diff --git a/sys/compat/linuxkpi/common/include/linux/agp_backend.h b/sys/compat/linuxkpi/common/include/linux/agp_backend.h
new file mode 100644
index 000000000000..c855fd842970
--- /dev/null
+++ b/sys/compat/linuxkpi/common/include/linux/agp_backend.h
@@ -0,0 +1,28 @@
+/* Public domain */
+
+#ifndef _LINUXKPI_LINUX_AGP_BACKEND_H_
+#define	_LINUXKPI_LINUX_AGP_BACKEND_H_
+
+#include <sys/types.h>
+
+struct agp_version {
+	uint16_t	major;
+	uint16_t	minor;
+};
+
+struct agp_kern_info {
+	struct agp_version	version;
+	uint16_t		vendor;
+	uint16_t		device;
+	unsigned long		mode;
+	unsigned long		aper_base;
+	size_t			aper_size;
+	int			max_memory;
+	int			current_memory;
+	bool			cant_use_aperture;
+	unsigned long		page_mask;
+};
+
+struct agp_memory;
+
+#endif /* _LINUXKPI_LINUX_AGP_BACKEND_H_ */