1 #ifndef __ASM_SH_ATOMIC_LLSC_H
2 #define __ASM_SH_ATOMIC_LLSC_H
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.
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.
18 #define ATOMIC_OP(op) \
19 static inline void atomic_##op(int i, atomic_t *v) \
23 __asm__ __volatile__ ( \
24 "1: movli.l @%2, %0 ! atomic_" #op "\n" \
25 " " #op " %1, %0 \n" \
26 " movco.l %0, @%2 \n" \
29 : "r" (i), "r" (&v->counter) \
33 #define ATOMIC_OP_RETURN(op) \
34 static inline int atomic_##op##_return(int i, atomic_t *v) \
38 __asm__ __volatile__ ( \
39 "1: movli.l @%2, %0 ! atomic_" #op "_return \n" \
40 " " #op " %1, %0 \n" \
41 " movco.l %0, @%2 \n" \
45 : "r" (i), "r" (&v->counter) \
51 #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op)
60 #undef ATOMIC_OP_RETURN
63 #endif /* __ASM_SH_ATOMIC_LLSC_H */