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author | Thomas Huth <thuth@linux.vnet.ibm.com> | 2011-06-29 13:18:28 +0200 |
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committer | Thomas Huth <thuth@linux.vnet.ibm.com> | 2011-10-12 08:43:12 +0200 |
commit | 2e2e4cae3728d7c4565cae90e687555a7df1af12 (patch) | |
tree | 39ccc9ef131065739b5a1343c53598bb0927dcf8 /include | |
parent | b94bde008b0d49ec4bfe933e110d0952d032ac28 (diff) | |
download | SLOF-2e2e4cae3728d7c4565cae90e687555a7df1af12.zip SLOF-2e2e4cae3728d7c4565cae90e687555a7df1af12.tar.gz SLOF-2e2e4cae3728d7c4565cae90e687555a7df1af12.tar.bz2 |
Move functions for byte-swapping into common header file.
The byte-swapping functions were scattered all over the source tree, now they
are merged into a new common header file called byteswap.h.
Signed-off-by: <thuth@linux.vnet.ibm.com>
Diffstat (limited to 'include')
-rw-r--r-- | include/byteorder.h | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/include/byteorder.h b/include/byteorder.h new file mode 100644 index 0000000..0d7ebee --- /dev/null +++ b/include/byteorder.h @@ -0,0 +1,78 @@ +/****************************************************************************** + * Copyright (c) 2011 IBM Corporation + * All rights reserved. + * This program and the accompanying materials + * are made available under the terms of the BSD License + * which accompanies this distribution, and is available at + * http://www.opensource.org/licenses/bsd-license.php + * + * Contributors: + * IBM Corporation - initial implementation + *****************************************************************************/ + +/* + * Common byteorder (endianess) macros + */ + +#ifndef BYTEORDER_H +#define BYTEORDER_H + +static inline uint16_t +bswap_16 (uint16_t x) +{ + return ((x&0xff00) >> 8) | ((x&0xff) << 8); +} + +static inline uint32_t +bswap_32 (uint32_t x) +{ + return bswap_16(x >> 16) | (bswap_16(x) << 16); +} + +static inline uint64_t +bswap_64 (uint64_t x) +{ + return (uint64_t) bswap_32(x >> 32) | (uint64_t) bswap_32(x) << 32; +} + + +/* gcc defines __BIG_ENDIAN__ on big endian targets */ +#ifdef __BIG_ENDIAN__ + +#define cpu_to_be16(x) (x) +#define cpu_to_be32(x) (x) +#define cpu_to_be64(x) (x) + +#define be16_to_cpu(x) (x) +#define be32_to_cpu(x) (x) +#define be64_to_cpu(x) (x) + +#define le16_to_cpu(x) bswap_16(x) +#define le32_to_cpu(x) bswap_32(x) +#define le64_to_cpu(x) bswap_64(x) + +#define cpu_to_le16(x) bswap_16(x) +#define cpu_to_le32(x) bswap_32(x) +#define cpu_to_le64(x) bswap_64(x) + +#else + +#define cpu_to_be16(x) bswap_16(x) +#define cpu_to_be32(x) bswap_32(x) +#define cpu_to_be64(x) bswap_64(x) + +#define be16_to_cpu(x) bswap_16(x) +#define be32_to_cpu(x) bswap_32(x) +#define be64_to_cpu(x) bswap_64(x) + +#define le16_to_cpu(x) (x) +#define le32_to_cpu(x) (x) +#define le64_to_cpu(x) (x) + +#define cpu_to_le16(x) (x) +#define cpu_to_le32(x) (x) +#define cpu_to_le64(x) (x) + +#endif /* __BIG_ENDIAN__ */ + +#endif /* BYTEORDER_H */ |