1 files changed, 38 insertions, 0 deletions
diff --git a/sys/linux/riscv64/arch/atomic.h b/sys/linux/riscv64/arch/atomic.h
new file mode 100644
index 0000000..95db16d
--- /dev/null
+++ b/sys/linux/riscv64/arch/atomic.h
@@ -0,0 +1,38 @@
+static inline void
+atomic·barrier()
+{
+	__asm__ __volatile__ ("fence rw,rw" : : : "memory");
+}
+
+static inline int
+atomic·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;
+}
+
+static inline void
+*atomic·casp(volatile void *p, void *t, void *s)
+{
+	void *old;
+	int tmp;
+	__asm__ __volatile__ (
+		"\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)
+		: "r"(p), "r"(t), "r"(s)
+		: "memory");
+	return old;
+}