| Sam Ravnborg | a00736e | 2008-06-19 20:26:19 +0200 | [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 | |
| David S. Miller | 0f58189 | 2010-08-18 22:53:26 -0700 | [diff] [blame] | 11 | #define BACKOFF_LABEL(spin_label, continue_label) \ |
| 12 | spin_label |
| 13 | |
| David S. Miller | e9b9eb5 | 2012-10-27 23:00:41 -0700 | [diff] [blame^] | 14 | #define BACKOFF_SPIN(reg, tmp, label) \ |
| 15 | mov reg, tmp; \ |
| 16 | 88: rd %ccr, %g0; \ |
| 17 | rd %ccr, %g0; \ |
| 18 | rd %ccr, %g0; \ |
| 19 | .section .pause_patch,"ax"; \ |
| 20 | .word 88b; \ |
| 21 | sllx tmp, 7, tmp; \ |
| 22 | wr tmp, 0, %asr27; \ |
| 23 | clr tmp; \ |
| 24 | .previous; \ |
| 25 | brnz,pt tmp, 88b; \ |
| 26 | sub tmp, 1, tmp; \ |
| 27 | set BACKOFF_LIMIT, tmp; \ |
| 28 | cmp reg, tmp; \ |
| 29 | bg,pn %xcc, label; \ |
| 30 | nop; \ |
| 31 | ba,pt %xcc, label; \ |
| 32 | sllx reg, 1, reg; |
| Sam Ravnborg | a00736e | 2008-06-19 20:26:19 +0200 | [diff] [blame] | 33 | |
| 34 | #else |
| 35 | |
| 36 | #define BACKOFF_SETUP(reg) |
| David S. Miller | 0f58189 | 2010-08-18 22:53:26 -0700 | [diff] [blame] | 37 | |
| 38 | #define BACKOFF_LABEL(spin_label, continue_label) \ |
| 39 | continue_label |
| 40 | |
| 41 | #define BACKOFF_SPIN(reg, tmp, label) |
| Sam Ravnborg | a00736e | 2008-06-19 20:26:19 +0200 | [diff] [blame] | 42 | |
| 43 | #endif |
| 44 | |
| 45 | #endif /* _SPARC64_BACKOFF_H */ |