linux/arch/c6x/include/asm/unaligned.h

/*
 *  Port on Texas Instruments TMS320C6x architecture
 *
 *  Copyright (C) 2004, 2009, 2010 Texas Instruments Incorporated
 *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
 *  Rewritten for 2.6.3x: Mark Salter <msalter@redhat.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */
#ifndef _ASM_C6X_UNALIGNED_H
#define _ASM_C6X_UNALIGNED_H

#include <linux/swab.h>

/*
 * The C64x+ can do unaligned word and dword accesses in hardware
 * using special load/store instructions.
 */

static inline u16 get_unaligned_le16(const void *p)
{
	const u8 *_p = p;
	return _p[0] | _p[1] << 8;
}

static inline u16 get_unaligned_be16(const void *p)
{
	const u8 *_p = p;
	return _p[0] << 8 | _p[1];
}

static inline void put_unaligned_le16(u16 val, void *p)
{
	u8 *_p = p;
	_p[0] = val;
	_p[1] = val >> 8;
}

static inline void put_unaligned_be16(u16 val, void *p)
{
	u8 *_p = p;
	_p[0] = val >> 8;
	_p[1] = val;
}

static inline u32 get_unaligned32(const void *p)
{
	u32 val = (u32) p;
	asm (" ldnw	.d1t1	*%0,%0\n"
	     " nop     4\n"
	     : "+a"(val));
	return val;
}

static inline void put_unaligned32(u32 val, void *p)
{
	asm volatile (" stnw	.d2t1	%0,*%1\n"
		      : : "a"(val), "b"(p) : "memory");
}

static inline u64 get_unaligned64(const void *p)
{
	u64 val;
	asm volatile (" ldndw	.d1t1	*%1,%0\n"
		      " nop     4\n"
		      : "=a"(val) : "a"(p));
	return val;
}

static inline void put_unaligned64(u64 val, const void *p)
{
	asm volatile (" stndw	.d2t1	%0,*%1\n"
		      : : "a"(val), "b"(p) : "memory");
}

#ifdef CONFIG_CPU_BIG_ENDIAN

#define get_unaligned_le32(p)	 __swab32(get_unaligned32(p))
#define get_unaligned_le64(p)	 __swab64(get_unaligned64(p))
#define get_unaligned_be32(p)	 get_unaligned32(p)
#define get_unaligned_be64(p)	 get_unaligned64(p)
#define put_unaligned_le32(v, p) put_unaligned32(__swab32(v), (p))
#define put_unaligned_le64(v, p) put_unaligned64(__swab64(v), (p))
#define put_unaligned_be32(v, p) put_unaligned32((v), (p))
#define put_unaligned_be64(v, p) put_unaligned64((v), (p))
#define get_unaligned	__get_unaligned_be
#define put_unaligned	__put_unaligned_be

#else

#define get_unaligned_le32(p)	 get_unaligned32(p)
#define get_unaligned_le64(p)	 get_unaligned64(p)
#define get_unaligned_be32(p)	 __swab32(get_unaligned32(p))
#define get_unaligned_be64(p)	 __swab64(get_unaligned64(p))
#define put_unaligned_le32(v, p) put_unaligned32((v), (p))
#define put_unaligned_le64(v, p) put_unaligned64((v), (p))
#define put_unaligned_be32(v, p) put_unaligned32(__swab32(v), (p))
#define put_unaligned_be64(v, p) put_unaligned64(__swab64(v), (p))
#define get_unaligned	__get_unaligned_le
#define put_unaligned	__put_unaligned_le

#endif

/*
 * Cause a link-time error if we try an unaligned access other than
 * 1,2,4 or 8 bytes long
 */
extern int __bad_unaligned_access_size(void);

#define __get_unaligned_le(ptr) (typeof(*(ptr)))({			\
	sizeof(*(ptr)) == 1 ? *(ptr) :					\
	  (sizeof(*(ptr)) == 2 ? get_unaligned_le16((ptr)) :		\
	     (sizeof(*(ptr)) == 4 ? get_unaligned_le32((ptr)) :		\
		(sizeof(*(ptr)) == 8 ? get_unaligned_le64((ptr)) :	\
		   __bad_unaligned_access_size())));			\
	})

#define __get_unaligned_be(ptr) (__force typeof(*(ptr)))({	\
	sizeof(*(ptr)) == 1 ? *(ptr) :					\
	  (sizeof(*(ptr)) == 2 ? get_unaligned_be16((ptr)) :		\
	     (sizeof(*(ptr)) == 4 ? get_unaligned_be32((ptr)) :		\
		(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 /* _ASM_C6X_UNALIGNED_H */