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
get_unaligned_le16(const void * p)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
get_unaligned_be16(const void * p)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
put_unaligned_le16(u16 val,void * p)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
put_unaligned_be16(u16 val,void * p)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
get_unaligned32(const void * p)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
put_unaligned32(u32 val,void * p)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
get_unaligned64(const void * p)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
put_unaligned64(u64 val,const void * p)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 */
171