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Diffstat (limited to 'mbglib/common/mbg_arch.h')
| -rw-r--r-- | mbglib/common/mbg_arch.h | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/mbglib/common/mbg_arch.h b/mbglib/common/mbg_arch.h new file mode 100644 index 0000000..00d8d5a --- /dev/null +++ b/mbglib/common/mbg_arch.h @@ -0,0 +1,181 @@ + +/************************************************************************** + * + * $Id: mbg_arch.h 1.5.1.1 2014/10/29 14:21:17 martin TEST $ + * + * Copyright (c) Meinberg Funkuhren, Bad Pyrmont, Germany + * + * Description: + * Definitions to support different computer hardware architectures. + * + * For a good summary of predefined macros which can be used to determine + * the build environment, the target environment, and architecture, see: + * http://sourceforge.net/p/predef/wiki/Home/ + * + * ----------------------------------------------------------------------- + * $Log: mbg_arch.h $ + * Revision 1.5.1.1 2014/10/29 14:21:17 martin + * Revision 1.5 2014/03/11 16:01:55 martin + * Added a comment. + * Revision 1.4 2012/10/02 18:32:00 martin + * Include words.h and, conditionally, stdlib.h. + * Use generic preprocessor symbol MBG_TGT_KERNEL. + * Revision 1.3 2009/06/12 13:12:37Z martin + * Fixed compiler warning. + * Revision 1.2 2009/03/19 15:14:15 martin + * Fixed byte swapping of doubles for SPARC architecture. + * Revision 1.1 2008/12/05 13:47:42 martin + * Initial revision. + * + **************************************************************************/ + +#ifndef _MBG_ARCH_H +#define _MBG_ARCH_H + +#include <mbg_tgt.h> +#include <words.h> + +#if !defined( MBG_TGT_KERNEL ) + #include <stdlib.h> +#endif + + +#if defined( MBG_ARCH_SPARC ) + #define MBG_ARCH_BIG_ENDIAN 1 +#endif + + +#if !defined( MBG_ARCH_BIG_ENDIAN ) + #define MBG_ARCH_LITTLE_ENDIAN 1 +#endif + + + +#if defined( MBG_TGT_LINUX ) + + #include <asm/byteorder.h> + + #if defined( MBG_TGT_KERNEL ) + #include <asm/unaligned.h> + + #define _mbg_put_unaligned( _v, _p ) put_unaligned( _v, _p ) + #define _mbg_get_unaligned( _p ) get_unaligned( _p ) + #endif + +#endif + + + +// If no macros required to access unaligned data have yet been defined, +// define some default macros assuming no special handling is required +// to access unaligned data. + +#if !defined( _mbg_put_unaligned ) + #define _mbg_put_unaligned( _v, _p ) ((void)( *(_p) = (_v) )) +#endif + +#if !defined( _mbg_get_unaligned ) + #define _mbg_get_unaligned( _p ) (*(_p)) +#endif + + + +// If no macros to convert endianess have yet been defined, define +// some default macros assuming endianess conversion is not required. + +#if !defined( __le16_to_cpu ) + #define __le16_to_cpu( _x ) (_x) +#endif + +#if !defined( __le32_to_cpu ) + #define __le32_to_cpu( _x ) (_x) +#endif + +#if !defined( __le64_to_cpu ) + #define __le64_to_cpu( _x ) (_x) +#endif + +#if !defined( __cpu_to_le16 ) + #define __cpu_to_le16( _x ) (_x) +#endif + +#if !defined( __cpu_to_le32 ) + #define __cpu_to_le32( _x ) (_x) +#endif + +#if !defined( __cpu_to_le64 ) + #define __cpu_to_le64( _x ) (_x) +#endif + + + +// The macros below are used to convert the endianess +// of the plug-in cards to the endianess of the host CPU + +#define _mbg8_to_cpu( _x ) ( _x ) +#define _mbg16_to_cpu( _x ) __le16_to_cpu( _x ) +#define _mbg32_to_cpu( _x ) __le32_to_cpu( _x ) +#define _mbg64_to_cpu( _x ) __le64_to_cpu( _x ) + +#define _cpu_to_mbg8( _x ) ( _x ) +#define _cpu_to_mbg16( _x ) __cpu_to_le16( _x ) +#define _cpu_to_mbg32( _x ) __cpu_to_le32( _x ) +#define _cpu_to_mbg64( _x ) __cpu_to_le64( _x ) + + + +// swap a double type variable bytewise e.g. to convert the endianess + +static __mbg_inline +void mbg_swab_double( double *p ) +{ +#if 0 // The __swab64() may not work correctly for whatever reason ... + __swab64p( p ); +#else // ... so we do the swapping manually + double d = 0; + size_t i; + + for ( i = 0; i < sizeof( double); i++ ) + BYTE_OF( d, i ) = BYTE_OF( *p, ( sizeof( double) - 1 - i ) ); + + for ( i = 0; i < sizeof( double); i++ ) + BYTE_OF( *p, i ) = BYTE_OF( d, i ); +#endif + +} // mbg_swab_double + + + +#if defined( MBG_ARCH_BIG_ENDIAN ) + + #define _mbg_swab16( _p ) *(_p) = __swab16( *(_p) ) + #define _mbg_swab32( _p ) *(_p) = __swab32( *(_p) ) + + #define _mbg_swab_double( _p ) mbg_swab_double( _p ) + + #define _mbg_swab_doubles( _p, _n ) \ + { \ + int i; \ + for ( i = 0; i < (_n); i++ ) \ + _mbg_swab_double( &_p[i] ); \ + } + +#else + + #define _mbg_swab16( _p ) _nop_macro_fnc() + #define _mbg_swab32( _p ) _nop_macro_fnc() + + #define _mbg_swab_double( _p ) _nop_macro_fnc() + + #define _mbg_swab_doubles( _p, _n ) _nop_macro_fnc() + +#endif + + + +//##++++++++++++ +/// @brief A placeholder for yet missing _mbg_swab_..() macros +#define _mbg_swab_dummy( _x ) _nop_macro_fnc() + + +#endif /* _MBG_ARCH_H */ |