diff --git a/include/asm-blackfin/l1layout.h b/include/asm-blackfin/l1layout.h
new file mode 100644
index 0000000..c13ded7
--- /dev/null
+++ b/include/asm-blackfin/l1layout.h
@@ -0,0 +1,31 @@
+/*
+ * l1layout.h
+ * Defines a layout of L1 scratchpad memory that userspace can rely on.
+ */
+
+#ifndef _L1LAYOUT_H_
+#define _L1LAYOUT_H_
+
+#include <asm/blackfin.h>
+
+#ifndef __ASSEMBLY__
+
+/* Data that is "mapped" into the process VM at the start of the L1 scratch
+   memory, so that each process can access it at a fixed address.  Used for
+   stack checking.  */
+struct l1_scratch_task_info
+{
+	/* Points to the start of the stack.  */
+	void *stack_start;
+	/* Not updated by the kernel; a user process can modify this to
+	   keep track of the lowest address of the stack pointer during its
+	   runtime.  */
+	void *lowest_sp;
+};
+
+/* A pointer to the structure in memory.  */
+#define L1_SCRATCH_TASK_INFO ((struct l1_scratch_task_info *)L1_SCRATCH_START)
+
+#endif
+
+#endif