arch/sparc/include/asm/backoff.h

   1 #ifndef _SPARC64_BACKOFF_H
   2 #define _SPARC64_BACKOFF_H
   3
   4 #define BACKOFF_LIMIT   (4 * 1024)
   5
   6 #ifdef CONFIG_SMP
   7
   8 #define BACKOFF_SETUP(reg)      \
   9         mov     1, reg
  10
  11 #define BACKOFF_SPIN(reg, tmp, label)   \
  12         mov     reg, tmp; \
  13 88:     brnz,pt tmp, 88b; \
  14          sub    tmp, 1, tmp; \
  15         set     BACKOFF_LIMIT, tmp; \
  16         cmp     reg, tmp; \
  17         bg,pn   %xcc, label; \
  18          nop; \
  19         ba,pt   %xcc, label; \
  20          sllx   reg, 1, reg;
  21
  22 #else
  23
  24 #define BACKOFF_SETUP(reg)
  25 #define BACKOFF_SPIN(reg, tmp, label) \
  26         ba,pt   %xcc, label; \
  27          nop;
  28
  29 #endif
  30
  31 #endif /* _SPARC64_BACKOFF_H */