summaryrefslogtreecommitdiffstats
path: root/arch/c6x/include/asm/unaligned.h
blob: b976cb740eaa24cc8f7a2e08dd08043a1a310ec8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
/*
 *  Port on Texas Instruments TMS320C6x architecture
 *
 *  Copyright (C) 2004, 2009, 2010 Texas Instruments Incorporated
 *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
 *  Rewritten for 2.6.3x: Mark Salter <msalter@redhat.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */
#ifndef _ASM_C6X_UNALIGNED_H
#define _ASM_C6X_UNALIGNED_H

#include <linux/swab.h>

/*
 * The C64x+ can do unaligned word and dword accesses in hardware
 * using special load/store instructions.
 */

static inline u16 get_unaligned_le16(const void *p)
{
	const u8 *_p = p;
	return _p[0] | _p[1] << 8;
}

static inline u16 get_unaligned_be16(const void *p)
{
	const u8 *_p = p;
	return _p[0] << 8 | _p[1];
}

static inline void put_unaligned_le16(u16 val, void *p)
{
	u8 *_p = p;
	_p[0] = val;
	_p[1] = val >> 8;
}

static inline void put_unaligned_be16(u16 val, void *p)
{
	u8 *_p = p;
	_p[0] = val >> 8;
	_p[1] = val;
}

static inline u32 get_unaligned32(const void *p)
{
	u32 val = (u32) p;
	asm (" ldnw	.d1t1	*%0,%0\n"
	     " nop     4\n"
	     : "+a"(val));
	return val;
}

static inline void put_unaligned32(u32 val, void *p)
{
	asm volatile (" stnw	.d2t1	%0,*%1\n"
		      : : "a"(val), "b"(p) : "memory");
}

static inline u64 get_unaligned64(const void *p)
{
	u64 val;
	asm volatile (" ldndw	.d1t1	*%1,%0\n"
		      " nop     4\n"
		      : "=a"(val) : "a"(p));
	return val;
}

static inline void put_unaligned64(u64 val, const void *p)
{
	asm volatile (" stndw	.d2t1	%0,*%1\n"
		      : : "a"(val), "b"(p) : "memory");
}

#ifdef CONFIG_CPU_BIG_ENDIAN

#define get_unaligned_le32(p)	 __swab32(get_unaligned32(p))
#define get_unaligned_le64(p)	 __swab64(get_unaligned64(p))
#define get_unaligned_be32(p)	 get_unaligned32(p)
#define get_unaligned_be64(p)	 get_unaligned64(p)
#define put_unaligned_le32(v, p) put_unaligned32(__swab32(v), (p))
#define put_unaligned_le64(v, p) put_unaligned64(__swab64(v), (p))
#define put_unaligned_be32(v, p) put_unaligned32((v), (p))
#define put_unaligned_be64(v, p) put_unaligned64((v), (p))
#define get_unaligned	__get_unaligned_be
#define put_unaligned	__put_unaligned_be

#else

#define get_unaligned_le32(p)	 get_unaligned32(p)
#define get_unaligned_le64(p)	 get_unaligned64(p)
#define get_unaligned_be32(p)	 __swab32(get_unaligned32(p))
#define get_unaligned_be64(p)	 __swab64(get_unaligned64(p))
#define put_unaligned_le32(v, p) put_unaligned32((v), (p))
#define put_unaligned_le64(v, p) put_unaligned64((v), (p))
#define put_unaligned_be32(v, p) put_unaligned32(__swab32(v), (p))
#define put_unaligned_be64(v, p) put_unaligned64(__swab64(v), (p))
#define get_unaligned	__get_unaligned_le
#define put_unaligned	__put_unaligned_le

#endif

/*
 * Cause a link-time error if we try an unaligned access other than
 * 1,2,4 or 8 bytes long
 */
extern int __bad_unaligned_access_size(void);

#define __get_unaligned_le(ptr) (typeof(*(ptr)))({			\
	sizeof(*(ptr)) == 1 ? *(ptr) :					\
	  (sizeof(*(ptr)) == 2 ? get_unaligned_le16((ptr)) :		\
	     (sizeof(*(ptr)) == 4 ? get_unaligned_le32((ptr)) :		\
		(sizeof(*(ptr)) == 8 ? get_unaligned_le64((ptr)) :	\
		   __bad_unaligned_access_size())));			\
	})

#define __get_unaligned_be(ptr) (__force typeof(*(ptr)))({	\
	sizeof(*(ptr)) == 1 ? *(ptr) :					\
	  (sizeof(*(ptr)) == 2 ? get_unaligned_be16((ptr)) :		\
	     (sizeof(*(ptr)) == 4 ? get_unaligned_be32((ptr)) :		\
		(sizeof(*(ptr)) == 8 ? get_unaligned_be64((ptr)) :	\
		   __bad_unaligned_access_size())));			\
	})

#define __put_unaligned_le(val, ptr) ({					\
	void *__gu_p = (ptr);						\
	switch (sizeof(*(ptr))) {					\
	case 1:								\
		*(u8 *)__gu_p = (__force u8)(val);			\
		break;							\
	case 2:								\
		put_unaligned_le16((__force u16)(val), __gu_p);		\
		break;							\
	case 4:								\
		put_unaligned_le32((__force u32)(val), __gu_p);		\
		break;							\
	case 8:								\
		put_unaligned_le64((__force u64)(val), __gu_p);		\
		break;							\
	default:							\
		__bad_unaligned_access_size();				\
		break;							\
	}								\
	(void)0; })

#define __put_unaligned_be(val, ptr) ({					\
	void *__gu_p = (ptr);						\
	switch (sizeof(*(ptr))) {					\
	case 1:								\
		*(u8 *)__gu_p = (__force u8)(val);			\
		break;							\
	case 2:								\
		put_unaligned_be16((__force u16)(val), __gu_p);		\
		break;							\
	case 4:								\
		put_unaligned_be32((__force u32)(val), __gu_p);		\
		break;							\
	case 8:								\
		put_unaligned_be64((__force u64)(val), __gu_p);		\
		break;							\
	default:							\
		__bad_unaligned_access_size();				\
		break;							\
	}								\
	(void)0; })

#endif /* _ASM_C6X_UNALIGNED_H */