/** @file
  EFI PXE Base Code Protocol definitions, which is used to access PXE-compatible 
  devices for network access and network booting.

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_PROTOCOL_H__
#define __PXE_BASE_CODE_PROTOCOL_H__

///
/// PXE Base Code protocol.
///
#define EFI_PXE_BASE_CODE_PROTOCOL_GUID \
  { \
    0x03c4e603, 0xac28, 0x11d3, {0x9a, 0x2d, 0x00, 0x90, 0x27, 0x3f, 0xc1, 0x4d } \
  }

typedef struct _EFI_PXE_BASE_CODE_PROTOCOL  EFI_PXE_BASE_CODE_PROTOCOL;

///
/// Protocol defined in EFI1.1.
/// 
typedef EFI_PXE_BASE_CODE_PROTOCOL  EFI_PXE_BASE_CODE;

///
/// Default IP TTL and ToS.
///
#define DEFAULT_TTL 16
#define DEFAULT_ToS 0

///
/// ICMP error format.
///
typedef struct {
  UINT8   Type;
  UINT8   Code;
  UINT16  Checksum;
  union {
    UINT32  reserved;
    UINT32  Mtu;
    UINT32  Pointer;
    struct {
      UINT16  Identifier;
      UINT16  Sequence;
    } Echo;
  } u;
  UINT8 Data[494];
} EFI_PXE_BASE_CODE_ICMP_ERROR;

///
/// TFTP error format.
///
typedef struct {
  UINT8 ErrorCode;
  CHAR8 ErrorString[127];
} EFI_PXE_BASE_CODE_TFTP_ERROR;

///
/// IP Receive Filter definitions.
///
#define EFI_PXE_BASE_CODE_MAX_IPCNT 8

///
/// IP Receive Filter structure.
///
typedef struct {
  UINT8           Filters;
  UINT8           IpCnt;
  UINT16          reserved;
  EFI_IP_ADDRESS  IpList[EFI_PXE_BASE_CODE_MAX_IPCNT];
} EFI_PXE_BASE_CODE_IP_FILTER;

#define EFI_PXE_BASE_CODE_IP_FILTER_STATION_IP            0x0001
#define EFI_PXE_BASE_CODE_IP_FILTER_BROADCAST             0x0002
#define EFI_PXE_BASE_CODE_IP_FILTER_PROMISCUOUS           0x0004
#define EFI_PXE_BASE_CODE_IP_FILTER_PROMISCUOUS_MULTICAST 0x0008

///
/// ARP cache entries.
///
typedef struct {
  EFI_IP_ADDRESS  IpAddr;
  EFI_MAC_ADDRESS MacAddr;
} EFI_PXE_BASE_CODE_ARP_ENTRY;

///
/// ARP route table entries.
///
typedef struct {
  EFI_IP_ADDRESS  IpAddr;
  EFI_IP_ADDRESS  SubnetMask;
  EFI_IP_ADDRESS  GwAddr;
} EFI_PXE_BASE_CODE_ROUTE_ENTRY;

//
// UDP definitions
//
typedef UINT16  EFI_PXE_BASE_CODE_UDP_PORT;

#define EFI_PXE_BASE_CODE_UDP_OPFLAGS_ANY_SRC_IP    0x0001
#define EFI_PXE_BASE_CODE_UDP_OPFLAGS_ANY_SRC_PORT  0x0002
#define EFI_PXE_BASE_CODE_UDP_OPFLAGS_ANY_DEST_IP   0x0004
#define EFI_PXE_BASE_CODE_UDP_OPFLAGS_ANY_DEST_PORT 0x0008
#define EFI_PXE_BASE_CODE_UDP_OPFLAGS_USE_FILTER    0x0010
#define EFI_PXE_BASE_CODE_UDP_OPFLAGS_MAY_FRAGMENT  0x0020

//
// Discover() definitions
//
#define EFI_PXE_BASE_CODE_BOOT_TYPE_BOOTSTRAP         0
#define EFI_PXE_BASE_CODE_BOOT_TYPE_MS_WINNT_RIS      1
#define EFI_PXE_BASE_CODE_BOOT_TYPE_INTEL_LCM         2
#define EFI_PXE_BASE_CODE_BOOT_TYPE_DOSUNDI           3
#define EFI_PXE_BASE_CODE_BOOT_TYPE_NEC_ESMPRO        4
#define EFI_PXE_BASE_CODE_BOOT_TYPE_IBM_WSoD          5
#define EFI_PXE_BASE_CODE_BOOT_TYPE_IBM_LCCM          6
#define EFI_PXE_BASE_CODE_BOOT_TYPE_CA_UNICENTER_TNG  7
#define EFI_PXE_BASE_CODE_BOOT_TYPE_HP_OPENVIEW       8
#define EFI_PXE_BASE_CODE_BOOT_TYPE_ALTIRIS_9         9
#define EFI_PXE_BASE_CODE_BOOT_TYPE_ALTIRIS_10        10
#define EFI_PXE_BASE_CODE_BOOT_TYPE_ALTIRIS_11        11
#define EFI_PXE_BASE_CODE_BOOT_TYPE_NOT_USED_12       12
#define EFI_PXE_BASE_CODE_BOOT_TYPE_REDHAT_INSTALL    13
#define EFI_PXE_BASE_CODE_BOOT_TYPE_REDHAT_BOOT       14
#define EFI_PXE_BASE_CODE_BOOT_TYPE_REMBO             15
#define EFI_PXE_BASE_CODE_BOOT_TYPE_BEOBOOT           16
//
// 17 through 32767 are reserved
// 32768 through 65279 are for vendor use
// 65280 through 65534 are reserved
//
#define EFI_PXE_BASE_CODE_BOOT_TYPE_PXETEST   65535

#define EFI_PXE_BASE_CODE_BOOT_LAYER_MASK     0x7FFF
#define EFI_PXE_BASE_CODE_BOOT_LAYER_INITIAL  0x0000

//
// PXE Tag definition that identifies the processor 
// and programming environment of the client system.
// These identifiers are defined by IETF:
// http://www.ietf.org/assignments/dhcpv6-parameters/dhcpv6-parameters.xml
//
#if defined (MDE_CPU_IA32)
#define EFI_PXE_CLIENT_SYSTEM_ARCHITECTURE    0x0006
#elif defined (MDE_CPU_IPF) 
#define EFI_PXE_CLIENT_SYSTEM_ARCHITECTURE    0x0002
#elif defined (MDE_CPU_X64)
#define EFI_PXE_CLIENT_SYSTEM_ARCHITECTURE    0x0007
#elif defined (MDE_CPU_ARM)
#define EFI_PXE_CLIENT_SYSTEM_ARCHITECTURE    0x000A
#elif defined (MDE_CPU_AARCH64)
#define EFI_PXE_CLIENT_SYSTEM_ARCHITECTURE    0x000B
#endif


///
/// Discover() server list structure.
///
typedef struct {
  UINT16          Type;
  BOOLEAN         AcceptAnyResponse;
  UINT8           Reserved;
  EFI_IP_ADDRESS  IpAddr;
} EFI_PXE_BASE_CODE_SRVLIST;

///
/// Discover() information override structure.
///
typedef struct {
  BOOLEAN                   UseMCast;
  BOOLEAN                   UseBCast;
  BOOLEAN                   UseUCast;
  BOOLEAN                   MustUseList;
  EFI_IP_ADDRESS            ServerMCastIp;
  UINT16                    IpCnt;
  EFI_PXE_BASE_CODE_SRVLIST SrvList[1];
} EFI_PXE_BASE_CODE_DISCOVER_INFO;

///
/// TFTP opcode definitions.
///
typedef enum {
  EFI_PXE_BASE_CODE_TFTP_FIRST,
  EFI_PXE_BASE_CODE_TFTP_GET_FILE_SIZE,
  EFI_PXE_BASE_CODE_TFTP_READ_FILE,
  EFI_PXE_BASE_CODE_TFTP_WRITE_FILE,
  EFI_PXE_BASE_CODE_TFTP_READ_DIRECTORY,
  EFI_PXE_BASE_CODE_MTFTP_GET_FILE_SIZE,
  EFI_PXE_BASE_CODE_MTFTP_READ_FILE,
  EFI_PXE_BASE_CODE_MTFTP_READ_DIRECTORY,
  EFI_PXE_BASE_CODE_MTFTP_LAST
} EFI_PXE_BASE_CODE_TFTP_OPCODE;

///
/// MTFTP information. This information is required
/// to start or join a multicast TFTP session. It is also required to
/// perform the "get file size" and "read directory" operations of MTFTP.
///
typedef struct {
  EFI_IP_ADDRESS              MCastIp;
  EFI_PXE_BASE_CODE_UDP_PORT  CPort;
  EFI_PXE_BASE_CODE_UDP_PORT  SPort;
  UINT16                      ListenTimeout;
  UINT16                      TransmitTimeout;
} EFI_PXE_BASE_CODE_MTFTP_INFO;

///
/// DHCPV4 Packet structure.
///
typedef struct {
  UINT8   BootpOpcode;
  UINT8   BootpHwType;
  UINT8   BootpHwAddrLen;
  UINT8   BootpGateHops;
  UINT32  BootpIdent;
  UINT16  BootpSeconds;
  UINT16  BootpFlags;
  UINT8   BootpCiAddr[4];
  UINT8   BootpYiAddr[4];
  UINT8   BootpSiAddr[4];
  UINT8   BootpGiAddr[4];
  UINT8   BootpHwAddr[16];
  UINT8   BootpSrvName[64];
  UINT8   BootpBootFile[128];
  UINT32  DhcpMagik;
  UINT8   DhcpOptions[56];
} EFI_PXE_BASE_CODE_DHCPV4_PACKET;

///
/// DHCPV6 Packet structure.
///
typedef struct {
  UINT32  MessageType:8;
  UINT32  TransactionId:24;
  UINT8   DhcpOptions[1024];
} EFI_PXE_BASE_CODE_DHCPV6_PACKET;

///
/// Packet structure.
///
typedef union {
  UINT8                           Raw[1472];
  EFI_PXE_BASE_CODE_DHCPV4_PACKET Dhcpv4;
  EFI_PXE_BASE_CODE_DHCPV6_PACKET Dhcpv6;
} EFI_PXE_BASE_CODE_PACKET;

//
// PXE Base Code Mode structure
//
#define EFI_PXE_BASE_CODE_MAX_ARP_ENTRIES   8
#define EFI_PXE_BASE_CODE_MAX_ROUTE_ENTRIES 8

///
/// EFI_PXE_BASE_CODE_MODE.
/// The data values in this structure are read-only and 
/// are updated by the code that produces the
/// EFI_PXE_BASE_CODE_PROTOCOL functions.
///
typedef struct {
  BOOLEAN                       Started;
  BOOLEAN                       Ipv6Available;
  BOOLEAN                       Ipv6Supported;
  BOOLEAN                       UsingIpv6;
  BOOLEAN                       BisSupported;
  BOOLEAN                       BisDetected;
  BOOLEAN                       AutoArp;
  BOOLEAN                       SendGUID;
  BOOLEAN                       DhcpDiscoverValid;
  BOOLEAN                       DhcpAckReceived;
  BOOLEAN                       ProxyOfferReceived;
  BOOLEAN                       PxeDiscoverValid;
  BOOLEAN                       PxeReplyReceived;
  BOOLEAN                       PxeBisReplyReceived;
  BOOLEAN                       IcmpErrorReceived;
  BOOLEAN                       TftpErrorReceived;
  BOOLEAN                       MakeCallbacks;
  UINT8                         TTL;
  UINT8                         ToS;
  EFI_IP_ADDRESS                StationIp;
  EFI_IP_ADDRESS                SubnetMask;
  EFI_PXE_BASE_CODE_PACKET      DhcpDiscover;
  EFI_PXE_BASE_CODE_PACKET      DhcpAck;
  EFI_PXE_BASE_CODE_PACKET      ProxyOffer;
  EFI_PXE_BASE_CODE_PACKET      PxeDiscover;
  EFI_PXE_BASE_CODE_PACKET      PxeReply;
  EFI_PXE_BASE_CODE_PACKET      PxeBisReply;
  EFI_PXE_BASE_CODE_IP_FILTER   IpFilter;
  UINT32                        ArpCacheEntries;
  EFI_PXE_BASE_CODE_ARP_ENTRY   ArpCache[EFI_PXE_BASE_CODE_MAX_ARP_ENTRIES];
  UINT32                        RouteTableEntries;
  EFI_PXE_BASE_CODE_ROUTE_ENTRY RouteTable[EFI_PXE_BASE_CODE_MAX_ROUTE_ENTRIES];
  EFI_PXE_BASE_CODE_ICMP_ERROR  IcmpError;
  EFI_PXE_BASE_CODE_TFTP_ERROR  TftpError;
} EFI_PXE_BASE_CODE_MODE;

//
// PXE Base Code Interface Function definitions
//

/**                                                                 
  Enables the use of the PXE Base Code Protocol functions.

  This function enables the use of the PXE Base Code Protocol functions. If the
  Started field of the EFI_PXE_BASE_CODE_MODE structure is already TRUE, then
  EFI_ALREADY_STARTED will be returned. If UseIpv6 is TRUE, then IPv6 formatted
  addresses will be used in this session. If UseIpv6 is FALSE, then IPv4 formatted
  addresses will be used in this session. If UseIpv6 is TRUE, and the Ipv6Supported
  field of the EFI_PXE_BASE_CODE_MODE structure is FALSE, then EFI_UNSUPPORTED will
  be returned. If there is not enough memory or other resources to start the PXE
  Base Code Protocol, then EFI_OUT_OF_RESOURCES will be returned. Otherwise, the
  PXE Base Code Protocol will be started, and all of the fields of the EFI_PXE_BASE_CODE_MODE
  structure will be initialized as follows:
    StartedSet to TRUE.
    Ipv6SupportedUnchanged.
    Ipv6AvailableUnchanged.
    UsingIpv6Set to UseIpv6.
    BisSupportedUnchanged.
    BisDetectedUnchanged.
    AutoArpSet to TRUE.
    SendGUIDSet to FALSE.
    TTLSet to DEFAULT_TTL.
    ToSSet to DEFAULT_ToS.
    DhcpCompletedSet to FALSE.
    ProxyOfferReceivedSet to FALSE.
    StationIpSet to an address of all zeros.
    SubnetMaskSet to a subnet mask of all zeros.
    DhcpDiscoverZero-filled.
    DhcpAckZero-filled.
    ProxyOfferZero-filled.
    PxeDiscoverValidSet to FALSE.
    PxeDiscoverZero-filled.
    PxeReplyValidSet to FALSE.
    PxeReplyZero-filled.
    PxeBisReplyValidSet to FALSE.
    PxeBisReplyZero-filled.
    IpFilterSet the Filters field to 0 and the IpCnt field to 0.
    ArpCacheEntriesSet to 0.
    ArpCacheZero-filled.
    RouteTableEntriesSet to 0.
    RouteTableZero-filled.
    IcmpErrorReceivedSet to FALSE.
    IcmpErrorZero-filled.
    TftpErroReceivedSet to FALSE.
    TftpErrorZero-filled.
    MakeCallbacksSet to TRUE if the PXE Base Code Callback Protocol is available.
    Set to FALSE if the PXE Base Code Callback Protocol is not available.
    
  @param  This                  The pointer to the EFI_PXE_BASE_CODE_PROTOCOL instance.
  @param  UseIpv6               Specifies the type of IP addresses that are to be used during the session
                                that is being started. Set to TRUE for IPv6 addresses, and FALSE for     
                                IPv4 addresses.                                                                                                   
                                
  @retval EFI_SUCCESS           The PXE Base Code Protocol was started.
  @retval EFI_DEVICE_ERROR      The network device encountered an error during this oper  
  @retval EFI_UNSUPPORTED       UseIpv6 is TRUE, but the Ipv6Supported field of the
                                EFI_PXE_BASE_CODE_MODE structure is FALSE.  
  @retval EFI_ALREADY_STARTED   The PXE Base Code Protocol is already in the started state.                                   
  @retval EFI_INVALID_PARAMETER The This parameter is NULL or does not point to a valid
                                EFI_PXE_BASE_CODE_PROTOCOL structure.      
  @retval EFI_OUT_OF_RESOURCES  Could not allocate enough memory or other resources to start the                                          
                                PXE Base Code Protocol.                                         
                                     
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PXE_BASE_CODE_START)(
  IN EFI_PXE_BASE_CODE_PROTOCOL            *This,
  IN BOOLEAN                               UseIpv6
  );

/**                                                                 
  Disables the use of the PXE Base Code Protocol functions.

  This function stops all activity on the network device. All the resources allocated
  in Start() are released, the Started field of the EFI_PXE_BASE_CODE_MODE structure is
  set to FALSE and EFI_SUCCESS is returned. If the Started field of the EFI_PXE_BASE_CODE_MODE
  structure is already FALSE, then EFI_NOT_STARTED will be returned.
  
  @param  This                  The pointer to the EFI_PXE_BASE_CODE_PROTOCOL instance.
 
  @retval EFI_SUCCESS           The PXE Base Code Protocol was stopped.
  @retval EFI_NOT_STARTED       The PXE Base Code Protocol is already in the stopped state.  
  @retval EFI_INVALID_PARAMETER The This parameter is NULL or does not point to a valid
                                EFI_PXE_BASE_CODE_PROTOCOL structure.                  
  @retval EFI_DEVICE_ERROR      The network device encountered an error during this operation.                                
                                     
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PXE_BASE_CODE_STOP)(
  IN EFI_PXE_BASE_CODE_PROTOCOL    *This
  );

/**                                                                 
  Attempts to complete a DHCPv4 D.O.R.A. (discover / offer / request / acknowledge) or DHCPv6
  S.A.R.R (solicit / advertise / request / reply) sequence.

  This function attempts to complete the DHCP sequence. If this sequence is completed,
  then EFI_SUCCESS is returned, and the DhcpCompleted, ProxyOfferReceived, StationIp,
  SubnetMask, DhcpDiscover, DhcpAck, and ProxyOffer fields of the EFI_PXE_BASE_CODE_MODE
  structure are filled in.
  If SortOffers is TRUE, then the cached DHCP offer packets will be sorted before
  they are tried. If SortOffers is FALSE, then the cached DHCP offer packets will
  be tried in the order in which they are received. Please see the Preboot Execution
  Environment (PXE) Specification for additional details on the implementation of DHCP.
  This function can take at least 31 seconds to timeout and return control to the
  caller. If the DHCP sequence does not complete, then EFI_TIMEOUT will be returned.
  If the Callback Protocol does not return EFI_PXE_BASE_CODE_CALLBACK_STATUS_CONTINUE,
  then the DHCP sequence will be stopped and EFI_ABORTED will be returned.
    
  @param  This                  The pointer to the EFI_PXE_BASE_CODE_PROTOCOL instance.
  @param  SortOffers            TRUE if the offers received should be sorted. Set to FALSE to try the
                                offers in the order that they are received.                          
 
  @retval EFI_SUCCESS           Valid DHCP has completed.
  @retval EFI_NOT_STARTED       The PXE Base Code Protocol is in the stopped state.
  @retval EFI_INVALID_PARAMETER The This parameter is NULL or does not point to a valid
                                EFI_PXE_BASE_CODE_PROTOCOL structure.                  
  @retval EFI_DEVICE_ERROR      The network device encountered an error during this operation.                                
  @retval EFI_OUT_OF_RESOURCES  Could not allocate enough memory to complete the DHCP Protocol.
  @retval EFI_ABORTED           The callback function aborted the DHCP Protocol.
  @retval EFI_TIMEOUT           The DHCP Protocol timed out.
  @retval EFI_ICMP_ERROR        An ICMP error packet was received during the DHCP session.
  @retval EFI_NO_RESPONSE       Valid PXE offer was not received.
                                     
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PXE_BASE_CODE_DHCP)(
  IN EFI_PXE_BASE_CODE_PROTOCOL            *This,
  IN BOOLEAN                               SortOffers
  );

/**                                                                 
  Attempts to complete the PXE Boot Server and/or boot image discovery sequence.

  This function attempts to complete the PXE Boot Server and/or boot image discovery
  sequence. If this sequence is completed, then EFI_SUCCESS is returned, and the
  PxeDiscoverValid, PxeDiscover, PxeReplyReceived, and PxeReply fields of the
  EFI_PXE_BASE_CODE_MODE structure are filled in. If UseBis is TRUE, then the
  PxeBisReplyReceived and PxeBisReply fields of the EFI_PXE_BASE_CODE_MODE structure
  will also be filled in. If UseBis is FALSE, then PxeBisReplyValid will be set to FALSE.
  In the structure referenced by parameter Info, the PXE Boot Server list, SrvList[],
  has two uses: It is the Boot Server IP address list used for unicast discovery
  (if the UseUCast field is TRUE), and it is the list used for Boot Server verification
  (if the MustUseList field is TRUE). Also, if the MustUseList field in that structure
  is TRUE and the AcceptAnyResponse field in the SrvList[] array is TRUE, any Boot
  Server reply of that type will be accepted. If the AcceptAnyResponse field is
  FALSE, only responses from Boot Servers with matching IP addresses will be accepted.
  This function can take at least 10 seconds to timeout and return control to the
  caller. If the Discovery sequence does not complete, then EFI_TIMEOUT will be
  returned. Please see the Preboot Execution Environment (PXE) Specification for
  additional details on the implementation of the Discovery sequence.
  If the Callback Protocol does not return EFI_PXE_BASE_CODE_CALLBACK_STATUS_CONTINUE,
  then the Discovery sequence is stopped and EFI_ABORTED will be returned.
    
  @param  This                  The pointer to the EFI_PXE_BASE_CODE_PROTOCOL instance.
  @param  Type                  The type of bootstrap to perform.
  @param  Layer                 The pointer to the boot server layer number to discover, which must be
                                PXE_BOOT_LAYER_INITIAL when a new server type is being            
                                discovered.                                                       
  @param  UseBis                TRUE if Boot Integrity Services are to be used. FALSE otherwise.                                
  @param  Info                  The pointer to a data structure that contains additional information on the
                                type of discovery operation that is to be performed.                   
                                  
  @retval EFI_SUCCESS           The Discovery sequence has been completed.
  @retval EFI_NOT_STARTED       The PXE Base Code Protocol is in the stopped state.
  @retval EFI_INVALID_PARAMETER One or more parameters are invalid.                                
  @retval EFI_DEVICE_ERROR      The network device encountered an error during this operation.                                
  @retval EFI_OUT_OF_RESOURCES  Could not allocate enough memory to complete Discovery.
  @retval EFI_ABORTED           The callback function aborted the Discovery sequence.
  @retval EFI_TIMEOUT           The Discovery sequence timed out.
  @retval EFI_ICMP_ERROR        An ICMP error packet was received during the PXE discovery
                                session.                                                  
                                       
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PXE_BASE_CODE_DISCOVER)(
  IN EFI_PXE_BASE_CODE_PROTOCOL           *This,
  IN UINT16                               Type,
  IN UINT16                               *Layer,
  IN BOOLEAN                              UseBis,
  IN EFI_PXE_BASE_CODE_DISCOVER_INFO      *Info   OPTIONAL
  );

/**                                                                 
  Used to perform TFTP and MTFTP services.

  This function is used to perform TFTP and MTFTP services. This includes the
  TFTP operations to get the size of a file, read a directory, read a file, and
  write a file. It also includes the MTFTP operations to get the size of a file,
  read a directory, and read a file. The type of operation is specified by Operation.
  If the callback function that is invoked during the TFTP/MTFTP operation does
  not return EFI_PXE_BASE_CODE_CALLBACK_STATUS_CONTINUE, then EFI_ABORTED will
  be returned.
  For read operations, the return data will be placed in the buffer specified by
  BufferPtr. If BufferSize is too small to contain the entire downloaded file,
  then EFI_BUFFER_TOO_SMALL will be returned and BufferSize will be set to zero
  or the size of the requested file (the size of the requested file is only returned
  if the TFTP server supports TFTP options). If BufferSize is large enough for the
  read operation, then BufferSize will be set to the size of the downloaded file,
  and EFI_SUCCESS will be returned. Applications using the PxeBc.Mtftp() services
  should use the get-file-size operations to determine the size of the downloaded
  file prior to using the read-file operations--especially when downloading large
  (greater than 64 MB) files--instead of making two calls to the read-file operation.
  Following this recommendation will save time if the file is larger than expected
  and the TFTP server does not support TFTP option extensions. Without TFTP option
  extension support, the client has to download the entire file, counting and discarding
  the received packets, to determine the file size.
  For write operations, the data to be sent is in the buffer specified by BufferPtr.
  BufferSize specifies the number of bytes to send. If the write operation completes
  successfully, then EFI_SUCCESS will be returned.
  For TFTP "get file size" operations, the size of the requested file or directory
  is returned in BufferSize, and EFI_SUCCESS will be returned. If the TFTP server
  does not support options, the file will be downloaded into a bit bucket and the
  length of the downloaded file will be returned. For MTFTP "get file size" operations,
  if the MTFTP server does not support the "get file size" option, EFI_UNSUPPORTED
  will be returned.
  This function can take up to 10 seconds to timeout and return control to the caller.
  If the TFTP sequence does not complete, EFI_TIMEOUT will be returned.
  If the Callback Protocol does not return EFI_PXE_BASE_CODE_CALLBACK_STATUS_CONTINUE,
  then the TFTP sequence is stopped and EFI_ABORTED will be returned.
  The format of the data returned from a TFTP read directory operation is a null-terminated
  filename followed by a null-terminated information string, of the form
  "size year-month-day hour:minute:second" (i.e. %d %d-%d-%d %d:%d:%f - note that
  the seconds field can be a decimal number), where the date and time are UTC. For
  an MTFTP read directory command, there is additionally a null-terminated multicast
  IP address preceding the filename of the form %d.%d.%d.%d for IP v4. The final
  entry is itself null-terminated, so that the final information string is terminated
  with two null octets.
    
  @param  This                  The pointer to the EFI_PXE_BASE_CODE_PROTOCOL instance.
  @param  Operation             The type of operation to perform.
  @param  BufferPtr             A pointer to the data buffer.                                                                     
  @param  Overwrite             Only used on write file operations. TRUE if a file on a remote server can
                                be overwritten.                                                          
  @param  BufferSize            For get-file-size operations, *BufferSize returns the size of the
                                requested file.                                                  
  @param  BlockSize             The requested block size to be used during a TFTP transfer.
  @param  ServerIp              The TFTP / MTFTP server IP address.
  @param  Filename              A Null-terminated ASCII string that specifies a directory name or a file
                                name.                                                                   
  @param  Info                  The pointer to the MTFTP information.
  @param  DontUseBuffer         Set to FALSE for normal TFTP and MTFTP read file operation.                       
                                  
  @retval EFI_SUCCESS           The TFTP/MTFTP operation was completed.
  @retval EFI_NOT_STARTED       The PXE Base Code Protocol is in the stopped state.
  @retval EFI_INVALID_PARAMETER One or more parameters are invalid.                                
  @retval EFI_DEVICE_ERROR      The network device encountered an error during this operation.                                
  @retval EFI_BUFFER_TOO_SMALL  The buffer is not large enough to complete the read operation.   
  @retval EFI_ABORTED           The callback function aborted the TFTP/MTFTP operation.
  @retval EFI_TIMEOUT           The TFTP/MTFTP operation timed out.
  @retval EFI_ICMP_ERROR        An ICMP error packet was received during the MTFTP session.
  @retval EFI_TFTP_ERROR        A TFTP error packet was received during the MTFTP session.
                                                                      
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PXE_BASE_CODE_MTFTP)(
  IN EFI_PXE_BASE_CODE_PROTOCOL                *This,
  IN EFI_PXE_BASE_CODE_TFTP_OPCODE             Operation,
  IN OUT VOID                                  *BufferPtr OPTIONAL,
  IN BOOLEAN                                   Overwrite,
  IN OUT UINT64                                *BufferSize,
  IN UINTN                                     *BlockSize OPTIONAL,
  IN EFI_IP_ADDRESS                            *ServerIp,
  IN UINT8                                     *Filename  OPTIONAL,
  IN EFI_PXE_BASE_CODE_MTFTP_INFO              *Info      OPTIONAL,
  IN BOOLEAN                                   DontUseBuffer
  );

/**                                                                 
  Writes a UDP packet to the network interface.

  This function writes a UDP packet specified by the (optional HeaderPtr and)
  BufferPtr parameters to the network interface. The UDP header is automatically
  built by this routine. It uses the parameters OpFlags, DestIp, DestPort, GatewayIp,
  SrcIp, and SrcPort to build this header. If the packet is successfully built and
  transmitted through the network interface, then EFI_SUCCESS will be returned.
  If a timeout occurs during the transmission of the packet, then EFI_TIMEOUT will
  be returned. If an ICMP error occurs during the transmission of the packet, then
  the IcmpErrorReceived field is set to TRUE, the IcmpError field is filled in and
  EFI_ICMP_ERROR will be returned. If the Callback Protocol does not return
  EFI_PXE_BASE_CODE_CALLBACK_STATUS_CONTINUE, then EFI_ABORTED will be returned.
    
  @param  This                  The pointer to the EFI_PXE_BASE_CODE_PROTOCOL instance.
  @param  OpFlags               The UDP operation flags. 
  @param  DestIp                The destination IP address.
  @param  DestPort              The destination UDP port number.                                                                         
  @param  GatewayIp             The gateway IP address.                                                 
  @param  SrcIp                 The source IP address.
  @param  SrcPort               The source UDP port number.
  @param  HeaderSize            An optional field which may be set to the length of a header at
                                HeaderPtr to be prefixed to the data at BufferPtr.             
  @param  HeaderPtr             If HeaderSize is not NULL, a pointer to a header to be prefixed to the
                                data at BufferPtr.                                                    
  @param  BufferSize            A pointer to the size of the data at BufferPtr.
  @param  BufferPtr             A pointer to the data to be written.
                                  
  @retval EFI_SUCCESS           The UDP Write operation was completed.
  @retval EFI_NOT_STARTED       The PXE Base Code Protocol is in the stopped state.
  @retval EFI_INVALID_PARAMETER One or more parameters are invalid.                                
  @retval EFI_BAD_BUFFER_SIZE   The buffer is too long to be transmitted.  
  @retval EFI_ABORTED           The callback function aborted the UDP Write operation.
  @retval EFI_TIMEOUT           The UDP Write operation timed out.
  @retval EFI_ICMP_ERROR        An ICMP error packet was received during the UDP write session.  
                                                                      
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PXE_BASE_CODE_UDP_WRITE)(
  IN EFI_PXE_BASE_CODE_PROTOCOL                *This,
  IN UINT16                                    OpFlags,
  IN EFI_IP_ADDRESS                            *DestIp,
  IN EFI_PXE_BASE_CODE_UDP_PORT                *DestPort,
  IN EFI_IP_ADDRESS                            *GatewayIp,  OPTIONAL
  IN EFI_IP_ADDRESS                            *SrcIp,      OPTIONAL
  IN OUT EFI_PXE_BASE_CODE_UDP_PORT            *SrcPort,    OPTIONAL
  IN UINTN                                     *HeaderSize, OPTIONAL
  IN VOID                                      *HeaderPtr,  OPTIONAL
  IN UINTN                                     *BufferSize,
  IN VOID                                      *BufferPtr
  );

/**                                                                 
  Reads a UDP packet from the network interface.

  This function reads a UDP packet from a network interface. The data contents
  are returned in (the optional HeaderPtr and) BufferPtr, and the size of the
  buffer received is returned in BufferSize. If the input BufferSize is smaller
  than the UDP packet received (less optional HeaderSize), it will be set to the
  required size, and EFI_BUFFER_TOO_SMALL will be returned. In this case, the
  contents of BufferPtr are undefined, and the packet is lost. If a UDP packet is
  successfully received, then EFI_SUCCESS will be returned, and the information
  from the UDP header will be returned in DestIp, DestPort, SrcIp, and SrcPort if
  they are not NULL.
  Depending on the values of OpFlags and the DestIp, DestPort, SrcIp, and SrcPort
  input values, different types of UDP packet receive filtering will be performed.
  The following tables summarize these receive filter operations.
    
  @param  This                  The pointer to the EFI_PXE_BASE_CODE_PROTOCOL instance.
  @param  OpFlags               The UDP operation flags. 
  @param  DestIp                The destination IP address.
  @param  DestPort              The destination UDP port number.
  @param  SrcIp                 The source IP address.
  @param  SrcPort               The source UDP port number.
  @param  HeaderSize            An optional field which may be set to the length of a header at
                                HeaderPtr to be prefixed to the data at BufferPtr.             
  @param  HeaderPtr             If HeaderSize is not NULL, a pointer to a header to be prefixed to the
                                data at BufferPtr.                                                    
  @param  BufferSize            A pointer to the size of the data at BufferPtr.
  @param  BufferPtr             A pointer to the data to be read.
                                  
  @retval EFI_SUCCESS           The UDP Read operation was completed.
  @retval EFI_NOT_STARTED       The PXE Base Code Protocol is in the stopped state.
  @retval EFI_INVALID_PARAMETER One or more parameters are invalid.                                
  @retval EFI_DEVICE_ERROR      The network device encountered an error during this operation.
  @retval EFI_BUFFER_TOO_SMALL  The packet is larger than Buffer can hold.
  @retval EFI_ABORTED           The callback function aborted the UDP Read operation.
  @retval EFI_TIMEOUT           The UDP Read operation timed out.  
                                                                      
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PXE_BASE_CODE_UDP_READ)(
  IN EFI_PXE_BASE_CODE_PROTOCOL                *This,
  IN UINT16                                    OpFlags,
  IN OUT EFI_IP_ADDRESS                        *DestIp,     OPTIONAL
  IN OUT EFI_PXE_BASE_CODE_UDP_PORT            *DestPort,   OPTIONAL
  IN OUT EFI_IP_ADDRESS                        *SrcIp,      OPTIONAL
  IN OUT EFI_PXE_BASE_CODE_UDP_PORT            *SrcPort,    OPTIONAL
  IN UINTN                                     *HeaderSize, OPTIONAL
  IN VOID                                      *HeaderPtr,  OPTIONAL
  IN OUT UINTN                                 *BufferSize,
  IN VOID                                      *BufferPtr
  );

/**                                                                 
  Updates the IP receive filters of a network device and enables software filtering.
  
  The NewFilter field is used to modify the network device's current IP receive
  filter settings and to enable a software filter. This function updates the IpFilter
  field of the EFI_PXE_BASE_CODE_MODE structure with the contents of NewIpFilter.
  The software filter is used when the USE_FILTER in OpFlags is set to UdpRead().
  The current hardware filter remains in effect no matter what the settings of OpFlags
  are, so that the meaning of ANY_DEST_IP set in OpFlags to UdpRead() is from those
  packets whose reception is enabled in hardware - physical NIC address (unicast),
  broadcast address, logical address or addresses (multicast), or all (promiscuous).
  UdpRead() does not modify the IP filter settings.
  Dhcp(), Discover(), and Mtftp() set the IP filter, and return with the IP receive
  filter list emptied and the filter set to EFI_PXE_BASE_CODE_IP_FILTER_STATION_IP.
  If an application or driver wishes to preserve the IP receive filter settings,
  it will have to preserve the IP receive filter settings before these calls, and
  use SetIpFilter() to restore them after the calls. If incompatible filtering is
  requested (for example, PROMISCUOUS with anything else), or if the device does not
  support a requested filter setting and it cannot be accommodated in software
  (for example, PROMISCUOUS not supported), EFI_INVALID_PARAMETER will be returned.
  The IPlist field is used to enable IPs other than the StationIP. They may be
  multicast or unicast. If IPcnt is set as well as EFI_PXE_BASE_CODE_IP_FILTER_STATION_IP,
  then both the StationIP and the IPs from the IPlist will be used.
    
  @param  This                  The pointer to the EFI_PXE_BASE_CODE_PROTOCOL instance.
  @param  NewFilter             The pointer to the new set of IP receive filters.
  
  @retval EFI_SUCCESS           The IP receive filter settings were updated.
  @retval EFI_NOT_STARTED       The PXE Base Code Protocol is in the stopped state.
  @retval EFI_INVALID_PARAMETER One or more parameters are invalid.                                  
                                                                      
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PXE_BASE_CODE_SET_IP_FILTER)(
  IN EFI_PXE_BASE_CODE_PROTOCOL            *This,
  IN EFI_PXE_BASE_CODE_IP_FILTER           *NewFilter
  );

/**                                                                 
  Uses the ARP protocol to resolve a MAC address.
  
  This function uses the ARP protocol to resolve a MAC address. The UsingIpv6 field
  of the EFI_PXE_BASE_CODE_MODE structure is used to determine if IPv4 or IPv6
  addresses are being used. The IP address specified by IpAddr is used to resolve
  a MAC address. If the ARP protocol succeeds in resolving the specified address,
  then the ArpCacheEntries and ArpCache fields of the EFI_PXE_BASE_CODE_MODE structure
  are updated, and EFI_SUCCESS is returned. If MacAddr is not NULL, the resolved
  MAC address is placed there as well.
  If the PXE Base Code protocol is in the stopped state, then EFI_NOT_STARTED is
  returned. If the ARP protocol encounters a timeout condition while attempting
  to resolve an address, then EFI_TIMEOUT is returned. If the Callback Protocol
  does not return EFI_PXE_BASE_CODE_CALLBACK_STATUS_CONTINUE, then EFI_ABORTED is
  returned.
    
  @param  This                  The pointer to the EFI_PXE_BASE_CODE_PROTOCOL instance.
  @param  IpAddr                The pointer to the IP address that is used to resolve a MAC address.
  @param  MacAddr               If not NULL, a pointer to the MAC address that was resolved with the
                                ARP protocol.                                                       
                                  
  @retval EFI_SUCCESS           The IP or MAC address was resolved.
  @retval EFI_NOT_STARTED       The PXE Base Code Protocol is in the stopped state.
  @retval EFI_INVALID_PARAMETER One or more parameters are invalid.                                
  @retval EFI_DEVICE_ERROR      The network device encountered an error during this operation.  
  @retval EFI_ABORTED           The callback function aborted the ARP Protocol.
  @retval EFI_TIMEOUT           The ARP Protocol encountered a timeout condition.
                                                                      
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PXE_BASE_CODE_ARP)(
  IN EFI_PXE_BASE_CODE_PROTOCOL            *This,
  IN EFI_IP_ADDRESS                        *IpAddr,
  IN EFI_MAC_ADDRESS                       *MacAddr OPTIONAL
  );

/**                                                                 
  Updates the parameters that affect the operation of the PXE Base Code Protocol.
  
  This function sets parameters that affect the operation of the PXE Base Code Protocol.
  The parameter specified by NewAutoArp is used to control the generation of ARP
  protocol packets. If NewAutoArp is TRUE, then ARP Protocol packets will be generated
  as required by the PXE Base Code Protocol. If NewAutoArp is FALSE, then no ARP
  Protocol packets will be generated. In this case, the only mappings that are
  available are those stored in the ArpCache of the EFI_PXE_BASE_CODE_MODE structure.
  If there are not enough mappings in the ArpCache to perform a PXE Base Code Protocol
  service, then the service will fail. This function updates the AutoArp field of
  the EFI_PXE_BASE_CODE_MODE structure to NewAutoArp.
  The SetParameters() call must be invoked after a Callback Protocol is installed
  to enable the use of callbacks.
    
  @param  This                  The pointer to the EFI_PXE_BASE_CODE_PROTOCOL instance.
  @param  NewAutoArp            If not NULL, a pointer to a value that specifies whether to replace the
                                current value of AutoARP.                                              
  @param  NewSendGUID           If not NULL, a pointer to a value that specifies whether to replace the
                                current value of SendGUID.                                             
  @param  NewTTL                If not NULL, a pointer to be used in place of the current value of TTL,
                                the "time to live" field of the IP header.                           
  @param  NewToS                If not NULL, a pointer to be used in place of the current value of ToS,
                                the "type of service" field of the IP header.                        
  @param  NewMakeCallback       If not NULL, a pointer to a value that specifies whether to replace the
                                current value of the MakeCallback field of the Mode structure.                                                                
                                  
  @retval EFI_SUCCESS           The new parameters values were updated.
  @retval EFI_NOT_STARTED       The PXE Base Code Protocol is in the stopped state.
  @retval EFI_INVALID_PARAMETER One or more parameters are invalid.                                  
                                                                      
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PXE_BASE_CODE_SET_PARAMETERS)(
  IN EFI_PXE_BASE_CODE_PROTOCOL            *This,
  IN BOOLEAN                               *NewAutoArp,     OPTIONAL
  IN BOOLEAN                               *NewSendGUID,    OPTIONAL
  IN UINT8                                 *NewTTL,         OPTIONAL
  IN UINT8                                 *NewToS,         OPTIONAL
  IN BOOLEAN                               *NewMakeCallback OPTIONAL
  );

/**                                                                 
  Updates the station IP address and/or subnet mask values of a network device.
  
  This function updates the station IP address and/or subnet mask values of a network
  device.
  The NewStationIp field is used to modify the network device's current IP address.
  If NewStationIP is NULL, then the current IP address will not be modified. Otherwise,
  this function updates the StationIp field of the EFI_PXE_BASE_CODE_MODE structure
  with NewStationIp.
  The NewSubnetMask field is used to modify the network device's current subnet
  mask. If NewSubnetMask is NULL, then the current subnet mask will not be modified.
  Otherwise, this function updates the SubnetMask field of the EFI_PXE_BASE_CODE_MODE
  structure with NewSubnetMask.
    
  @param  This                  The pointer to the EFI_PXE_BASE_CODE_PROTOCOL instance.
  @param  NewStationIp          The pointer to the new IP address to be used by the network device.  
  @param  NewSubnetMask         The pointer to the new subnet mask to be used by the network device.                                 
                                  
  @retval EFI_SUCCESS           The new station IP address and/or subnet mask were updated.
  @retval EFI_NOT_STARTED       The PXE Base Code Protocol is in the stopped state.
  @retval EFI_INVALID_PARAMETER One or more parameters are invalid.                                  
                                                                      
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PXE_BASE_CODE_SET_STATION_IP)(
  IN EFI_PXE_BASE_CODE_PROTOCOL            *This,
  IN EFI_IP_ADDRESS                        *NewStationIp,   OPTIONAL
  IN EFI_IP_ADDRESS                        *NewSubnetMask   OPTIONAL
  );

/**                                                                 
  Updates the contents of the cached DHCP and Discover packets.
  
  The pointers to the new packets are used to update the contents of the cached
  packets in the EFI_PXE_BASE_CODE_MODE structure.
    
  @param  This                   The pointer to the EFI_PXE_BASE_CODE_PROTOCOL instance.
  @param  NewDhcpDiscoverValid   The pointer to a value that will replace the current
                                 DhcpDiscoverValid field.                        
  @param  NewDhcpAckReceived     The pointer to a value that will replace the current
                                 DhcpAckReceived field.                          
  @param  NewProxyOfferReceived  The pointer to a value that will replace the current
                                 ProxyOfferReceived field.                       
  @param  NewPxeDiscoverValid    The pointer to a value that will replace the current     
                                 ProxyOfferReceived field.                       
  @param  NewPxeReplyReceived    The pointer to a value that will replace the current
                                 PxeReplyReceived field.                         
  @param  NewPxeBisReplyReceived The pointer to a value that will replace the current
                                 PxeBisReplyReceived field.                      
  @param  NewDhcpDiscover        The pointer to the new cached DHCP Discover packet contents.   
  @param  NewDhcpAck             The pointer to the new cached DHCP Ack packet contents.
  @param  NewProxyOffer          The pointer to the new cached Proxy Offer packet contents.
  @param  NewPxeDiscover         The pointer to the new cached PXE Discover packet contents.
  @param  NewPxeReply            The pointer to the new cached PXE Reply packet contents.
  @param  NewPxeBisReply         The pointer to the new cached PXE BIS Reply packet contents.
                                   
  @retval EFI_SUCCESS            The cached packet contents were updated.
  @retval EFI_NOT_STARTED        The PXE Base Code Protocol is in the stopped state.
  @retval EFI_INVALID_PARAMETER  This is NULL or not point to a valid EFI_PXE_BASE_CODE_PROTOCOL structure.
                                                                      
**/
typedef
EFI_STATUS
(EFIAPI *EFI_PXE_BASE_CODE_SET_PACKETS)(
  IN EFI_PXE_BASE_CODE_PROTOCOL            *This,
  BOOLEAN                                  *NewDhcpDiscoverValid,   OPTIONAL
  BOOLEAN                                  *NewDhcpAckReceived,     OPTIONAL
  BOOLEAN                                  *NewProxyOfferReceived,  OPTIONAL
  BOOLEAN                                  *NewPxeDiscoverValid,    OPTIONAL
  BOOLEAN                                  *NewPxeReplyReceived,    OPTIONAL
  BOOLEAN                                  *NewPxeBisReplyReceived, OPTIONAL
  IN EFI_PXE_BASE_CODE_PACKET              *NewDhcpDiscover,        OPTIONAL
  IN EFI_PXE_BASE_CODE_PACKET              *NewDhcpAck,             OPTIONAL
  IN EFI_PXE_BASE_CODE_PACKET              *NewProxyOffer,          OPTIONAL
  IN EFI_PXE_BASE_CODE_PACKET              *NewPxeDiscover,         OPTIONAL
  IN EFI_PXE_BASE_CODE_PACKET              *NewPxeReply,            OPTIONAL
  IN EFI_PXE_BASE_CODE_PACKET              *NewPxeBisReply          OPTIONAL
  );

//
// PXE Base Code Protocol structure
//
#define EFI_PXE_BASE_CODE_PROTOCOL_REVISION   0x00010000

//
// Revision defined in EFI1.1
// 
#define EFI_PXE_BASE_CODE_INTERFACE_REVISION  EFI_PXE_BASE_CODE_PROTOCOL_REVISION

///
/// The EFI_PXE_BASE_CODE_PROTOCOL is used to control PXE-compatible devices.
/// An EFI_PXE_BASE_CODE_PROTOCOL will be layered on top of an
/// EFI_MANAGED_NETWORK_PROTOCOL protocol in order to perform packet level transactions.
/// The EFI_PXE_BASE_CODE_PROTOCOL handle also supports the
/// EFI_LOAD_FILE_PROTOCOL protocol. This provides a clean way to obtain control from the
/// boot manager if the boot path is from the remote device.
///
struct _EFI_PXE_BASE_CODE_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_BASE_CODE_START           Start;
  EFI_PXE_BASE_CODE_STOP            Stop;
  EFI_PXE_BASE_CODE_DHCP            Dhcp;
  EFI_PXE_BASE_CODE_DISCOVER        Discover;
  EFI_PXE_BASE_CODE_MTFTP           Mtftp;
  EFI_PXE_BASE_CODE_UDP_WRITE       UdpWrite;
  EFI_PXE_BASE_CODE_UDP_READ        UdpRead;
  EFI_PXE_BASE_CODE_SET_IP_FILTER   SetIpFilter;
  EFI_PXE_BASE_CODE_ARP             Arp;
  EFI_PXE_BASE_CODE_SET_PARAMETERS  SetParameters;
  EFI_PXE_BASE_CODE_SET_STATION_IP  SetStationIp;
  EFI_PXE_BASE_CODE_SET_PACKETS     SetPackets;
  ///
  /// The pointer to the EFI_PXE_BASE_CODE_MODE data for this device.
  ///
  EFI_PXE_BASE_CODE_MODE            *Mode;
};

extern EFI_GUID gEfiPxeBaseCodeProtocolGuid;

#endif 
