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-rw-r--r--arch/riscv64/atomic_arch.h34
1 files changed, 34 insertions, 0 deletions
diff --git a/arch/riscv64/atomic_arch.h b/arch/riscv64/atomic_arch.h
new file mode 100644
index 00000000..98f12fc7
--- /dev/null
+++ b/arch/riscv64/atomic_arch.h
@@ -0,0 +1,34 @@
+#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__("\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), "+A"(*p)
+ : "r"(t), "r"(s));
+ return old;
+}
+
+#define a_cas_p a_cas_p
+static inline void *a_cas_p(volatile void *p, void *t, void *s)
+{
+ void *old;
+ int tmp;
+ __asm__("\n1: lr.d.aqrl %0, %2\n"
+ " bne %0, %3, 1f\n"
+ " sc.d.aqrl %1, %4, %2\n"
+ " bnez %1, 1b\n"
+ "1:"
+ : "=&r"(old), "+r"(tmp), "+A"(*(long *)p)
+ : "r"(t), "r"(s));
+ return old;
+}