efi_loader: complete efi_pxe_mode struct definition

The efi_pxe_mode struct which represents the PXE_BASE_CODE_PROTOCOL
Replace the placeholder paddings in the efi_pxe_mode struct with the
actual fields as defined in UEFI's PXE Base Code Protocol.  Since
our efi_ip_address is a simple char array set a specific alignment
to the efi_ip_address fields, as expected by the UEFI spec.

Signed-off-by: Patrick Wildt <patrick@blueri.se>
[agraf: s/pxe_discovervalid/pxe_discover_valid]
Signed-off-by: Alexander Graf <agraf@suse.de>

include/efi_api.h

@@ -703,7 +703,7 @@ struct efi_mac_address {
 
 struct efi_ip_address {
 	u8 ip_addr[16];
-};
+} __attribute__((aligned(4)));
 
 enum efi_simple_network_state {
 	EFI_NETWORK_STOPPED,
@@ -797,7 +797,28 @@ struct efi_pxe_packet {
 
 struct efi_pxe_mode
 {
-	u8 unused[52];
+	u8 started;
+	u8 ipv6_available;
+	u8 ipv6_supported;
+	u8 using_ipv6;
+	u8 bis_supported;
+	u8 bis_detected;
+	u8 auto_arp;
+	u8 send_guid;
+	u8 dhcp_discover_valid;
+	u8 dhcp_ack_received;
+	u8 proxy_offer_received;
+	u8 pxe_discover_valid;
+	u8 pxe_reply_received;
+	u8 pxe_bis_reply_received;
+	u8 icmp_error_received;
+	u8 tftp_error_received;
+	u8 make_callbacks;
+	u8 ttl;
+	u8 tos;
+	u8 pad;
+	struct efi_ip_address station_ip;
+	struct efi_ip_address subnet_mask;
 	struct efi_pxe_packet dhcp_discover;
 	struct efi_pxe_packet dhcp_ack;
 	struct efi_pxe_packet proxy_offer;