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Diffstat (limited to '')
| -rw-r--r-- | arch/arc/include/asm/atomic-llsc.h | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/arch/arc/include/asm/atomic-llsc.h b/arch/arc/include/asm/atomic-llsc.h new file mode 100644 index 0000000000..5258cb81a1 --- /dev/null +++ b/arch/arc/include/asm/atomic-llsc.h @@ -0,0 +1,97 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#ifndef _ASM_ARC_ATOMIC_LLSC_H +#define _ASM_ARC_ATOMIC_LLSC_H + +#define arch_atomic_set(v, i) WRITE_ONCE(((v)->counter), (i)) + +#define ATOMIC_OP(op, asm_op) \ +static inline void arch_atomic_##op(int i, atomic_t *v) \ +{ \ + unsigned int val; \ + \ + __asm__ __volatile__( \ + "1: llock %[val], [%[ctr]] \n" \ + " " #asm_op " %[val], %[val], %[i] \n" \ + " scond %[val], [%[ctr]] \n" \ + " bnz 1b \n" \ + : [val] "=&r" (val) /* Early clobber to prevent reg reuse */ \ + : [ctr] "r" (&v->counter), /* Not "m": llock only supports reg direct addr mode */ \ + [i] "ir" (i) \ + : "cc", "memory"); \ +} \ + +#define ATOMIC_OP_RETURN(op, asm_op) \ +static inline int arch_atomic_##op##_return_relaxed(int i, atomic_t *v) \ +{ \ + unsigned int val; \ + \ + __asm__ __volatile__( \ + "1: llock %[val], [%[ctr]] \n" \ + " " #asm_op " %[val], %[val], %[i] \n" \ + " scond %[val], [%[ctr]] \n" \ + " bnz 1b \n" \ + : [val] "=&r" (val) \ + : [ctr] "r" (&v->counter), \ + [i] "ir" (i) \ + : "cc", "memory"); \ + \ + return val; \ +} + +#define arch_atomic_add_return_relaxed arch_atomic_add_return_relaxed +#define arch_atomic_sub_return_relaxed arch_atomic_sub_return_relaxed + +#define ATOMIC_FETCH_OP(op, asm_op) \ +static inline int arch_atomic_fetch_##op##_relaxed(int i, atomic_t *v) \ +{ \ + unsigned int val, orig; \ + \ + __asm__ __volatile__( \ + "1: llock %[orig], [%[ctr]] \n" \ + " " #asm_op " %[val], %[orig], %[i] \n" \ + " scond %[val], [%[ctr]] \n" \ + " bnz 1b \n" \ + : [val] "=&r" (val), \ + [orig] "=&r" (orig) \ + : [ctr] "r" (&v->counter), \ + [i] "ir" (i) \ + : "cc", "memory"); \ + \ + return orig; \ +} + +#define arch_atomic_fetch_add_relaxed arch_atomic_fetch_add_relaxed +#define arch_atomic_fetch_sub_relaxed arch_atomic_fetch_sub_relaxed + +#define arch_atomic_fetch_and_relaxed arch_atomic_fetch_and_relaxed +#define arch_atomic_fetch_andnot_relaxed arch_atomic_fetch_andnot_relaxed +#define arch_atomic_fetch_or_relaxed arch_atomic_fetch_or_relaxed +#define arch_atomic_fetch_xor_relaxed arch_atomic_fetch_xor_relaxed + +#define ATOMIC_OPS(op, asm_op) \ + ATOMIC_OP(op, asm_op) \ + ATOMIC_OP_RETURN(op, asm_op) \ + ATOMIC_FETCH_OP(op, asm_op) + +ATOMIC_OPS(add, add) +ATOMIC_OPS(sub, sub) + +#undef ATOMIC_OPS +#define ATOMIC_OPS(op, asm_op) \ + ATOMIC_OP(op, asm_op) \ + ATOMIC_FETCH_OP(op, asm_op) + +ATOMIC_OPS(and, and) +ATOMIC_OPS(andnot, bic) +ATOMIC_OPS(or, or) +ATOMIC_OPS(xor, xor) + +#define arch_atomic_andnot arch_atomic_andnot + +#undef ATOMIC_OPS +#undef ATOMIC_FETCH_OP +#undef ATOMIC_OP_RETURN +#undef ATOMIC_OP + +#endif |