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https://github.com/ipxe/ipxe
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[libc] Rewrite byte-swapping code
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
@@ -1,59 +1,138 @@
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#ifndef ETHERBOOT_BYTESWAP_H
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#define ETHERBOOT_BYTESWAP_H
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#ifndef BYTESWAP_H
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#define BYTESWAP_H
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FILE_LICENCE ( GPL2_OR_LATER );
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include "endian.h"
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#include "bits/byteswap.h"
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#include <stdint.h>
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#include <endian.h>
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#include <bits/byteswap.h>
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#define __bswap_constant_16(x) \
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((uint16_t)((((uint16_t)(x) & 0x00ff) << 8) | \
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(((uint16_t)(x) & 0xff00) >> 8)))
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/**
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* Byte-swap a 16-bit constant
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*
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* @v value Constant value
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* @ret swapped Byte-swapped value
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*/
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#define __bswap_constant_16( value ) \
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( ( ( (value) & 0x00ff ) << 8 ) | \
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( ( (value) & 0xff00 ) >> 8 ) )
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#define __bswap_constant_32(x) \
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((uint32_t)((((uint32_t)(x) & 0x000000ffU) << 24) | \
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(((uint32_t)(x) & 0x0000ff00U) << 8) | \
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(((uint32_t)(x) & 0x00ff0000U) >> 8) | \
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(((uint32_t)(x) & 0xff000000U) >> 24)))
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/**
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* Byte-swap a 32-bit constant
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*
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* @v value Constant value
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* @ret swapped Byte-swapped value
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*/
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#define __bswap_constant_32( value ) \
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( ( ( (value) & 0x000000ffUL ) << 24 ) | \
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( ( (value) & 0x0000ff00UL ) << 8 ) | \
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( ( (value) & 0x00ff0000UL ) >> 8 ) | \
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( ( (value) & 0xff000000UL ) >> 24 ) )
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#define __bswap_constant_64(x) \
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((uint64_t)((((uint64_t)(x) & 0x00000000000000ffULL) << 56) | \
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(((uint64_t)(x) & 0x000000000000ff00ULL) << 40) | \
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(((uint64_t)(x) & 0x0000000000ff0000ULL) << 24) | \
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(((uint64_t)(x) & 0x00000000ff000000ULL) << 8) | \
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(((uint64_t)(x) & 0x000000ff00000000ULL) >> 8) | \
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(((uint64_t)(x) & 0x0000ff0000000000ULL) >> 24) | \
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(((uint64_t)(x) & 0x00ff000000000000ULL) >> 40) | \
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(((uint64_t)(x) & 0xff00000000000000ULL) >> 56)))
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/**
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* Byte-swap a 64-bit constant
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*
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* @v value Constant value
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* @ret swapped Byte-swapped value
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*/
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#define __bswap_constant_64( value ) \
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( ( ( (value) & 0x00000000000000ffULL ) << 56 ) | \
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( ( (value) & 0x000000000000ff00ULL ) << 40 ) | \
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( ( (value) & 0x0000000000ff0000ULL ) << 24 ) | \
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( ( (value) & 0x00000000ff000000ULL ) << 8 ) | \
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( ( (value) & 0x000000ff00000000ULL ) >> 8 ) | \
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( ( (value) & 0x0000ff0000000000ULL ) >> 24 ) | \
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( ( (value) & 0x00ff000000000000ULL ) >> 40 ) | \
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( ( (value) & 0xff00000000000000ULL ) >> 56 ) )
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#define __bswap_16(x) \
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((uint16_t)(__builtin_constant_p(x) ? \
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__bswap_constant_16(x) : \
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__bswap_variable_16(x)))
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/**
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* Byte-swap a 16-bit value
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*
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* @v value Value
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* @ret swapped Byte-swapped value
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*/
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#define __bswap_16( value ) \
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( __builtin_constant_p (value) ? \
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( ( uint16_t ) __bswap_constant_16 ( ( uint16_t ) (value) ) ) \
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: __bswap_variable_16 (value) )
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#define bswap_16( value ) __bswap_16 (value)
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#define __bswap_32(x) \
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((uint32_t)(__builtin_constant_p(x) ? \
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__bswap_constant_32(x) : \
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__bswap_variable_32(x)))
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/**
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* Byte-swap a 32-bit value
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*
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* @v value Value
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* @ret swapped Byte-swapped value
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*/
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#define __bswap_32( value ) \
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( __builtin_constant_p (value) ? \
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( ( uint32_t ) __bswap_constant_32 ( ( uint32_t ) (value) ) ) \
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: __bswap_variable_32 (value) )
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#define bswap_32( value ) __bswap_32 (value)
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#define __bswap_64(x) \
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((uint64_t)(__builtin_constant_p(x) ? \
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__bswap_constant_64(x) : \
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__bswap_variable_64(x)))
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/**
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* Byte-swap a 64-bit value
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*
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* @v value Value
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* @ret swapped Byte-swapped value
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*/
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#define __bswap_64( value ) \
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( __builtin_constant_p (value) ? \
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( ( uint64_t ) __bswap_constant_64 ( ( uint64_t ) (value) ) ) \
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: __bswap_variable_64 (value) )
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#define bswap_64( value ) __bswap_64 (value)
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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#include "little_bswap.h"
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#endif
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#if __BYTE_ORDER == __BIG_ENDIAN
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#include "big_bswap.h"
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#define __cpu_to_leNN( bits, value ) (value)
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#define __cpu_to_beNN( bits, value ) __bswap_ ## bits (value)
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#define __leNN_to_cpu( bits, value ) (value)
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#define __beNN_to_cpu( bits, value ) __bswap_ ## bits (value)
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#define __cpu_to_leNNs( bits, ptr ) do { } while ( 0 )
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#define __cpu_to_beNNs( bits, ptr ) __bswap_ ## bits ## s (ptr)
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#define __leNN_to_cpus( bits, ptr ) do { } while ( 0 )
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#define __beNN_to_cpus( bits, ptr ) __bswap_ ## bits ## s (ptr)
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#endif
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/* Make routines available to all */
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#define swap64(x) __bswap_64(x)
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#define swap32(x) __bswap_32(x)
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#define swap16(x) __bswap_16(x)
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#define bswap_64(x) __bswap_64(x)
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#define bswap_32(x) __bswap_32(x)
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#define bswap_16(x) __bswap_16(x)
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#endif /* ETHERBOOT_BYTESWAP_H */
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define __cpu_to_leNN( bits, value ) __bswap_ ## bits (value)
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#define __cpu_to_beNN( bits, value ) (value)
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#define __leNN_to_cpu( bits, value ) __bswap_ ## bits (value)
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#define __beNN_to_cpu( bits, value ) (value)
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#define __cpu_to_leNNs( bits, ptr ) __bswap_ ## bits ## s (ptr)
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#define __cpu_to_beNNs( bits, ptr ) do { } while ( 0 )
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#define __leNN_to_cpus( bits, ptr ) __bswap_ ## bits ## s (ptr)
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#define __beNN_to_cpus( bits, ptr ) do { } while ( 0 )
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#endif
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#define cpu_to_le16( value ) __cpu_to_leNN ( 16, value )
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#define cpu_to_le32( value ) __cpu_to_leNN ( 32, value )
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#define cpu_to_le64( value ) __cpu_to_leNN ( 64, value )
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#define cpu_to_be16( value ) __cpu_to_beNN ( 16, value )
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#define cpu_to_be32( value ) __cpu_to_beNN ( 32, value )
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#define cpu_to_be64( value ) __cpu_to_beNN ( 64, value )
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#define le16_to_cpu( value ) __leNN_to_cpu ( 16, value )
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#define le32_to_cpu( value ) __leNN_to_cpu ( 32, value )
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#define le64_to_cpu( value ) __leNN_to_cpu ( 64, value )
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#define be16_to_cpu( value ) __beNN_to_cpu ( 16, value )
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#define be32_to_cpu( value ) __beNN_to_cpu ( 32, value )
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#define be64_to_cpu( value ) __beNN_to_cpu ( 64, value )
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#define cpu_to_le16s( ptr ) __cpu_to_leNNs ( 16, ptr )
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#define cpu_to_le32s( ptr ) __cpu_to_leNNs ( 32, ptr )
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#define cpu_to_le64s( ptr ) __cpu_to_leNNs ( 64, ptr )
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#define cpu_to_be16s( ptr ) __cpu_to_beNNs ( 16, ptr )
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#define cpu_to_be32s( ptr ) __cpu_to_beNNs ( 32, ptr )
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#define cpu_to_be64s( ptr ) __cpu_to_beNNs ( 64, ptr )
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#define le16_to_cpus( ptr ) __leNN_to_cpus ( 16, ptr )
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#define le32_to_cpus( ptr ) __leNN_to_cpus ( 32, ptr )
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#define le64_to_cpus( ptr ) __leNN_to_cpus ( 64, ptr )
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#define be16_to_cpus( ptr ) __beNN_to_cpus ( 16, ptr )
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#define be32_to_cpus( ptr ) __beNN_to_cpus ( 32, ptr )
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#define be64_to_cpus( ptr ) __beNN_to_cpus ( 64, ptr )
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#define htonll( value ) cpu_to_be64 (value)
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#define ntohll( value ) be64_to_cpu (value)
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#define htonl( value ) cpu_to_be32 (value)
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#define ntohl( value ) be32_to_cpu (value)
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#define htons( value ) cpu_to_be16 (value)
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#define ntohs( value ) be16_to_cpu (value)
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#endif /* BYTESWAP_H */
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