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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (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 2004 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _SYS_SYSMACROS_H
#define _SYS_SYSMACROS_H
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/param.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
#ifdef _KERNEL
/*
* 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]
#endif /* _KERNEL */
/*
* 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
#ifdef _KERNEL
/* major part of a device internal to the kernel */
#define major(x) (major_t)((((unsigned)(x)) >> O_BITSMINOR) & O_MAXMAJ)
#define bmajor(x) (major_t)((((unsigned)(x)) >> O_BITSMINOR) & O_MAXMAJ)
/* get internal major part of expanded device number */
#define getmajor(x) (major_t)((((dev_t)(x)) >> L_BITSMINOR) & L_MAXMAJ)
/* minor part of a device internal to the kernel */
#define minor(x) (minor_t)((x) & O_MAXMIN)
/* get internal minor part of expanded device number */
#define getminor(x) (minor_t)((x) & L_MAXMIN)
#else
/* major part of a device external from the kernel (same as emajor below) */
#define major(x) (major_t)((((unsigned)(x)) >> O_BITSMINOR) & O_MAXMAJ)
/* minor part of a device external from the kernel (same as eminor below) */
#define minor(x) (minor_t)((x) & O_MAXMIN)
#endif /* _KERNEL */
/* create old device number */
#define makedev(x, y) (unsigned short)(((x) << O_BITSMINOR) | ((y) & O_MAXMIN))
/* make an new device number */
#define makedevice(x, y) (dev_t)(((dev_t)(x) << L_BITSMINOR) | ((y) & L_MAXMIN))
/*
* emajor() allows kernel/driver code to print external major numbers
* eminor() allows kernel/driver code to print external minor numbers
*/
#define emajor(x) \
(major_t)(((unsigned int)(x) >> O_BITSMINOR) > O_MAXMAJ) ? \
NODEV : (((unsigned int)(x) >> O_BITSMINOR) & O_MAXMAJ)
#define eminor(x) \
(minor_t)((x) & O_MAXMIN)
/*
* get external major and minor device
* components from expanded device number
*/
#define getemajor(x) (major_t)((((dev_t)(x) >> L_BITSMINOR) > L_MAXMAJ) ? \
NODEV : (((dev_t)(x) >> L_BITSMINOR) & L_MAXMAJ))
#define geteminor(x) (minor_t)((x) & L_MAXMIN)
/*
* 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 when the alignment
* is known to be a power of 2.
*/
#define P2ALIGN(x, align) ((x) & -(align))
#define P2PHASE(x, align) ((x) & ((align) - 1))
#define P2NPHASE(x, align) (-(x) & ((align) - 1))
#define P2ROUNDUP(x, align) (-(-(x) & -(align)))
#define P2END(x, align) (-(~(x) & -(align)))
#define P2PHASEUP(x, align, phase) ((phase) - (((phase) - (x)) & -(align)))
#define P2CROSS(x, y, align) (((x) ^ (y)) > (align) - 1)
/*
* Determine whether two numbers have the same high-order bit.
*/
#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)
#if defined(_KERNEL) && !defined(_KMEMUSER) && !defined(offsetof)
/* avoid any possibility of clashing with <stddef.h> version */
#define offsetof(s, m) ((size_t)(&(((s *)0)->m)))
#endif
#ifdef __cplusplus
}
#endif
#endif /* _SYS_SYSMACROS_H */
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