1 #ifndef CYGONCE_HAL_HAL_ENDIAN_H
2 #define CYGONCE_HAL_HAL_ENDIAN_H
4 //=============================================================================
8 // Endian conversion macros
10 //=============================================================================
11 //####ECOSGPLCOPYRIGHTBEGIN####
12 // -------------------------------------------
13 // This file is part of eCos, the Embedded Configurable Operating System.
14 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
16 // eCos is free software; you can redistribute it and/or modify it under
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22 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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27 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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30 // or inline functions from this file, or you compile this file and link it
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40 // at http://sources.redhat.com/ecos/ecos-license/
41 // -------------------------------------------
42 //####ECOSGPLCOPYRIGHTEND####
43 //=============================================================================
44 //#####DESCRIPTIONBEGIN####
49 // Purpose: Endian conversion macros
50 // Usage: #include <cyg/hal/hal_endian.h>
52 //####DESCRIPTIONEND####
54 //=============================================================================
56 #include <pkgconf/hal.h> // CYGBLD_HAL_ENDIAN_H
57 #include <cyg/infra/cyg_type.h> // endian setting
59 // Allow HALs to override the generic implementation of swap macros
60 #ifdef CYGBLD_HAL_ENDIAN_H
61 # include CYGBLD_HAL_ENDIAN_H
65 # define CYG_SWAP16(_x_) \
66 ({ cyg_uint16 _x = (_x_); ((_x << 8) | (_x >> 8)); })
70 # define CYG_SWAP32(_x_) \
71 ({ cyg_uint32 _x = (_x_); \
73 ((0x0000FF00UL & _x) << 8) | \
74 ((0x00FF0000UL & _x) >> 8) | \
79 #if (CYG_BYTEORDER == CYG_LSBFIRST)
80 # define CYG_CPU_TO_BE16(_x_) CYG_SWAP16((_x_))
81 # define CYG_CPU_TO_BE32(_x_) CYG_SWAP32((_x_))
82 # define CYG_BE16_TO_CPU(_x_) CYG_SWAP16((_x_))
83 # define CYG_BE32_TO_CPU(_x_) CYG_SWAP32((_x_))
85 # define CYG_CPU_TO_LE16(_x_) (_x_)
86 # define CYG_CPU_TO_LE32(_x_) (_x_)
87 # define CYG_LE16_TO_CPU(_x_) (_x_)
88 # define CYG_LE32_TO_CPU(_x_) (_x_)
90 #elif (CYG_BYTEORDER == CYG_MSBFIRST)
92 # define CYG_CPU_TO_BE16(_x_) (_x_)
93 # define CYG_CPU_TO_BE32(_x_) (_x_)
94 # define CYG_BE16_TO_CPU(_x_) (_x_)
95 # define CYG_BE32_TO_CPU(_x_) (_x_)
97 # define CYG_CPU_TO_LE16(_x_) CYG_SWAP16((_x_))
98 # define CYG_CPU_TO_LE32(_x_) CYG_SWAP32((_x_))
99 # define CYG_LE16_TO_CPU(_x_) CYG_SWAP16((_x_))
100 # define CYG_LE32_TO_CPU(_x_) CYG_SWAP32((_x_))
104 # error "Endian mode not selected"
108 //-----------------------------------------------------------------------------
109 #endif // CYGONCE_HAL_HAL_ENDIAN_H
110 // End of hal_endian.h