Viewing file:  atomic-llsc.h (2.71 KB) -rw-r--r--
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/* 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
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