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C/C++ Source or Header  |  2008-12-24  |  6.0 KB  |  213 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. #ifndef _LINUX_BITOPS_H
  15. #error only <linux/bitops.h> can be included directly
  16. #endif
  17.  
  18. /*
  19.  * Function prototypes to keep gcc -Wall happy
  20.  */
  21.  
  22. /*
  23.  * ffz = Find First Zero in word. Undefined if no zero exists,
  24.  * so code should check against ~0UL first..
  25.  */
  26. static __inline__ unsigned long ffz(unsigned long word)
  27. {
  28.     unsigned long result;
  29.  
  30.     result = -1;
  31.     __asm__("1:\n\t"
  32.         "shlr.l %2\n\t"
  33.         "adds #1,%0\n\t"
  34.         "bcs 1b"
  35.         : "=r" (result)
  36.         : "0"  (result),"r" (word));
  37.     return result;
  38. }
  39.  
  40. #define H8300_GEN_BITOP_CONST(OP,BIT)                \
  41.     case BIT:                        \
  42.     __asm__(OP " #" #BIT ",@%0"::"r"(b_addr):"memory"); \
  43.     break;
  44.  
  45. #define H8300_GEN_BITOP(FNAME,OP)                      \
  46. static __inline__ void FNAME(int nr, volatile unsigned long* addr)    \
  47. {                                      \
  48.     volatile unsigned char *b_addr;                      \
  49.     b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3);    \
  50.     if (__builtin_constant_p(nr)) {                      \
  51.         switch(nr & 7) {                      \
  52.             H8300_GEN_BITOP_CONST(OP,0)              \
  53.             H8300_GEN_BITOP_CONST(OP,1)              \
  54.             H8300_GEN_BITOP_CONST(OP,2)              \
  55.             H8300_GEN_BITOP_CONST(OP,3)              \
  56.             H8300_GEN_BITOP_CONST(OP,4)              \
  57.             H8300_GEN_BITOP_CONST(OP,5)              \
  58.             H8300_GEN_BITOP_CONST(OP,6)              \
  59.             H8300_GEN_BITOP_CONST(OP,7)              \
  60.         }                              \
  61.     } else {                              \
  62.         __asm__(OP " %w0,@%1"::"r"(nr),"r"(b_addr):"memory"); \
  63.     }                                  \
  64. }
  65.  
  66. /*
  67.  * clear_bit() doesn't provide any barrier for the compiler.
  68.  */
  69. #define smp_mb__before_clear_bit()    barrier()
  70. #define smp_mb__after_clear_bit()    barrier()
  71.  
  72. H8300_GEN_BITOP(set_bit      ,"bset")
  73. H8300_GEN_BITOP(clear_bit ,"bclr")
  74. H8300_GEN_BITOP(change_bit,"bnot")
  75. #define __set_bit(nr,addr)    set_bit((nr),(addr))
  76. #define __clear_bit(nr,addr)  clear_bit((nr),(addr))
  77. #define __change_bit(nr,addr) change_bit((nr),(addr))
  78.  
  79. #undef H8300_GEN_BITOP
  80. #undef H8300_GEN_BITOP_CONST
  81.  
  82. static __inline__ int test_bit(int nr, const unsigned long* addr)
  83. {
  84.     return (*((volatile unsigned char *)addr + 
  85.                ((nr >> 3) ^ 3)) & (1UL << (nr & 7))) != 0;
  86. }
  87.  
  88. #define __test_bit(nr, addr) test_bit(nr, addr)
  89.  
  90. #define H8300_GEN_TEST_BITOP_CONST_INT(OP,BIT)                 \
  91.     case BIT:                             \
  92.     __asm__("stc ccr,%w1\n\t"                     \
  93.         "orc #0x80,ccr\n\t"                     \
  94.         "bld #" #BIT ",@%4\n\t"                     \
  95.         OP " #" #BIT ",@%4\n\t"                     \
  96.         "rotxl.l %0\n\t"                     \
  97.         "ldc %w1,ccr"                         \
  98.         : "=r"(retval),"=&r"(ccrsave),"=m"(*b_addr)         \
  99.         : "0" (retval),"r" (b_addr)                 \
  100.         : "memory");                                         \
  101.         break;
  102.  
  103. #define H8300_GEN_TEST_BITOP_CONST(OP,BIT)                 \
  104.     case BIT:                             \
  105.     __asm__("bld #" #BIT ",@%3\n\t"                     \
  106.         OP " #" #BIT ",@%3\n\t"                     \
  107.         "rotxl.l %0\n\t"                     \
  108.         : "=r"(retval),"=m"(*b_addr)                 \
  109.         : "0" (retval),"r" (b_addr)                 \
  110.         : "memory");                                         \
  111.         break;
  112.  
  113. #define H8300_GEN_TEST_BITOP(FNNAME,OP)                     \
  114. static __inline__ int FNNAME(int nr, volatile void * addr)         \
  115. {                                     \
  116.     int retval = 0;                             \
  117.     char ccrsave;                             \
  118.     volatile unsigned char *b_addr;                     \
  119.     b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3);   \
  120.     if (__builtin_constant_p(nr)) {                     \
  121.         switch(nr & 7) {                     \
  122.             H8300_GEN_TEST_BITOP_CONST_INT(OP,0)         \
  123.             H8300_GEN_TEST_BITOP_CONST_INT(OP,1)         \
  124.             H8300_GEN_TEST_BITOP_CONST_INT(OP,2)         \
  125.             H8300_GEN_TEST_BITOP_CONST_INT(OP,3)         \
  126.             H8300_GEN_TEST_BITOP_CONST_INT(OP,4)         \
  127.             H8300_GEN_TEST_BITOP_CONST_INT(OP,5)         \
  128.             H8300_GEN_TEST_BITOP_CONST_INT(OP,6)         \
  129.             H8300_GEN_TEST_BITOP_CONST_INT(OP,7)         \
  130.         }                             \
  131.     } else {                             \
  132.         __asm__("stc ccr,%w1\n\t"                 \
  133.             "orc #0x80,ccr\n\t"                 \
  134.             "btst %w5,@%4\n\t"                 \
  135.             OP " %w5,@%4\n\t"                 \
  136.             "beq 1f\n\t"                     \
  137.             "inc.l #1,%0\n"                     \
  138.             "1:\n\t"                     \
  139.             "ldc %w1,ccr"                     \
  140.             : "=r"(retval),"=&r"(ccrsave),"=m"(*b_addr)  \
  141.             : "0" (retval),"r" (b_addr),"r"(nr)         \
  142.             : "memory");                     \
  143.     }                                 \
  144.     return retval;                             \
  145. }                                     \
  146.                                      \
  147. static __inline__ int __ ## FNNAME(int nr, volatile void * addr)     \
  148. {                                     \
  149.     int retval = 0;                             \
  150.     volatile unsigned char *b_addr;                     \
  151.     b_addr = (volatile unsigned char *)addr + ((nr >> 3) ^ 3);   \
  152.     if (__builtin_constant_p(nr)) {                     \
  153.         switch(nr & 7) {                     \
  154.             H8300_GEN_TEST_BITOP_CONST(OP,0)          \
  155.             H8300_GEN_TEST_BITOP_CONST(OP,1)          \
  156.             H8300_GEN_TEST_BITOP_CONST(OP,2)          \
  157.             H8300_GEN_TEST_BITOP_CONST(OP,3)          \
  158.             H8300_GEN_TEST_BITOP_CONST(OP,4)          \
  159.             H8300_GEN_TEST_BITOP_CONST(OP,5)          \
  160.             H8300_GEN_TEST_BITOP_CONST(OP,6)          \
  161.             H8300_GEN_TEST_BITOP_CONST(OP,7)          \
  162.         }                             \
  163.     } else {                             \
  164.         __asm__("btst %w4,@%3\n\t"                 \
  165.             OP " %w4,@%3\n\t"                 \
  166.             "beq 1f\n\t"                     \
  167.             "inc.l #1,%0\n"                     \
  168.             "1:"                         \
  169.             : "=r"(retval),"=m"(*b_addr)             \
  170.             : "0" (retval),"r" (b_addr),"r"(nr)         \
  171.             : "memory");                     \
  172.     }                                 \
  173.     return retval;                             \
  174. }
  175.  
  176. H8300_GEN_TEST_BITOP(test_and_set_bit,     "bset")
  177. H8300_GEN_TEST_BITOP(test_and_clear_bit, "bclr")
  178. H8300_GEN_TEST_BITOP(test_and_change_bit,"bnot")
  179. #undef H8300_GEN_TEST_BITOP_CONST
  180. #undef H8300_GEN_TEST_BITOP_CONST_INT
  181. #undef H8300_GEN_TEST_BITOP
  182.  
  183. #include <asm-generic/bitops/ffs.h>
  184.  
  185. static __inline__ unsigned long __ffs(unsigned long word)
  186. {
  187.     unsigned long result;
  188.  
  189.     result = -1;
  190.     __asm__("1:\n\t"
  191.         "shlr.l %2\n\t"
  192.         "adds #1,%0\n\t"
  193.         "bcc 1b"
  194.         : "=r" (result)
  195.         : "0"(result),"r"(word));
  196.     return result;
  197. }
  198.  
  199. #include <asm-generic/bitops/find.h>
  200. #include <asm-generic/bitops/sched.h>
  201. #include <asm-generic/bitops/hweight.h>
  202. #include <asm-generic/bitops/lock.h>
  203. #include <asm-generic/bitops/ext2-non-atomic.h>
  204. #include <asm-generic/bitops/ext2-atomic.h>
  205. #include <asm-generic/bitops/minix.h>
  206.  
  207. #endif /* __KERNEL__ */
  208.  
  209. #include <asm-generic/bitops/fls.h>
  210. #include <asm-generic/bitops/fls64.h>
  211.  
  212. #endif /* _H8300_BITOPS_H */
  213.