, _b, _a
 #else
 #error	One of _BIT_FIELDS_LTOH or _BIT_FIELDS_HTOL must be defined
 #endif  /* _BIT_FIELDS_LTOH */

 #if !defined(_KMEMUSER) && !defined(offsetof)

 /* avoid any possibility of clashing with <stddef.h> version */

 #define	offsetof(type, field)	__offsetof(type, field)
 #endif

 /*
  * Find highest one bit set.
  *      Returns bit number + 1 of highest bit that is set, otherwise returns 0.
  * High order bit is 31 (or 63 in _LP64 kernel).
  */
 static __inline int
 highbit(ulong_t i)
 {
 #if defined(HAVE_INLINE_FLSL)
 	return (flsl(i));
 #else
 	int h = 1;

 	if (i == 0)
 		return (0);
 #ifdef _LP64
 	if (i & 0xffffffff00000000ul) {
 		h += 32; i >>= 32;
 	}
 #endif
 	if (i & 0xffff0000) {
 		h += 16; i >>= 16;
 	}
 	if (i & 0xff00) {
 		h += 8; i >>= 8;
 	}
 	if (i & 0xf0) {
 		h += 4; i >>= 4;
 	}
 	if (i & 0xc) {
 		h += 2; i >>= 2;
 	}
 	if (i & 0x2) {
 		h += 1;
 	}
 	return (h);
 #endif
 }

 /*
  * Find highest one bit set.
  *	Returns bit number + 1 of highest bit that is set, otherwise returns 0.
  */
 static __inline int
 highbit64(uint64_t i)
 {
 #if defined(HAVE_INLINE_FLSLL)
 	return (flsll(i));
 #else
 	int h = 1;

 	if (i == 0)
 		return (0);
 	if (i & 0xffffffff00000000ULL) {
 		h += 32; i >>= 32;
 	}
 	if (i & 0xffff0000) {
 		h += 16; i >>= 16;
 	}
 	if (i & 0xff00) {
 		h += 8; i >>= 8;
 	}
 	if (i & 0xf0) {
 		h += 4; i >>= 4;
 	}
 	if (i & 0xc) {
 		h += 2; i >>= 2;
 	}
 	if (i & 0x2) {
 		h += 1;
 	}
 	return (h);
 #endif
 }

 #ifdef	__cplusplus
 }
 #endif

 #endif	/* _SYS_SYSMACROS_H */
	/*
	* CDDL HEADER START
	*
	* The contents of this file are subject to the terms of the
	* Common Development and Distribution License (the "License").
	* You may not use this file except in compliance with the License.
	*
	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	* or http://www.opensolaris.org/os/licensing.
	* See the License for the specific language governing permissions
	* and limitations under the License.
	*
	* When distributing Covered Code, include this CDDL HEADER in each
	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	* If applicable, add the following below this CDDL HEADER, with the
	* fields enclosed by brackets "[]" replaced with your own identifying
	* information: Portions Copyright [yyyy] [name of copyright owner]
	*
	* CDDL HEADER END
	*/
	/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
	/* All Rights Reserved */


	/*
	* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
	* Use is subject to license terms.
	*/

	#ifndef _SYS_SYSMACROS_H
	#define _SYS_SYSMACROS_H

	#include <sys/param.h>
	#include <sys/systm.h>
	#include <sys/isa_defs.h>
	#include <sys/libkern.h>
	#include <sys/zone.h>
	#include <sys/condvar.h>

	#ifdef __cplusplus
	extern "C" {
	#endif

	/*
	* Some macros for units conversion
	*/
	/*
	* Disk blocks (sectors) and bytes.
	*/
	#define dtob(DD) ((DD) << DEV_BSHIFT)
	#define btod(BB) (((BB) + DEV_BSIZE - 1) >> DEV_BSHIFT)
	#define btodt(BB) ((BB) >> DEV_BSHIFT)
	#define lbtod(BB) (((offset_t)(BB) + DEV_BSIZE - 1) >> DEV_BSHIFT)

	/* common macros */
	#ifndef MIN
	#define MIN(a, b) ((a) < (b) ? (a) : (b))
	#endif
	#ifndef MAX
	#define MAX(a, b) ((a) < (b) ? (b) : (a))
	#endif
	#ifndef ABS
	#define ABS(a) ((a) < 0 ? -(a) : (a))
	#endif
	#ifndef SIGNOF
	#define SIGNOF(a) ((a) < 0 ? -1 : (a) > 0)
	#endif
	#ifndef ARRAY_SIZE
	#define ARRAY_SIZE(a) (sizeof (a) / sizeof (a[0]))
	#endif
	#ifndef DIV_ROUND_UP
	#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
	#endif

	#ifdef _STANDALONE
	#define boot_ncpus 1
	#else /* _STANDALONE */
	#define boot_ncpus mp_ncpus
	#endif /* _STANDALONE */
	#define kpreempt_disable() critical_enter()
	#define kpreempt_enable() critical_exit()
	#define CPU_SEQID curcpu
	#define CPU_SEQID_UNSTABLE curcpu
	#define is_system_labeled() 0
	/*
	* Convert a single byte to/from binary-coded decimal (BCD).
	*/
	extern unsigned char byte_to_bcd[256];
	extern unsigned char bcd_to_byte[256];

	#define BYTE_TO_BCD(x) byte_to_bcd[(x) & 0xff]
	#define BCD_TO_BYTE(x) bcd_to_byte[(x) & 0xff]

	/*
	* WARNING: The device number macros defined here should not be used by device
	* drivers or user software. Device drivers should use the device functions
	* defined in the DDI/DKI interface (see also ddi.h). Application software
	* should make use of the library routines available in makedev(3). A set of
	* new device macros are provided to operate on the expanded device number
	* format supported in SVR4. Macro versions of the DDI device functions are
	* provided for use by kernel proper routines only. Macro routines bmajor(),
	* major(), minor(), emajor(), eminor(), and makedev() will be removed or
	* their definitions changed at the next major release following SVR4.
	*/

	#define O_BITSMAJOR 7 /* # of SVR3 major device bits */
	#define O_BITSMINOR 8 /* # of SVR3 minor device bits */
	#define O_MAXMAJ 0x7f /* SVR3 max major value */
	#define O_MAXMIN 0xff /* SVR3 max minor value */


	#define L_BITSMAJOR32 14 /* # of SVR4 major device bits */
	#define L_BITSMINOR32 18 /* # of SVR4 minor device bits */
	#define L_MAXMAJ32 0x3fff /* SVR4 max major value */
	#define L_MAXMIN32 0x3ffff /* MAX minor for 3b2 software drivers. */
	/* For 3b2 hardware devices the minor is */
	/* restricted to 256 (0-255) */

	#ifdef _LP64
	#define L_BITSMAJOR 32 /* # of major device bits in 64-bit Solaris */
	#define L_BITSMINOR 32 /* # of minor device bits in 64-bit Solaris */
	#define L_MAXMAJ 0xfffffffful /* max major value */
	#define L_MAXMIN 0xfffffffful /* max minor value */
	#else
	#define L_BITSMAJOR L_BITSMAJOR32
	#define L_BITSMINOR L_BITSMINOR32
	#define L_MAXMAJ L_MAXMAJ32
	#define L_MAXMIN L_MAXMIN32
	#endif

	/*
	* These are versions of the kernel routines for compressing and
	* expanding long device numbers that don't return errors.
	*/
	#if (L_BITSMAJOR32 == L_BITSMAJOR) && (L_BITSMINOR32 == L_BITSMINOR)

	#define DEVCMPL(x) (x)
	#define DEVEXPL(x) (x)

	#else

	#define DEVCMPL(x) \
	(dev32_t)((((x) >> L_BITSMINOR) > L_MAXMAJ32 \|\| \
	((x) & L_MAXMIN) > L_MAXMIN32) ? NODEV32 : \
	((((x) >> L_BITSMINOR) << L_BITSMINOR32) \| ((x) & L_MAXMIN32)))

	#define DEVEXPL(x) \
	(((x) == NODEV32) ? NODEV : \
	makedevice(((x) >> L_BITSMINOR32) & L_MAXMAJ32, (x) & L_MAXMIN32))

	#endif /* L_BITSMAJOR32 ... */

	/* convert to old (SVR3.2) dev format */

	#define cmpdev(x) \
	(o_dev_t)((((x) >> L_BITSMINOR) > O_MAXMAJ \|\| \
	((x) & L_MAXMIN) > O_MAXMIN) ? NODEV : \
	((((x) >> L_BITSMINOR) << O_BITSMINOR) \| ((x) & O_MAXMIN)))

	/* convert to new (SVR4) dev format */

	#define expdev(x) \
	(dev_t)(((dev_t)(((x) >> O_BITSMINOR) & O_MAXMAJ) << L_BITSMINOR) \| \
	((x) & O_MAXMIN))

	/*
	* Macro for checking power of 2 address alignment.
	*/
	#define IS_P2ALIGNED(v, a) ((((uintptr_t)(v)) & ((uintptr_t)(a) - 1)) == 0)

	/*
	* Macros for counting and rounding.
	*/
	#define howmany(x, y) (((x)+((y)-1))/(y))
	#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))

	/*
	* Macro to determine if value is a power of 2
	*/
	#define ISP2(x) (((x) & ((x) - 1)) == 0)

	/*
	* Macros for various sorts of alignment and rounding. The "align" must
	* be a power of 2. Often times it is a block, sector, or page.
	*/

	/*
	* return x rounded down to an align boundary
	* eg, P2ALIGN(1200, 1024) == 1024 (1*align)
	* eg, P2ALIGN(1024, 1024) == 1024 (1*align)
	* eg, P2ALIGN(0x1234, 0x100) == 0x1200 (0x12*align)
	* eg, P2ALIGN(0x5600, 0x100) == 0x5600 (0x56*align)
	*/
	#define P2ALIGN(x, align) ((x) & -(align))

	/*
	* return x % (mod) align
	* eg, P2PHASE(0x1234, 0x100) == 0x34 (x-0x12*align)
	* eg, P2PHASE(0x5600, 0x100) == 0x00 (x-0x56*align)
	*/
	#define P2PHASE(x, align) ((x) & ((align) - 1))

	/*
	* return how much space is left in this block (but if it's perfectly
	* aligned, return 0).
	* eg, P2NPHASE(0x1234, 0x100) == 0xcc (0x13*align-x)
	* eg, P2NPHASE(0x5600, 0x100) == 0x00 (0x56*align-x)
	*/
	#define P2NPHASE(x, align) (-(x) & ((align) - 1))

	/*
	* return x rounded up to an align boundary
	* eg, P2ROUNDUP(0x1234, 0x100) == 0x1300 (0x13*align)
	* eg, P2ROUNDUP(0x5600, 0x100) == 0x5600 (0x56*align)
	*/
	#define P2ROUNDUP(x, align) (-(-(x) & -(align)))

	/*
	* return the ending address of the block that x is in
	* eg, P2END(0x1234, 0x100) == 0x12ff (0x13*align - 1)
	* eg, P2END(0x5600, 0x100) == 0x56ff (0x57*align - 1)
	*/
	#define P2END(x, align) (-(~(x) & -(align)))

	/*
	* return x rounded up to the next phase (offset) within align.
	* phase should be < align.
	* eg, P2PHASEUP(0x1234, 0x100, 0x10) == 0x1310 (0x13*align + phase)
	* eg, P2PHASEUP(0x5600, 0x100, 0x10) == 0x5610 (0x56*align + phase)
	*/
	#define P2PHASEUP(x, align, phase) ((phase) - (((phase) - (x)) & -(align)))

	/*
	* return TRUE if adding len to off would cause it to cross an align
	* boundary.
	* eg, P2BOUNDARY(0x1234, 0xe0, 0x100) == TRUE (0x1234 + 0xe0 == 0x1314)
	* eg, P2BOUNDARY(0x1234, 0x50, 0x100) == FALSE (0x1234 + 0x50 == 0x1284)
	*/
	#define P2BOUNDARY(off, len, align) \
	(((off) ^ ((off) + (len) - 1)) > (align) - 1)

	/*
	* Return TRUE if they have the same highest bit set.
	* eg, P2SAMEHIGHBIT(0x1234, 0x1001) == TRUE (the high bit is 0x1000)
	* eg, P2SAMEHIGHBIT(0x1234, 0x3010) == FALSE (high bit of 0x3010 is 0x2000)
	*/
	#define P2SAMEHIGHBIT(x, y) (((x) ^ (y)) < ((x) & (y)))

	/*
	* Typed version of the P2* macros. These macros should be used to ensure
	* that the result is correctly calculated based on the data type of (x),
	* which is passed in as the last argument, regardless of the data
	* type of the alignment. For example, if (x) is of type uint64_t,
	* and we want to round it up to a page boundary using "PAGESIZE" as
	* the alignment, we can do either
	* P2ROUNDUP(x, (uint64_t)PAGESIZE)
	* or
	* P2ROUNDUP_TYPED(x, PAGESIZE, uint64_t)
	*/
	#define P2ALIGN_TYPED(x, align, type) \
	((type)(x) & -(type)(align))
	#define P2PHASE_TYPED(x, align, type) \
	((type)(x) & ((type)(align) - 1))
	#define P2NPHASE_TYPED(x, align, type) \
	(-(type)(x) & ((type)(align) - 1))
	#define P2ROUNDUP_TYPED(x, align, type) \
	(-(-(type)(x) & -(type)(align)))
	#define P2END_TYPED(x, align, type) \
	(-(~(type)(x) & -(type)(align)))
	#define P2PHASEUP_TYPED(x, align, phase, type) \
	((type)(phase) - (((type)(phase) - (type)(x)) & -(type)(align)))
	#define P2CROSS_TYPED(x, y, align, type) \
	(((type)(x) ^ (type)(y)) > (type)(align) - 1)
	#define P2SAMEHIGHBIT_TYPED(x, y, type) \
	(((type)(x) ^ (type)(y)) < ((type)(x) & (type)(y)))

	/*
	* Macros to atomically increment/decrement a variable. mutex and var
	* must be pointers.
	*/
	#define INCR_COUNT(var, mutex) mutex_enter(mutex), (*(var))++, mutex_exit(mutex)
	#define DECR_COUNT(var, mutex) mutex_enter(mutex), (*(var))--, mutex_exit(mutex)

	/*
	* Macros to declare bitfields - the order in the parameter list is
	* Low to High - that is, declare bit 0 first. We only support 8-bit bitfields
	* because if a field crosses a byte boundary it's not likely to be meaningful
	* without reassembly in its nonnative endianness.
	*/
	#if defined(_BIT_FIELDS_LTOH)
	#define DECL_BITFIELD2(_a, _b) \
	uint8_t _a, _b
	#define DECL_BITFIELD3(_a, _b, _c) \
	uint8_t _a, _b, _c
	#define DECL_BITFIELD4(_a, _b, _c, _d) \
	uint8_t _a, _b, _c, _d
	#define DECL_BITFIELD5(_a, _b, _c, _d, _e) \
	uint8_t _a, _b, _c, _d, _e
	#define DECL_BITFIELD6(_a, _b, _c, _d, _e, _f) \
	uint8_t _a, _b, _c, _d, _e, _f
	#define DECL_BITFIELD7(_a, _b, _c, _d, _e, _f, _g) \
	uint8_t _a, _b, _c, _d, _e, _f, _g
	#define DECL_BITFIELD8(_a, _b, _c, _d, _e, _f, _g, _h) \
	uint8_t _a, _b, _c, _d, _e, _f, _g, _h
	#elif defined(_BIT_FIELDS_HTOL)
	#define DECL_BITFIELD2(_a, _b) \
	uint8_t _b, _a
	#define DECL_BITFIELD3(_a, _b, _c) \
	uint8_t _c, _b, _a
	#define DECL_BITFIELD4(_a, _b, _c, _d) \
	uint8_t _d, _c, _b, _a
	#define DECL_BITFIELD5(_a, _b, _c, _d, _e) \
	uint8_t _e, _d, _c, _b, _a
	#define DECL_BITFIELD6(_a, _b, _c, _d, _e, _f) \
	uint8_t _f, _e, _d, _c, _b, _a
	#define DECL_BITFIELD7(_a, _b, _c, _d, _e, _f, _g) \
	uint8_t _g, _f, _e, _d, _c, _b, _a
	#define DECL_BITFIELD8(_a, _b, _c, _d, _e, _f, _g, _h) \
	uint8_t _h, _g, _f, _e, _d, _c, _b, _a
	#else
	#error One of _BIT_FIELDS_LTOH or _BIT_FIELDS_HTOL must be defined
	#endif /* _BIT_FIELDS_LTOH */

	#if !defined(_KMEMUSER) && !defined(offsetof)

	/* avoid any possibility of clashing with <stddef.h> version */

	#define offsetof(type, field) __offsetof(type, field)
	#endif

	/*
	* Find highest one bit set.
	* Returns bit number + 1 of highest bit that is set, otherwise returns 0.
	* High order bit is 31 (or 63 in _LP64 kernel).
	*/
	static __inline int
	highbit(ulong_t i)
	{
	#if defined(HAVE_INLINE_FLSL)
	return (flsl(i));
	#else
	int h = 1;

	if (i == 0)
	return (0);
	#ifdef _LP64
	if (i & 0xffffffff00000000ul) {
	h += 32; i >>= 32;
	}
	#endif
	if (i & 0xffff0000) {
	h += 16; i >>= 16;
	}
	if (i & 0xff00) {
	h += 8; i >>= 8;
	}
	if (i & 0xf0) {
	h += 4; i >>= 4;
	}
	if (i & 0xc) {
	h += 2; i >>= 2;
	}
	if (i & 0x2) {
	h += 1;
	}
	return (h);
	#endif
	}

	/*
	* Find highest one bit set.
	* Returns bit number + 1 of highest bit that is set, otherwise returns 0.
	*/
	static __inline int
	highbit64(uint64_t i)
	{
	#if defined(HAVE_INLINE_FLSLL)
	return (flsll(i));
	#else
	int h = 1;

	if (i == 0)
	return (0);
	if (i & 0xffffffff00000000ULL) {
	h += 32; i >>= 32;
	}
	if (i & 0xffff0000) {
	h += 16; i >>= 16;
	}
	if (i & 0xff00) {
	h += 8; i >>= 8;
	}
	if (i & 0xf0) {
	h += 4; i >>= 4;
	}
	if (i & 0xc) {
	h += 2; i >>= 2;
	}
	if (i & 0x2) {
	h += 1;
	}
	return (h);
	#endif
	}

	#ifdef __cplusplus
	}
	#endif

	#endif /* _SYS_SYSMACROS_H */