Initial version

1 files changed, 82 insertions, 0 deletions

diff --git a/arch/aarch64/atomic_arch.h b/arch/aarch64/atomic_arch.h
new file mode 100644
index 0000000..40fefc2
--- /dev/null
+++ b/arch/aarch64/atomic_arch.h
@@ -0,0 +1,82 @@
+#define a_ll a_ll
+static inline int a_ll(volatile int *p)
+{
+	int v;
+	__asm__ __volatile__ ("ldaxr %w0,%1" : "=r"(v) : "Q"(*p));
+	return v;
+}
+
+#define a_sc a_sc
+static inline int a_sc(volatile int *p, int v)
+{
+	int r;
+	__asm__ __volatile__ ("stlxr %w0,%w2,%1" : "=&r"(r), "=Q"(*p) : "r"(v) : "memory");
+	return !r;
+}
+
+#define a_barrier a_barrier
+static inline void a_barrier()
+{
+	__asm__ __volatile__ ("dmb ish" : : : "memory");
+}
+
+#define a_cas a_cas
+static inline int a_cas(volatile int *p, int t, int s)
+{
+	int old;
+	do {
+		old = a_ll(p);
+		if (old != t) {
+			a_barrier();
+			break;
+		}
+	} while (!a_sc(p, s));
+	return old;
+}
+
+#define a_ll_p a_ll_p
+static inline void *a_ll_p(volatile void *p)
+{
+	void *v;
+	__asm__ __volatile__ ("ldaxr %0, %1" : "=r"(v) : "Q"(*(void *volatile *)p));
+	return v;
+}
+
+#define a_sc_p a_sc_p
+static inline int a_sc_p(volatile int *p, void *v)
+{
+	int r;
+	__asm__ __volatile__ ("stlxr %w0,%2,%1" : "=&r"(r), "=Q"(*(void *volatile *)p) : "r"(v) : "memory");
+	return !r;
+}
+
+#define a_cas_p a_cas_p
+static inline void *a_cas_p(volatile void *p, void *t, void *s)
+{
+	void *old;
+	do {
+		old = a_ll_p(p);
+		if (old != t) {
+			a_barrier();
+			break;
+		}
+	} while (!a_sc_p(p, s));
+	return old;
+}
+
+#define a_ctz_64 a_ctz_64
+static inline int a_ctz_64(uint64_t x)
+{
+	__asm__(
+		"	rbit %0, %1\n"
+		"	clz %0, %0\n"
+		: "=r"(x) : "r"(x));
+	return x;
+}
+
+#define a_clz_64 a_clz_64
+static inline int a_clz_64(uint64_t x)
+{
+	__asm__("clz %0, %1" : "=r"(x) : "r"(x));
+	return x;
+}