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

   1 /*
   2  *  Port on Texas Instruments TMS320C6x architecture
   3  *
   4  *  Copyright (C) 2004, 2009, 2010 Texas Instruments Incorporated
   5  *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
   6  *  Rewritten for 2.6.3x: Mark Salter <msalter@redhat.com>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License version 2 as
  10  *  published by the Free Software Foundation.
  11  */
  12 #ifndef _ASM_C6X_UNALIGNED_H
  13 #define _ASM_C6X_UNALIGNED_H
  14
  15 #include <linux/swab.h>
  16
  17 /*
  18  * The C64x+ can do unaligned word and dword accesses in hardware
  19  * using special load/store instructions.
  20  */
  21
  22 static inline u16 get_unaligned_le16(const void *p)
  23 {
  24         const u8 *_p = p;
  25         return _p[0] | _p[1] << 8;
  26 }
  27
  28 static inline u16 get_unaligned_be16(const void *p)
  29 {
  30         const u8 *_p = p;
  31         return _p[0] << 8 | _p[1];
  32 }
  33
  34 static inline void put_unaligned_le16(u16 val, void *p)
  35 {
  36         u8 *_p = p;
  37         _p[0] = val;
  38         _p[1] = val >> 8;
  39 }
  40
  41 static inline void put_unaligned_be16(u16 val, void *p)
  42 {
  43         u8 *_p = p;
  44         _p[0] = val >> 8;
  45         _p[1] = val;
  46 }
  47
  48 static inline u32 get_unaligned32(const void *p)
  49 {
  50         u32 val = (u32) p;
  51         asm (" ldnw     .d1t1   *%0,%0\n"
  52              " nop     4\n"
  53              : "+a"(val));
  54         return val;
  55 }
  56
  57 static inline void put_unaligned32(u32 val, void *p)
  58 {
  59         asm volatile (" stnw    .d2t1   %0,*%1\n"
  60                       : : "a"(val), "b"(p) : "memory");
  61 }
  62
  63 static inline u64 get_unaligned64(const void *p)
  64 {
  65         u64 val;
  66         asm volatile (" ldndw   .d1t1   *%1,%0\n"
  67                       " nop     4\n"
  68                       : "=a"(val) : "a"(p));
  69         return val;
  70 }
  71
  72 static inline void put_unaligned64(u64 val, const void *p)
  73 {
  74         asm volatile (" stndw   .d2t1   %0,*%1\n"
  75                       : : "a"(val), "b"(p) : "memory");
  76 }
  77
  78 #ifdef CONFIG_CPU_BIG_ENDIAN
  79
  80 #define get_unaligned_le32(p)    __swab32(get_unaligned32(p))
  81 #define get_unaligned_le64(p)    __swab64(get_unaligned64(p))
  82 #define get_unaligned_be32(p)    get_unaligned32(p)
  83 #define get_unaligned_be64(p)    get_unaligned64(p)
  84 #define put_unaligned_le32(v, p) put_unaligned32(__swab32(v), (p))
  85 #define put_unaligned_le64(v, p) put_unaligned64(__swab64(v), (p))
  86 #define put_unaligned_be32(v, p) put_unaligned32((v), (p))
  87 #define put_unaligned_be64(v, p) put_unaligned64((v), (p))
  88 #define get_unaligned   __get_unaligned_be
  89 #define put_unaligned   __put_unaligned_be
  90
  91 #else
  92
  93 #define get_unaligned_le32(p)    get_unaligned32(p)
  94 #define get_unaligned_le64(p)    get_unaligned64(p)
  95 #define get_unaligned_be32(p)    __swab32(get_unaligned32(p))
  96 #define get_unaligned_be64(p)    __swab64(get_unaligned64(p))
  97 #define put_unaligned_le32(v, p) put_unaligned32((v), (p))
  98 #define put_unaligned_le64(v, p) put_unaligned64((v), (p))
  99 #define put_unaligned_be32(v, p) put_unaligned32(__swab32(v), (p))
 100 #define put_unaligned_be64(v, p) put_unaligned64(__swab64(v), (p))
 101 #define get_unaligned   __get_unaligned_le
 102 #define put_unaligned   __put_unaligned_le
 103
 104 #endif
 105
 106 /*
 107  * Cause a link-time error if we try an unaligned access other than
 108  * 1,2,4 or 8 bytes long
 109  */
 110 extern int __bad_unaligned_access_size(void);
 111
 112 #define __get_unaligned_le(ptr) (typeof(*(ptr)))({                      \
 113         sizeof(*(ptr)) == 1 ? *(ptr) :                                  \
 114           (sizeof(*(ptr)) == 2 ? get_unaligned_le16((ptr)) :            \
 115              (sizeof(*(ptr)) == 4 ? get_unaligned_le32((ptr)) :         \
 116                 (sizeof(*(ptr)) == 8 ? get_unaligned_le64((ptr)) :      \
 117                    __bad_unaligned_access_size())));                    \
 118         })
 119
 120 #define __get_unaligned_be(ptr) (__force typeof(*(ptr)))({      \
 121         sizeof(*(ptr)) == 1 ? *(ptr) :                                  \
 122           (sizeof(*(ptr)) == 2 ? get_unaligned_be16((ptr)) :            \
 123              (sizeof(*(ptr)) == 4 ? get_unaligned_be32((ptr)) :         \
 124                 (sizeof(*(ptr)) == 8 ? get_unaligned_be64((ptr)) :      \
 125                    __bad_unaligned_access_size())));                    \
 126         })
 127
 128 #define __put_unaligned_le(val, ptr) ({                                 \
 129         void *__gu_p = (ptr);                                           \
 130         switch (sizeof(*(ptr))) {                                       \
 131         case 1:                                                         \
 132                 *(u8 *)__gu_p = (__force u8)(val);                      \
 133                 break;                                                  \
 134         case 2:                                                         \
 135                 put_unaligned_le16((__force u16)(val), __gu_p);         \
 136                 break;                                                  \
 137         case 4:                                                         \
 138                 put_unaligned_le32((__force u32)(val), __gu_p);         \
 139                 break;                                                  \
 140         case 8:                                                         \
 141                 put_unaligned_le64((__force u64)(val), __gu_p);         \
 142                 break;                                                  \
 143         default:                                                        \
 144                 __bad_unaligned_access_size();                          \
 145                 break;                                                  \
 146         }                                                               \
 147         (void)0; })
 148
 149 #define __put_unaligned_be(val, ptr) ({                                 \
 150         void *__gu_p = (ptr);                                           \
 151         switch (sizeof(*(ptr))) {                                       \
 152         case 1:                                                         \
 153                 *(u8 *)__gu_p = (__force u8)(val);                      \
 154                 break;                                                  \
 155         case 2:                                                         \
 156                 put_unaligned_be16((__force u16)(val), __gu_p);         \
 157                 break;                                                  \
 158         case 4:                                                         \
 159                 put_unaligned_be32((__force u32)(val), __gu_p);         \
 160                 break;                                                  \
 161         case 8:                                                         \
 162                 put_unaligned_be64((__force u64)(val), __gu_p);         \
 163                 break;                                                  \
 164         default:                                                        \
 165                 __bad_unaligned_access_size();                          \
 166                 break;                                                  \
 167         }                                                               \
 168         (void)0; })
 169
 170 #endif /* _ASM_C6X_UNALIGNED_H */