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Text File  |  1999-09-17  |  2KB  |  69 lines
  1. #ifndef _SPARC64_SEMAPHORE_HELPER_H
  2. #define _SPARC64_SEMAPHORE_HELPER_H
  3.  
  4. /*
  5.  * SMP- and interrupt-safe semaphore helper functions, sparc64 version.
  6.  *
  7.  * (C) Copyright 1999 David S. Miller (davem@redhat.com)
  8.  * (C) Copyright 1999 Jakub Jelinek (jj@ultra.linux.cz)
  9.  */
  10. #define wake_one_more(__sem)      atomic_inc(&((__sem)->waking));
  11. #define waking_non_zero(__sem)                \
  12. ({    int __ret;                    \
  13.     __asm__ __volatile__(                \
  14. "1:    ldsw        [%1], %%g5\n\t"            \
  15.     "brlez,pt    %%g5, 2f\n\t"            \
  16.     " mov        0, %0\n\t"            \
  17.     "sub        %%g5, 1, %%g7\n\t"        \
  18.     "cas        [%1], %%g5, %%g7\n\t"        \
  19.     "cmp        %%g5, %%g7\n\t"            \
  20.     "bne,pn        %%icc, 1b\n\t"            \
  21.     " mov        1, %0\n"            \
  22. "2:"    : "=&r" (__ret)                    \
  23.     : "r" (&((__sem)->waking))            \
  24.     : "g5", "g7", "cc", "memory");            \
  25.     __ret;                        \
  26. })
  27.  
  28. #define waking_non_zero_interruptible(__sem, __tsk)    \
  29. ({    int __ret;                    \
  30.     __asm__ __volatile__(                \
  31. "1:    ldsw        [%1], %%g5\n\t"            \
  32.     "brlez,pt    %%g5, 2f\n\t"            \
  33.     " mov        0, %0\n\t"            \
  34.     "sub        %%g5, 1, %%g7\n\t"        \
  35.     "cas        [%1], %%g5, %%g7\n\t"        \
  36.     "cmp        %%g5, %%g7\n\t"            \
  37.     "bne,pn        %%icc, 1b\n\t"            \
  38.     " mov        1, %0\n"            \
  39. "2:"    : "=&r" (__ret)                    \
  40.     : "r" (&((__sem)->waking))            \
  41.     : "g5", "g7", "cc", "memory");            \
  42.     if(__ret == 0 && signal_pending(__tsk)) {    \
  43.         atomic_inc(&((__sem)->count));        \
  44.         __ret = -EINTR;                \
  45.     }                        \
  46.     __ret;                        \
  47. })
  48.  
  49. #define waking_non_zero_trylock(__sem)            \
  50. ({    int __ret;                    \
  51.     __asm__ __volatile__(                \
  52. "1:    ldsw        [%1], %%g5\n\t"            \
  53.     "brlez,pt    %%g5, 2f\n\t"            \
  54.     " mov        1, %0\n\t"            \
  55.     "sub        %%g5, 1, %%g7\n\t"        \
  56.     "cas        [%1], %%g5, %%g7\n\t"        \
  57.     "cmp        %%g5, %%g7\n\t"            \
  58.     "bne,pn        %%icc, 1b\n\t"            \
  59.     " mov        0, %0\n"            \
  60. "2:"    : "=&r" (__ret)                    \
  61.     : "r" (&((__sem)->waking))            \
  62.     : "g5", "g7", "cc", "memory");            \
  63.     if(__ret == 1)                    \
  64.         atomic_inc(&((__sem)->count));        \
  65.     __ret;                        \
  66. })
  67.  
  68. #endif /* !(_SPARC64_SEMAPHORE_HELPER_H) */
  69.