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kernel/linux-imx6_3.14.28/include/linux/unaligned/generic.h 2.08 KB
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  #ifndef _LINUX_UNALIGNED_GENERIC_H
  #define _LINUX_UNALIGNED_GENERIC_H
  
  /*
   * Cause a link-time error if we try an unaligned access other than
   * 1,2,4 or 8 bytes long
   */
  extern void __bad_unaligned_access_size(void);
  
  #define __get_unaligned_le(ptr) ((__force typeof(*(ptr)))({			\
  	__builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr),			\
  	__builtin_choose_expr(sizeof(*(ptr)) == 2, get_unaligned_le16((ptr)),	\
  	__builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_le32((ptr)),	\
  	__builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_le64((ptr)),	\
  	__bad_unaligned_access_size()))));					\
  	}))
  
  #define __get_unaligned_be(ptr) ((__force typeof(*(ptr)))({			\
  	__builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr),			\
  	__builtin_choose_expr(sizeof(*(ptr)) == 2, get_unaligned_be16((ptr)),	\
  	__builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_be32((ptr)),	\
  	__builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_be64((ptr)),	\
  	__bad_unaligned_access_size()))));					\
  	}))
  
  #define __put_unaligned_le(val, ptr) ({					\
  	void *__gu_p = (ptr);						\
  	switch (sizeof(*(ptr))) {					\
  	case 1:								\
  		*(u8 *)__gu_p = (__force u8)(val);			\
  		break;							\
  	case 2:								\
  		put_unaligned_le16((__force u16)(val), __gu_p);		\
  		break;							\
  	case 4:								\
  		put_unaligned_le32((__force u32)(val), __gu_p);		\
  		break;							\
  	case 8:								\
  		put_unaligned_le64((__force u64)(val), __gu_p);		\
  		break;							\
  	default:							\
  		__bad_unaligned_access_size();				\
  		break;							\
  	}								\
  	(void)0; })
  
  #define __put_unaligned_be(val, ptr) ({					\
  	void *__gu_p = (ptr);						\
  	switch (sizeof(*(ptr))) {					\
  	case 1:								\
  		*(u8 *)__gu_p = (__force u8)(val);			\
  		break;							\
  	case 2:								\
  		put_unaligned_be16((__force u16)(val), __gu_p);		\
  		break;							\
  	case 4:								\
  		put_unaligned_be32((__force u32)(val), __gu_p);		\
  		break;							\
  	case 8:								\
  		put_unaligned_be64((__force u64)(val), __gu_p);		\
  		break;							\
  	default:							\
  		__bad_unaligned_access_size();				\
  		break;							\
  	}								\
  	(void)0; })
  
  #endif /* _LINUX_UNALIGNED_GENERIC_H */