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1408 | serge | 1 | #ifndef _LINUX_BITOPS_H |
2 | #define _LINUX_BITOPS_H |
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1964 | serge | 3 | #include |
1408 | serge | 4 | |
1964 | serge | 5 | #ifdef __KERNEL__ |
1408 | serge | 6 | #define BIT(nr) (1UL << (nr)) |
5056 | serge | 7 | #define BIT_ULL(nr) (1ULL << (nr)) |
1408 | serge | 8 | #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) |
9 | #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) |
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5056 | serge | 10 | #define BIT_ULL_MASK(nr) (1ULL << ((nr) % BITS_PER_LONG_LONG)) |
11 | #define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG) |
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1408 | serge | 12 | #define BITS_PER_BYTE 8 |
13 | #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long)) |
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1964 | serge | 14 | #endif |
1408 | serge | 15 | |
5056 | serge | 16 | /* |
17 | * Create a contiguous bitmask starting at bit position @l and ending at |
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18 | * position @h. For example |
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19 | * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000. |
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20 | */ |
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21 | #define GENMASK(h, l) (((U32_C(1) << ((h) - (l) + 1)) - 1) << (l)) |
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22 | #define GENMASK_ULL(h, l) (((U64_C(1) << ((h) - (l) + 1)) - 1) << (l)) |
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23 | |||
1964 | serge | 24 | extern unsigned int __sw_hweight8(unsigned int w); |
25 | extern unsigned int __sw_hweight16(unsigned int w); |
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26 | extern unsigned int __sw_hweight32(unsigned int w); |
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27 | extern unsigned long __sw_hweight64(__u64 w); |
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28 | |||
1408 | serge | 29 | /* |
30 | * Include this here because some architectures need generic_ffs/fls in |
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31 | * scope |
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32 | */ |
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33 | #include |
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34 | |||
1964 | serge | 35 | #define for_each_set_bit(bit, addr, size) \ |
1408 | serge | 36 | for ((bit) = find_first_bit((addr), (size)); \ |
37 | (bit) < (size); \ |
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38 | (bit) = find_next_bit((addr), (size), (bit) + 1)) |
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39 | |||
3031 | serge | 40 | /* same as for_each_set_bit() but use bit as value to start with */ |
41 | #define for_each_set_bit_from(bit, addr, size) \ |
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42 | for ((bit) = find_next_bit((addr), (size), (bit)); \ |
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43 | (bit) < (size); \ |
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44 | (bit) = find_next_bit((addr), (size), (bit) + 1)) |
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45 | |||
46 | #define for_each_clear_bit(bit, addr, size) \ |
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47 | for ((bit) = find_first_zero_bit((addr), (size)); \ |
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48 | (bit) < (size); \ |
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49 | (bit) = find_next_zero_bit((addr), (size), (bit) + 1)) |
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50 | |||
51 | /* same as for_each_clear_bit() but use bit as value to start with */ |
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52 | #define for_each_clear_bit_from(bit, addr, size) \ |
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53 | for ((bit) = find_next_zero_bit((addr), (size), (bit)); \ |
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54 | (bit) < (size); \ |
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55 | (bit) = find_next_zero_bit((addr), (size), (bit) + 1)) |
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56 | |||
1408 | serge | 57 | static __inline__ int get_bitmask_order(unsigned int count) |
58 | { |
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59 | int order; |
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60 | |||
61 | order = fls(count); |
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62 | return order; /* We could be slightly more clever with -1 here... */ |
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63 | } |
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64 | |||
65 | static __inline__ int get_count_order(unsigned int count) |
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66 | { |
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67 | int order; |
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68 | |||
69 | order = fls(count) - 1; |
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70 | if (count & (count - 1)) |
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71 | order++; |
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72 | return order; |
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73 | } |
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74 | |||
75 | static inline unsigned long hweight_long(unsigned long w) |
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76 | { |
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77 | return sizeof(w) == 4 ? hweight32(w) : hweight64(w); |
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78 | } |
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79 | |||
80 | /** |
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3031 | serge | 81 | * rol64 - rotate a 64-bit value left |
82 | * @word: value to rotate |
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83 | * @shift: bits to roll |
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84 | */ |
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85 | static inline __u64 rol64(__u64 word, unsigned int shift) |
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86 | { |
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87 | return (word << shift) | (word >> (64 - shift)); |
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88 | } |
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89 | |||
90 | /** |
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91 | * ror64 - rotate a 64-bit value right |
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92 | * @word: value to rotate |
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93 | * @shift: bits to roll |
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94 | */ |
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95 | static inline __u64 ror64(__u64 word, unsigned int shift) |
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96 | { |
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97 | return (word >> shift) | (word << (64 - shift)); |
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98 | } |
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99 | |||
100 | /** |
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1408 | serge | 101 | * rol32 - rotate a 32-bit value left |
102 | * @word: value to rotate |
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103 | * @shift: bits to roll |
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104 | */ |
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105 | static inline __u32 rol32(__u32 word, unsigned int shift) |
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106 | { |
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107 | return (word << shift) | (word >> (32 - shift)); |
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108 | } |
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109 | |||
110 | /** |
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111 | * ror32 - rotate a 32-bit value right |
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112 | * @word: value to rotate |
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113 | * @shift: bits to roll |
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114 | */ |
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115 | static inline __u32 ror32(__u32 word, unsigned int shift) |
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116 | { |
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117 | return (word >> shift) | (word << (32 - shift)); |
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118 | } |
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119 | |||
120 | /** |
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121 | * rol16 - rotate a 16-bit value left |
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122 | * @word: value to rotate |
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123 | * @shift: bits to roll |
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124 | */ |
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125 | static inline __u16 rol16(__u16 word, unsigned int shift) |
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126 | { |
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127 | return (word << shift) | (word >> (16 - shift)); |
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128 | } |
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129 | |||
130 | /** |
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131 | * ror16 - rotate a 16-bit value right |
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132 | * @word: value to rotate |
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133 | * @shift: bits to roll |
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134 | */ |
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135 | static inline __u16 ror16(__u16 word, unsigned int shift) |
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136 | { |
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137 | return (word >> shift) | (word << (16 - shift)); |
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138 | } |
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139 | |||
140 | /** |
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141 | * rol8 - rotate an 8-bit value left |
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142 | * @word: value to rotate |
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143 | * @shift: bits to roll |
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144 | */ |
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145 | static inline __u8 rol8(__u8 word, unsigned int shift) |
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146 | { |
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147 | return (word << shift) | (word >> (8 - shift)); |
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148 | } |
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149 | |||
150 | /** |
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151 | * ror8 - rotate an 8-bit value right |
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152 | * @word: value to rotate |
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153 | * @shift: bits to roll |
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154 | */ |
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155 | static inline __u8 ror8(__u8 word, unsigned int shift) |
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156 | { |
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157 | return (word >> shift) | (word << (8 - shift)); |
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158 | } |
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159 | |||
1970 | serge | 160 | /** |
161 | * sign_extend32 - sign extend a 32-bit value using specified bit as sign-bit |
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162 | * @value: value to sign extend |
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163 | * @index: 0 based bit index (0<=index<32) to sign bit |
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164 | */ |
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165 | static inline __s32 sign_extend32(__u32 value, int index) |
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166 | { |
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167 | __u8 shift = 31 - index; |
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168 | return (__s32)(value << shift) >> shift; |
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169 | } |
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170 | |||
1408 | serge | 171 | static inline unsigned fls_long(unsigned long l) |
172 | { |
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173 | if (sizeof(l) == 4) |
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174 | return fls(l); |
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175 | return fls64(l); |
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176 | } |
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177 | |||
178 | /** |
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179 | * __ffs64 - find first set bit in a 64 bit word |
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180 | * @word: The 64 bit word |
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181 | * |
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182 | * On 64 bit arches this is a synomyn for __ffs |
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183 | * The result is not defined if no bits are set, so check that @word |
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184 | * is non-zero before calling this. |
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185 | */ |
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186 | static inline unsigned long __ffs64(u64 word) |
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187 | { |
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188 | #if BITS_PER_LONG == 32 |
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189 | if (((u32)word) == 0UL) |
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190 | return __ffs((u32)(word >> 32)) + 32; |
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191 | #elif BITS_PER_LONG != 64 |
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192 | #error BITS_PER_LONG not 32 or 64 |
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193 | #endif |
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194 | return __ffs((unsigned long)word); |
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195 | } |
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196 | |||
197 | #ifdef __KERNEL__ |
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198 | |||
5056 | serge | 199 | #ifndef set_mask_bits |
200 | #define set_mask_bits(ptr, _mask, _bits) \ |
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201 | ({ \ |
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202 | const typeof(*ptr) mask = (_mask), bits = (_bits); \ |
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203 | typeof(*ptr) old, new; \ |
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204 | \ |
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205 | do { \ |
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206 | old = ACCESS_ONCE(*ptr); \ |
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207 | new = (old & ~mask) | bits; \ |
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208 | } while (cmpxchg(ptr, old, new) != old); \ |
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209 | \ |
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210 | new; \ |
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211 | }) |
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212 | #endif |
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213 | |||
1970 | serge | 214 | #ifndef find_last_bit |
1408 | serge | 215 | /** |
216 | * find_last_bit - find the last set bit in a memory region |
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217 | * @addr: The address to start the search at |
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218 | * @size: The maximum size to search |
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219 | * |
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220 | * Returns the bit number of the first set bit, or size. |
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221 | */ |
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222 | extern unsigned long find_last_bit(const unsigned long *addr, |
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223 | unsigned long size); |
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1970 | serge | 224 | #endif |
1408 | serge | 225 | |
226 | #endif /* __KERNEL__ */ |
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227 | #endif><>32)>=index<32)>><>><>><>><>><>><>><>><>>>>>><>><>><>><>><>><>><>><> |