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__ int find_next_zero_bit (void * addr, int size, int offset)
 185 {
 186         unsigned long *p = (unsigned long *)(((unsigned long)addr + (offset >> 3)) & ~3);
 187         unsigned long result = offset & ~31UL;
 188         unsigned long tmp;
 189
 190         if (offset >= size)
 191                 return size;
 192         size -= result;
 193         offset &= 31UL;
 194         if (offset) {
 195                 tmp = *(p++);
 196                 tmp |= ~0UL >> (32-offset);
 197                 if (size < 32)
 198                         goto found_first;
 199                 if (~tmp)
 200                         goto found_middle;
 201                 size -= 32;
 202                 result += 32;
 203         }
 204         while (size & ~31UL) {
 205                 if (~(tmp = *(p++)))
 206                         goto found_middle;
 207                 result += 32;
 208                 size -= 32;
 209         }
 210         if (!size)
 211                 return result;
 212         tmp = *p;
 213
 214 found_first:
 215         tmp |= ~0UL >> size;
 216 found_middle:
 217         return result + ffz(tmp);
 218 }
 219
 220 static __inline__ unsigned long __ffs(unsigned long word)
 221 {
 222         unsigned long result;
 223
 224         result = -1;
 225         __asm__("1:\n\t"
 226                 "shlr.l %2\n\t"
 227                 "adds #1,%0\n\t"
 228                 "bcc 1b"
 229                 : "=r" (result)
 230                 : "0"(result),"r"(word));
 231         return result;
 232 }
 233
 234 #define ffs(x) generic_ffs(x)
 235 #define fls(x) generic_fls(x)
 236
 237 /*
 238  * Every architecture must define this function. It's the fastest
 239  * way of searching a 140-bit bitmap where the first 100 bits are
 240  * unlikely to be set. It's guaranteed that at least one of the 140
 241  * bits is cleared.
 242  */
 243 static inline int sched_find_first_bit(unsigned long *b)
 244 {
 245         if (unlikely(b[0]))
 246                 return __ffs(b[0]);
 247         if (unlikely(b[1]))
 248                 return __ffs(b[1]) + 32;
 249         if (unlikely(b[2]))
 250                 return __ffs(b[2]) + 64;
 251         if (b[3])
 252                 return __ffs(b[3]) + 96;
 253         return __ffs(b[4]) + 128;
 254 }
 255
 256 /*
 257  * hweightN: returns the hamming weight (i.e. the number
 258  * of bits set) of a N-bit word
 259  */
 260
 261 #define hweight32(x) generic_hweight32(x)
 262 #define hweight16(x) generic_hweight16(x)
 263 #define hweight8(x) generic_hweight8(x)
 264
 265 static __inline__ int ext2_set_bit(int nr, volatile void * addr)
 266 {
 267         int             mask, retval;
 268         unsigned long   flags;
 269         volatile unsigned char  *ADDR = (unsigned char *) addr;
 270
 271         ADDR += nr >> 3;
 272         mask = 1 << (nr & 0x07);
 273         local_irq_save(flags);
 274         retval = (mask & *ADDR) != 0;
 275         *ADDR |= mask;
 276         local_irq_restore(flags);
 277         return retval;
 278 }
 279 #define ext2_set_bit_atomic(lock, nr, addr) ext2_set_bit(nr, addr)
 280
 281 static __inline__ int ext2_clear_bit(int nr, volatile void * addr)
 282 {
 283         int             mask, retval;
 284         unsigned long   flags;
 285         volatile unsigned char  *ADDR = (unsigned char *) addr;
 286
 287         ADDR += nr >> 3;
 288         mask = 1 << (nr & 0x07);
 289         local_irq_save(flags);
 290         retval = (mask & *ADDR) != 0;
 291         *ADDR &= ~mask;
 292         local_irq_restore(flags);
 293         return retval;
 294 }
 295 #define ext2_clear_bit_atomic(lock, nr, addr) ext2_set_bit(nr, addr)
 296
 297 static __inline__ int ext2_test_bit(int nr, const volatile void * addr)
 298 {
 299         int                     mask;
 300         const volatile unsigned char    *ADDR = (const unsigned char *) addr;
 301
 302         ADDR += nr >> 3;
 303         mask = 1 << (nr & 0x07);
 304         return ((mask & *ADDR) != 0);
 305 }
 306
 307 #define ext2_find_first_zero_bit(addr, size) \
 308         ext2_find_next_zero_bit((addr), (size), 0)
 309
 310 static __inline__ unsigned long ext2_find_next_zero_bit(void *addr, unsigned long size, unsigned long offset)
 311 {
 312         unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
 313         unsigned long result = offset & ~31UL;
 314         unsigned long tmp;
 315
 316         if (offset >= size)
 317                 return size;
 318         size -= result;
 319         offset &= 31UL;
 320         if(offset) {
 321                 /* We hold the little endian value in tmp, but then the
 322                  * shift is illegal. So we could keep a big endian value
 323                  * in tmp, like this:
 324                  *
 325                  * tmp = __swab32(*(p++));
 326                  * tmp |= ~0UL >> (32-offset);
 327                  *
 328                  * but this would decrease performance, so we change the
 329                  * shift:
 330                  */
 331                 tmp = *(p++);
 332                 tmp |= __swab32(~0UL >> (32-offset));
 333                 if(size < 32)
 334                         goto found_first;
 335                 if(~tmp)
 336                         goto found_middle;
 337                 size -= 32;
 338                 result += 32;
 339         }
 340         while(size & ~31UL) {
 341                 if(~(tmp = *(p++)))
 342                         goto found_middle;
 343                 result += 32;
 344                 size -= 32;
 345         }
 346         if(!size)
 347                 return result;
 348         tmp = *p;
 349
 350 found_first:
 351         /* tmp is little endian, so we would have to swab the shift,
 352          * see above. But then we have to swab tmp below for ffz, so
 353          * we might as well do this here.
 354          */
 355         return result + ffz(__swab32(tmp) | (~0UL << size));
 356 found_middle:
 357         return result + ffz(__swab32(tmp));
 358 }
 359
 360 /* Bitmap functions for the minix filesystem.  */
 361 #define minix_test_and_set_bit(nr,addr) test_and_set_bit(nr,addr)
 362 #define minix_set_bit(nr,addr) set_bit(nr,addr)
 363 #define minix_test_and_clear_bit(nr,addr) test_and_clear_bit(nr,addr)
 364 #define minix_test_bit(nr,addr) test_bit(nr,addr)
 365 #define minix_find_first_zero_bit(addr,size) find_first_zero_bit(addr,size)
 366
 367 #endif /* __KERNEL__ */
 368
 369 #endif /* _H8300_BITOPS_H */