From 4abab5ad6c8465a7528ccdd5f49367da05f78bbd Mon Sep 17 00:00:00 2001 From: Vladimir Azarov Date: Tue, 1 Oct 2024 15:47:05 +0200 Subject: Initial version --- arch/riscv32/atomic_arch.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 arch/riscv32/atomic_arch.h (limited to 'arch/riscv32/atomic_arch.h') diff --git a/arch/riscv32/atomic_arch.h b/arch/riscv32/atomic_arch.h new file mode 100644 index 0000000..4d418f6 --- /dev/null +++ b/arch/riscv32/atomic_arch.h @@ -0,0 +1,21 @@ +#define a_barrier a_barrier +static inline void a_barrier() +{ + __asm__ __volatile__ ("fence rw,rw" : : : "memory"); +} + +#define a_cas a_cas +static inline int a_cas(volatile int *p, int t, int s) +{ + int old, tmp; + __asm__ __volatile__ ( + "\n1: lr.w.aqrl %0, (%2)\n" + " bne %0, %3, 1f\n" + " sc.w.aqrl %1, %4, (%2)\n" + " bnez %1, 1b\n" + "1:" + : "=&r"(old), "=&r"(tmp) + : "r"(p), "r"((long)t), "r"((long)s) + : "memory"); + return old; +} -- cgit v1.2.3