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 HAVE__BOOL
  58 #ifndef __cplusplus
  59
  60 #define false   0
  61 #define true            1
  62
  63 typedef int _Bool;
  64 #else
  65 typedef bool _Bool;
  66 #endif  /* __cplusplus */
  67 #endif  /* HAVE__BOOL */
  68
  69 #define bool _Bool
  70
  71 #endif  /* HAVE_STDBOOL_H */
  72
  73 /* DANGER!!!! here be dragons!
  74  *
  75  * Leave these fn's as byte accesses because it is safe
  76  * across architectures. Clever usage of 32 bit access
  77  * will create problems on some hosts.
  78  *
  79  * Note that the "buf" pointer in memory is probably unaligned.
  80  *
  81  * Were these functions to be re-written to take a 32 bit wide or 16 bit wide
  82  * memory access shortcut, then on some CPU's, i.e. ARM7, the 2 lsbytes of the address are
  83  * ignored for 32 bit access, whereas on other CPU's a 32 bit wide unaligned memory access
  84  * will cause an exception, and lastly on x86, an unaligned "greater than bytewide"
  85  * memory access works as if aligned.  So what follows below will work for all
  86  * platforms and gives the compiler leeway to do its own platform specific optimizations.
  87  *
  88  * Again, note that the "buf" pointer in memory is probably unaligned.
  89  */
  90
  91
  92 static inline u32 le_to_h_u32(const u8* buf)
  93 {
  94         return (u32)(buf[0] | buf[1] << 8 | buf[2] << 16 | buf[3] << 24);
  95 }
  96
  97 static inline u16 le_to_h_u16(const u8* buf)
  98 {
  99         return (u16)(buf[0] | buf[1] << 8);
 100 }
 101
 102 static inline u32 be_to_h_u32(const u8* buf)
 103 {
 104         return (u32)(buf[3] | buf[2] << 8 | buf[1] << 16 | buf[0] << 24);
 105 }
 106
 107 static inline u16 be_to_h_u16(const u8* buf)
 108 {
 109         return (u16)(buf[1] | buf[0] << 8);
 110 }
 111
 112 static inline void h_u32_to_le(u8* buf, int val)
 113 {
 114         buf[3] = (u8) (val >> 24);
 115         buf[2] = (u8) (val >> 16);
 116         buf[1] = (u8) (val >> 8);
 117         buf[0] = (u8) (val >> 0);
 118 }
 119
 120 static inline void h_u32_to_be(u8* buf, int val)
 121 {
 122         buf[0] = (u8) (val >> 24);
 123         buf[1] = (u8) (val >> 16);
 124         buf[2] = (u8) (val >> 8);
 125         buf[3] = (u8) (val >> 0);
 126 }
 127
 128 static inline void h_u16_to_le(u8* buf, int val)
 129 {
 130         buf[1] = (u8) (val >> 8);
 131         buf[0] = (u8) (val >> 0);
 132 }
 133
 134 static inline void h_u16_to_be(u8* buf, int val)
 135 {
 136         buf[0] = (u8) (val >> 8);
 137         buf[1] = (u8) (val >> 0);
 138 }
 139
 140 #endif /* TYPES_H */