Import of Linux/MIPS 2.1.14

1 files changed, 42 insertions, 0 deletions

diff --git a/include/asm-m68k/atomic.h b/include/asm-m68k/atomic.h
new file mode 100644
index 000000000..8ea909203
--- /dev/null
+++ b/include/asm-m68k/atomic.h
@@ -0,0 +1,42 @@
+#ifndef __ARCH_M68K_ATOMIC__
+#define __ARCH_M68K_ATOMIC__
+
+/*
+ * Atomic operations that C can't guarantee us.  Useful for
+ * resource counting etc..
+ */
+
+/*
+ * We do not have SMP m68k systems, so we don't have to deal with that.
+ */
+
+typedef int atomic_t;
+
+static __inline__ void atomic_add(atomic_t i, atomic_t *v)
+{
+	__asm__ __volatile__("addl %1,%0" : : "m" (*v), "id" (i));
+}
+
+static __inline__ void atomic_sub(atomic_t i, atomic_t *v)
+{
+	__asm__ __volatile__("subl %1,%0" : : "m" (*v), "id" (i));
+}
+
+static __inline__ void atomic_inc(atomic_t *v)
+{
+	__asm__ __volatile__("addql #1,%0" : : "m" (*v));
+}
+
+static __inline__ void atomic_dec(atomic_t *v)
+{
+	__asm__ __volatile__("subql #1,%0" : : "m" (*v));
+}
+
+static __inline__ int atomic_dec_and_test(atomic_t *v)
+{
+	char c;
+	__asm__ __volatile__("subql #1,%1; seq %0" : "=d" (c) : "m" (*v));
+	return c != 0;
+}
+
+#endif /* __ARCH_M68K_ATOMIC __ */