diff --git a/include/asm-um/highmem.h b/include/asm-um/highmem.h
new file mode 100644
index 0000000..36974cb
--- /dev/null
+++ b/include/asm-um/highmem.h
@@ -0,0 +1,12 @@
+#ifndef __UM_HIGHMEM_H
+#define __UM_HIGHMEM_H
+
+#include "asm/page.h"
+#include "asm/fixmap.h"
+#include "asm/arch/highmem.h"
+
+#undef PKMAP_BASE
+
+#define PKMAP_BASE ((FIXADDR_START - LAST_PKMAP * PAGE_SIZE) & PMD_MASK)
+
+#endif