Initial version

1 files changed, 58 insertions, 0 deletions

diff --git a/arch/mips/atomic_arch.h b/arch/mips/atomic_arch.h
new file mode 100644
index 0000000..1248d17
--- /dev/null
+++ b/arch/mips/atomic_arch.h
@@ -0,0 +1,58 @@
+#if __mips_isa_rev < 6
+#define LLSC_M "m"
+#else
+#define LLSC_M "ZC"
+#endif
+
+#define a_ll a_ll
+static inline int a_ll(volatile int *p)
+{
+	int v;
+#if __mips < 2
+	__asm__ __volatile__ (
+		".set push ; .set mips2\n\t"
+		"ll %0, %1"
+		"\n\t.set pop"
+		: "=r"(v) : "m"(*p));
+#else
+	__asm__ __volatile__ (
+		"ll %0, %1"
+		: "=r"(v) : LLSC_M(*p));
+#endif
+	return v;
+}
+
+#define a_sc a_sc
+static inline int a_sc(volatile int *p, int v)
+{
+	int r;
+#if __mips < 2
+	__asm__ __volatile__ (
+		".set push ; .set mips2\n\t"
+		"sc %0, %1"
+		"\n\t.set pop"
+		: "=r"(r), "=m"(*p) : "0"(v) : "memory");
+#else
+	__asm__ __volatile__ (
+		"sc %0, %1"
+		: "=r"(r), "="LLSC_M(*p) : "0"(v) : "memory");
+#endif
+	return r;
+}
+
+#define a_barrier a_barrier
+static inline void a_barrier()
+{
+#if __mips < 2
+	/* mips2 sync, but using too many directives causes
+	 * gcc not to inline it, so encode with .long instead. */
+	__asm__ __volatile__ (".long 0xf" : : : "memory");
+#else
+	__asm__ __volatile__ ("sync" : : : "memory");
+#endif
+}
+
+#define a_pre_llsc a_barrier
+#define a_post_llsc a_barrier
+
+#undef LLSC_M