diff --git a/src/include/pxe_internal.h b/src/include/pxe_internal.h
new file mode 100644
index 000000000..7a89d5d94
--- /dev/null
+++ b/src/include/pxe_internal.h
@@ -0,0 +1,88 @@
+#ifndef PXE_INTERNAL_H
+#define PXE_INTERNAL_H
+
+/* Union used for PXE API calls; we don't know the type of the
+ * structure until we interpret the opcode.  Also, Status is available
+ * in the same location for any opcode, and it's convenient to have
+ * non-specific access to it.
+ */
+union u_PXENV_ANY {
+	/* Make it easy to read status for any operation */
+	PXENV_STATUS_t				Status;
+	struct s_PXENV_UNLOAD_STACK		unload_stack;
+	struct s_PXENV_GET_CACHED_INFO		get_cached_info;
+	struct s_PXENV_RESTART_TFTP		restart_tftp;
+	struct s_PXENV_START_UNDI		start_undi;
+	struct s_PXENV_STOP_UNDI		stop_undi;
+	struct s_PXENV_START_BASE		start_base;
+	struct s_PXENV_STOP_BASE		stop_base;
+	struct s_PXENV_TFTP_OPEN		tftp_open;
+	struct s_PXENV_TFTP_CLOSE		tftp_close;
+	struct s_PXENV_TFTP_READ		tftp_read;
+	struct s_PXENV_TFTP_READ_FILE		tftp_read_file;
+	struct s_PXENV_TFTP_GET_FSIZE		tftp_get_fsize;
+	struct s_PXENV_UDP_OPEN			udp_open;
+	struct s_PXENV_UDP_CLOSE		udp_close;
+	struct s_PXENV_UDP_WRITE		udp_write;
+	struct s_PXENV_UDP_READ			udp_read;
+	struct s_PXENV_UNDI_STARTUP		undi_startup;
+	struct s_PXENV_UNDI_CLEANUP		undi_cleanup;
+	struct s_PXENV_UNDI_INITIALIZE		undi_initialize;
+	struct s_PXENV_UNDI_RESET_ADAPTER	undi_reset_adapter;
+	struct s_PXENV_UNDI_SHUTDOWN		undi_shutdown;
+	struct s_PXENV_UNDI_OPEN		undi_open;
+	struct s_PXENV_UNDI_CLOSE		undi_close;
+	struct s_PXENV_UNDI_TRANSMIT		undi_transmit;
+	struct s_PXENV_UNDI_SET_MCAST_ADDRESS	undi_set_mcast_address;
+	struct s_PXENV_UNDI_SET_STATION_ADDRESS undi_set_station_address;
+	struct s_PXENV_UNDI_SET_PACKET_FILTER	undi_set_packet_filter;
+	struct s_PXENV_UNDI_GET_INFORMATION	undi_get_information;
+	struct s_PXENV_UNDI_GET_STATISTICS	undi_get_statistics;
+	struct s_PXENV_UNDI_CLEAR_STATISTICS	undi_clear_statistics;
+	struct s_PXENV_UNDI_INITIATE_DIAGS	undi_initiate_diags;
+	struct s_PXENV_UNDI_FORCE_INTERRUPT	undi_force_interrupt;
+	struct s_PXENV_UNDI_GET_MCAST_ADDRESS	undi_get_mcast_address;
+	struct s_PXENV_UNDI_GET_NIC_TYPE	undi_get_nic_type;
+	struct s_PXENV_UNDI_GET_IFACE_INFO	undi_get_iface_info;
+	struct s_PXENV_UNDI_GET_STATE		undi_get_state;
+	struct s_PXENV_UNDI_ISR			undi_isr;
+};
+
+typedef union u_PXENV_ANY PXENV_ANY_t;
+
+/* PXE stack status indicator.  See pxe_export.c for further
+ * explanation.
+ */
+typedef enum {
+	CAN_UNLOAD = 0,
+	MIDWAY,
+	READY
+} pxe_stack_state_t;
+
+/* Data structures installed as part of a PXE stack.  Architectures
+ * will have extra information to append to the end of this.
+ */
+#define PXE_TFTP_MAGIC_COOKIE ( ( 'P'<<24 ) | ( 'x'<<16 ) | ( 'T'<<8 ) | 'f' )
+typedef struct {
+	pxe_t		pxe	__attribute__ ((aligned(16)));
+	pxenv_t		pxenv	__attribute__ ((aligned(16)));
+	pxe_stack_state_t state;
+	union {
+		BOOTPLAYER	cached_info;
+		char		packet[ETH_FRAME_LEN];
+		struct {
+			uint32_t magic_cookie;
+			unsigned int len;
+			int eof;
+			char data[TFTP_MAX_PACKET];
+		} tftpdata;
+		struct {
+			char *buffer;
+			uint32_t offset;
+			uint32_t bufferlen;
+		} readfile;
+	};
+	struct {}	arch_data __attribute__ ((aligned(16)));
+} pxe_stack_t;
+
+#endif /* PXE_INTERNAL_H */