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diff --git a/kitten/include/lwk/percpu.h b/kitten/include/lwk/percpu.h
new file mode 100644
index 0000000..2e31649
--- /dev/null
+++ b/kitten/include/lwk/percpu.h
@@ -0,0 +1,39 @@
+#ifndef _LWK_PERCPU_H
+#define _LWK_PERCPU_H
+#include <lwk/smp.h>
+#include <lwk/string.h>
+#include <arch/percpu.h>
+
+/* Enough to cover all DEFINE_PER_CPU()'s in kernel. */
+#ifndef PERCPU_ENOUGH_ROOM
+#define PERCPU_ENOUGH_ROOM 32768
+#endif
+
+/* Must be an lvalue. */
+#define get_cpu_var(var) __get_cpu_var(var)
+#define put_cpu_var(var) 
+
+struct percpu_data {
+	void *ptrs[NR_CPUS];
+};
+
+/* 
+ * Use this to get to a cpu's version of the per-cpu object allocated using
+ * alloc_percpu.  Non-atomic access to the current CPU's version should
+ * probably be combined with get_cpu()/put_cpu().
+ */ 
+#define per_cpu_ptr(ptr, cpu)                   \
+({                                              \
+        struct percpu_data *__p = (struct percpu_data *)~(unsigned long)(ptr); \
+        (__typeof__(ptr))__p->ptrs[(cpu)];	\
+})
+
+extern void *__alloc_percpu(size_t size);
+extern void free_percpu(const void *);
+
+/* Simple wrapper for the common case: zeros memory. */
+#define alloc_percpu(type)	((type *)(__alloc_percpu(sizeof(type))))
+
+extern void setup_per_cpu_areas(void);
+
+#endif /* _LWK_PERCPU_H */