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C/C++ Source or Header  |  2008-12-24  |  1.4 KB  |  72 lines
  1. #ifndef __ASM_SH_CMPXCHG_LLSC_H
  2. #define __ASM_SH_CMPXCHG_LLSC_H
  3.  
  4. static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
  5. {
  6.     unsigned long retval;
  7.     unsigned long tmp;
  8.  
  9.     __asm__ __volatile__ (
  10.         "1:                    \n\t"
  11.         "movli.l    @%1, %0    ! xchg_u32    \n\t"
  12.         "mov        %0, %2            \n\t"
  13.         "mov        %4, %0            \n\t"
  14.         "movco.l    %0, @%1            \n\t"
  15.         "bf        1b            \n\t"
  16.         "synco                    \n\t"
  17.         : "=&z"(tmp), "=r" (m), "=&r" (retval)
  18.         : "1" (m), "r" (val)
  19.         : "t", "memory"
  20.     );
  21.  
  22.     return retval;
  23. }
  24.  
  25. static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
  26. {
  27.     unsigned long retval;
  28.     unsigned long tmp;
  29.  
  30.     __asm__ __volatile__ (
  31.         "1:                    \n\t"
  32.         "movli.l    @%1, %0    ! xchg_u8    \n\t"
  33.         "mov        %0, %2            \n\t"
  34.         "mov        %4, %0            \n\t"
  35.         "movco.l    %0, @%1            \n\t"
  36.         "bf        1b            \n\t"
  37.         "synco                    \n\t"
  38.         : "=&z"(tmp), "=r" (m), "=&r" (retval)
  39.         : "1" (m), "r" (val & 0xff)
  40.         : "t", "memory"
  41.     );
  42.  
  43.     return retval;
  44. }
  45.  
  46. static inline unsigned long
  47. __cmpxchg_u32(volatile int *m, unsigned long old, unsigned long new)
  48. {
  49.     unsigned long retval;
  50.     unsigned long tmp;
  51.  
  52.     __asm__ __volatile__ (
  53.         "1:                        \n\t"
  54.         "movli.l    @%1, %0    ! __cmpxchg_u32        \n\t"
  55.         "mov        %0, %2                \n\t"
  56.         "cmp/eq        %2, %4                \n\t"
  57.         "bf        2f                \n\t"
  58.         "mov        %5, %0                \n\t"
  59.         "2:                        \n\t"
  60.         "movco.l    %0, @%1                \n\t"
  61.         "bf        1b                \n\t"
  62.         "synco                        \n\t"
  63.         : "=&z" (tmp), "=r" (m), "=&r" (retval)
  64.         : "1" (m), "r" (old), "r" (new)
  65.         : "t", "memory"
  66.     );
  67.  
  68.     return retval;
  69. }
  70.  
  71. #endif /* __ASM_SH_CMPXCHG_LLSC_H */
  72.