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Annotation of kernel/kernserv/c_utils.h, revision 1.1.1.1

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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