Initial version

1 files changed, 38 insertions, 0 deletions

diff --git a/arch/powerpc/atomic_arch.h b/arch/powerpc/atomic_arch.h
new file mode 100644
index 0000000..c267391
--- /dev/null
+++ b/arch/powerpc/atomic_arch.h
@@ -0,0 +1,38 @@
+#define a_ll a_ll
+static inline int a_ll(volatile int *p)
+{
+	int v;
+	__asm__ __volatile__ ("lwarx %0, 0, %2" : "=r"(v) : "m"(*p), "r"(p));
+	return v;
+}
+
+#define a_sc a_sc
+static inline int a_sc(volatile int *p, int v)
+{
+	int r;
+	__asm__ __volatile__ (
+		"stwcx. %2, 0, %3 ; mfcr %0"
+		: "=r"(r), "=m"(*p) : "r"(v), "r"(p) : "memory", "cc");
+	return r & 0x20000000; /* "bit 2" of "cr0" (backwards bit order) */
+}
+
+#define a_barrier a_barrier
+static inline void a_barrier()
+{
+	__asm__ __volatile__ ("sync" : : : "memory");
+}
+
+#define a_pre_llsc a_barrier
+
+#define a_post_llsc a_post_llsc
+static inline void a_post_llsc()
+{
+	__asm__ __volatile__ ("isync" : : : "memory");
+}
+
+#define a_clz_32 a_clz_32
+static inline int a_clz_32(uint32_t x)
+{
+	__asm__ ("cntlzw %0, %1" : "=r"(x) : "r"(x));
+	return x;
+}