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- /* SPDX-License-Identifier: GPL-2.0 */
- /*
- * Atomic operations (LLSC).
- *
- * Copyright (C) 2024-2025 Loongson Technology Corporation Limited
- */
- #ifndef _ASM_ATOMIC_LLSC_H
- #define _ASM_ATOMIC_LLSC_H
- #include <linux/types.h>
- #include <asm/barrier.h>
- #include <asm/cmpxchg.h>
- #define ATOMIC_OP(op, I, asm_op) \
- static inline void arch_atomic_##op(int i, atomic_t *v) \
- { \
- int temp; \
- \
- __asm__ __volatile__( \
- "1: ll.w %0, %1 #atomic_" #op " \n" \
- " " #asm_op " %0, %0, %2 \n" \
- " sc.w %0, %1 \n" \
- " beq %0, $r0, 1b \n" \
- :"=&r" (temp) , "+ZC"(v->counter) \
- :"r" (I) \
- ); \
- }
- #define ATOMIC_OP_RETURN(op, I, asm_op) \
- static inline int arch_atomic_##op##_return_relaxed(int i, atomic_t *v) \
- { \
- int result, temp; \
- \
- __asm__ __volatile__( \
- "1: ll.w %1, %2 # atomic_" #op "_return \n" \
- " " #asm_op " %0, %1, %3 \n" \
- " sc.w %0, %2 \n" \
- " beq %0, $r0 ,1b \n" \
- " " #asm_op " %0, %1, %3 \n" \
- : "=&r" (result), "=&r" (temp), "+ZC"(v->counter) \
- : "r" (I)); \
- \
- return result; \
- }
- #define ATOMIC_FETCH_OP(op, I, asm_op) \
- static inline int arch_atomic_fetch_##op##_relaxed(int i, atomic_t *v) \
- { \
- int result, temp; \
- \
- __asm__ __volatile__( \
- "1: ll.w %1, %2 # atomic_fetch_" #op " \n" \
- " " #asm_op " %0, %1, %3 \n" \
- " sc.w %0, %2 \n" \
- " beq %0, $r0 ,1b \n" \
- " add.w %0, %1 ,$r0 \n" \
- : "=&r" (result), "=&r" (temp), "+ZC" (v->counter) \
- : "r" (I)); \
- \
- return result; \
- }
- #define ATOMIC_OPS(op,I ,asm_op, c_op) \
- ATOMIC_OP(op, I, asm_op) \
- ATOMIC_OP_RETURN(op, I , asm_op) \
- ATOMIC_FETCH_OP(op, I, asm_op)
- ATOMIC_OPS(add, i , add.w ,+=)
- ATOMIC_OPS(sub, -i , add.w ,+=)
- #define arch_atomic_add_return_relaxed arch_atomic_add_return_relaxed
- #define arch_atomic_sub_return_relaxed arch_atomic_sub_return_relaxed
- #define arch_atomic_fetch_add_relaxed arch_atomic_fetch_add_relaxed
- #define arch_atomic_fetch_sub_relaxed arch_atomic_fetch_sub_relaxed
- #undef ATOMIC_OPS
- #define ATOMIC_OPS(op, I, asm_op) \
- ATOMIC_OP(op, I, asm_op) \
- ATOMIC_FETCH_OP(op, I, asm_op)
- ATOMIC_OPS(and, i, and)
- ATOMIC_OPS(or, i, or)
- ATOMIC_OPS(xor, i, xor)
- #define arch_atomic_fetch_and_relaxed arch_atomic_fetch_and_relaxed
- #define arch_atomic_fetch_or_relaxed arch_atomic_fetch_or_relaxed
- #define arch_atomic_fetch_xor_relaxed arch_atomic_fetch_xor_relaxed
- #undef ATOMIC_OPS
- #undef ATOMIC_FETCH_OP
- #undef ATOMIC_OP_RETURN
- #undef ATOMIC_OP
- #ifdef CONFIG_64BIT
- #error "64-bit LLSC atomic operations are not supported"
- #endif
- #endif /* _ASM_ATOMIC_LLSC_H */
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