include/asm-m68k/bitops.h

   1 #ifndef _M68K_BITOPS_H
   2 #define _M68K_BITOPS_H
   3 /*
   4  * Copyright 1992, Linus Torvalds.
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file COPYING in the main directory of this archive
   8  * for more details.
   9  */
  10
  11 #ifndef _LINUX_BITOPS_H
  12 #error only <linux/bitops.h> can be included directly
  13 #endif
  14
  15 #include <linux/compiler.h>
  16
  17 /*
  18  * Require 68020 or better.
  19  *
  20  * They use the standard big-endian m680x0 bit ordering.
  21  */
  22
  23 #define test_and_set_bit(nr,vaddr) \
  24   (__builtin_constant_p(nr) ? \
  25    __constant_test_and_set_bit(nr, vaddr) : \
  26    __generic_test_and_set_bit(nr, vaddr))
  27
  28 #define __test_and_set_bit(nr,vaddr) test_and_set_bit(nr,vaddr)
  29
  30 static inline int __constant_test_and_set_bit(int nr, unsigned long *vaddr)
  31 {
  32         char *p = (char *)vaddr + (nr ^ 31) / 8;
  33         char retval;
  34
  35         __asm__ __volatile__ ("bset %2,%1; sne %0"
  36                         : "=d" (retval), "+m" (*p)
  37                         : "di" (nr & 7));
  38
  39         return retval;
  40 }
  41
  42 static inline int __generic_test_and_set_bit(int nr, unsigned long *vaddr)
  43 {
  44         char retval;
  45
  46         __asm__ __volatile__ ("bfset %2{%1:#1}; sne %0"
  47                         : "=d" (retval) : "d" (nr^31), "o" (*vaddr) : "memory");
  48
  49         return retval;
  50 }
  51
  52 #define set_bit(nr,vaddr) \
  53   (__builtin_constant_p(nr) ? \
  54    __constant_set_bit(nr, vaddr) : \
  55    __generic_set_bit(nr, vaddr))
  56
  57 #define __set_bit(nr,vaddr) set_bit(nr,vaddr)
  58
  59 static inline void __constant_set_bit(int nr, volatile unsigned long *vaddr)
  60 {
  61         char *p = (char *)vaddr + (nr ^ 31) / 8;
  62         __asm__ __volatile__ ("bset %1,%0"
  63                         : "+m" (*p) : "di" (nr & 7));
  64 }
  65
  66 static inline void __generic_set_bit(int nr, volatile unsigned long *vaddr)
  67 {
  68         __asm__ __volatile__ ("bfset %1{%0:#1}"
  69                         : : "d" (nr^31), "o" (*vaddr) : "memory");
  70 }
  71
  72 #define test_and_clear_bit(nr,vaddr) \
  73   (__builtin_constant_p(nr) ? \
  74    __constant_test_and_clear_bit(nr, vaddr) : \
  75    __generic_test_and_clear_bit(nr, vaddr))
  76
  77 #define __test_and_clear_bit(nr,vaddr) test_and_clear_bit(nr,vaddr)
  78
  79 static inline int __constant_test_and_clear_bit(int nr, unsigned long *vaddr)
  80 {
  81         char *p = (char *)vaddr + (nr ^ 31) / 8;
  82         char retval;
  83
  84         __asm__ __volatile__ ("bclr %2,%1; sne %0"
  85                         : "=d" (retval), "+m" (*p)
  86                         : "di" (nr & 7));
  87
  88         return retval;
  89 }
  90
  91 static inline int __generic_test_and_clear_bit(int nr, unsigned long *vaddr)
  92 {
  93         char retval;
  94
  95         __asm__ __volatile__ ("bfclr %2{%1:#1}; sne %0"
  96                         : "=d" (retval) : "d" (nr^31), "o" (*vaddr) : "memory");
  97
  98         return retval;
  99 }
 100
 101 /*
 102  * clear_bit() doesn't provide any barrier for the compiler.
 103  */
 104 #define smp_mb__before_clear_bit()      barrier()
 105 #define smp_mb__after_clear_bit()       barrier()
 106
 107 #define clear_bit(nr,vaddr) \
 108   (__builtin_constant_p(nr) ? \
 109    __constant_clear_bit(nr, vaddr) : \
 110    __generic_clear_bit(nr, vaddr))
 111 #define __clear_bit(nr,vaddr) clear_bit(nr,vaddr)
 112
 113 static inline void __constant_clear_bit(int nr, volatile unsigned long *vaddr)
 114 {
 115         char *p = (char *)vaddr + (nr ^ 31) / 8;
 116         __asm__ __volatile__ ("bclr %1,%0"
 117                         : "+m" (*p) : "di" (nr & 7));
 118 }
 119
 120 static inline void __generic_clear_bit(int nr, volatile unsigned long *vaddr)
 121 {
 122         __asm__ __volatile__ ("bfclr %1{%0:#1}"
 123                         : : "d" (nr^31), "o" (*vaddr) : "memory");
 124 }
 125
 126 #define test_and_change_bit(nr,vaddr) \
 127   (__builtin_constant_p(nr) ? \
 128    __constant_test_and_change_bit(nr, vaddr) : \
 129    __generic_test_and_change_bit(nr, vaddr))
 130
 131 #define __test_and_change_bit(nr,vaddr) test_and_change_bit(nr,vaddr)
 132 #define __change_bit(nr,vaddr) change_bit(nr,vaddr)
 133
 134 static inline int __constant_test_and_change_bit(int nr, unsigned long *vaddr)
 135 {
 136         char *p = (char *)vaddr + (nr ^ 31) / 8;
 137         char retval;
 138
 139         __asm__ __volatile__ ("bchg %2,%1; sne %0"
 140                         : "=d" (retval), "+m" (*p)
 141                         : "di" (nr & 7));
 142
 143         return retval;
 144 }
 145
 146 static inline int __generic_test_and_change_bit(int nr, unsigned long *vaddr)
 147 {
 148         char retval;
 149
 150         __asm__ __volatile__ ("bfchg %2{%1:#1}; sne %0"
 151                         : "=d" (retval) : "d" (nr^31), "o" (*vaddr) : "memory");
 152
 153         return retval;
 154 }
 155
 156 #define change_bit(nr,vaddr) \
 157   (__builtin_constant_p(nr) ? \
 158    __constant_change_bit(nr, vaddr) : \
 159    __generic_change_bit(nr, vaddr))
 160
 161 static inline void __constant_change_bit(int nr, unsigned long *vaddr)
 162 {
 163         char *p = (char *)vaddr + (nr ^ 31) / 8;
 164         __asm__ __volatile__ ("bchg %1,%0"
 165                         : "+m" (*p) : "di" (nr & 7));
 166 }
 167
 168 static inline void __generic_change_bit(int nr, unsigned long *vaddr)
 169 {
 170         __asm__ __volatile__ ("bfchg %1{%0:#1}"
 171                         : : "d" (nr^31), "o" (*vaddr) : "memory");
 172 }
 173
 174 static inline int test_bit(int nr, const unsigned long *vaddr)
 175 {
 176         return (vaddr[nr >> 5] & (1UL << (nr & 31))) != 0;
 177 }
 178
 179 static inline int find_first_zero_bit(const unsigned long *vaddr,
 180                                       unsigned size)
 181 {
 182         const unsigned long *p = vaddr;
 183         int res = 32;
 184         unsigned long num;
 185
 186         if (!size)
 187                 return 0;
 188
 189         size = (size + 31) >> 5;
 190         while (!(num = ~*p++)) {
 191                 if (!--size)
 192                         goto out;
 193         }
 194
 195         __asm__ __volatile__ ("bfffo %1{#0,#0},%0"
 196                               : "=d" (res) : "d" (num & -num));
 197         res ^= 31;
 198 out:
 199         return ((long)p - (long)vaddr - 4) * 8 + res;
 200 }
 201
 202 static inline int find_next_zero_bit(const unsigned long *vaddr, int size,
 203                                      int offset)
 204 {
 205         const unsigned long *p = vaddr + (offset >> 5);
 206         int bit = offset & 31UL, res;
 207
 208         if (offset >= size)
 209                 return size;
 210
 211         if (bit) {
 212                 unsigned long num = ~*p++ & (~0UL << bit);
 213                 offset -= bit;
 214
 215                 /* Look for zero in first longword */
 216                 __asm__ __volatile__ ("bfffo %1{#0,#0},%0"
 217                                       : "=d" (res) : "d" (num & -num));
 218                 if (res < 32)
 219                         return offset + (res ^ 31);
 220                 offset += 32;
 221         }
 222         /* No zero yet, search remaining full bytes for a zero */
 223         res = find_first_zero_bit(p, size - ((long)p - (long)vaddr) * 8);
 224         return offset + res;
 225 }
 226
 227 static inline int find_first_bit(const unsigned long *vaddr, unsigned size)
 228 {
 229         const unsigned long *p = vaddr;
 230         int res = 32;
 231         unsigned long num;
 232
 233         if (!size)
 234                 return 0;
 235
 236         size = (size + 31) >> 5;
 237         while (!(num = *p++)) {
 238                 if (!--size)
 239                         goto out;
 240         }
 241
 242         __asm__ __volatile__ ("bfffo %1{#0,#0},%0"
 243                               : "=d" (res) : "d" (num & -num));
 244         res ^= 31;
 245 out:
 246         return ((long)p - (long)vaddr - 4) * 8 + res;
 247 }
 248
 249 static inline int find_next_bit(const unsigned long *vaddr, int size,
 250                                 int offset)
 251 {
 252         const unsigned long *p = vaddr + (offset >> 5);
 253         int bit = offset & 31UL, res;
 254
 255         if (offset >= size)
 256                 return size;
 257
 258         if (bit) {
 259                 unsigned long num = *p++ & (~0UL << bit);
 260                 offset -= bit;
 261
 262                 /* Look for one in first longword */
 263                 __asm__ __volatile__ ("bfffo %1{#0,#0},%0"
 264                                       : "=d" (res) : "d" (num & -num));
 265                 if (res < 32)
 266                         return offset + (res ^ 31);
 267                 offset += 32;
 268         }
 269         /* No one yet, search remaining full bytes for a one */
 270         res = find_first_bit(p, size - ((long)p - (long)vaddr) * 8);
 271         return offset + res;
 272 }
 273
 274 /*
 275  * ffz = Find First Zero in word. Undefined if no zero exists,
 276  * so code should check against ~0UL first..
 277  */
 278 static inline unsigned long ffz(unsigned long word)
 279 {
 280         int res;
 281
 282         __asm__ __volatile__ ("bfffo %1{#0,#0},%0"
 283                               : "=d" (res) : "d" (~word & -~word));
 284         return res ^ 31;
 285 }
 286
 287 #ifdef __KERNEL__
 288
 289 /*
 290  * ffs: find first bit set. This is defined the same way as
 291  * the libc and compiler builtin ffs routines, therefore
 292  * differs in spirit from the above ffz (man ffs).
 293  */
 294
 295 static inline int ffs(int x)
 296 {
 297         int cnt;
 298
 299         asm ("bfffo %1{#0:#0},%0" : "=d" (cnt) : "dm" (x & -x));
 300
 301         return 32 - cnt;
 302 }
 303 #define __ffs(x) (ffs(x) - 1)
 304
 305 /*
 306  * fls: find last bit set.
 307  */
 308
 309 static inline int fls(int x)
 310 {
 311         int cnt;
 312
 313         asm ("bfffo %1{#0,#0},%0" : "=d" (cnt) : "dm" (x));
 314
 315         return 32 - cnt;
 316 }
 317
 318 #include <asm-generic/bitops/fls64.h>
 319 #include <asm-generic/bitops/sched.h>
 320 #include <asm-generic/bitops/hweight.h>
 321 #include <asm-generic/bitops/lock.h>
 322
 323 /* Bitmap functions for the minix filesystem */
 324
 325 static inline int minix_find_first_zero_bit(const void *vaddr, unsigned size)
 326 {
 327         const unsigned short *p = vaddr, *addr = vaddr;
 328         int res;
 329         unsigned short num;
 330
 331         if (!size)
 332                 return 0;
 333
 334         size = (size >> 4) + ((size & 15) > 0);
 335         while (*p++ == 0xffff)
 336         {
 337                 if (--size == 0)
 338                         return (p - addr) << 4;
 339         }
 340
 341         num = ~*--p;
 342         __asm__ __volatile__ ("bfffo %1{#16,#16},%0"
 343                               : "=d" (res) : "d" (num & -num));
 344         return ((p - addr) << 4) + (res ^ 31);
 345 }
 346
 347 #define minix_test_and_set_bit(nr, addr)        __test_and_set_bit((nr) ^ 16, (unsigned long *)(addr))
 348 #define minix_set_bit(nr,addr)                  __set_bit((nr) ^ 16, (unsigned long *)(addr))
 349 #define minix_test_and_clear_bit(nr, addr)      __test_and_clear_bit((nr) ^ 16, (unsigned long *)(addr))
 350
 351 static inline int minix_test_bit(int nr, const void *vaddr)
 352 {
 353         const unsigned short *p = vaddr;
 354         return (p[nr >> 4] & (1U << (nr & 15))) != 0;
 355 }
 356
 357 /* Bitmap functions for the ext2 filesystem. */
 358
 359 #define ext2_set_bit(nr, addr)                  __test_and_set_bit((nr) ^ 24, (unsigned long *)(addr))
 360 #define ext2_set_bit_atomic(lock, nr, addr)     test_and_set_bit((nr) ^ 24, (unsigned long *)(addr))
 361 #define ext2_clear_bit(nr, addr)                __test_and_clear_bit((nr) ^ 24, (unsigned long *)(addr))
 362 #define ext2_clear_bit_atomic(lock, nr, addr)   test_and_clear_bit((nr) ^ 24, (unsigned long *)(addr))
 363
 364 static inline int ext2_test_bit(int nr, const void *vaddr)
 365 {
 366         const unsigned char *p = vaddr;
 367         return (p[nr >> 3] & (1U << (nr & 7))) != 0;
 368 }
 369
 370 static inline int ext2_find_first_zero_bit(const void *vaddr, unsigned size)
 371 {
 372         const unsigned long *p = vaddr, *addr = vaddr;
 373         int res;
 374
 375         if (!size)
 376                 return 0;
 377
 378         size = (size >> 5) + ((size & 31) > 0);
 379         while (*p++ == ~0UL)
 380         {
 381                 if (--size == 0)
 382                         return (p - addr) << 5;
 383         }
 384
 385         --p;
 386         for (res = 0; res < 32; res++)
 387                 if (!ext2_test_bit (res, p))
 388                         break;
 389         return (p - addr) * 32 + res;
 390 }
 391
 392 static inline int ext2_find_next_zero_bit(const void *vaddr, unsigned size,
 393                                           unsigned offset)
 394 {
 395         const unsigned long *addr = vaddr;
 396         const unsigned long *p = addr + (offset >> 5);
 397         int bit = offset & 31UL, res;
 398
 399         if (offset >= size)
 400                 return size;
 401
 402         if (bit) {
 403                 /* Look for zero in first longword */
 404                 for (res = bit; res < 32; res++)
 405                         if (!ext2_test_bit (res, p))
 406                                 return (p - addr) * 32 + res;
 407                 p++;
 408         }
 409         /* No zero yet, search remaining full bytes for a zero */
 410         res = ext2_find_first_zero_bit (p, size - 32 * (p - addr));
 411         return (p - addr) * 32 + res;
 412 }
 413
 414 #endif /* __KERNEL__ */
 415
 416 #endif /* _M68K_BITOPS_H */