1#ifndef __ASM_SH_ATOMIC_LLSC_H 2#define __ASM_SH_ATOMIC_LLSC_H 3 4/* 5 * SH-4A note: 6 * 7 * We basically get atomic_xxx_return() for free compared with 8 * atomic_xxx(). movli.l/movco.l require r0 due to the instruction 9 * encoding, so the retval is automatically set without having to 10 * do any special work. 11 */ 12/* 13 * To get proper branch prediction for the main line, we must branch 14 * forward to code at the end of this object's .text section, then 15 * branch back to restart the operation. 16 */ 17 18#define ATOMIC_OP(op) \ 19static inline void atomic_##op(int i, atomic_t *v) \ 20{ \ 21 unsigned long tmp; \ 22 \ 23 __asm__ __volatile__ ( \ 24"1: movli.l @%2, %0 ! atomic_" #op "\n" \ 25" " #op " %1, %0 \n" \ 26" movco.l %0, @%2 \n" \ 27" bf 1b \n" \ 28 : "=&z" (tmp) \ 29 : "r" (i), "r" (&v->counter) \ 30 : "t"); \ 31} 32 33#define ATOMIC_OP_RETURN(op) \ 34static inline int atomic_##op##_return(int i, atomic_t *v) \ 35{ \ 36 unsigned long temp; \ 37 \ 38 __asm__ __volatile__ ( \ 39"1: movli.l @%2, %0 ! atomic_" #op "_return \n" \ 40" " #op " %1, %0 \n" \ 41" movco.l %0, @%2 \n" \ 42" bf 1b \n" \ 43" synco \n" \ 44 : "=&z" (temp) \ 45 : "r" (i), "r" (&v->counter) \ 46 : "t"); \ 47 \ 48 return temp; \ 49} 50 51#define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) 52 53ATOMIC_OPS(add) 54ATOMIC_OPS(sub) 55ATOMIC_OP(and) 56ATOMIC_OP(or) 57ATOMIC_OP(xor) 58 59#undef ATOMIC_OPS 60#undef ATOMIC_OP_RETURN 61#undef ATOMIC_OP 62 63#endif /* __ASM_SH_ATOMIC_LLSC_H */ 64