From edea3a434ccae8dc980c715949287c9ba63babf5 Mon Sep 17 00:00:00 2001 From: Michael Brown Date: Sun, 8 May 2016 00:18:35 +0100 Subject: [arm] Split out 32-bit-specific code to arch/arm32 Signed-off-by: Michael Brown --- src/arch/arm32/include/bits/byteswap.h | 52 ++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 src/arch/arm32/include/bits/byteswap.h (limited to 'src/arch/arm32/include/bits/byteswap.h') diff --git a/src/arch/arm32/include/bits/byteswap.h b/src/arch/arm32/include/bits/byteswap.h new file mode 100644 index 000000000..1fc884bd8 --- /dev/null +++ b/src/arch/arm32/include/bits/byteswap.h @@ -0,0 +1,52 @@ +#ifndef _BITS_BYTESWAP_H +#define _BITS_BYTESWAP_H + +/** @file + * + * Byte-order swapping functions + * + */ + +#include + +FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); + +static inline __attribute__ (( always_inline, const )) uint16_t +__bswap_variable_16 ( uint16_t x ) { + __asm__ ( "rev16 %0, %1" : "=l" ( x ) : "l" ( x ) ); + return x; +} + +static inline __attribute__ (( always_inline )) void +__bswap_16s ( uint16_t *x ) { + *x = __bswap_variable_16 ( *x ); +} + +static inline __attribute__ (( always_inline, const )) uint32_t +__bswap_variable_32 ( uint32_t x ) { + __asm__ ( "rev %0, %1" : "=l" ( x ) : "l" ( x ) ); + return x; +} + +static inline __attribute__ (( always_inline )) void +__bswap_32s ( uint32_t *x ) { + *x = __bswap_variable_32 ( *x ); +} + +static inline __attribute__ (( always_inline, const )) uint64_t +__bswap_variable_64 ( uint64_t x ) { + uint32_t in_high = ( x >> 32 ); + uint32_t in_low = ( x & 0xffffffffUL ); + uint32_t out_high = __bswap_variable_32 ( in_low ); + uint32_t out_low = __bswap_variable_32 ( in_high ); + + return ( ( ( ( uint64_t ) out_high ) << 32 ) | + ( ( uint64_t ) out_low ) ); +} + +static inline __attribute__ (( always_inline )) void +__bswap_64s ( uint64_t *x ) { + *x = __bswap_variable_64 ( *x ); +} + +#endif -- cgit v1.2.3-55-g7522