/** @file
  It is invoked when the PXE Base Code Protocol is about to transmit, has received, 
  or is waiting to receive a packet.

Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available under 
the terms and conditions of the BSD License that accompanies this distribution.  
The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php.                                          
    
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             

  @par Revision Reference:          
  This Protocol is introduced in EFI Specification 1.10

**/

#ifndef _PXE_BASE_CODE_CALLBACK_H_
#define _PXE_BASE_CODE_CALLBACK_H_

///
/// Call Back Definitions.
///
#define EFI_PXE_BASE_CODE_CALLBACK_PROTOCOL_GUID \
  { \
    0x245dca21, 0xfb7b, 0x11d3, {0x8f, 0x01, 0x00, 0xa0, 0xc9, 0x69, 0x72, 0x3b } \
  }

///
/// UEFI Revision Number Definition.
///
#define EFI_PXE_BASE_CODE_CALLBACK_PROTOCOL_REVISION 0x00010000

///
/// EFI 1.1 Revision Number defintion.
///
#define EFI_PXE_BASE_CODE_CALLBACK_INTERFACE_REVISION  \
        EFI_PXE_BASE_CODE_CALLBACK_PROTOCOL_REVISION

///
/// UEFI Protocol name.
///
typedef struct _EFI_PXE_BASE_CODE_CALLBACK_PROTOCOL  EFI_PXE_BASE_CODE_CALLBACK_PROTOCOL;

///
/// EFI1.1 Protocol name.
/// 
typedef EFI_PXE_BASE_CODE_CALLBACK_PROTOCOL   EFI_PXE_BASE_CODE_CALLBACK;

///
/// Event type list for PXE Base Code Protocol function.
///
typedef enum {
  EFI_PXE_BASE_CODE_FUNCTION_FIRST,
  EFI_PXE_BASE_CODE_FUNCTION_DHCP,
  EFI_PXE_BASE_CODE_FUNCTION_DISCOVER,
  EFI_PXE_BASE_CODE_FUNCTION_MTFTP,
  EFI_PXE_BASE_CODE_FUNCTION_UDP_WRITE,
  EFI_PXE_BASE_CODE_FUNCTION_UDP_READ,
  EFI_PXE_BASE_CODE_FUNCTION_ARP,
  EFI_PXE_BASE_CODE_FUNCTION_IGMP,
  EFI_PXE_BASE_CODE_PXE_FUNCTION_LAST
} EFI_PXE_BASE_CODE_FUNCTION;

///
/// Callback status type.
///
typedef enum {
  EFI_PXE_BASE_CODE_CALLBACK_STATUS_FIRST,
  EFI_PXE_BASE_CODE_CALLBACK_STATUS_CONTINUE,
  EFI_PXE_BASE_CODE_CALLBACK_STATUS_ABORT,
  EFI_PXE_BASE_CODE_CALLBACK_STATUS_LAST
} EFI_PXE_BASE_CODE_CALLBACK_STATUS;

/**                                                                 
  Callback function that is invoked when the PXE Base Code Protocol is about to transmit, has
  received, or is waiting to receive a packet.                                                 
  
  This function is invoked when the PXE Base Code Protocol is about to transmit, has received,
  or is waiting to receive a packet. Parameters Function and Received specify the type of event.
  Parameters PacketLen and Packet specify the packet that generated the event. If these fields
  are zero and NULL respectively, then this is a status update callback. If the operation specified
  by Function is to continue, then CALLBACK_STATUS_CONTINUE should be returned. If the operation
  specified by Function should be aborted, then CALLBACK_STATUS_ABORT should be returned. Due to
  the polling nature of UEFI device drivers, a callback function should not execute for more than 5 ms.
  The SetParameters() function must be called after a Callback Protocol is installed to enable the
  use of callbacks.
  
  @param  This                  The pointer to the EFI_PXE_BASE_CODE_CALLBACK_PROTOCOL instance.
  @param  Function              The PXE Base Code Protocol function that is waiting for an event.                                                              
  @param  Received              TRUE if the callback is being invoked due to a receive event. FALSE if
                                the callback is being invoked due to a transmit event.                
  @param  PacketLen             The length, in bytes, of Packet. This field will have a value of zero if
                                this is a wait for receive event.                                       
  @param  Packet                If Received is TRUE, a pointer to the packet that was just received;
                                otherwise a pointer to the packet that is about to be transmitted.  
                                  
  @retval EFI_PXE_BASE_CODE_CALLBACK_STATUS_CONTINUE if Function specifies a continue operation    
  @retval EFI_PXE_BASE_CODE_CALLBACK_STATUS_ABORT    if Function specifies an abort operation
                                   
**/
typedef 
EFI_PXE_BASE_CODE_CALLBACK_STATUS 
(EFIAPI *EFI_PXE_CALLBACK)(
  IN EFI_PXE_BASE_CODE_CALLBACK_PROTOCOL  *This,
  IN EFI_PXE_BASE_CODE_FUNCTION           Function,
  IN BOOLEAN                              Received,
  IN UINT32                               PacketLen,
  IN EFI_PXE_BASE_CODE_PACKET             *Packet     OPTIONAL
  );

///
/// Protocol that is invoked when the PXE Base Code Protocol is about 
/// to transmit, has received, or is waiting to receive a packet.
///
struct _EFI_PXE_BASE_CODE_CALLBACK_PROTOCOL {
  ///
  ///  The revision of the EFI_PXE_BASE_CODE_PROTOCOL. All future revisions must 
  ///  be backwards compatible. If a future version is not backwards compatible 
  ///  it is not the same GUID.
  ///
  UINT64            Revision;
  EFI_PXE_CALLBACK  Callback;
};

extern EFI_GUID gEfiPxeBaseCodeCallbackProtocolGuid;

#endif