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![Harvey Harrison](/assets/img/avatar_default.png)
Create a linux/unaligned directory similar in spirit to the linux/byteorder folder to hold generic implementations collected from various arches. Currently there are five implementations: 1) packed_struct.h: C-struct based, from asm-generic/unaligned.h 2) le_byteshift.h: Open coded byte-swapping, heavily based on asm-arm 3) be_byteshift.h: Open coded byte-swapping, heavily based on asm-arm 4) memmove.h: taken from multiple implementations in tree 5) access_ok.h: taken from x86 and others, unaligned access is ok. All of the new implementations checks for sizes not equal to 1,2,4,8 and will fail to link. API additions: get_unaligned_{le16|le32|le64|be16|be32|be64}(p) which is meant to replace code of the form: le16_to_cpu(get_unaligned((__le16 *)p)); put_unaligned_{le16|le32|le64|be16|be32|be64}(val, pointer) which is meant to replace code of the form: put_unaligned(cpu_to_le16(val), (__le16 *)p); The headers that arches should include from their asm/unaligned.h: access_ok.h : Wrappers of the byteswapping functions in asm/byteorder Choose a particular implementation for little-endian access: le_byteshift.h le_memmove.h (arch must be LE) le_struct.h (arch must be LE) Choose a particular implementation for big-endian access: be_byteshift.h be_memmove.h (arch must be BE) be_struct.h (arch must be BE) After including as needed from the above, include unaligned/generic.h and define your arch's get/put_unaligned as (for LE): Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
45 lines
829 B
C
45 lines
829 B
C
#ifndef _LINUX_UNALIGNED_MEMMOVE_H
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#define _LINUX_UNALIGNED_MEMMOVE_H
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#include <linux/kernel.h>
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#include <linux/string.h>
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/* Use memmove here, so gcc does not insert a __builtin_memcpy. */
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static inline u16 __get_unaligned_memmove16(const void *p)
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{
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u16 tmp;
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memmove(&tmp, p, 2);
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return tmp;
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}
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static inline u32 __get_unaligned_memmove32(const void *p)
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{
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u32 tmp;
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memmove(&tmp, p, 4);
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return tmp;
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}
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static inline u64 __get_unaligned_memmove64(const void *p)
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{
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u64 tmp;
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memmove(&tmp, p, 8);
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return tmp;
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}
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static inline void __put_unaligned_memmove16(u16 val, void *p)
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{
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memmove(p, &val, 2);
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}
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static inline void __put_unaligned_memmove32(u32 val, void *p)
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{
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memmove(p, &val, 4);
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}
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static inline void __put_unaligned_memmove64(u64 val, void *p)
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{
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memmove(p, &val, 8);
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}
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#endif /* _LINUX_UNALIGNED_MEMMOVE_H */
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