Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _ASM_IA64_BITOPS_H |
| 2 | #define _ASM_IA64_BITOPS_H |
| 3 | |
| 4 | /* |
| 5 | * Copyright (C) 1998-2003 Hewlett-Packard Co |
| 6 | * David Mosberger-Tang <davidm@hpl.hp.com> |
| 7 | * |
Akinobu Mita | 2875aef | 2006-03-26 01:39:25 -0800 | [diff] [blame] | 8 | * 02/06/02 find_next_bit() and find_first_bit() added from Erich Focht's ia64 |
| 9 | * O(1) scheduler patch |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | */ |
| 11 | |
Jiri Slaby | 0624517 | 2007-10-18 23:40:26 -0700 | [diff] [blame] | 12 | #ifndef _LINUX_BITOPS_H |
| 13 | #error only <linux/bitops.h> can be included directly |
| 14 | #endif |
| 15 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/compiler.h> |
| 17 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <asm/intrinsics.h> |
| 19 | |
| 20 | /** |
| 21 | * set_bit - Atomically set a bit in memory |
| 22 | * @nr: the bit to set |
| 23 | * @addr: the address to start counting from |
| 24 | * |
| 25 | * This function is atomic and may not be reordered. See __set_bit() |
| 26 | * if you do not require the atomic guarantees. |
| 27 | * Note that @nr may be almost arbitrarily large; this function is not |
| 28 | * restricted to acting on a single-word quantity. |
| 29 | * |
| 30 | * The address must be (at least) "long" aligned. |
Akinobu Mita | 2875aef | 2006-03-26 01:39:25 -0800 | [diff] [blame] | 31 | * Note that there are driver (e.g., eepro100) which use these operations to |
| 32 | * operate on hw-defined data-structures, so we can't easily change these |
| 33 | * operations to force a bigger alignment. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | * |
| 35 | * bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1). |
| 36 | */ |
| 37 | static __inline__ void |
| 38 | set_bit (int nr, volatile void *addr) |
| 39 | { |
| 40 | __u32 bit, old, new; |
| 41 | volatile __u32 *m; |
| 42 | CMPXCHG_BUGCHECK_DECL |
| 43 | |
| 44 | m = (volatile __u32 *) addr + (nr >> 5); |
| 45 | bit = 1 << (nr & 31); |
| 46 | do { |
| 47 | CMPXCHG_BUGCHECK(m); |
| 48 | old = *m; |
| 49 | new = old | bit; |
| 50 | } while (cmpxchg_acq(m, old, new) != old); |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * __set_bit - Set a bit in memory |
| 55 | * @nr: the bit to set |
| 56 | * @addr: the address to start counting from |
| 57 | * |
| 58 | * Unlike set_bit(), this function is non-atomic and may be reordered. |
| 59 | * If it's called on the same region of memory simultaneously, the effect |
| 60 | * may be that only one operation succeeds. |
| 61 | */ |
| 62 | static __inline__ void |
| 63 | __set_bit (int nr, volatile void *addr) |
| 64 | { |
| 65 | *((__u32 *) addr + (nr >> 5)) |= (1 << (nr & 31)); |
| 66 | } |
| 67 | |
| 68 | /* |
| 69 | * clear_bit() has "acquire" semantics. |
| 70 | */ |
| 71 | #define smp_mb__before_clear_bit() smp_mb() |
| 72 | #define smp_mb__after_clear_bit() do { /* skip */; } while (0) |
| 73 | |
| 74 | /** |
| 75 | * clear_bit - Clears a bit in memory |
| 76 | * @nr: Bit to clear |
| 77 | * @addr: Address to start counting from |
| 78 | * |
| 79 | * clear_bit() is atomic and may not be reordered. However, it does |
| 80 | * not contain a memory barrier, so if it is used for locking purposes, |
| 81 | * you should call smp_mb__before_clear_bit() and/or smp_mb__after_clear_bit() |
| 82 | * in order to ensure changes are visible on other processors. |
| 83 | */ |
| 84 | static __inline__ void |
| 85 | clear_bit (int nr, volatile void *addr) |
| 86 | { |
| 87 | __u32 mask, old, new; |
| 88 | volatile __u32 *m; |
| 89 | CMPXCHG_BUGCHECK_DECL |
| 90 | |
| 91 | m = (volatile __u32 *) addr + (nr >> 5); |
| 92 | mask = ~(1 << (nr & 31)); |
| 93 | do { |
| 94 | CMPXCHG_BUGCHECK(m); |
| 95 | old = *m; |
| 96 | new = old & mask; |
| 97 | } while (cmpxchg_acq(m, old, new) != old); |
| 98 | } |
| 99 | |
| 100 | /** |
Nick Piggin | 87371e4 | 2007-10-18 03:06:52 -0700 | [diff] [blame] | 101 | * clear_bit_unlock - Clears a bit in memory with release |
| 102 | * @nr: Bit to clear |
| 103 | * @addr: Address to start counting from |
| 104 | * |
| 105 | * clear_bit_unlock() is atomic and may not be reordered. It does |
| 106 | * contain a memory barrier suitable for unlock type operations. |
| 107 | */ |
| 108 | static __inline__ void |
| 109 | clear_bit_unlock (int nr, volatile void *addr) |
| 110 | { |
| 111 | __u32 mask, old, new; |
| 112 | volatile __u32 *m; |
| 113 | CMPXCHG_BUGCHECK_DECL |
| 114 | |
| 115 | m = (volatile __u32 *) addr + (nr >> 5); |
| 116 | mask = ~(1 << (nr & 31)); |
| 117 | do { |
| 118 | CMPXCHG_BUGCHECK(m); |
| 119 | old = *m; |
| 120 | new = old & mask; |
| 121 | } while (cmpxchg_rel(m, old, new) != old); |
| 122 | } |
| 123 | |
| 124 | /** |
Zoltan Menyhart | 5302ac5 | 2008-02-04 15:19:16 -0800 | [diff] [blame] | 125 | * __clear_bit_unlock - Non-atomically clears a bit in memory with release |
| 126 | * @nr: Bit to clear |
| 127 | * @addr: Address to start counting from |
Nick Piggin | 87371e4 | 2007-10-18 03:06:52 -0700 | [diff] [blame] | 128 | * |
Zoltan Menyhart | 5302ac5 | 2008-02-04 15:19:16 -0800 | [diff] [blame] | 129 | * Similarly to clear_bit_unlock, the implementation uses a store |
Thomas Gleixner | 0199c4e | 2009-12-02 20:01:25 +0100 | [diff] [blame] | 130 | * with release semantics. See also arch_spin_unlock(). |
Nick Piggin | 87371e4 | 2007-10-18 03:06:52 -0700 | [diff] [blame] | 131 | */ |
Christoph Lameter | a3ebdb6 | 2007-12-18 16:22:46 -0800 | [diff] [blame] | 132 | static __inline__ void |
Zoltan Menyhart | 5302ac5 | 2008-02-04 15:19:16 -0800 | [diff] [blame] | 133 | __clear_bit_unlock(int nr, void *addr) |
Christoph Lameter | a3ebdb6 | 2007-12-18 16:22:46 -0800 | [diff] [blame] | 134 | { |
Zoltan Menyhart | 5302ac5 | 2008-02-04 15:19:16 -0800 | [diff] [blame] | 135 | __u32 * const m = (__u32 *) addr + (nr >> 5); |
| 136 | __u32 const new = *m & ~(1 << (nr & 31)); |
Christoph Lameter | a3ebdb6 | 2007-12-18 16:22:46 -0800 | [diff] [blame] | 137 | |
Christoph Lameter | a3ebdb6 | 2007-12-18 16:22:46 -0800 | [diff] [blame] | 138 | ia64_st4_rel_nta(m, new); |
| 139 | } |
Nick Piggin | 87371e4 | 2007-10-18 03:06:52 -0700 | [diff] [blame] | 140 | |
| 141 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | * __clear_bit - Clears a bit in memory (non-atomic version) |
Zoltan Menyhart | 5302ac5 | 2008-02-04 15:19:16 -0800 | [diff] [blame] | 143 | * @nr: the bit to clear |
| 144 | * @addr: the address to start counting from |
| 145 | * |
| 146 | * Unlike clear_bit(), this function is non-atomic and may be reordered. |
| 147 | * If it's called on the same region of memory simultaneously, the effect |
| 148 | * may be that only one operation succeeds. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | */ |
| 150 | static __inline__ void |
| 151 | __clear_bit (int nr, volatile void *addr) |
| 152 | { |
Zoltan Menyhart | 5302ac5 | 2008-02-04 15:19:16 -0800 | [diff] [blame] | 153 | *((__u32 *) addr + (nr >> 5)) &= ~(1 << (nr & 31)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | } |
| 155 | |
| 156 | /** |
| 157 | * change_bit - Toggle a bit in memory |
Zoltan Menyhart | 5302ac5 | 2008-02-04 15:19:16 -0800 | [diff] [blame] | 158 | * @nr: Bit to toggle |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | * @addr: Address to start counting from |
| 160 | * |
| 161 | * change_bit() is atomic and may not be reordered. |
| 162 | * Note that @nr may be almost arbitrarily large; this function is not |
| 163 | * restricted to acting on a single-word quantity. |
| 164 | */ |
| 165 | static __inline__ void |
| 166 | change_bit (int nr, volatile void *addr) |
| 167 | { |
| 168 | __u32 bit, old, new; |
| 169 | volatile __u32 *m; |
| 170 | CMPXCHG_BUGCHECK_DECL |
| 171 | |
| 172 | m = (volatile __u32 *) addr + (nr >> 5); |
| 173 | bit = (1 << (nr & 31)); |
| 174 | do { |
| 175 | CMPXCHG_BUGCHECK(m); |
| 176 | old = *m; |
| 177 | new = old ^ bit; |
| 178 | } while (cmpxchg_acq(m, old, new) != old); |
| 179 | } |
| 180 | |
| 181 | /** |
| 182 | * __change_bit - Toggle a bit in memory |
Zoltan Menyhart | 5302ac5 | 2008-02-04 15:19:16 -0800 | [diff] [blame] | 183 | * @nr: the bit to toggle |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | * @addr: the address to start counting from |
| 185 | * |
| 186 | * Unlike change_bit(), this function is non-atomic and may be reordered. |
| 187 | * If it's called on the same region of memory simultaneously, the effect |
| 188 | * may be that only one operation succeeds. |
| 189 | */ |
| 190 | static __inline__ void |
| 191 | __change_bit (int nr, volatile void *addr) |
| 192 | { |
| 193 | *((__u32 *) addr + (nr >> 5)) ^= (1 << (nr & 31)); |
| 194 | } |
| 195 | |
| 196 | /** |
| 197 | * test_and_set_bit - Set a bit and return its old value |
| 198 | * @nr: Bit to set |
| 199 | * @addr: Address to count from |
| 200 | * |
| 201 | * This operation is atomic and cannot be reordered. |
Zoltan Menyhart | 5302ac5 | 2008-02-04 15:19:16 -0800 | [diff] [blame] | 202 | * It also implies the acquisition side of the memory barrier. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | */ |
| 204 | static __inline__ int |
| 205 | test_and_set_bit (int nr, volatile void *addr) |
| 206 | { |
| 207 | __u32 bit, old, new; |
| 208 | volatile __u32 *m; |
| 209 | CMPXCHG_BUGCHECK_DECL |
| 210 | |
| 211 | m = (volatile __u32 *) addr + (nr >> 5); |
| 212 | bit = 1 << (nr & 31); |
| 213 | do { |
| 214 | CMPXCHG_BUGCHECK(m); |
| 215 | old = *m; |
| 216 | new = old | bit; |
| 217 | } while (cmpxchg_acq(m, old, new) != old); |
| 218 | return (old & bit) != 0; |
| 219 | } |
| 220 | |
| 221 | /** |
Nick Piggin | 87371e4 | 2007-10-18 03:06:52 -0700 | [diff] [blame] | 222 | * test_and_set_bit_lock - Set a bit and return its old value for lock |
| 223 | * @nr: Bit to set |
| 224 | * @addr: Address to count from |
| 225 | * |
| 226 | * This is the same as test_and_set_bit on ia64 |
| 227 | */ |
| 228 | #define test_and_set_bit_lock test_and_set_bit |
| 229 | |
| 230 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | * __test_and_set_bit - Set a bit and return its old value |
| 232 | * @nr: Bit to set |
| 233 | * @addr: Address to count from |
| 234 | * |
| 235 | * This operation is non-atomic and can be reordered. |
| 236 | * If two examples of this operation race, one can appear to succeed |
| 237 | * but actually fail. You must protect multiple accesses with a lock. |
| 238 | */ |
| 239 | static __inline__ int |
| 240 | __test_and_set_bit (int nr, volatile void *addr) |
| 241 | { |
| 242 | __u32 *p = (__u32 *) addr + (nr >> 5); |
| 243 | __u32 m = 1 << (nr & 31); |
| 244 | int oldbitset = (*p & m) != 0; |
| 245 | |
| 246 | *p |= m; |
| 247 | return oldbitset; |
| 248 | } |
| 249 | |
| 250 | /** |
| 251 | * test_and_clear_bit - Clear a bit and return its old value |
Zoltan Menyhart | 5302ac5 | 2008-02-04 15:19:16 -0800 | [diff] [blame] | 252 | * @nr: Bit to clear |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | * @addr: Address to count from |
| 254 | * |
| 255 | * This operation is atomic and cannot be reordered. |
Zoltan Menyhart | 5302ac5 | 2008-02-04 15:19:16 -0800 | [diff] [blame] | 256 | * It also implies the acquisition side of the memory barrier. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | */ |
| 258 | static __inline__ int |
| 259 | test_and_clear_bit (int nr, volatile void *addr) |
| 260 | { |
| 261 | __u32 mask, old, new; |
| 262 | volatile __u32 *m; |
| 263 | CMPXCHG_BUGCHECK_DECL |
| 264 | |
| 265 | m = (volatile __u32 *) addr + (nr >> 5); |
| 266 | mask = ~(1 << (nr & 31)); |
| 267 | do { |
| 268 | CMPXCHG_BUGCHECK(m); |
| 269 | old = *m; |
| 270 | new = old & mask; |
| 271 | } while (cmpxchg_acq(m, old, new) != old); |
| 272 | return (old & ~mask) != 0; |
| 273 | } |
| 274 | |
| 275 | /** |
| 276 | * __test_and_clear_bit - Clear a bit and return its old value |
Zoltan Menyhart | 5302ac5 | 2008-02-04 15:19:16 -0800 | [diff] [blame] | 277 | * @nr: Bit to clear |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | * @addr: Address to count from |
| 279 | * |
| 280 | * This operation is non-atomic and can be reordered. |
| 281 | * If two examples of this operation race, one can appear to succeed |
| 282 | * but actually fail. You must protect multiple accesses with a lock. |
| 283 | */ |
| 284 | static __inline__ int |
| 285 | __test_and_clear_bit(int nr, volatile void * addr) |
| 286 | { |
| 287 | __u32 *p = (__u32 *) addr + (nr >> 5); |
| 288 | __u32 m = 1 << (nr & 31); |
Johannes Weiner | 8d6f9af | 2009-08-11 14:52:10 -0700 | [diff] [blame] | 289 | int oldbitset = (*p & m) != 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | |
| 291 | *p &= ~m; |
| 292 | return oldbitset; |
| 293 | } |
| 294 | |
| 295 | /** |
| 296 | * test_and_change_bit - Change a bit and return its old value |
Zoltan Menyhart | 5302ac5 | 2008-02-04 15:19:16 -0800 | [diff] [blame] | 297 | * @nr: Bit to change |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | * @addr: Address to count from |
| 299 | * |
| 300 | * This operation is atomic and cannot be reordered. |
Zoltan Menyhart | 5302ac5 | 2008-02-04 15:19:16 -0800 | [diff] [blame] | 301 | * It also implies the acquisition side of the memory barrier. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | */ |
| 303 | static __inline__ int |
| 304 | test_and_change_bit (int nr, volatile void *addr) |
| 305 | { |
| 306 | __u32 bit, old, new; |
| 307 | volatile __u32 *m; |
| 308 | CMPXCHG_BUGCHECK_DECL |
| 309 | |
| 310 | m = (volatile __u32 *) addr + (nr >> 5); |
| 311 | bit = (1 << (nr & 31)); |
| 312 | do { |
| 313 | CMPXCHG_BUGCHECK(m); |
| 314 | old = *m; |
| 315 | new = old ^ bit; |
| 316 | } while (cmpxchg_acq(m, old, new) != old); |
| 317 | return (old & bit) != 0; |
| 318 | } |
| 319 | |
Zoltan Menyhart | 5302ac5 | 2008-02-04 15:19:16 -0800 | [diff] [blame] | 320 | /** |
| 321 | * __test_and_change_bit - Change a bit and return its old value |
| 322 | * @nr: Bit to change |
| 323 | * @addr: Address to count from |
| 324 | * |
| 325 | * This operation is non-atomic and can be reordered. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | */ |
| 327 | static __inline__ int |
| 328 | __test_and_change_bit (int nr, void *addr) |
| 329 | { |
| 330 | __u32 old, bit = (1 << (nr & 31)); |
| 331 | __u32 *m = (__u32 *) addr + (nr >> 5); |
| 332 | |
| 333 | old = *m; |
| 334 | *m = old ^ bit; |
| 335 | return (old & bit) != 0; |
| 336 | } |
| 337 | |
| 338 | static __inline__ int |
| 339 | test_bit (int nr, const volatile void *addr) |
| 340 | { |
| 341 | return 1 & (((const volatile __u32 *) addr)[nr >> 5] >> (nr & 31)); |
| 342 | } |
| 343 | |
| 344 | /** |
| 345 | * ffz - find the first zero bit in a long word |
| 346 | * @x: The long word to find the bit in |
| 347 | * |
Akinobu Mita | 2875aef | 2006-03-26 01:39:25 -0800 | [diff] [blame] | 348 | * Returns the bit-number (0..63) of the first (least significant) zero bit. |
| 349 | * Undefined if no zero exists, so code should check against ~0UL first... |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | */ |
| 351 | static inline unsigned long |
| 352 | ffz (unsigned long x) |
| 353 | { |
| 354 | unsigned long result; |
| 355 | |
| 356 | result = ia64_popcnt(x & (~x - 1)); |
| 357 | return result; |
| 358 | } |
| 359 | |
| 360 | /** |
| 361 | * __ffs - find first bit in word. |
| 362 | * @x: The word to search |
| 363 | * |
| 364 | * Undefined if no bit exists, so code should check against 0 first. |
| 365 | */ |
| 366 | static __inline__ unsigned long |
| 367 | __ffs (unsigned long x) |
| 368 | { |
| 369 | unsigned long result; |
| 370 | |
| 371 | result = ia64_popcnt((x-1) & ~x); |
| 372 | return result; |
| 373 | } |
| 374 | |
| 375 | #ifdef __KERNEL__ |
| 376 | |
| 377 | /* |
David Mosberger-Tang | 821376b | 2005-04-21 11:07:59 -0700 | [diff] [blame] | 378 | * Return bit number of last (most-significant) bit set. Undefined |
| 379 | * for x==0. Bits are numbered from 0..63 (e.g., ia64_fls(9) == 3). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | */ |
| 381 | static inline unsigned long |
| 382 | ia64_fls (unsigned long x) |
| 383 | { |
| 384 | long double d = x; |
| 385 | long exp; |
| 386 | |
| 387 | exp = ia64_getf_exp(d); |
| 388 | return exp - 0xffff; |
| 389 | } |
| 390 | |
David Mosberger-Tang | 821376b | 2005-04-21 11:07:59 -0700 | [diff] [blame] | 391 | /* |
| 392 | * Find the last (most significant) bit set. Returns 0 for x==0 and |
| 393 | * bits are numbered from 1..32 (e.g., fls(9) == 4). |
| 394 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | static inline int |
David Mosberger-Tang | 821376b | 2005-04-21 11:07:59 -0700 | [diff] [blame] | 396 | fls (int t) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | { |
David Mosberger-Tang | 821376b | 2005-04-21 11:07:59 -0700 | [diff] [blame] | 398 | unsigned long x = t & 0xffffffffu; |
| 399 | |
| 400 | if (!x) |
| 401 | return 0; |
| 402 | x |= x >> 1; |
| 403 | x |= x >> 2; |
| 404 | x |= x >> 4; |
| 405 | x |= x >> 8; |
| 406 | x |= x >> 16; |
| 407 | return ia64_popcnt(x); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | } |
Akinobu Mita | 2875aef | 2006-03-26 01:39:25 -0800 | [diff] [blame] | 409 | |
Alexander van Heukelum | 56a6b1e | 2008-03-15 18:31:49 +0100 | [diff] [blame] | 410 | /* |
| 411 | * Find the last (most significant) bit set. Undefined for x==0. |
| 412 | * Bits are numbered from 0..63 (e.g., __fls(9) == 3). |
| 413 | */ |
| 414 | static inline unsigned long |
| 415 | __fls (unsigned long x) |
| 416 | { |
| 417 | x |= x >> 1; |
| 418 | x |= x >> 2; |
| 419 | x |= x >> 4; |
| 420 | x |= x >> 8; |
| 421 | x |= x >> 16; |
| 422 | x |= x >> 32; |
| 423 | return ia64_popcnt(x) - 1; |
| 424 | } |
| 425 | |
Akinobu Mita | 2875aef | 2006-03-26 01:39:25 -0800 | [diff] [blame] | 426 | #include <asm-generic/bitops/fls64.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | |
| 428 | /* |
Akinobu Mita | 2875aef | 2006-03-26 01:39:25 -0800 | [diff] [blame] | 429 | * ffs: find first bit set. This is defined the same way as the libc and |
| 430 | * compiler builtin ffs routines, therefore differs in spirit from the above |
| 431 | * ffz (man ffs): it operates on "int" values only and the result value is the |
| 432 | * bit number + 1. ffs(0) is defined to return zero. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | */ |
| 434 | #define ffs(x) __builtin_ffs(x) |
| 435 | |
| 436 | /* |
| 437 | * hweightN: returns the hamming weight (i.e. the number |
| 438 | * of bits set) of a N-bit word |
| 439 | */ |
Peter Zijlstra | 1527bc8 | 2010-02-01 15:03:07 +0100 | [diff] [blame] | 440 | static __inline__ unsigned long __arch_hweight64(unsigned long x) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | { |
| 442 | unsigned long result; |
| 443 | result = ia64_popcnt(x); |
| 444 | return result; |
| 445 | } |
| 446 | |
Peter Zijlstra | 1527bc8 | 2010-02-01 15:03:07 +0100 | [diff] [blame] | 447 | #define __arch_hweight32(x) ((unsigned int) __arch_hweight64((x) & 0xfffffffful)) |
| 448 | #define __arch_hweight16(x) ((unsigned int) __arch_hweight64((x) & 0xfffful)) |
| 449 | #define __arch_hweight8(x) ((unsigned int) __arch_hweight64((x) & 0xfful)) |
| 450 | |
| 451 | #include <asm-generic/bitops/const_hweight.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | |
| 453 | #endif /* __KERNEL__ */ |
| 454 | |
Akinobu Mita | 2875aef | 2006-03-26 01:39:25 -0800 | [diff] [blame] | 455 | #include <asm-generic/bitops/find.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | |
| 457 | #ifdef __KERNEL__ |
| 458 | |
Akinobu Mita | 861b5ae | 2011-03-23 16:42:02 -0700 | [diff] [blame] | 459 | #include <asm-generic/bitops/le.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | #define ext2_set_bit_atomic(l,n,a) test_and_set_bit(n,a) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | #define ext2_clear_bit_atomic(l,n,a) test_and_clear_bit(n,a) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | |
Akinobu Mita | 2875aef | 2006-03-26 01:39:25 -0800 | [diff] [blame] | 464 | #include <asm-generic/bitops/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | |
| 466 | #endif /* __KERNEL__ */ |
| 467 | |
| 468 | #endif /* _ASM_IA64_BITOPS_H */ |