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asm-generic: simplify unaligned.h

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The get_unaligned()/put_unaligned() implementations are more
complex than necessary.

Move everything into one file and use a more compact implementation based
on packed struct access and byte swapping macros.

This patch is based on the Linux kernel commit 803f4e1eab7a
("asm-generic: simplify asm/unaligned.h") by Arnd Bergmann.

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
This commit is contained in:
Jens Wiklander 2023-05-22 14:22:38 +02:00 committed by Tom Rini
parent 51bcd02dce
commit 60f1ba7b68
1 changed files with 72 additions and 15 deletions
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87
include/asm-generic/unaligned.h
View file

@ -1,24 +1,81 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _GENERIC_UNALIGNED_H
#define _GENERIC_UNALIGNED_H
#include <asm/byteorder.h>
#include <linux/unaligned/le_byteshift.h>
#include <linux/unaligned/be_byteshift.h>
#include <linux/unaligned/generic.h>
#define __get_unaligned_t(type, ptr) ({ \
const struct { type x; } __packed * __pptr = (typeof(__pptr))(ptr); \
__pptr->x; \
})
/*
* Select endianness
*/
#if defined(__LITTLE_ENDIAN)
#define get_unaligned __get_unaligned_le
#define put_unaligned __put_unaligned_le
#elif defined(__BIG_ENDIAN)
#define get_unaligned __get_unaligned_be
#define put_unaligned __put_unaligned_be
#else
#error invalid endian
#endif
#define __put_unaligned_t(type, val, ptr) do { \
struct { type x; } __packed * __pptr = (typeof(__pptr))(ptr); \
__pptr->x = (val); \
} while (0)
#define get_unaligned(ptr) __get_unaligned_t(typeof(*(ptr)), (ptr))
#define put_unaligned(val, ptr) __put_unaligned_t(typeof(*(ptr)), (val), (ptr))
static inline u16 get_unaligned_le16(const void *p)
{
return le16_to_cpu(__get_unaligned_t(__le16, p));
}
static inline u32 get_unaligned_le32(const void *p)
{
return le32_to_cpu(__get_unaligned_t(__le32, p));
}
static inline u64 get_unaligned_le64(const void *p)
{
return le64_to_cpu(__get_unaligned_t(__le64, p));
}
static inline void put_unaligned_le16(u16 val, void *p)
{
__put_unaligned_t(__le16, cpu_to_le16(val), p);
}
static inline void put_unaligned_le32(u32 val, void *p)
{
__put_unaligned_t(__le32, cpu_to_le32(val), p);
}
static inline void put_unaligned_le64(u64 val, void *p)
{
__put_unaligned_t(__le64, cpu_to_le64(val), p);
}
static inline u16 get_unaligned_be16(const void *p)
{
return be16_to_cpu(__get_unaligned_t(__be16, p));
}
static inline u32 get_unaligned_be32(const void *p)
{
return be32_to_cpu(__get_unaligned_t(__be32, p));
}
static inline u64 get_unaligned_be64(const void *p)
{
return be64_to_cpu(__get_unaligned_t(__be64, p));
}
static inline void put_unaligned_be16(u16 val, void *p)
{
__put_unaligned_t(__be16, cpu_to_be16(val), p);
}
static inline void put_unaligned_be32(u32 val, void *p)
{
__put_unaligned_t(__be32, cpu_to_be32(val), p);
}
static inline void put_unaligned_be64(u64 val, void *p)
{
__put_unaligned_t(__be64, cpu_to_be64(val), p);
}
/* Allow unaligned memory access */
void allow_unaligned(void);