v4.19.13 snapshot.
diff --git a/arch/x86/realmode/rm/stack.S b/arch/x86/realmode/rm/stack.S
new file mode 100644
index 0000000..8d4cb64
--- /dev/null
+++ b/arch/x86/realmode/rm/stack.S
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Common heap and stack allocations
+ */
+
+#include <linux/linkage.h>
+
+	.data
+GLOBAL(HEAP)
+	.long	rm_heap
+GLOBAL(heap_end)
+	.long	rm_stack
+
+	.bss
+	.balign	16
+GLOBAL(rm_heap)
+	.space	2048
+GLOBAL(rm_stack)
+	.space	2048
+GLOBAL(rm_stack_end)