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Annotation of kernel/kernserv/c_utils.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* 
        !            26:  * Copyright (c) 1992 NeXT, Inc.  All rights reserved.
        !            27:  *
        !            28:  * c_utils.h -- Helpful C macros
        !            29:  */
        !            30: 
        !            31: #define        ROUND_UP(addr, align)   \
        !            32:        ( ( (unsigned)(addr) + (align) - 1) & ~((align) - 1) )
        !            33: 
        !            34: #define        TRUNC_DOWN(addr, align) \
        !            35:        ( (unsigned)(addr) & ~((align) - 1) )
        !            36: 
        !            37: /*
        !            38:  * FIXME: For some reason the compiler miscalculates the alignment of
        !            39:  * struct uthread as 0, so this forces all structs to have an alignof of
        !            40:  * 16.
        !            41:  */
        !            42: #define        COMPILER_BUG    1
        !            43: 
        !            44: #ifdef COMPILER_BUG
        !            45: #define        ROUND_PTR(type, addr)   \
        !            46:        (type *)( ( (unsigned)(addr) + 16 - 1) \
        !            47:                  & ~(16 - 1) )
        !            48: 
        !            49: #define        TRUNC_PTR(type, addr)   \
        !            50:        (type *)( (unsigned)(addr) & ~(16 - 1) )
        !            51: #else  /* COMPILER_BUG */
        !            52: #define        ROUND_PTR(type, addr)   \
        !            53:        (type *)( ( (unsigned)(addr) + __alignof__(type) - 1) \
        !            54:                  & ~(__alignof__(type) - 1) )
        !            55: 
        !            56: #define        TRUNC_PTR(type, addr)   \
        !            57:        (type *)( (unsigned)(addr) & ~(__alignof__(type) - 1) )
        !            58: #endif /* COMPILER_BUG */
        !            59: 
        !            60: #define        ARRAY_ELEM(x)           (sizeof(x)/sizeof(x[0]))

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