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diff --git a/qemu/roms/seabios/src/stacks.h b/qemu/roms/seabios/src/stacks.h
new file mode 100644
index 000000000..82c4c3c85
--- /dev/null
+++ b/qemu/roms/seabios/src/stacks.h
@@ -0,0 +1,53 @@
+// Misc function and variable declarations.
+#ifndef __STACKS_H
+#define __STACKS_H
+
+#include "types.h" // u32
+
+#define CALL32SMM_CMDID    0xb5
+#define CALL32SMM_ENTERID  0x1234
+#define CALL32SMM_RETURNID 0x5678
+
+// stacks.c
+extern int HaveSmmCall32;
+u32 call32(void *func, u32 eax, u32 errret);
+extern u8 ExtraStack[], *StackPos;
+u32 stack_hop(u32 eax, u32 edx, void *func);
+u32 stack_hop_back(u32 eax, u32 edx, void *func);
+int on_extra_stack(void);
+struct bregs;
+void farcall16(struct bregs *callregs);
+void farcall16big(struct bregs *callregs);
+void __call16_int(struct bregs *callregs, u16 offset);
+#define call16_int(nr, callregs) do {                           \
+        extern void irq_trampoline_ ##nr ();                    \
+        __call16_int((callregs), (u32)&irq_trampoline_ ##nr );  \
+    } while (0)
+void reset(void);
+extern struct thread_info MainThread;
+struct thread_info *getCurThread(void);
+void yield(void);
+void yield_toirq(void);
+void thread_init(void);
+int threads_during_optionroms(void);
+void run_thread(void (*func)(void*), void *data);
+void wait_threads(void);
+struct mutex_s { u32 isLocked; };
+void mutex_lock(struct mutex_s *mutex);
+void mutex_unlock(struct mutex_s *mutex);
+void start_preempt(void);
+void finish_preempt(void);
+int wait_preempt(void);
+void check_preempt(void);
+u32 call32_params(void *func, u32 eax, u32 edx, u32 ecx, u32 errret);
+
+// Inline functions
+
+// Check if a call to stack_hop_back is needed.
+static inline int
+need_hop_back(void)
+{
+    return !MODESEGMENT || on_extra_stack();
+}
+
+#endif // stacks.h