| David S. Miller | 24f287e | 2007-10-15 16:41:44 -0700 | [diff] [blame] | 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 | cmp reg, BACKOFF_LIMIT; \ |
| 16 | bg,pn %xcc, label; \ |
| 17 | nop; \ |
| 18 | ba,pt %xcc, label; \ |
| 19 | sllx reg, 1, reg; |
| 20 | |
| 21 | #else |
| 22 | |
| 23 | #define BACKOFF_SETUP(reg) |
| 24 | #define BACKOFF_SPIN(reg, tmp, label) |
| 25 | |
| 26 | #endif |
| 27 | |
| 28 | #endif /* _SPARC64_BACKOFF_H */ |