1 files changed, 53 insertions, 0 deletions
diff --git a/src/include/smp/atomic.h b/src/include/smp/atomic.h
new file mode 100644
index 0000000000..b36e0e2051
--- /dev/null
+++ b/src/include/smp/atomic.h
@@ -0,0 +1,53 @@
+#ifndef SMP_ATOMIC_H
+#define SMP_ATOMIC_H
+
+#ifdef SMP
+#include <arch/smp/atomic.h>
+#else
+
+typedef struct { int counter; } atomic_t;
+#define ATOMIC_INIT(i) { (i) }
+
+/**
+ * atomic_read - read atomic variable
+ * @v: pointer of type atomic_t
+ * 
+ * Atomically reads the value of @v.  Note that the guaranteed
+ * useful range of an atomic_t is only 24 bits.
+ */ 
+#define atomic_read(v)		((v)->counter)
+
+/**
+ * atomic_set - set atomic variable
+ * @v: pointer of type atomic_t
+ * @i: required value
+ * 
+ * Atomically sets the value of @v to @i.  Note that the guaranteed
+ * useful range of an atomic_t is only 24 bits.
+ */ 
+#define atomic_set(v,i)		(((v)->counter) = (i))
+
+
+/**
+ * atomic_inc - increment atomic variable
+ * @v: pointer of type atomic_t
+ * 
+ * Atomically increments @v by 1.  Note that the guaranteed
+ * useful range of an atomic_t is only 24 bits.
+ */ 
+#define atomic_inc(v)	(((v)->counter)++)
+
+
+/**
+ * atomic_dec - decrement atomic variable
+ * @v: pointer of type atomic_t
+ * 
+ * Atomically decrements @v by 1.  Note that the guaranteed
+ * useful range of an atomic_t is only 24 bits.
+ */ 
+#define atomic_dec(v)	(((v)->counter)--)
+
+
+#endif /* SMP */
+
+#endif /* SMP_ATOMIC_H */