text: #ifndef _GPXE_ARP_H
  #define _GPXE_ARP_H
  
  /** @file
   *
   * Address Resolution Protocol
   *
   */
  
  FILE_LICENCE ( GPL2_OR_LATER );
  
  #include <gpxe/tables.h>
  
  struct net_device;
  struct net_protocol;
  
  /** A network-layer protocol that relies upon ARP */
  struct arp_net_protocol {
  	/** Network-layer protocol */
  	struct net_protocol *net_protocol;
  	/** Check existence of address
  	 *
  	 * @v netdev	Network device
  	 * @v net_addr	Network-layer address
  	 * @ret rc	Return status code
  	 */
  	int ( * check ) ( struct net_device *netdev,
  			  const void *net_addr );
  };
  
  /** ARP protocol table */
  #define ARP_NET_PROTOCOLS \
  	__table ( struct arp_net_protocol, "arp_net_protocols" )
  
  /** Declare an ARP protocol */
  #define __arp_net_protocol __table_entry ( ARP_NET_PROTOCOLS, 01 )
  
  extern struct net_protocol arp_protocol;
  
  extern int arp_resolve ( struct net_device *netdev,
  			 struct net_protocol *net_protocol,
  			 const void *dest_net_addr,
  			 const void *source_net_addr,
  			 void *dest_ll_addr );
  
  #endif /* _GPXE_ARP_H */
  