Move architecture-specific includes to arch/$ARCH/include/asm
[oweals/u-boot.git] / arch / sh / include / asm / unaligned-sh4a.h
1 #ifndef __ASM_SH_UNALIGNED_SH4A_H
2 #define __ASM_SH_UNALIGNED_SH4A_H
3
4 /*
5  * SH-4A has support for unaligned 32-bit loads, and 32-bit loads only.
6  * Support for 64-bit accesses are done through shifting and masking
7  * relative to the endianness. Unaligned stores are not supported by the
8  * instruction encoding, so these continue to use the packed
9  * struct.
10  *
11  * The same note as with the movli.l/movco.l pair applies here, as long
12  * as the load is gauranteed to be inlined, nothing else will hook in to
13  * r0 and we get the return value for free.
14  *
15  * NOTE: Due to the fact we require r0 encoding, care should be taken to
16  * avoid mixing these heavily with other r0 consumers, such as the atomic
17  * ops. Failure to adhere to this can result in the compiler running out
18  * of spill registers and blowing up when building at low optimization
19  * levels. See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34777.
20  */
21 #include <linux/types.h>
22 #include <asm/byteorder.h>
23
24 static __always_inline u32 __get_unaligned_cpu32(const u8 *p)
25 {
26         unsigned long unaligned;
27
28         __asm__ __volatile__ (
29                 "movua.l        @%1, %0\n\t"
30                  : "=z" (unaligned)
31                  : "r" (p)
32         );
33
34         return unaligned;
35 }
36
37 struct __una_u16 { u16 x __attribute__((packed)); };
38 struct __una_u32 { u32 x __attribute__((packed)); };
39 struct __una_u64 { u64 x __attribute__((packed)); };
40
41 static inline u16 __get_unaligned_cpu16(const u8 *p)
42 {
43 #ifdef __LITTLE_ENDIAN
44         return p[0] | p[1] << 8;
45 #else
46         return p[0] << 8 | p[1];
47 #endif
48 }
49
50 /*
51  * Even though movua.l supports auto-increment on the read side, it can
52  * only store to r0 due to instruction encoding constraints, so just let
53  * the compiler sort it out on its own.
54  */
55 static inline u64 __get_unaligned_cpu64(const u8 *p)
56 {
57 #ifdef __LITTLE_ENDIAN
58         return (u64)__get_unaligned_cpu32(p + 4) << 32 |
59                     __get_unaligned_cpu32(p);
60 #else
61         return (u64)__get_unaligned_cpu32(p) << 32 |
62                     __get_unaligned_cpu32(p + 4);
63 #endif
64 }
65
66 static inline u16 get_unaligned_le16(const void *p)
67 {
68         return le16_to_cpu(__get_unaligned_cpu16(p));
69 }
70
71 static inline u32 get_unaligned_le32(const void *p)
72 {
73         return le32_to_cpu(__get_unaligned_cpu32(p));
74 }
75
76 static inline u64 get_unaligned_le64(const void *p)
77 {
78         return le64_to_cpu(__get_unaligned_cpu64(p));
79 }
80
81 static inline u16 get_unaligned_be16(const void *p)
82 {
83         return be16_to_cpu(__get_unaligned_cpu16(p));
84 }
85
86 static inline u32 get_unaligned_be32(const void *p)
87 {
88         return be32_to_cpu(__get_unaligned_cpu32(p));
89 }
90
91 static inline u64 get_unaligned_be64(const void *p)
92 {
93         return be64_to_cpu(__get_unaligned_cpu64(p));
94 }
95
96 static inline void __put_le16_noalign(u8 *p, u16 val)
97 {
98         *p++ = val;
99         *p++ = val >> 8;
100 }
101
102 static inline void __put_le32_noalign(u8 *p, u32 val)
103 {
104         __put_le16_noalign(p, val);
105         __put_le16_noalign(p + 2, val >> 16);
106 }
107
108 static inline void __put_le64_noalign(u8 *p, u64 val)
109 {
110         __put_le32_noalign(p, val);
111         __put_le32_noalign(p + 4, val >> 32);
112 }
113
114 static inline void __put_be16_noalign(u8 *p, u16 val)
115 {
116         *p++ = val >> 8;
117         *p++ = val;
118 }
119
120 static inline void __put_be32_noalign(u8 *p, u32 val)
121 {
122         __put_be16_noalign(p, val >> 16);
123         __put_be16_noalign(p + 2, val);
124 }
125
126 static inline void __put_be64_noalign(u8 *p, u64 val)
127 {
128         __put_be32_noalign(p, val >> 32);
129         __put_be32_noalign(p + 4, val);
130 }
131
132 static inline void put_unaligned_le16(u16 val, void *p)
133 {
134 #ifdef __LITTLE_ENDIAN
135         ((struct __una_u16 *)p)->x = val;
136 #else
137         __put_le16_noalign(p, val);
138 #endif
139 }
140
141 static inline void put_unaligned_le32(u32 val, void *p)
142 {
143 #ifdef __LITTLE_ENDIAN
144         ((struct __una_u32 *)p)->x = val;
145 #else
146         __put_le32_noalign(p, val);
147 #endif
148 }
149
150 static inline void put_unaligned_le64(u64 val, void *p)
151 {
152 #ifdef __LITTLE_ENDIAN
153         ((struct __una_u64 *)p)->x = val;
154 #else
155         __put_le64_noalign(p, val);
156 #endif
157 }
158
159 static inline void put_unaligned_be16(u16 val, void *p)
160 {
161 #ifdef __BIG_ENDIAN
162         ((struct __una_u16 *)p)->x = val;
163 #else
164         __put_be16_noalign(p, val);
165 #endif
166 }
167
168 static inline void put_unaligned_be32(u32 val, void *p)
169 {
170 #ifdef __BIG_ENDIAN
171         ((struct __una_u32 *)p)->x = val;
172 #else
173         __put_be32_noalign(p, val);
174 #endif
175 }
176
177 static inline void put_unaligned_be64(u64 val, void *p)
178 {
179 #ifdef __BIG_ENDIAN
180         ((struct __una_u64 *)p)->x = val;
181 #else
182         __put_be64_noalign(p, val);
183 #endif
184 }
185
186 /*
187  * Cause a link-time error if we try an unaligned access other than
188  * 1,2,4 or 8 bytes long
189  */
190 extern void __bad_unaligned_access_size(void);
191
192 #define __get_unaligned_le(ptr) ((__force typeof(*(ptr)))({                     \
193         __builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr),                      \
194         __builtin_choose_expr(sizeof(*(ptr)) == 2, get_unaligned_le16((ptr)),   \
195         __builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_le32((ptr)),   \
196         __builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_le64((ptr)),   \
197         __bad_unaligned_access_size()))));                                      \
198         }))
199
200 #define __get_unaligned_be(ptr) ((__force typeof(*(ptr)))({                     \
201         __builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr),                      \
202         __builtin_choose_expr(sizeof(*(ptr)) == 2, get_unaligned_be16((ptr)),   \
203         __builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_be32((ptr)),   \
204         __builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_be64((ptr)),   \
205         __bad_unaligned_access_size()))));                                      \
206         }))
207
208 #define __put_unaligned_le(val, ptr) ({                                 \
209         void *__gu_p = (ptr);                                           \
210         switch (sizeof(*(ptr))) {                                       \
211         case 1:                                                         \
212                 *(u8 *)__gu_p = (__force u8)(val);                      \
213                 break;                                                  \
214         case 2:                                                         \
215                 put_unaligned_le16((__force u16)(val), __gu_p);         \
216                 break;                                                  \
217         case 4:                                                         \
218                 put_unaligned_le32((__force u32)(val), __gu_p);         \
219                 break;                                                  \
220         case 8:                                                         \
221                 put_unaligned_le64((__force u64)(val), __gu_p);         \
222                 break;                                                  \
223         default:                                                        \
224                 __bad_unaligned_access_size();                          \
225                 break;                                                  \
226         }                                                               \
227         (void)0; })
228
229 #define __put_unaligned_be(val, ptr) ({                                 \
230         void *__gu_p = (ptr);                                           \
231         switch (sizeof(*(ptr))) {                                       \
232         case 1:                                                         \
233                 *(u8 *)__gu_p = (__force u8)(val);                      \
234                 break;                                                  \
235         case 2:                                                         \
236                 put_unaligned_be16((__force u16)(val), __gu_p);         \
237                 break;                                                  \
238         case 4:                                                         \
239                 put_unaligned_be32((__force u32)(val), __gu_p);         \
240                 break;                                                  \
241         case 8:                                                         \
242                 put_unaligned_be64((__force u64)(val), __gu_p);         \
243                 break;                                                  \
244         default:                                                        \
245                 __bad_unaligned_access_size();                          \
246                 break;                                                  \
247         }                                                               \
248         (void)0; })
249
250 #ifdef __LITTLE_ENDIAN
251 # define get_unaligned __get_unaligned_le
252 # define put_unaligned __put_unaligned_le
253 #else
254 # define get_unaligned __get_unaligned_be
255 # define put_unaligned __put_unaligned_be
256 #endif
257
258 #endif /* __ASM_SH_UNALIGNED_SH4A_H */