171 строка
4.6 KiB
C
171 строка
4.6 KiB
C
/*
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* Port on Texas Instruments TMS320C6x architecture
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*
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* Copyright (C) 2004, 2009, 2010 Texas Instruments Incorporated
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* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
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* Rewritten for 2.6.3x: Mark Salter <msalter@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef _ASM_C6X_UNALIGNED_H
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#define _ASM_C6X_UNALIGNED_H
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#include <linux/swab.h>
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/*
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* The C64x+ can do unaligned word and dword accesses in hardware
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* using special load/store instructions.
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*/
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static inline u16 get_unaligned_le16(const void *p)
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{
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const u8 *_p = p;
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return _p[0] | _p[1] << 8;
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}
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static inline u16 get_unaligned_be16(const void *p)
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{
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const u8 *_p = p;
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return _p[0] << 8 | _p[1];
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}
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static inline void put_unaligned_le16(u16 val, void *p)
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{
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u8 *_p = p;
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_p[0] = val;
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_p[1] = val >> 8;
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}
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static inline void put_unaligned_be16(u16 val, void *p)
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{
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u8 *_p = p;
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_p[0] = val >> 8;
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_p[1] = val;
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}
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static inline u32 get_unaligned32(const void *p)
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{
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u32 val = (u32) p;
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asm (" ldnw .d1t1 *%0,%0\n"
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" nop 4\n"
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: "+a"(val));
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return val;
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}
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static inline void put_unaligned32(u32 val, void *p)
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{
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asm volatile (" stnw .d2t1 %0,*%1\n"
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: : "a"(val), "b"(p) : "memory");
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}
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static inline u64 get_unaligned64(const void *p)
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{
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u64 val;
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asm volatile (" ldndw .d1t1 *%1,%0\n"
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" nop 4\n"
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: "=a"(val) : "a"(p));
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return val;
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}
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static inline void put_unaligned64(u64 val, const void *p)
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{
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asm volatile (" stndw .d2t1 %0,*%1\n"
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: : "a"(val), "b"(p) : "memory");
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}
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#ifdef CONFIG_CPU_BIG_ENDIAN
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#define get_unaligned_le32(p) __swab32(get_unaligned32(p))
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#define get_unaligned_le64(p) __swab64(get_unaligned64(p))
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#define get_unaligned_be32(p) get_unaligned32(p)
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#define get_unaligned_be64(p) get_unaligned64(p)
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#define put_unaligned_le32(v, p) put_unaligned32(__swab32(v), (p))
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#define put_unaligned_le64(v, p) put_unaligned64(__swab64(v), (p))
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#define put_unaligned_be32(v, p) put_unaligned32((v), (p))
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#define put_unaligned_be64(v, p) put_unaligned64((v), (p))
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#define get_unaligned __get_unaligned_be
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#define put_unaligned __put_unaligned_be
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#else
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#define get_unaligned_le32(p) get_unaligned32(p)
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#define get_unaligned_le64(p) get_unaligned64(p)
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#define get_unaligned_be32(p) __swab32(get_unaligned32(p))
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#define get_unaligned_be64(p) __swab64(get_unaligned64(p))
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#define put_unaligned_le32(v, p) put_unaligned32((v), (p))
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#define put_unaligned_le64(v, p) put_unaligned64((v), (p))
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#define put_unaligned_be32(v, p) put_unaligned32(__swab32(v), (p))
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#define put_unaligned_be64(v, p) put_unaligned64(__swab64(v), (p))
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#define get_unaligned __get_unaligned_le
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#define put_unaligned __put_unaligned_le
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#endif
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/*
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* Cause a link-time error if we try an unaligned access other than
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* 1,2,4 or 8 bytes long
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*/
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extern int __bad_unaligned_access_size(void);
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#define __get_unaligned_le(ptr) (typeof(*(ptr)))({ \
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sizeof(*(ptr)) == 1 ? *(ptr) : \
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(sizeof(*(ptr)) == 2 ? get_unaligned_le16((ptr)) : \
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(sizeof(*(ptr)) == 4 ? get_unaligned_le32((ptr)) : \
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(sizeof(*(ptr)) == 8 ? get_unaligned_le64((ptr)) : \
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__bad_unaligned_access_size()))); \
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})
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#define __get_unaligned_be(ptr) (__force typeof(*(ptr)))({ \
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sizeof(*(ptr)) == 1 ? *(ptr) : \
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(sizeof(*(ptr)) == 2 ? get_unaligned_be16((ptr)) : \
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(sizeof(*(ptr)) == 4 ? get_unaligned_be32((ptr)) : \
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(sizeof(*(ptr)) == 8 ? get_unaligned_be64((ptr)) : \
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__bad_unaligned_access_size()))); \
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})
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#define __put_unaligned_le(val, ptr) ({ \
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void *__gu_p = (ptr); \
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switch (sizeof(*(ptr))) { \
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case 1: \
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*(u8 *)__gu_p = (__force u8)(val); \
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break; \
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case 2: \
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put_unaligned_le16((__force u16)(val), __gu_p); \
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break; \
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case 4: \
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put_unaligned_le32((__force u32)(val), __gu_p); \
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break; \
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case 8: \
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put_unaligned_le64((__force u64)(val), __gu_p); \
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break; \
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default: \
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__bad_unaligned_access_size(); \
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break; \
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} \
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(void)0; })
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#define __put_unaligned_be(val, ptr) ({ \
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void *__gu_p = (ptr); \
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switch (sizeof(*(ptr))) { \
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case 1: \
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*(u8 *)__gu_p = (__force u8)(val); \
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break; \
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case 2: \
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put_unaligned_be16((__force u16)(val), __gu_p); \
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break; \
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case 4: \
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put_unaligned_be32((__force u32)(val), __gu_p); \
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break; \
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case 8: \
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put_unaligned_be64((__force u64)(val), __gu_p); \
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break; \
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default: \
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__bad_unaligned_access_size(); \
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break; \
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} \
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(void)0; })
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#endif /* _ASM_C6X_UNALIGNED_H */
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