src/helper/types.h

   1 /***************************************************************************
   2  *   Copyright (C) 2004, 2005 by Dominic Rath                              *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
   6  *   oyvind.harboe@zylin.com                                               *
   7  *                                                                         *
   8  *   This program is free software; you can redistribute it and/or modify  *
   9  *   it under the terms of the GNU General Public License as published by  *
  10  *   the Free Software Foundation; either version 2 of the License, or     *
  11  *   (at your option) any later version.                                   *
  12  *                                                                         *
  13  *   This program is distributed in the hope that it will be useful,       *
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  16  *   GNU General Public License for more details.                          *
  17  *                                                                         *
  18  *   You should have received a copy of the GNU General Public License     *
  19  *   along with this program; if not, write to the                         *
  20  *   Free Software Foundation, Inc.,                                       *
  21  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  22  ***************************************************************************/
  23 #ifndef TYPES_H
  24 #define TYPES_H
  25
  26 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 #ifdef HAVE_SYS_TYPES_H
  31 #include <sys/types.h>
  32 #endif
  33
  34 #ifndef u8
  35 typedef unsigned char u8;
  36 #endif
  37
  38 #ifndef u16
  39 typedef unsigned short u16;
  40 #endif
  41
  42 #ifndef u32
  43 typedef unsigned int u32;
  44 #endif
  45
  46 #ifndef u64
  47 typedef unsigned long long u64;
  48 #endif
  49
  50 typedef struct jtag_tap_s jtag_tap_t;
  51
  52 #ifdef HAVE_STDBOOL_H
  53 #include <stdbool.h>
  54 #else   /* HAVE_STDBOOL_H */
  55 #define __bool_true_false_are_defined 1
  56
  57 #ifndef __cplusplus
  58
  59 #define false   0
  60 #define true            1
  61
  62 #define bool            _Bool
  63 typedef int _Bool;
  64 #endif  /* __cplusplus */
  65
  66 #endif  /* HAVE_STDBOOL_H */
  67
  68 /* DANGER!!!! here be dragons!
  69  *
  70  * Leave these fn's as byte accesses because it is safe
  71  * across architectures. Clever usage of 32 bit access
  72  * will create problems on some hosts.
  73  *
  74  * Note that the "buf" pointer in memory is probably unaligned.
  75  *
  76  * Were these functions to be re-written to take a 32 bit wide or 16 bit wide
  77  * memory access shortcut, then on some CPU's, i.e. ARM7, the 2 lsbytes of the address are
  78  * ignored for 32 bit access, whereas on other CPU's a 32 bit wide unaligned memory access
  79  * will cause an exception, and lastly on x86, an unaligned "greater than bytewide"
  80  * memory access works as if aligned.  So what follows below will work for all
  81  * platforms and gives the compiler leeway to do its own platform specific optimizations.
  82  *
  83  * Again, note that the "buf" pointer in memory is probably unaligned.
  84  */
  85
  86
  87 static inline u32 le_to_h_u32(const u8* buf)
  88 {
  89         return (u32)(buf[0] | buf[1] << 8 | buf[2] << 16 | buf[3] << 24);
  90 }
  91
  92 static inline u16 le_to_h_u16(const u8* buf)
  93 {
  94         return (u16)(buf[0] | buf[1] << 8);
  95 }
  96
  97 static inline u32 be_to_h_u32(const u8* buf)
  98 {
  99         return (u32)(buf[3] | buf[2] << 8 | buf[1] << 16 | buf[0] << 24);
 100 }
 101
 102 static inline u16 be_to_h_u16(const u8* buf)
 103 {
 104         return (u16)(buf[1] | buf[0] << 8);
 105 }
 106
 107 static inline void h_u32_to_le(u8* buf, int val)
 108 {
 109         buf[3] = (u8) (val >> 24);
 110         buf[2] = (u8) (val >> 16);
 111         buf[1] = (u8) (val >> 8);
 112         buf[0] = (u8) (val >> 0);
 113 }
 114
 115 static inline void h_u32_to_be(u8* buf, int val)
 116 {
 117         buf[0] = (u8) (val >> 24);
 118         buf[1] = (u8) (val >> 16);
 119         buf[2] = (u8) (val >> 8);
 120         buf[3] = (u8) (val >> 0);
 121 }
 122
 123 static inline void h_u16_to_le(u8* buf, int val)
 124 {
 125         buf[1] = (u8) (val >> 8);
 126         buf[0] = (u8) (val >> 0);
 127 }
 128
 129 static inline void h_u16_to_be(u8* buf, int val)
 130 {
 131         buf[0] = (u8) (val >> 8);
 132         buf[1] = (u8) (val >> 0);
 133 }
 134
 135 #endif /* TYPES_H */