1 //<MStar Software>
2 //******************************************************************************
3 // MStar Software
4 // Copyright (c) 2010 - 2012 MStar Semiconductor, Inc. All rights reserved.
5 // All software, firmware and related documentation herein ("MStar Software") are
6 // intellectual property of MStar Semiconductor, Inc. ("MStar") and protected by
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19 // modification/derivatives thereof is transferred to you under Terms.
20 //
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75 //
76 //******************************************************************************
77 //<MStar Software>
78 #ifndef __ARM_BITOPS_H
79 #define __ARM_BITOPS_H
80
81 #include "MsTypes.h"
82 //extern int _test_and_clear_bit_le(U32 bit, U32 *p);
83 extern int _test_and_clear_bit_be(U32 bit, U32 *p);
84 //extern int _test_and_set_bit_le(U32 bit, U32 *p);
85 extern int _test_and_set_bit_be(U32 bit, U32 *p);
86
87 /*
88 * ffs: find first bit set. This is defined the same way as
89 * the libc and compiler builtin ffs routines, therefore
90 * differs in spirit from the above ffz (man ffs).
91 */
92
generic_ffs(int x)93 static __inline__ int generic_ffs(int x)
94 {
95 int r = 1;
96
97 if (!x)
98 return 0;
99 if (!(x & 0xffff)) {
100 x >>= 16;
101 r += 16;
102 }
103 if (!(x & 0xff)) {
104 x >>= 8;
105 r += 8;
106 }
107 if (!(x & 0xf)) {
108 x >>= 4;
109 r += 4;
110 }
111 if (!(x & 3)) {
112 x >>= 2;
113 r += 2;
114 }
115 if (!(x & 1)) {
116 x >>= 1;
117 r += 1;
118 }
119 return r;
120 }
121
122 /*
123 * This routine doesn't need to be atomic.
124 */
125
__test_bit(int nr,const U32 * p)126 static __inline__ int __test_bit(int nr, const U32 * p)
127 {
128 return (p[nr >> 5] >> (nr & 31)) & 1UL;
129 }
130
131
132 /*
133 * ffs: find first bit set. This is defined the same way as
134 * the libc and compiler builtin ffs routines, therefore
135 * differs in spirit from the above ffz (man ffs).
136 */
137
138 #define ffs(x) generic_ffs(x)
139 #define test_bit(nr,p) __test_bit(nr,p)
140 #define clear_bit(nr,addr,type) *(addr) = (volatile type )( (~( (type)1 << (type)nr)) & (type)(*((volatile type *)(addr))))
141 #define set_bit(nr,addr,type) *(addr) = (volatile type )( ( ( (type)1 << (type)nr)) | (type)(*((volatile type *)(addr))))
142
143
_test_and_clear_bit_le(U32 nr,U32 * p)144 static __inline__ int _test_and_clear_bit_le(U32 nr, U32 *p)
145 {
146 int oldVal = (*p >> (nr & 31)) & 1UL;
147
148 clear_bit(nr, p, U32);
149
150 return oldVal;
151 }
152
_test_and_set_bit_le(U32 nr,U32 * p)153 static __inline__ int _test_and_set_bit_le(U32 nr, U32 *p)
154 {
155 int oldVal = (*p >> (nr & 31)) & 1UL;
156
157 set_bit(nr, p, U32);
158
159 return oldVal;
160 }
161
162
163 #ifndef __ARMEB__
164 // These are the little endian, atomic definitions.
165 #define test_and_set_bit(nr,p) _test_and_set_bit_le(nr,p)
166 #define test_and_clear_bit(nr,p) _test_and_clear_bit_le(nr,p)
167 extern int find_next_zero_bit_le (void *p, int size, int offset);
168 #define find_next_zero_bit(p,size,offset) find_next_zero_bit_le(p,size,offset)
169 #else
170 // These are the big endian, atomic definitions.
171 #define test_and_set_bit(nr,p) _test_and_set_bit_be(nr,p)
172 #define test_and_clear_bit(nr,p) _test_and_clear_bit_be(nr,p)
173 #endif
174
175
176 #endif /* _ARM_BITOPS_H */
177