include/asm-h8300/bitops.h

   1 #ifndef _H8300_BITOPS_H
   2 #define _H8300_BITOPS_H
   3
   4 /*
   5  * Copyright 1992, Linus Torvalds.
   6  * Copyright 2002, Yoshinori Sato
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/config.h>
  11 #include <linux/compiler.h>
  12 #include <asm/byteorder.h>      /* swab32 */
  13 #include <asm/system.h>
  14
  15 #ifdef __KERNEL__
  16 /*
  17  * Function prototypes to keep gcc -Wall happy
  18  */
  19
  20 /*
  21  * ffz = Find First Zero in word. Undefined if no zero exists,
  22  * so code should check against ~0UL first..
  23  */
  24 static __inline__ unsigned long ffz(unsigned long word)
  25 {
  26         unsigned long result;
  27
  28         result = -1;
  29         __asm__("1:\n\t"
  30                 "shlr.l %2\n\t"
  31                 "adds #1,%0\n\t"
  32                 "bcs 1b"
  33                 : "=r" (result)
  34                 : "0"  (result),"r" (word));
  35         return result;
  36 }
  37
  38 #define H8300_GEN_BITOP_CONST(OP,BIT)                       \
  39         case BIT:                                           \
  40         __asm__(OP " #" #BIT ",@%0"::"r"(b_addr):"memory"); \
  41         break;
  42
  43 #define H8300_GEN_BITOP(FNAME,OP)                                     \
  44 static __inline__ void FNAME(int nr, volatile unsigned long* addr)    \
  45 {                                                                     \
  46         volatile unsigned char *b_addr;                               \
  47         b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3);    \
  48         if (__builtin_constant_p(nr)) {                               \
  49                 switch(nr & 7) {                                      \
  50                         H8300_GEN_BITOP_CONST(OP,0)                   \
  51                         H8300_GEN_BITOP_CONST(OP,1)                   \
  52                         H8300_GEN_BITOP_CONST(OP,2)                   \
  53                         H8300_GEN_BITOP_CONST(OP,3)                   \
  54                         H8300_GEN_BITOP_CONST(OP,4)                   \
  55                         H8300_GEN_BITOP_CONST(OP,5)                   \
  56                         H8300_GEN_BITOP_CONST(OP,6)                   \
  57                         H8300_GEN_BITOP_CONST(OP,7)                   \
  58                 }                                                     \
  59         } else {                                                      \
  60                 __asm__(OP " %w0,@%1"::"r"(nr),"r"(b_addr):"memory"); \
  61         }                                                             \
  62 }
  63
  64 /*
  65  * clear_bit() doesn't provide any barrier for the compiler.
  66  */
  67 #define smp_mb__before_clear_bit()      barrier()
  68 #define smp_mb__after_clear_bit()       barrier()
  69
  70 H8300_GEN_BITOP(set_bit   ,"bset")
  71 H8300_GEN_BITOP(clear_bit ,"bclr")
  72 H8300_GEN_BITOP(change_bit,"bnot")
  73 #define __set_bit(nr,addr)    set_bit((nr),(addr))
  74 #define __clear_bit(nr,addr)  clear_bit((nr),(addr))
  75 #define __change_bit(nr,addr) change_bit((nr),(addr))
  76
  77 #undef H8300_GEN_BITOP
  78 #undef H8300_GEN_BITOP_CONST
  79
  80 static __inline__ int test_bit(int nr, const unsigned long* addr)
  81 {
  82         return (*((volatile unsigned char *)addr +
  83                ((nr >> 3) ^ 3)) & (1UL << (nr & 7))) != 0;
  84 }
  85
  86 #define __test_bit(nr, addr) test_bit(nr, addr)
  87
  88 #define H8300_GEN_TEST_BITOP_CONST_INT(OP,BIT)                       \
  89         case BIT:                                                    \
  90         __asm__("stc ccr,%w1\n\t"                                    \
  91                 "orc #0x80,ccr\n\t"                                  \
  92                 "bld #" #BIT ",@%4\n\t"                              \
  93                 OP " #" #BIT ",@%4\n\t"                              \
  94                 "rotxl.l %0\n\t"                                     \
  95                 "ldc %w1,ccr"                                        \
  96                 : "=r"(retval),"=&r"(ccrsave),"=m"(*b_addr)          \
  97                 : "0" (retval),"r" (b_addr)                          \
  98                 : "memory");                                         \
  99         break;
 100
 101 #define H8300_GEN_TEST_BITOP_CONST(OP,BIT)                           \
 102         case BIT:                                                    \
 103         __asm__("bld #" #BIT ",@%3\n\t"                              \
 104                 OP " #" #BIT ",@%3\n\t"                              \
 105                 "rotxl.l %0\n\t"                                     \
 106                 : "=r"(retval),"=m"(*b_addr)                         \
 107                 : "0" (retval),"r" (b_addr)                          \
 108                 : "memory");                                         \
 109         break;
 110
 111 #define H8300_GEN_TEST_BITOP(FNNAME,OP)                              \
 112 static __inline__ int FNNAME(int nr, volatile void * addr)           \
 113 {                                                                    \
 114         int retval = 0;                                              \
 115         char ccrsave;                                                \
 116         volatile unsigned char *b_addr;                              \
 117         b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3);   \
 118         if (__builtin_constant_p(nr)) {                              \
 119                 switch(nr & 7) {                                     \
 120                         H8300_GEN_TEST_BITOP_CONST_INT(OP,0)         \
 121                         H8300_GEN_TEST_BITOP_CONST_INT(OP,1)         \
 122                         H8300_GEN_TEST_BITOP_CONST_INT(OP,2)         \
 123                         H8300_GEN_TEST_BITOP_CONST_INT(OP,3)         \
 124                         H8300_GEN_TEST_BITOP_CONST_INT(OP,4)         \
 125                         H8300_GEN_TEST_BITOP_CONST_INT(OP,5)         \
 126                         H8300_GEN_TEST_BITOP_CONST_INT(OP,6)         \
 127                         H8300_GEN_TEST_BITOP_CONST_INT(OP,7)         \
 128                 }                                                    \
 129         } else {                                                     \
 130                 __asm__("stc ccr,%w1\n\t"                            \
 131                         "orc #0x80,ccr\n\t"                          \
 132                         "btst %w5,@%4\n\t"                           \
 133                         OP " %w5,@%4\n\t"                            \
 134                         "beq 1f\n\t"                                 \
 135                         "inc.l #1,%0\n"                              \
 136                         "1:\n\t"                                     \
 137                         "ldc %w1,ccr"                                \
 138                         : "=r"(retval),"=&r"(ccrsave),"=m"(*b_addr)  \
 139                         : "0" (retval),"r" (b_addr),"r"(nr)          \
 140                         : "memory");                                 \
 141         }                                                            \
 142         return retval;                                               \
 143 }                                                                    \
 144                                                                      \
 145 static __inline__ int __ ## FNNAME(int nr, volatile void * addr)     \
 146 {                                                                    \
 147         int retval = 0;                                              \
 148         volatile unsigned char *b_addr;                              \
 149         b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3);   \
 150         if (__builtin_constant_p(nr)) {                              \
 151                 switch(nr & 7) {                                     \
 152                         H8300_GEN_TEST_BITOP_CONST(OP,0)             \
 153                         H8300_GEN_TEST_BITOP_CONST(OP,1)             \
 154                         H8300_GEN_TEST_BITOP_CONST(OP,2)             \
 155                         H8300_GEN_TEST_BITOP_CONST(OP,3)             \
 156                         H8300_GEN_TEST_BITOP_CONST(OP,4)             \
 157                         H8300_GEN_TEST_BITOP_CONST(OP,5)             \
 158                         H8300_GEN_TEST_BITOP_CONST(OP,6)             \
 159                         H8300_GEN_TEST_BITOP_CONST(OP,7)             \
 160                 }                                                    \
 161         } else {                                                     \
 162                 __asm__("btst %w4,@%3\n\t"                           \
 163                         OP " %w4,@%3\n\t"                            \
 164                         "beq 1f\n\t"                                 \
 165                         "inc.l #1,%0\n"                              \
 166                         "1:"                                         \
 167                         : "=r"(retval),"=m"(*b_addr)                 \
 168                         : "0" (retval),"r" (b_addr),"r"(nr)          \
 169                         : "memory");                                 \
 170         }                                                            \
 171         return retval;                                               \
 172 }
 173
 174 H8300_GEN_TEST_BITOP(test_and_set_bit,   "bset")
 175 H8300_GEN_TEST_BITOP(test_and_clear_bit, "bclr")
 176 H8300_GEN_TEST_BITOP(test_and_change_bit,"bnot")
 177 #undef H8300_GEN_TEST_BITOP_CONST
 178 #undef H8300_GEN_TEST_BITOP_CONST_INT
 179 #undef H8300_GEN_TEST_BITOP
 180
 181 #define find_first_zero_bit(addr, size) \
 182         find_next_zero_bit((addr), (size), 0)
 183
 184 static __inline__ unsigned long __ffs(unsigned long word)
 185 {
 186         unsigned long result;
 187
 188         result = -1;
 189         __asm__("1:\n\t"
 190                 "shlr.l %2\n\t"
 191                 "adds #1,%0\n\t"
 192                 "bcc 1b"
 193                 : "=r" (result)
 194                 : "0"(result),"r"(word));
 195         return result;
 196 }
 197
 198 #define ffs(x) generic_ffs(x)
 199 #define fls(x) generic_fls(x)
 200
 201 static __inline__ int find_next_zero_bit (void * addr, int size, int offset)
 202 {
 203         unsigned long *p = (unsigned long *)(((unsigned long)addr + (offset >> 3)) & ~3);
 204         unsigned long result = offset & ~31UL;
 205         unsigned long tmp;
 206
 207         if (offset >= size)
 208                 return size;
 209         size -= result;
 210         offset &= 31UL;
 211         if (offset) {
 212                 tmp = *(p++);
 213                 tmp |= ~0UL >> (32-offset);
 214                 if (size < 32)
 215                         goto found_first;
 216                 if (~tmp)
 217                         goto found_middle;
 218                 size -= 32;
 219                 result += 32;
 220         }
 221         while (size & ~31UL) {
 222                 if (~(tmp = *(p++)))
 223                         goto found_middle;
 224                 result += 32;
 225                 size -= 32;
 226         }
 227         if (!size)
 228                 return result;
 229         tmp = *p;
 230
 231 found_first:
 232         tmp |= ~0UL >> size;
 233 found_middle:
 234         return result + ffz(tmp);
 235 }
 236
 237 static __inline__ unsigned long find_next_bit(const unsigned long *addr,
 238         unsigned long size, unsigned long offset)
 239 {
 240         unsigned long *p = (unsigned long *)(((unsigned long)addr + (offset >> 3)) & ~3);
 241         unsigned int result = offset & ~31UL;
 242         unsigned int tmp;
 243
 244         if (offset >= size)
 245                 return size;
 246         size -= result;
 247         offset &= 31UL;
 248         if (offset) {
 249                 tmp = *(p++);
 250                 tmp &= ~0UL << offset;
 251                 if (size < 32)
 252                         goto found_first;
 253                 if (tmp)
 254                         goto found_middle;
 255                 size -= 32;
 256                 result += 32;
 257         }
 258         while (size >= 32) {
 259                 if ((tmp = *p++) != 0)
 260                         goto found_middle;
 261                 result += 32;
 262                 size -= 32;
 263         }
 264         if (!size)
 265                 return result;
 266         tmp = *p;
 267
 268 found_first:
 269         tmp &= ~0UL >> (32 - size);
 270         if (tmp == 0UL)
 271                 return result + size;
 272 found_middle:
 273         return result + __ffs(tmp);
 274 }
 275
 276 /*
 277  * Every architecture must define this function. It's the fastest
 278  * way of searching a 140-bit bitmap where the first 100 bits are
 279  * unlikely to be set. It's guaranteed that at least one of the 140
 280  * bits is cleared.
 281  */
 282 static inline int sched_find_first_bit(unsigned long *b)
 283 {
 284         if (unlikely(b[0]))
 285                 return __ffs(b[0]);
 286         if (unlikely(b[1]))
 287                 return __ffs(b[1]) + 32;
 288         if (unlikely(b[2]))
 289                 return __ffs(b[2]) + 64;
 290         if (b[3])
 291                 return __ffs(b[3]) + 96;
 292         return __ffs(b[4]) + 128;
 293 }
 294
 295 /*
 296  * hweightN: returns the hamming weight (i.e. the number
 297  * of bits set) of a N-bit word
 298  */
 299
 300 #define hweight32(x) generic_hweight32(x)
 301 #define hweight16(x) generic_hweight16(x)
 302 #define hweight8(x) generic_hweight8(x)
 303
 304 static __inline__ int ext2_set_bit(int nr, volatile void * addr)
 305 {
 306         int             mask, retval;
 307         unsigned long   flags;
 308         volatile unsigned char  *ADDR = (unsigned char *) addr;
 309
 310         ADDR += nr >> 3;
 311         mask = 1 << (nr & 0x07);
 312         local_irq_save(flags);
 313         retval = (mask & *ADDR) != 0;
 314         *ADDR |= mask;
 315         local_irq_restore(flags);
 316         return retval;
 317 }
 318 #define ext2_set_bit_atomic(lock, nr, addr) ext2_set_bit(nr, addr)
 319
 320 static __inline__ int ext2_clear_bit(int nr, volatile void * addr)
 321 {
 322         int             mask, retval;
 323         unsigned long   flags;
 324         volatile unsigned char  *ADDR = (unsigned char *) addr;
 325
 326         ADDR += nr >> 3;
 327         mask = 1 << (nr & 0x07);
 328         local_irq_save(flags);
 329         retval = (mask & *ADDR) != 0;
 330         *ADDR &= ~mask;
 331         local_irq_restore(flags);
 332         return retval;
 333 }
 334 #define ext2_clear_bit_atomic(lock, nr, addr) ext2_set_bit(nr, addr)
 335
 336 static __inline__ int ext2_test_bit(int nr, const volatile void * addr)
 337 {
 338         int                     mask;
 339         const volatile unsigned char    *ADDR = (const unsigned char *) addr;
 340
 341         ADDR += nr >> 3;
 342         mask = 1 << (nr & 0x07);
 343         return ((mask & *ADDR) != 0);
 344 }
 345
 346 #define ext2_find_first_zero_bit(addr, size) \
 347         ext2_find_next_zero_bit((addr), (size), 0)
 348
 349 static __inline__ unsigned long ext2_find_next_zero_bit(void *addr, unsigned long size, unsigned long offset)
 350 {
 351         unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
 352         unsigned long result = offset & ~31UL;
 353         unsigned long tmp;
 354
 355         if (offset >= size)
 356                 return size;
 357         size -= result;
 358         offset &= 31UL;
 359         if(offset) {
 360                 /* We hold the little endian value in tmp, but then the
 361                  * shift is illegal. So we could keep a big endian value
 362                  * in tmp, like this:
 363                  *
 364                  * tmp = __swab32(*(p++));
 365                  * tmp |= ~0UL >> (32-offset);
 366                  *
 367                  * but this would decrease performance, so we change the
 368                  * shift:
 369                  */
 370                 tmp = *(p++);
 371                 tmp |= __swab32(~0UL >> (32-offset));
 372                 if(size < 32)
 373                         goto found_first;
 374                 if(~tmp)
 375                         goto found_middle;
 376                 size -= 32;
 377                 result += 32;
 378         }
 379         while(size & ~31UL) {
 380                 if(~(tmp = *(p++)))
 381                         goto found_middle;
 382                 result += 32;
 383                 size -= 32;
 384         }
 385         if(!size)
 386                 return result;
 387         tmp = *p;
 388
 389 found_first:
 390         /* tmp is little endian, so we would have to swab the shift,
 391          * see above. But then we have to swab tmp below for ffz, so
 392          * we might as well do this here.
 393          */
 394         return result + ffz(__swab32(tmp) | (~0UL << size));
 395 found_middle:
 396         return result + ffz(__swab32(tmp));
 397 }
 398
 399 /* Bitmap functions for the minix filesystem.  */
 400 #define minix_test_and_set_bit(nr,addr) test_and_set_bit(nr,addr)
 401 #define minix_set_bit(nr,addr) set_bit(nr,addr)
 402 #define minix_test_and_clear_bit(nr,addr) test_and_clear_bit(nr,addr)
 403 #define minix_test_bit(nr,addr) test_bit(nr,addr)
 404 #define minix_find_first_zero_bit(addr,size) find_first_zero_bit(addr,size)
 405
 406 #endif /* __KERNEL__ */
 407
 408 #endif /* _H8300_BITOPS_H */