diff options
Diffstat (limited to 'include/asm-sparc64/backoff.h')
| -rw-r--r-- | include/asm-sparc64/backoff.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/include/asm-sparc64/backoff.h b/include/asm-sparc64/backoff.h new file mode 100644 index 000000000000..0e32f8b62fd2 --- /dev/null +++ b/include/asm-sparc64/backoff.h @@ -0,0 +1,28 @@ +#ifndef _SPARC64_BACKOFF_H +#define _SPARC64_BACKOFF_H + +#define BACKOFF_LIMIT (4 * 1024) + +#ifdef CONFIG_SMP + +#define BACKOFF_SETUP(reg) \ + mov 1, reg + +#define BACKOFF_SPIN(reg, tmp, label) \ + mov reg, tmp; \ +88: brnz,pt tmp, 88b; \ + sub tmp, 1, tmp; \ + cmp reg, BACKOFF_LIMIT; \ + bg,pn %xcc, label; \ + nop; \ + ba,pt %xcc, label; \ + sllx reg, 1, reg; + +#else + +#define BACKOFF_SETUP(reg) +#define BACKOFF_SPIN(reg, tmp, label) + +#endif + +#endif /* _SPARC64_BACKOFF_H */ |