lib/libspl/include/sys/sysmacros.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #ifndef _LIBSPL_SYS_SYSMACROS_H
  28 #define _LIBSPL_SYS_SYSMACROS_H
  29
  30 #include_next <sys/sysmacros.h>
  31
  32 /* common macros */
  33 #ifndef MIN
  34 #define MIN(a, b)       ((a) < (b) ? (a) : (b))
  35 #endif
  36 #ifndef MAX
  37 #define MAX(a, b)       ((a) < (b) ? (b) : (a))
  38 #endif
  39 #ifndef ABS
  40 #define ABS(a)          ((a) < 0 ? -(a) : (a))
  41 #endif
  42
  43 #define makedevice(maj, min)    makedev(maj, min)
  44 #define _sysconf(a)             sysconf(a)
  45 #define __NORETURN              __attribute__((noreturn))
  46
  47 /*
  48  * Compatibility macros/typedefs needed for Solaris -> Linux port
  49  */
  50 #define P2ALIGN(x, align)       ((x) & -(align))
  51 #define P2CROSS(x, y, align)    (((x) ^ (y)) > (align) - 1)
  52 #define P2ROUNDUP(x, align)     ((((x) - 1) | ((align) - 1)) + 1)
  53 #define P2BOUNDARY(off, len, align) \
  54                                 (((off) ^ ((off) + (len) - 1)) > (align) - 1)
  55 #define P2PHASE(x, align)       ((x) & ((align) - 1))
  56 #define P2NPHASE(x, align)      (-(x) & ((align) - 1))
  57 #define P2NPHASE_TYPED(x, align, type) \
  58                                 (-(type)(x) & ((type)(align) - 1))
  59 #define ISP2(x)                 (((x) & ((x) - 1)) == 0)
  60 #define IS_P2ALIGNED(v, a)      ((((uintptr_t)(v)) & ((uintptr_t)(a) - 1)) == 0)
  61
  62 /*
  63  * Typed version of the P2* macros.  These macros should be used to ensure
  64  * that the result is correctly calculated based on the data type of (x),
  65  * which is passed in as the last argument, regardless of the data
  66  * type of the alignment.  For example, if (x) is of type uint64_t,
  67  * and we want to round it up to a page boundary using "PAGESIZE" as
  68  * the alignment, we can do either
  69  *      P2ROUNDUP(x, (uint64_t)PAGESIZE)
  70  * or
  71  *      P2ROUNDUP_TYPED(x, PAGESIZE, uint64_t)
  72  */
  73 #define P2ALIGN_TYPED(x, align, type)           \
  74         ((type)(x) & -(type)(align))
  75 #define P2PHASE_TYPED(x, align, type)           \
  76         ((type)(x) & ((type)(align) - 1))
  77 #define P2NPHASE_TYPED(x, align, type)          \
  78         (-(type)(x) & ((type)(align) - 1))
  79 #define P2ROUNDUP_TYPED(x, align, type)         \
  80         ((((type)(x) - 1) | ((type)(align) - 1)) + 1)
  81 #define P2END_TYPED(x, align, type)             \
  82         (-(~(type)(x) & -(type)(align)))
  83 #define P2PHASEUP_TYPED(x, align, phase, type)  \
  84         ((type)(phase) - (((type)(phase) - (type)(x)) & -(type)(align)))
  85 #define P2CROSS_TYPED(x, y, align, type)        \
  86         (((type)(x) ^ (type)(y)) > (type)(align) - 1)
  87 #define P2SAMEHIGHBIT_TYPED(x, y, type)         \
  88         (((type)(x) ^ (type)(y)) < ((type)(x) & (type)(y)))
  89
  90
  91 /* avoid any possibility of clashing with <stddef.h> version */
  92 #if defined(_KERNEL) && !defined(_KMEMUSER) && !defined(offsetof)
  93 #define offsetof(s, m)  ((size_t)(&(((s *)0)->m)))
  94 #endif
  95
  96 #endif /* _LIBSPL_SYS_SYSMACROS_H */