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_LABEL(spin_label, continue_label) \ 12 spin_label 13 14 #define BACKOFF_SPIN(reg, tmp, label) \ 15 mov reg, tmp; \ 16 88: brnz,pt tmp, 88b; \ 17 sub tmp, 1, tmp; \ 18 set BACKOFF_LIMIT, tmp; \ 19 cmp reg, tmp; \ 20 bg,pn %xcc, label; \ 21 nop; \ 22 ba,pt %xcc, label; \ 23 sllx reg, 1, reg; 24 25 #else 26 27 #define BACKOFF_SETUP(reg) 28 29 #define BACKOFF_LABEL(spin_label, continue_label) \ 30 continue_label 31 32 #define BACKOFF_SPIN(reg, tmp, label) 33 34 #endif 35 36 #endif /* _SPARC64_BACKOFF_H */ 37