Select a PXE network device before starting PXE NBP.

Move pxe_boot() code to pxe_image.c

src/arch/i386/include/pxe_call.h

@@ -6,6 +6,19 @@
  * PXE API entry point
  */
 
-extern int pxe_boot ( void );
+#include <pxe_api.h>
+#include <realmode.h>
+
+/** !PXE structure */
+extern struct s_PXE __text16 ( ppxe );
+#define ppxe __use_text16 ( ppxe )
+
+/** PXENV+ structure */
+extern struct s_PXENV __text16 ( pxenv );
+#define pxenv __use_text16 ( pxenv )
+
+extern void pxe_hook_int1a ( void );
+extern int pxe_unhook_int1a ( void );
+extern void pxe_init_structures ( void );
 
 #endif /* _PXE_CALL_H */