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C/C++ Source or Header  |  2006-08-11  |  5.9 KB  |  207 lines
  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/compiler.h>
  10. #include <asm/system.h>
  11.  
  12. #ifdef __KERNEL__
  13. /*
  14.  * Function prototypes to keep gcc -Wall happy
  15.  */
  16.  
  17. /*
  18.  * ffz = Find First Zero in word. Undefined if no zero exists,
  19.  * so code should check against ~0UL first..
  20.  */
  21. static __inline__ unsigned long ffz(unsigned long word)
  22. {
  23.     unsigned long result;
  24.  
  25.     result = -1;
  26.     __asm__("1:\n\t"
  27.         "shlr.l %2\n\t"
  28.         "adds #1,%0\n\t"
  29.         "bcs 1b"
  30.         : "=r" (result)
  31.         : "0"  (result),"r" (word));
  32.     return result;
  33. }
  34.  
  35. #define H8300_GEN_BITOP_CONST(OP,BIT)                \
  36.     case BIT:                        \
  37.     __asm__(OP " #" #BIT ",@%0"::"r"(b_addr):"memory"); \
  38.     break;
  39.  
  40. #define H8300_GEN_BITOP(FNAME,OP)                      \
  41. static __inline__ void FNAME(int nr, volatile unsigned long* addr)    \
  42. {                                      \
  43.     volatile unsigned char *b_addr;                      \
  44.     b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3);    \
  45.     if (__builtin_constant_p(nr)) {                      \
  46.         switch(nr & 7) {                      \
  47.             H8300_GEN_BITOP_CONST(OP,0)              \
  48.             H8300_GEN_BITOP_CONST(OP,1)              \
  49.             H8300_GEN_BITOP_CONST(OP,2)              \
  50.             H8300_GEN_BITOP_CONST(OP,3)              \
  51.             H8300_GEN_BITOP_CONST(OP,4)              \
  52.             H8300_GEN_BITOP_CONST(OP,5)              \
  53.             H8300_GEN_BITOP_CONST(OP,6)              \
  54.             H8300_GEN_BITOP_CONST(OP,7)              \
  55.         }                              \
  56.     } else {                              \
  57.         __asm__(OP " %w0,@%1"::"r"(nr),"r"(b_addr):"memory"); \
  58.     }                                  \
  59. }
  60.  
  61. /*
  62.  * clear_bit() doesn't provide any barrier for the compiler.
  63.  */
  64. #define smp_mb__before_clear_bit()    barrier()
  65. #define smp_mb__after_clear_bit()    barrier()
  66.  
  67. H8300_GEN_BITOP(set_bit      ,"bset")
  68. H8300_GEN_BITOP(clear_bit ,"bclr")
  69. H8300_GEN_BITOP(change_bit,"bnot")
  70. #define __set_bit(nr,addr)    set_bit((nr),(addr))
  71. #define __clear_bit(nr,addr)  clear_bit((nr),(addr))
  72. #define __change_bit(nr,addr) change_bit((nr),(addr))
  73.  
  74. #undef H8300_GEN_BITOP
  75. #undef H8300_GEN_BITOP_CONST
  76.  
  77. static __inline__ int test_bit(int nr, const unsigned long* addr)
  78. {
  79.     return (*((volatile unsigned char *)addr + 
  80.                ((nr >> 3) ^ 3)) & (1UL << (nr & 7))) != 0;
  81. }
  82.  
  83. #define __test_bit(nr, addr) test_bit(nr, addr)
  84.  
  85. #define H8300_GEN_TEST_BITOP_CONST_INT(OP,BIT)                 \
  86.     case BIT:                             \
  87.     __asm__("stc ccr,%w1\n\t"                     \
  88.         "orc #0x80,ccr\n\t"                     \
  89.         "bld #" #BIT ",@%4\n\t"                     \
  90.         OP " #" #BIT ",@%4\n\t"                     \
  91.         "rotxl.l %0\n\t"                     \
  92.         "ldc %w1,ccr"                         \
  93.         : "=r"(retval),"=&r"(ccrsave),"=m"(*b_addr)         \
  94.         : "0" (retval),"r" (b_addr)                 \
  95.         : "memory");                                         \
  96.         break;
  97.  
  98. #define H8300_GEN_TEST_BITOP_CONST(OP,BIT)                 \
  99.     case BIT:                             \
  100.     __asm__("bld #" #BIT ",@%3\n\t"                     \
  101.         OP " #" #BIT ",@%3\n\t"                     \
  102.         "rotxl.l %0\n\t"                     \
  103.         : "=r"(retval),"=m"(*b_addr)                 \
  104.         : "0" (retval),"r" (b_addr)                 \
  105.         : "memory");                                         \
  106.         break;
  107.  
  108. #define H8300_GEN_TEST_BITOP(FNNAME,OP)                     \
  109. static __inline__ int FNNAME(int nr, volatile void * addr)         \
  110. {                                     \
  111.     int retval = 0;                             \
  112.     char ccrsave;                             \
  113.     volatile unsigned char *b_addr;                     \
  114.     b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3);   \
  115.     if (__builtin_constant_p(nr)) {                     \
  116.         switch(nr & 7) {                     \
  117.             H8300_GEN_TEST_BITOP_CONST_INT(OP,0)         \
  118.             H8300_GEN_TEST_BITOP_CONST_INT(OP,1)         \
  119.             H8300_GEN_TEST_BITOP_CONST_INT(OP,2)         \
  120.             H8300_GEN_TEST_BITOP_CONST_INT(OP,3)         \
  121.             H8300_GEN_TEST_BITOP_CONST_INT(OP,4)         \
  122.             H8300_GEN_TEST_BITOP_CONST_INT(OP,5)         \
  123.             H8300_GEN_TEST_BITOP_CONST_INT(OP,6)         \
  124.             H8300_GEN_TEST_BITOP_CONST_INT(OP,7)         \
  125.         }                             \
  126.     } else {                             \
  127.         __asm__("stc ccr,%w1\n\t"                 \
  128.             "orc #0x80,ccr\n\t"                 \
  129.             "btst %w5,@%4\n\t"                 \
  130.             OP " %w5,@%4\n\t"                 \
  131.             "beq 1f\n\t"                     \
  132.             "inc.l #1,%0\n"                     \
  133.             "1:\n\t"                     \
  134.             "ldc %w1,ccr"                     \
  135.             : "=r"(retval),"=&r"(ccrsave),"=m"(*b_addr)  \
  136.             : "0" (retval),"r" (b_addr),"r"(nr)         \
  137.             : "memory");                     \
  138.     }                                 \
  139.     return retval;                             \
  140. }                                     \
  141.                                      \
  142. static __inline__ int __ ## FNNAME(int nr, volatile void * addr)     \
  143. {                                     \
  144.     int retval = 0;                             \
  145.     volatile unsigned char *b_addr;                     \
  146.     b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3);   \
  147.     if (__builtin_constant_p(nr)) {                     \
  148.         switch(nr & 7) {                     \
  149.             H8300_GEN_TEST_BITOP_CONST(OP,0)          \
  150.             H8300_GEN_TEST_BITOP_CONST(OP,1)          \
  151.             H8300_GEN_TEST_BITOP_CONST(OP,2)          \
  152.             H8300_GEN_TEST_BITOP_CONST(OP,3)          \
  153.             H8300_GEN_TEST_BITOP_CONST(OP,4)          \
  154.             H8300_GEN_TEST_BITOP_CONST(OP,5)          \
  155.             H8300_GEN_TEST_BITOP_CONST(OP,6)          \
  156.             H8300_GEN_TEST_BITOP_CONST(OP,7)          \
  157.         }                             \
  158.     } else {                             \
  159.         __asm__("btst %w4,@%3\n\t"                 \
  160.             OP " %w4,@%3\n\t"                 \
  161.             "beq 1f\n\t"                     \
  162.             "inc.l #1,%0\n"                     \
  163.             "1:"                         \
  164.             : "=r"(retval),"=m"(*b_addr)             \
  165.             : "0" (retval),"r" (b_addr),"r"(nr)         \
  166.             : "memory");                     \
  167.     }                                 \
  168.     return retval;                             \
  169. }
  170.  
  171. H8300_GEN_TEST_BITOP(test_and_set_bit,     "bset")
  172. H8300_GEN_TEST_BITOP(test_and_clear_bit, "bclr")
  173. H8300_GEN_TEST_BITOP(test_and_change_bit,"bnot")
  174. #undef H8300_GEN_TEST_BITOP_CONST
  175. #undef H8300_GEN_TEST_BITOP_CONST_INT
  176. #undef H8300_GEN_TEST_BITOP
  177.  
  178. #include <asm-generic/bitops/ffs.h>
  179.  
  180. static __inline__ unsigned long __ffs(unsigned long word)
  181. {
  182.     unsigned long result;
  183.  
  184.     result = -1;
  185.     __asm__("1:\n\t"
  186.         "shlr.l %2\n\t"
  187.         "adds #1,%0\n\t"
  188.         "bcc 1b"
  189.         : "=r" (result)
  190.         : "0"(result),"r"(word));
  191.     return result;
  192. }
  193.  
  194. #include <asm-generic/bitops/find.h>
  195. #include <asm-generic/bitops/sched.h>
  196. #include <asm-generic/bitops/hweight.h>
  197. #include <asm-generic/bitops/ext2-non-atomic.h>
  198. #include <asm-generic/bitops/ext2-atomic.h>
  199. #include <asm-generic/bitops/minix.h>
  200.  
  201. #endif /* __KERNEL__ */
  202.  
  203. #include <asm-generic/bitops/fls.h>
  204. #include <asm-generic/bitops/fls64.h>
  205.  
  206. #endif /* _H8300_BITOPS_H */
  207.