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add unaligned access support 

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2010-03-26 16:05:15 +01:00
parent d03831887e
commit 3348c81992
11 changed files with 529 additions and 0 deletions
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19
arch/arm/include/asm/unaligned.h Normal file
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#ifndef _ASM_ARM_UNALIGNED_H
#define _ASM_ARM_UNALIGNED_H
#include <unaligned/le_byteshift.h>
#include <unaligned/be_byteshift.h>
#include <unaligned/generic.h>
/*
* Select endianness
*/
#ifndef __ARMEB__
#define get_unaligned __get_unaligned_le
#define put_unaligned __put_unaligned_le
#else
#define get_unaligned __get_unaligned_be
#define put_unaligned __put_unaligned_be
#endif
#endif /* _ASM_ARM_UNALIGNED_H */

67
include/unaligned/access_ok.h Normal file
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#ifndef _LINUX_UNALIGNED_ACCESS_OK_H
#define _LINUX_UNALIGNED_ACCESS_OK_H
#include <linux/kernel.h>
#include <asm/byteorder.h>
static inline u16 get_unaligned_le16(const void *p)
{
return le16_to_cpup((__le16 *)p);
}
static inline u32 get_unaligned_le32(const void *p)
{
return le32_to_cpup((__le32 *)p);
}
static inline u64 get_unaligned_le64(const void *p)
{
return le64_to_cpup((__le64 *)p);
}
static inline u16 get_unaligned_be16(const void *p)
{
return be16_to_cpup((__be16 *)p);
}
static inline u32 get_unaligned_be32(const void *p)
{
return be32_to_cpup((__be32 *)p);
}
static inline u64 get_unaligned_be64(const void *p)
{
return be64_to_cpup((__be64 *)p);
}
static inline void put_unaligned_le16(u16 val, void *p)
{
*((__le16 *)p) = cpu_to_le16(val);
}
static inline void put_unaligned_le32(u32 val, void *p)
{
*((__le32 *)p) = cpu_to_le32(val);
}
static inline void put_unaligned_le64(u64 val, void *p)
{
*((__le64 *)p) = cpu_to_le64(val);
}
static inline void put_unaligned_be16(u16 val, void *p)
{
*((__be16 *)p) = cpu_to_be16(val);
}
static inline void put_unaligned_be32(u32 val, void *p)
{
*((__be32 *)p) = cpu_to_be32(val);
}
static inline void put_unaligned_be64(u64 val, void *p)
{
*((__be64 *)p) = cpu_to_be64(val);
}
#endif /* _LINUX_UNALIGNED_ACCESS_OK_H */

70
include/unaligned/be_byteshift.h Normal file
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#ifndef _LINUX_UNALIGNED_BE_BYTESHIFT_H
#define _LINUX_UNALIGNED_BE_BYTESHIFT_H
#include <linux/types.h>
static inline u16 __get_unaligned_be16(const u8 *p)
{
return p[0] << 8 | p[1];
}
static inline u32 __get_unaligned_be32(const u8 *p)
{
return p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3];
}
static inline u64 __get_unaligned_be64(const u8 *p)
{
return (u64)__get_unaligned_be32(p) << 32 |
__get_unaligned_be32(p + 4);
}
static inline void __put_unaligned_be16(u16 val, u8 *p)
{
*p++ = val >> 8;
*p++ = val;
}
static inline void __put_unaligned_be32(u32 val, u8 *p)
{
__put_unaligned_be16(val >> 16, p);
__put_unaligned_be16(val, p + 2);
}
static inline void __put_unaligned_be64(u64 val, u8 *p)
{
__put_unaligned_be32(val >> 32, p);
__put_unaligned_be32(val, p + 4);
}
static inline u16 get_unaligned_be16(const void *p)
{
return __get_unaligned_be16((const u8 *)p);
}
static inline u32 get_unaligned_be32(const void *p)
{
return __get_unaligned_be32((const u8 *)p);
}
static inline u64 get_unaligned_be64(const void *p)
{
return __get_unaligned_be64((const u8 *)p);
}
static inline void put_unaligned_be16(u16 val, void *p)
{
__put_unaligned_be16(val, p);
}
static inline void put_unaligned_be32(u32 val, void *p)
{
__put_unaligned_be32(val, p);
}
static inline void put_unaligned_be64(u64 val, void *p)
{
__put_unaligned_be64(val, p);
}
#endif /* _LINUX_UNALIGNED_BE_BYTESHIFT_H */

36
include/unaligned/be_memmove.h Normal file
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#ifndef _LINUX_UNALIGNED_BE_MEMMOVE_H
#define _LINUX_UNALIGNED_BE_MEMMOVE_H
#include <linux/unaligned/memmove.h>
static inline u16 get_unaligned_be16(const void *p)
{
return __get_unaligned_memmove16((const u8 *)p);
}
static inline u32 get_unaligned_be32(const void *p)
{
return __get_unaligned_memmove32((const u8 *)p);
}
static inline u64 get_unaligned_be64(const void *p)
{
return __get_unaligned_memmove64((const u8 *)p);
}
static inline void put_unaligned_be16(u16 val, void *p)
{
__put_unaligned_memmove16(val, p);
}
static inline void put_unaligned_be32(u32 val, void *p)
{
__put_unaligned_memmove32(val, p);
}
static inline void put_unaligned_be64(u64 val, void *p)
{
__put_unaligned_memmove64(val, p);
}
#endif /* _LINUX_UNALIGNED_LE_MEMMOVE_H */

36
include/unaligned/be_struct.h Normal file
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#ifndef _LINUX_UNALIGNED_BE_STRUCT_H
#define _LINUX_UNALIGNED_BE_STRUCT_H
#include <linux/unaligned/packed_struct.h>
static inline u16 get_unaligned_be16(const void *p)
{
return __get_unaligned_cpu16((const u8 *)p);
}
static inline u32 get_unaligned_be32(const void *p)
{
return __get_unaligned_cpu32((const u8 *)p);
}
static inline u64 get_unaligned_be64(const void *p)
{
return __get_unaligned_cpu64((const u8 *)p);
}
static inline void put_unaligned_be16(u16 val, void *p)
{
__put_unaligned_cpu16(val, p);
}
static inline void put_unaligned_be32(u32 val, void *p)
{
__put_unaligned_cpu32(val, p);
}
static inline void put_unaligned_be64(u64 val, void *p)
{
__put_unaligned_cpu64(val, p);
}
#endif /* _LINUX_UNALIGNED_BE_STRUCT_H */

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include/unaligned/generic.h Normal file
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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 */

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include/unaligned/le_byteshift.h Normal file
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#ifndef _LINUX_UNALIGNED_LE_BYTESHIFT_H
#define _LINUX_UNALIGNED_LE_BYTESHIFT_H
#include <linux/types.h>
static inline u16 __get_unaligned_le16(const u8 *p)
{
return p[0] | p[1] << 8;
}
static inline u32 __get_unaligned_le32(const u8 *p)
{
return p[0] | p[1] << 8 | p[2] << 16 | p[3] << 24;
}
static inline u64 __get_unaligned_le64(const u8 *p)
{
return (u64)__get_unaligned_le32(p + 4) << 32 |
__get_unaligned_le32(p);
}
static inline void __put_unaligned_le16(u16 val, u8 *p)
{
*p++ = val;
*p++ = val >> 8;
}
static inline void __put_unaligned_le32(u32 val, u8 *p)
{
__put_unaligned_le16(val >> 16, p + 2);
__put_unaligned_le16(val, p);
}
static inline void __put_unaligned_le64(u64 val, u8 *p)
{
__put_unaligned_le32(val >> 32, p + 4);
__put_unaligned_le32(val, p);
}
static inline u16 get_unaligned_le16(const void *p)
{
return __get_unaligned_le16((const u8 *)p);
}
static inline u32 get_unaligned_le32(const void *p)
{
return __get_unaligned_le32((const u8 *)p);
}
static inline u64 get_unaligned_le64(const void *p)
{
return __get_unaligned_le64((const u8 *)p);
}
static inline void put_unaligned_le16(u16 val, void *p)
{
__put_unaligned_le16(val, p);
}
static inline void put_unaligned_le32(u32 val, void *p)
{
__put_unaligned_le32(val, p);
}
static inline void put_unaligned_le64(u64 val, void *p)
{
__put_unaligned_le64(val, p);
}
#endif /* _LINUX_UNALIGNED_LE_BYTESHIFT_H */

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include/unaligned/le_memmove.h Normal file
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#ifndef _LINUX_UNALIGNED_LE_MEMMOVE_H
#define _LINUX_UNALIGNED_LE_MEMMOVE_H
#include <linux/unaligned/memmove.h>
static inline u16 get_unaligned_le16(const void *p)
{
return __get_unaligned_memmove16((const u8 *)p);
}
static inline u32 get_unaligned_le32(const void *p)
{
return __get_unaligned_memmove32((const u8 *)p);
}
static inline u64 get_unaligned_le64(const void *p)
{
return __get_unaligned_memmove64((const u8 *)p);
}
static inline void put_unaligned_le16(u16 val, void *p)
{
__put_unaligned_memmove16(val, p);
}
static inline void put_unaligned_le32(u32 val, void *p)
{
__put_unaligned_memmove32(val, p);
}
static inline void put_unaligned_le64(u64 val, void *p)
{
__put_unaligned_memmove64(val, p);
}
#endif /* _LINUX_UNALIGNED_LE_MEMMOVE_H */

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include/unaligned/le_struct.h Normal file
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#ifndef _LINUX_UNALIGNED_LE_STRUCT_H
#define _LINUX_UNALIGNED_LE_STRUCT_H
#include <linux/unaligned/packed_struct.h>
static inline u16 get_unaligned_le16(const void *p)
{
return __get_unaligned_cpu16((const u8 *)p);
}
static inline u32 get_unaligned_le32(const void *p)
{
return __get_unaligned_cpu32((const u8 *)p);
}
static inline u64 get_unaligned_le64(const void *p)
{
return __get_unaligned_cpu64((const u8 *)p);
}
static inline void put_unaligned_le16(u16 val, void *p)
{
__put_unaligned_cpu16(val, p);
}
static inline void put_unaligned_le32(u32 val, void *p)
{
__put_unaligned_cpu32(val, p);
}
static inline void put_unaligned_le64(u64 val, void *p)
{
__put_unaligned_cpu64(val, p);
}
#endif /* _LINUX_UNALIGNED_LE_STRUCT_H */

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include/unaligned/memmove.h Normal file
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#ifndef _LINUX_UNALIGNED_MEMMOVE_H
#define _LINUX_UNALIGNED_MEMMOVE_H
#include <linux/kernel.h>
#include <linux/string.h>
/* Use memmove here, so gcc does not insert a __builtin_memcpy. */
static inline u16 __get_unaligned_memmove16(const void *p)
{
u16 tmp;
memmove(&tmp, p, 2);
return tmp;
}
static inline u32 __get_unaligned_memmove32(const void *p)
{
u32 tmp;
memmove(&tmp, p, 4);
return tmp;
}
static inline u64 __get_unaligned_memmove64(const void *p)
{
u64 tmp;
memmove(&tmp, p, 8);
return tmp;
}
static inline void __put_unaligned_memmove16(u16 val, void *p)
{
memmove(p, &val, 2);
}
static inline void __put_unaligned_memmove32(u32 val, void *p)
{
memmove(p, &val, 4);
}
static inline void __put_unaligned_memmove64(u64 val, void *p)
{
memmove(p, &val, 8);
}
#endif /* _LINUX_UNALIGNED_MEMMOVE_H */

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include/unaligned/packed_struct.h Normal file
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#ifndef _LINUX_UNALIGNED_PACKED_STRUCT_H
#define _LINUX_UNALIGNED_PACKED_STRUCT_H
#include <linux/kernel.h>
struct __una_u16 { u16 x __attribute__((packed)); };
struct __una_u32 { u32 x __attribute__((packed)); };
struct __una_u64 { u64 x __attribute__((packed)); };
static inline u16 __get_unaligned_cpu16(const void *p)
{
const struct __una_u16 *ptr = (const struct __una_u16 *)p;
return ptr->x;
}
static inline u32 __get_unaligned_cpu32(const void *p)
{
const struct __una_u32 *ptr = (const struct __una_u32 *)p;
return ptr->x;
}
static inline u64 __get_unaligned_cpu64(const void *p)
{
const struct __una_u64 *ptr = (const struct __una_u64 *)p;
return ptr->x;
}
static inline void __put_unaligned_cpu16(u16 val, void *p)
{
struct __una_u16 *ptr = (struct __una_u16 *)p;
ptr->x = val;
}
static inline void __put_unaligned_cpu32(u32 val, void *p)
{
struct __una_u32 *ptr = (struct __una_u32 *)p;
ptr->x = val;
}
static inline void __put_unaligned_cpu64(u64 val, void *p)
{
struct __una_u64 *ptr = (struct __una_u64 *)p;
ptr->x = val;
}
#endif /* _LINUX_UNALIGNED_PACKED_STRUCT_H */