[mirror_edk2.git] / IntelFrameworkModulePkg / Csm / BiosThunk / Snp16Dxe / PxeUndi.c

/** @file\r
  Wrapper routines that use a PXE-enabled NIC option ROM to\r
  supply internal routines for an EFI SNI (Simple Network\r
  Interface) Protocol.\r
\r
  This file relies upon the existence of a PXE-compliant ROM\r
  in memory, as defined by the Preboot Execution Environment\r
  Specification (PXE), Version 2.1, located at\r
\r
  http://developer.intel.com/ial/wfm/wfmspecs.htm\r
\r
Copyright (c) 1999 - 2018, Intel Corporation. All rights reserved.<BR>\r
\r
This program and the accompanying materials\r
are licensed and made available under the terms and conditions\r
of the BSD License which accompanies this distribution.  The\r
full text of the license may be found at\r
http://opensource.org/licenses/bsd-license.php\r
\r
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include "BiosSnp16.h"\r
\r
/**\r
  PXE\r
  START UNDI\r
  Op-Code: PXENV_START_UNDI (0000h)\r
  Input: Far pointer to a PXENV_START_UNDI_T parameter structure that has been initialized by the caller.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field in\r
  the parameter structure must be set to one of the values represented by the PXENV_STATUS_xxx\r
  constants.\r
  Description: This service is used to pass the BIOS parameter registers to the UNDI driver. The UNDI driver is\r
  responsible for saving the information it needs to communicate with the hardware.\r
  This service is also responsible for hooking the Int 1Ah service routine\r
  Note: This API service must be called only once during UNDI Option ROM boot.\r
  The UNDI driver is responsible for saving this information and using it every time\r
  PXENV_UNDI_STARTUP is called.\r
  Service cannot be used in protected mode.\r
  typedef struct  {\r
      PXENV_STATUS Status;\r
      UINT16 AX;\r
      UINT16 BX;\r
      UINT16 DX;\r
      UINT16 DI;\r
      UINT16 ES;\r
  } PXENV_START_UNDI_T;\r
  Set before calling API service\r
  AX, BX, DX, DI, ES: BIOS initialization parameter registers. These\r
  fields should contain the same information passed to the option ROM\r
  initialization routine by the Host System BIOS. Information about the\r
  contents of these registers can be found in the [PnP], [PCI] and\r
  [BBS] specifications.\r
  Returned from API service\r
  Status: See the PXENV_STATUS_xxx constants.\r
\r
  @param  SimpleNetworkDevice   Device instance\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r
EFI_STATUS\r
PxeStartUndi (\r
  IN     EFI_SIMPLE_NETWORK_DEV  *SimpleNetworkDevice,\r
  IN OUT PXENV_START_UNDI_T      *PxeUndiTable\r
  )\r
{\r
  return MakePxeCall (\r
          SimpleNetworkDevice,\r
          PxeUndiTable,\r
          sizeof (PXENV_START_UNDI_T),\r
          PXENV_START_UNDI\r
          );\r
}\r
\r
/**\r
  PXE\r
  UNDI STARTUP\r
  Op-Code: PXENV_UNDI_STARTUP (0001h)\r
  Input: Far pointer to a PXENV_UNDI_STARTUP_T parameter structure that has been initialized by the\r
  caller.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field in\r
  the parameter structure must be set to one of the values represented by the\r
  PXENV_STATUS_xxx constants.\r
  Description: This API is responsible for initializing the contents of the UNDI code & data segment for proper\r
  operation. Information from the !PXE structure and the first PXENV_START_UNDI API call is used\r
  to complete this initialization. The rest of the UNDI APIs will not be available until this call has\r
  been completed.\r
  Note: PXENV_UNDI_STARTUP must not be called again without first calling\r
  PXENV_UNDI_SHUTDOWN.\r
  PXENV_UNDI_STARTUP and PXENV_UNDI_SHUTDOWN are no longer responsible for\r
  chaining interrupt 1Ah. This must be done by the PXENV_START_UNDI and\r
  PXENV_STOP_UNDI API calls.\r
  This service cannot be used in protected mode.\r
  typedef struct\r
  {\r
      PXENV_STATUS Status;\r
  } PXENV_UNDI_STARTUP_T;\r
  Set before calling API service\r
  N/A\r
  Returned from API service\r
  Status: See the PXENV_STATUS_xxx constants.\r
\r
  @param  SimpleNetworkDevice   Device instance\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r
EFI_STATUS\r
PxeUndiStartup (\r
  IN     EFI_SIMPLE_NETWORK_DEV  *SimpleNetworkDevice,\r
  IN OUT PXENV_UNDI_STARTUP_T    *PxeUndiTable\r
  )\r
{\r
  return MakePxeCall (\r
          SimpleNetworkDevice,\r
          PxeUndiTable,\r
          sizeof (PXENV_UNDI_STARTUP_T),\r
          PXENV_UNDI_STARTUP\r
          );\r
}\r
\r
/**\r
  PXE\r
  UNDI CLEANUP\r
  Op-Code: PXENV_UNDI_CLEANUP (0002h)\r
  Input: Far pointer to a PXENV_UNDI_CLEANUP_T parameter structure.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field\r
  in the parameter structure must be set to one of the values represented by the\r
  PXENV_STATUS_xxx constants.\r
  Description: This call will prepare the network adapter driver to be unloaded from memory. This call must be\r
  made just before unloading the Universal NIC Driver. The rest of the API will not be available\r
  after this call executes.\r
  This service cannot be used in protected mode.\r
  typedef struct {\r
      PXENX_STATUS Status;\r
  } PXENV_UNDI_CLEANUP_T;\r
  Set before calling API service\r
  N/A\r
  Returned from API service\r
  Status: See the PXENV_STATUS_xxx constants.\r
\r
  @param  SimpleNetworkDevice   Device instance\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r
EFI_STATUS\r
PxeUndiCleanup (\r
  IN     EFI_SIMPLE_NETWORK_DEV  *SimpleNetworkDevice,\r
  IN OUT PXENV_UNDI_CLEANUP_T    *PxeUndiTable\r
  )\r
{\r
  return MakePxeCall (\r
          SimpleNetworkDevice,\r
          PxeUndiTable,\r
          sizeof (PXENV_UNDI_CLEANUP_T),\r
          PXENV_UNDI_CLEANUP\r
          );\r
}\r
\r
/**\r
  PXE\r
  UNDI INITIALIZE\r
  Op-Code: PXENV_UNDI_INITIALIZE (0003h)\r
  Input: Far pointer to a PXENV_UNDI_INITIALIZE_T parameter structure that has been initialized by the\r
  caller.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field in\r
  the parameter structure must be set to one of the values represented by the PXENV_STATUS_xxx\r
  constants.\r
  Description: This call resets the adapter and programs it with default parameters. The default parameters used\r
  are those supplied to the most recent UNDI_STARTUP call. This routine does not enable the\r
  receive and transmit units of the network adapter to readily receive or transmit packets. The\r
  application must call PXENV_UNDI_OPEN to logically connect the network adapter to the network.\r
  This call must be made by an application to establish an interface to the network adapter driver.\r
  Note: When the PXE code makes this call to initialize the network adapter, it passes a NULL pointer for\r
  the Protocol field in the parameter structure.\r
  typedef struct {\r
    PXENV_STATUS Status;\r
    ADDR32 ProtocolIni;\r
    UINT8 reserved[8];\r
  } PXENV_UNDI_INITIALIZE_T;\r
  Set before calling API service\r
  ProtocolIni: Physical address of a memory copy of the driver\r
  module from the protocol.ini file obtained from the protocol manager\r
  driver (refer to the NDIS 2.0 specification). This parameter is\r
  supported for the universal NDIS driver to pass the information\r
  contained in the protocol.ini file to the NIC driver for any specific\r
  configuration of the NIC. (Note that the module identification in the\r
  protocol.ini file was done by NDIS.) This value can be NULL for any\r
  other application interfacing to the universal NIC driver\r
  Returned from API service\r
  Status: See the PXENV_STATUS_xxx constants.\r
\r
  @param  SimpleNetworkDevice   Device instance\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r
EFI_STATUS\r
PxeUndiInitialize (\r
  IN     EFI_SIMPLE_NETWORK_DEV   *SimpleNetworkDevice,\r
  IN OUT PXENV_UNDI_INITIALIZE_T  *PxeUndiTable\r
  )\r
{\r
  return MakePxeCall (\r
          SimpleNetworkDevice,\r
          PxeUndiTable,\r
          sizeof (PXENV_UNDI_INITIALIZE_T),\r
          PXENV_UNDI_INITIALIZE\r
          );\r
}\r
\r
/**\r
  Wrapper routine for reset adapter.\r
\r
  PXE\r
  UNDI RESET ADAPTER\r
  Op-Code: PXENV_UNDI_RESET_ADAPTER (0004h)\r
  Input: Far pointer to a PXENV_UNDI_RESET_ADAPTER_t parameter structure that has been initialized\r
  by the caller.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field in\r
  the parameter structure must be set to one of the values represented by the PXENV_STATUS_xxx\r
  constants.\r
  Description: This call resets and reinitializes the network adapter with the same set of parameters supplied to\r
  Initialize Routine. Unlike Initialize, this call opens the adapter that is, it connects logically to the\r
  network. This routine cannot be used to replace Initialize or Shutdown calls.\r
  typedef struct {\r
    PXENV_STATUS Status;\r
    PXENV_UNDI_MCAST_ADDRESS_t    R_Mcast_Buf;\r
  } PXENV_UNDI_RESET_T;\r
\r
  #define MAXNUM_MCADDR 8\r
\r
  typedef struct {\r
    UINT16 MCastAddrCount;\r
    MAC_ADDR McastAddr[MAXNUM_MCADDR];\r
  } PXENV_UNDI_MCAST_ADDRESS_t;\r
\r
  Set before calling API service\r
  R_Mcast_Buf: This is a structure of MCastAddrCount and\r
  McastAddr.\r
  MCastAddrCount: Number of multicast MAC addresses in the\r
  buffer.\r
  McastAddr: List of up to MAXNUM_MCADDR multicast MAC\r
  addresses.\r
  Returned from API service\r
  Status: See the PXENV_STATUS_xxx constants.\r
\r
  @param  SimpleNetworkDevice   Device instance.\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
  @param  RxFilter             Filter setting mask value for PXE recive .\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r
EFI_STATUS\r
PxeUndiResetNic (\r
  IN     EFI_SIMPLE_NETWORK_DEV  *SimpleNetworkDevice,\r
  IN OUT PXENV_UNDI_RESET_T      *PxeUndiTable,\r
  IN     UINT16                  RxFilter\r
  )\r
{\r
  PXENV_UNDI_OPEN_T   Open;\r
  PXENV_UNDI_CLOSE_T  Close;\r
  UINTN               Status;\r
\r
  Status = MakePxeCall (\r
            SimpleNetworkDevice,\r
            PxeUndiTable,\r
            sizeof (PXENV_UNDI_RESET_T),\r
            PXENV_UNDI_RESET_NIC\r
            );\r
  if (!EFI_ERROR(Status)) {\r
    return Status;\r
  }\r
\r
  Close.Status = PXENV_STATUS_SUCCESS;\r
\r
  Status = MakePxeCall (\r
            SimpleNetworkDevice,\r
            &Close,\r
            sizeof (Close),\r
            PXENV_UNDI_CLOSE\r
            );\r
  if (EFI_ERROR(Status)) {\r
    return EFI_DEVICE_ERROR;\r
  }\r
\r
  Status = MakePxeCall (\r
            SimpleNetworkDevice,\r
            PxeUndiTable,\r
            sizeof (PXENV_UNDI_RESET_T),\r
            PXENV_UNDI_RESET_NIC\r
            );\r
  if (EFI_ERROR(Status)) {\r
    return EFI_DEVICE_ERROR;\r
  }\r
\r
  Open.Status       = PXENV_STATUS_SUCCESS;\r
  Open.OpenFlag     = 0;\r
  Open.PktFilter    = RxFilter;\r
  CopyMem (\r
    &Open.McastBuffer,\r
    &PxeUndiTable->R_Mcast_Buf,\r
    sizeof (PXENV_UNDI_MCAST_ADDR_T)\r
    );\r
\r
\r
  Status = MakePxeCall (\r
            SimpleNetworkDevice,\r
            &Open,\r
            sizeof (Open),\r
            PXENV_UNDI_OPEN\r
            );\r
  if (EFI_ERROR(Status)) {\r
    return EFI_DEVICE_ERROR;\r
  }\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  PXE\r
  UNDI SHUTDOWN\r
  Op-Code: PXENV_UNDI_SHUTDOWN (0005h)\r
  Input: Far pointer to a PXENV_UNDI_SHUTDOWN_T parameter.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field in\r
  the parameter structure must be set to one of the values represented by the PXENV_STATUS_xxx\r
  constants.\r
  Description: This call resets the network adapter and leaves it in a safe state for another driver to program it.\r
  Note: The contents of the PXENV_UNDI_STARTUP parameter structure need to be saved by the\r
  Universal NIC Driver in case PXENV_UNDI_INITIALIZE is called again.\r
  typedef struct\r
  {\r
    PXENV_STATUS Status;\r
  } PXENV_UNDI_SHUTDOWN_T;\r
  Set before calling API service\r
  N/A\r
  Returned from API service\r
  Status: See the PXENV_STATUS_xxx constants.\r
\r
  @param  SimpleNetworkDevice   Device instance\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r
EFI_STATUS\r
PxeUndiShutdown (\r
  IN     EFI_SIMPLE_NETWORK_DEV  *SimpleNetworkDevice,\r
  IN OUT PXENV_UNDI_SHUTDOWN_T   *PxeUndiTable\r
  )\r
{\r
  return MakePxeCall (\r
          SimpleNetworkDevice,\r
          PxeUndiTable,\r
          sizeof (PXENV_UNDI_SHUTDOWN_T),\r
          PXENV_UNDI_SHUTDOWN\r
          );\r
}\r
\r
/**\r
  PXE\r
  UNDI OPEN\r
  Op-Code: PXENV_UNDI_OPEN (0006h)\r
  Input: Far pointer to a PXENV_UNDI_OPEN_T parameter structure that has been initialized by the caller.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field in\r
  the parameter structure must be set to one of the values represented by the PXENV_STATUS_xxx\r
  constants.\r
  Description: This call activates the adapter network connection and sets the adapter ready to accept packets\r
  for transmit and receive.\r
  typedef struct {\r
    PXENV_STATUS Status;\r
    UINT16 OpenFlag;\r
    UINT16 PktFilter;\r
      #define FLTR_DIRECTED 0x0001\r
      #define FLTR_BRDCST 0x0002\r
      #define FLTR_PRMSCS 0x0004\r
      #define FLTR_SRC_RTG 0x0008\r
    PXENV_UNDI_MCAST_ADDRESS_t R_Mcast_Buf;\r
  } PXENV_UNDI_OPEN_T;\r
  Set before calling API service\r
  OpenFlag: This is an adapter specific input parameter. This is\r
  supported for the universal NDIS 2.0 driver to pass in the open flags\r
  provided by the protocol driver. (See the NDIS 2.0 specification.)\r
  This can be zero.\r
  PktFilter: Filter for receiving packets. This can be one, or more, of\r
  the FLTR_xxx constants. Multiple values are arithmetically or-ed\r
  together.\r
  directed packets are packets that may come to your MAC address\r
  or the multicast MAC address.\r
  R_Mcast_Buf: See definition in UNDI RESET ADAPTER (0004h).\r
  Returned from API service\r
  Status: See the PXENV_STATUS_xxx constants.\r
\r
  @param  SimpleNetworkDevice   Device instance\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r
EFI_STATUS\r
PxeUndiOpen (\r
  IN     EFI_SIMPLE_NETWORK_DEV  *SimpleNetworkDevice,\r
  IN OUT PXENV_UNDI_OPEN_T       *PxeUndiTable\r
  )\r
{\r
  return MakePxeCall (\r
          SimpleNetworkDevice,\r
          PxeUndiTable,\r
          sizeof (PXENV_UNDI_OPEN_T),\r
          PXENV_UNDI_OPEN\r
          );\r
}\r
\r
/**\r
  PXE\r
  UNDI CLOSE\r
  Op-Code: PXENV_UNDI_CLOSE (0007h)\r
  Input: Far pointer to a PXENV_UNDI_CLOSE_T parameter.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field in\r
  the parameter structure must be set to one of the values represented by the PXENV_STATUS_xxx\r
  constants.\r
  Description: This call disconnects the network adapter from the network. Packets cannot be transmitted or\r
  received until the network adapter is open again.\r
  typedef struct {\r
    PXENV_STATUS Status;\r
  } PXENV_UNDI_CLOSE_T;\r
  Set before calling API service\r
  N/A\r
  Returned from API service\r
  Status: See the PXENV_STATUS_xxx constants.\r
\r
  @param  SimpleNetworkDevice   Device instance\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r
EFI_STATUS\r
PxeUndiClose (\r
  IN     EFI_SIMPLE_NETWORK_DEV  *SimpleNetworkDevice,\r
  IN OUT PXENV_UNDI_CLOSE_T      *PxeUndiTable\r
  )\r
{\r
  return MakePxeCall (\r
          SimpleNetworkDevice,\r
          PxeUndiTable,\r
          sizeof (PXENV_UNDI_CLOSE_T),\r
          PXENV_UNDI_CLOSE\r
          );\r
}\r
\r
/**\r
  PXE\r
  UNDI TRANSMIT PACKET\r
  Op-Code: PXENV_UNDI_TRANSMIT (0008h)\r
  Input: Far pointer to a PXENV_UNDI_TRANSMIT_T parameter structure that\r
  has been initialized by the caller.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX.\r
  The status code must be set to one of the values represented by the\r
  PXENV_STATUS_xxx constants.\r
  Description: This call transmits a buffer to the network. The media header\r
  for the packet can be filled by the calling protocol, but it might not be.\r
  The network adapter driver will fill it if required by the values in the\r
  parameter block. The packet is buffered for transmission provided there is\r
  an available buffer, and the function returns PXENV_EXIT_SUCCESS. If no\r
  buffer is available the function returns PXENV_EXIT_FAILURE with a status\r
  code of PXE_UNDI_STATUS__OUT OF_RESOURCE. The number of buffers is\r
  implementation-dependent. An interrupt is generated on completion of the\r
  transmission of one or more packets. A call to PXENV_UNDI_TRANSMIT is\r
  permitted in the context of a transmit complete interrupt.\r
\r
  typedef struct {\r
    PXENV_STATUS Status;\r
    UINT8 Protocol;\r
      #define P_UNKNOWN 0\r
      #define P_IP 1\r
      #define P_ARP 2\r
      #define P_RARP 3\r
    UINT8 XmitFlag;\r
      #define XMT_DESTADDR 0x0000\r
      #define XMT_BROADCAST 0x0001\r
    SEGOFF16 DestAddr;\r
    SEGOFF16 TBD;\r
    UINT32 Reserved[2];\r
  } t_PXENV_UNDI_TRANSMIT;\r
\r
  #define MAX_DATA_BLKS 8\r
\r
  typedef struct {\r
    UINT16 ImmedLength;\r
    SEGOFF16 Xmit;\r
    UINT16 DataBlkCount;\r
    struct DataBlk {\r
      UINT8 TDPtrType;\r
      UINT8 TDRsvdByte;\r
      UINT16 TDDataLen;\r
      SEGOFF16 TDDataPtr;\r
    } DataBlock[MAX_DATA_BLKS];\r
  } PXENV_UNDI_TBD_T\r
\r
  Set before calling API service\r
  Protocol: This is the protocol of the upper layer that is calling UNDI\r
  TRANSMIT call. If the upper layer has filled the media header, this\r
  field must be P_UNKNOWN.\r
  XmitFlag: If this flag is XMT_DESTADDR, the NIC driver expects a\r
  pointer to the destination media address in the field DestAddr. If\r
  XMT_BROADCAST, the NIC driver fills the broadcast address for the\r
  destination.\r
  TBD: Segment:Offset address of the transmit buffer descriptor.\r
  ImmedLength: Length of the immediate transmit buffer: Xmit.\r
  Xmit: Segment:Offset of the immediate transmit buffer.\r
  DataBlkCount: Number of blocks in this transmit buffer.\r
  TDPtrType:\r
  0 => 32-bit physical address in TDDataPtr (not supported in this\r
  version of PXE)\r
  1 => segment:offset in TDDataPtr which can be a real mode or 16-bit\r
  protected mode pointer\r
  TDRsvdByte: Reserved must be zero.\r
  TDDatalen: Data block length in bytes.\r
  TDDataPtr: Segment:Offset of the transmit block.\r
  DataBlock: Array of transmit data blocks.\r
  Returned from API service\r
  Status: See the PXENV_STATUS_xxx constants\r
\r
  @param  SimpleNetworkDevice   Device instance\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r
EFI_STATUS\r
PxeUndiTransmit (\r
  IN     EFI_SIMPLE_NETWORK_DEV  *SimpleNetworkDevice,\r
  IN OUT PXENV_UNDI_TRANSMIT_T   *PxeUndiTable\r
  )\r
{\r
  EFI_STATUS  Status;\r
\r
  Status = MakePxeCall (\r
            SimpleNetworkDevice,\r
            PxeUndiTable,\r
            sizeof (PXENV_UNDI_TRANSMIT_T),\r
            PXENV_UNDI_TRANSMIT\r
            );\r
  if (Status == EFI_SUCCESS) {\r
    return EFI_SUCCESS;\r
  }\r
\r
  switch (PxeUndiTable->Status) {\r
  case PXENV_STATUS_OUT_OF_RESOURCES:\r
    return EFI_NOT_READY;\r
\r
  default:\r
    return EFI_DEVICE_ERROR;\r
  }\r
}\r
\r
\r
\r
/**\r
  PXE\r
  UNDI SET STATION ADDRESS\r
  Op-Code: PXENV_UNDI_SET_STATION_ADDRESS (000Ah)\r
  Input: Far pointer to a PXENV_UNDI_SET_STATION_ADDRESS_t parameter structure that has been\r
  initialized by the caller.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field in\r
  the parameter structure must be set to one of the values represented by the PXENV_STATUS_xxx\r
  constants.\r
  Description: This call sets the MAC address to be the input value and is called before opening the network\r
  adapter. Later, the open call uses this variable as a temporary MAC address to program the\r
  adapter individual address registers.\r
  typedef struct {\r
    PXENV_STATUS Status;\r
    MAC_ADDR StationAddress;\r
  } PXENV_UNDI_SET_STATION_ADDR_T;\r
  Set before calling API service\r
  StationAddress: Temporary MAC address to be used for\r
  transmit and receive.\r
  Returned from API service\r
  Status: See the PXENV_STATUS_xxx constants.\r
\r
  @param  SimpleNetworkDevice   Device instance\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r
EFI_STATUS\r
PxeUndiSetStationAddr (\r
  IN     EFI_SIMPLE_NETWORK_DEV         *SimpleNetworkDevice,\r
  IN OUT PXENV_UNDI_SET_STATION_ADDR_T  *PxeUndiTable\r
  )\r
{\r
  return MakePxeCall (\r
          SimpleNetworkDevice,\r
          PxeUndiTable,\r
          sizeof (PXENV_UNDI_SET_STATION_ADDR_T),\r
          PXENV_UNDI_SET_STATION_ADDR\r
          );\r
}\r
\r
/**\r
  PXE\r
  UNDI SET PACKET FILTER\r
  Op-Code: PXENV_UNDI_SET_PACKET_FILTER (000Bh)\r
  Input: Far pointer to a PXENV_UNDI_SET_PACKET_FILTER_T parameter structure that has been\r
  initialized by the caller.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field in\r
  the parameter structure must be set to one of the values represented by the PXENV_STATUS_xxx\r
  constants.\r
  Description: This call resets the adapter's receive unit to accept a new filter, different from the one provided with\r
  the open call.\r
  typedef struct {\r
    PXENV_STATUS Status;\r
    UINT8 filter;\r
  } PXENV_UNDI_SET_PACKET_FILTER_T;\r
  Set before calling API service\r
  Filter: See the receive filter values in the UNDI OPEN\r
  (0006h) API description.\r
  Returned from API service\r
  Status: See the PXENV_STATUS_xxx constants.\r
\r
  @param  SimpleNetworkDevice   Device instance\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r
\r
/**\r
  PXE\r
  UNDI GET INFORMATION\r
  Op-Code: PXENV_UNDI_GET_INFORMATION (000Ch)\r
  Input: Far pointer to a PXENV_UNDI_GET_INFORMATION_T parameter structure that has been\r
  initialized by the caller.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field in\r
  the parameter structure must be set to one of the values represented by the\r
  PXENV_STATUS_xxx constants.\r
  Description: This call copies the network adapter variables, including the MAC address, into the input buffer.\r
  Note: The PermNodeAddress field must be valid after PXENV_START_UNDI and\r
  PXENV_UNDI_STARTUP have been issued. All other fields must be valid after\r
  PXENV_START_UNDI, PXENV_UNDI_STARTUP and PXENV_UNDI_INITIALIZE have been\r
  called.\r
  typedef struct {\r
    PXENV_STATUS Status;\r
    UINT16 BaseIo;\r
    UINT16 IntNumber;\r
    UINT16 MaxTranUnit;\r
    UINT16 HwType;\r
      #define ETHER_TYPE 1\r
      #define EXP_ETHER_TYPE 2\r
      #define IEEE_TYPE 6\r
      #define ARCNET_TYPE 7\r
    UINT16 HwAddrLen;\r
    MAC_ADDR CurrentNodeAddress;\r
    MAC_ADDR PermNodeAddress;\r
    SEGSEL ROMAddress;\r
    UINT16 RxBufCt;\r
    UINT16 TxBufCt;\r
  } PXENV_UNDI_GET_INFORMATION_T;\r
  Set before calling API service\r
  N/A\r
  Returned from API service\r
  Status: See the PXENV_STATUS_xxx constants.\r
  BaseIO: Adapter base I/O address.\r
  IntNumber: Adapter IRQ number.\r
  MaxTranUnit: Adapter maximum transmit unit.\r
  HWType: Type of protocol at the hardware level.\r
  HWAddrLen: Length of the hardware address.\r
  CurrentNodeAddress: Current hardware address.\r
  PermNodeAddress: Permanent hardware address.\r
  ROMAddress: Real mode ROM segment address.\r
  RxBufCnt: Receive queue length.\r
  TxBufCnt: Transmit queue length.\r
\r
  @param  SimpleNetworkDevice   Device instance\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r
EFI_STATUS\r
PxeUndiGetInformation (\r
  IN     EFI_SIMPLE_NETWORK_DEV        *SimpleNetworkDevice,\r
  IN OUT PXENV_UNDI_GET_INFORMATION_T  *PxeUndiTable\r
  )\r
{\r
  return MakePxeCall (\r
          SimpleNetworkDevice,\r
          PxeUndiTable,\r
          sizeof (PXENV_UNDI_GET_INFORMATION_T),\r
          PXENV_UNDI_GET_INFORMATION\r
          );\r
}\r
\r
/**\r
  PXE\r
  UNDI GET STATISTICS\r
  Op-Code: PXENV_UNDI_GET_STATISTICS (000Dh)\r
  Input: Far pointer to a PXENV_UNDI_GET_STATISTICS_T parameter structure that has been initialized\r
  by the caller.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field in\r
  the parameter structure must be set to one of the values represented by the PXENV_STATUS_xxx\r
  constants.\r
  Description: This call reads statistical information from the network adapter, and returns.\r
  typedef struct {\r
    PXENV_STATUS Status;\r
    UINT32 XmtGoodFrames;\r
    UINT32 RcvGoodFrames;\r
    UINT32 RcvCRCErrors;\r
    UINT32 RcvResourceErrors;\r
  } PXENV_UNDI_GET_STATISTICS_T;\r
  Set before calling API service\r
  N/A\r
  Returned from API service\r
  Status: See the PXENV_STATUS_xxx constants.\r
  XmtGoodFrames: Number of successful transmissions.\r
  RcvGoodFrames: Number of good frames received.\r
  RcvCRCErrors: Number of frames received with CRC\r
  error.\r
  RcvResourceErrors: Number of frames discarded\r
  because receive queue was full.\r
\r
  @param  SimpleNetworkDevice   Device instance\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r
EFI_STATUS\r
PxeUndiGetStatistics (\r
  IN     EFI_SIMPLE_NETWORK_DEV       *SimpleNetworkDevice,\r
  IN OUT PXENV_UNDI_GET_STATISTICS_T  *PxeUndiTable\r
  )\r
{\r
  return MakePxeCall (\r
          SimpleNetworkDevice,\r
          PxeUndiTable,\r
          sizeof (PXENV_UNDI_GET_STATISTICS_T),\r
          PXENV_UNDI_GET_STATISTICS\r
          );\r
}\r
\r
/**\r
  PXE\r
  UNDI CLEAR STATISTICS\r
  Op-Code: PXENV_UNDI_CLEAR_STATISTICS (000Eh)\r
  Input: Far pointer to a PXENV_UNDI_CLEAR_STATISTICS_T parameter.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field in\r
  the parameter structure must be set to one of the values represented by the\r
  PXENV_STATUS_xxx constants.\r
  Description: This call clears the statistical information from the network adapter.\r
  typedef struct {\r
    PXENV_STATUS Status;\r
  } PXENV_UNDI_CLEAR_STATISTICS_T;\r
  Set before calling API service\r
  N/A\r
  Returned from API service\r
  Status: See the PXENV_STATUS_xxx constants.\r
\r
  @param  SimpleNetworkDevice   Device instance\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r
EFI_STATUS\r
PxeUndiClearStatistics (\r
  IN     EFI_SIMPLE_NETWORK_DEV         *SimpleNetworkDevice,\r
  IN OUT PXENV_UNDI_CLEAR_STATISTICS_T  *PxeUndiTable\r
  )\r
{\r
  return MakePxeCall (\r
          SimpleNetworkDevice,\r
          PxeUndiTable,\r
          sizeof (PXENV_UNDI_CLEAR_STATISTICS_T),\r
          PXENV_UNDI_CLEAR_STATISTICS\r
          );\r
}\r
\r
/**\r
  PXE\r
  UNDI INITIATE DIAGS\r
  Op-Code: PXENV_UNDI_INITIATE_DIAGS (000Fh)\r
  Input: Far pointer to a PXENV_UNDI_INITIATE_DIAGS_T parameter.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field in\r
  the parameter structure must be set to one of the values represented by the\r
  PXENV_STATUS_xxx constants.\r
  Description: This call can be used to initiate the run-time diagnostics. It causes the network adapter to run\r
  hardware diagnostics and to update its status information.\r
  typedef struct {\r
    PXENV_STATUS Status;\r
  } PXENV_UNDI_INITIATE_DIAGS_T;\r
  Set before calling API service\r
  N/A\r
  Returned from API service\r
  Status: See the PXENV_STATUS_xxx constants.\r
\r
  @param  SimpleNetworkDevice   Device instance\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r
\r
/**\r
  PXE\r
  UNDI FORCE INTERRUPT\r
  Op-Code: PXENV_UNDI_FORCE_INTERRUPT (0010h)\r
  Input: Far pointer to a PXENV_UNDI_FORCE_INTERRUPT_T parameter structure that has been\r
  initialized by the caller.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field in\r
  the parameter structure must be set to one of the values represented by the PXENV_STATUS_xxx\r
  constants.\r
  Description: This call forces the network adapter to generate an interrupt. When a receive interrupt occurs, the\r
  network adapter driver usually queues the packet and calls the application's callback receive\r
  routine with a pointer to the packet received. Then, the callback routine either can copy the packet\r
  to its buffer or can decide to delay the copy to a later time. If the packet is not immediately copied,\r
  the network adapter driver does not remove it from the input queue. When the application wants to\r
  copy the packet, it can call the PXENV_UNDI_FORCE_INTERRUPT routine to simulate the receive\r
  interrupt.\r
  typedef struct {\r
    PXENV_STATUS Status;\r
  } PXENV_UNDI_FORCE_INTERRUPT_T;\r
  Set before calling API service\r
  N/A\r
  Returned from API service\r
  Status: See the PXENV_STATUS_xxx constants.\r
\r
  @param  SimpleNetworkDevice   Device instance\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r
\r
/**\r
  PXE\r
  UNDI GET MULTICAST ADDRESS\r
  Op-Code: PXENV_UNDI_GET_MCAST_ADDRESS (0011h)\r
  Input: Far pointer to a PXENV_GET_MCAST_ADDRESS_t parameter structure that has been initialized\r
  by the caller.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field in\r
  the parameter structure must be set to one of the values represented by the PXENV_STATUS_xxx\r
  constants.\r
  Description: This call converts the given IP multicast address to a hardware multicast address.\r
  typedef struct  {\r
    PXENV_STATUS Status;\r
    IP4 InetAddr;\r
    MAC_ADDR MediaAddr;\r
  } PXENV_UNDI_GET_MCAST_ADDR_T;\r
  Set before calling API service\r
  InetAddr: IP multicast address.\r
  Returned from API service\r
  Status: See the PXENV_STATUS_xxx constants.\r
  MediaAddr: MAC multicast address.\r
\r
  @param  SimpleNetworkDevice   Device instance\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r
EFI_STATUS\r
PxeUndiGetMcastAddr (\r
  IN     EFI_SIMPLE_NETWORK_DEV       *SimpleNetworkDevice,\r
  IN OUT PXENV_UNDI_GET_MCAST_ADDR_T  *PxeUndiTable\r
  )\r
{\r
  return MakePxeCall (\r
          SimpleNetworkDevice,\r
          PxeUndiTable,\r
          sizeof (PXENV_UNDI_GET_MCAST_ADDR_T),\r
          PXENV_UNDI_GET_MCAST_ADDR\r
          );\r
}\r
\r
/**\r
  PXE\r
  UNDI GET NIC TYPE\r
  Op-Code: PXENV_UNDI_GET_NIC_TYPE (0012h)\r
  Input: Far pointer to a PXENV_UNDI_GET_NIC_TYPE parameter structure that has been initialized by\r
  the caller.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field in\r
  the parameter structure must be set to one of the values represented by the PXENV_STATUS_xxx\r
  constants. If the PXENV_EXIT_SUCCESS is returned the parameter structure must contain the\r
  NIC information.\r
  Description: This call, if successful, provides the NIC-specific information necessary to identify the network\r
  adapter that is used to boot the system.\r
  Note: The application first gets the DHCPDISCOVER packet using GET_CACHED_INFO and checks if\r
  the UNDI is supported before making this call. If the UNDI is not supported, the NIC-specific\r
  information can be obtained from the DHCPDISCOVER packet itself.\r
  PXENV_START_UNDI, PXENV_UNDI_STARTUP and PXENV_UNDI_INITIALIZE must be called\r
  before the information provided is valid.\r
  typedef {\r
    PXENV_STATUS Status;\r
    UINT8 NicType;\r
      #define PCI_NIC 2\r
      #define PnP_NIC 3\r
      #define CardBus_NIC 4\r
    Union {\r
      Struct {\r
        UINT16 Vendor_ID;\r
        UINT16 Dev_ID;\r
        UINT8 Base_Class;\r
        UINT8 Sub_Class;\r
        UINT8 Prog_Intf;\r
        UINT8 Rev;\r
        UINT16 BusDevFunc;\r
        UINT16 SubVendor_ID;\r
        UINT16 SubDevice_ID;\r
      } pci, cardbus;\r
      struct {\r
        UINT32 EISA_Dev_ID;\r
        UINT8 Base_Class;\r
        UINT8 Sub_Class;\r
        UINT8 Prog_Intf;\r
        UINT16 CardSelNum;\r
      } pnp;\r
    } info;\r
  } PXENV_UNDI_GET_NIC_TYPE_T;\r
  Set before calling API service\r
  N/A\r
  Returned from API service\r
  Status: See the PXENV_STATUS_xxx constants.\r
  NICType: Type of NIC information stored in the parameter\r
  structure.\r
  Info: Information about the fields in this union can be found\r
  in the [PnP] and [PCI] specifications\r
\r
  @param  SimpleNetworkDevice   Device instance\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r
EFI_STATUS\r
PxeUndiGetNicType (\r
  IN     EFI_SIMPLE_NETWORK_DEV     *SimpleNetworkDevice,\r
  IN OUT PXENV_UNDI_GET_NIC_TYPE_T  *PxeUndiTable\r
  )\r
{\r
  return MakePxeCall (\r
          SimpleNetworkDevice,\r
          PxeUndiTable,\r
          sizeof (PXENV_UNDI_GET_NIC_TYPE_T),\r
          PXENV_UNDI_GET_NIC_TYPE\r
          );\r
}\r
\r
/**\r
  PXE\r
  UNDI GET IFACE INFO\r
  Op-Code: PXENV_UNDI_GET_IFACE_INFO (0013h)\r
  Input: Far pointer to a PXENV_UNDI_GET_IFACE_INFO_t parameter structure that has been initialized\r
  by the caller.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field in\r
  the parameter structure must be set to one of the values represented by the PXENV_STATUS_xxx\r
  constants. If the PXENV_EXIT_SUCCESS is returned, the parameter structure must contain the\r
  interface specific information.\r
  Description: This call, if successful, provides the network interface specific information such as the interface\r
  type at the link layer (Ethernet, Tokenring) and the link speed. This information can be used in the\r
  universal drivers such as NDIS or Miniport to communicate to the upper protocol modules.\r
  Note: UNDI follows the NDIS2 specification in giving this information. It is the responsibility of the\r
  universal driver to translate/convert this information into a format that is required in its specification\r
  or to suit the expectation of the upper level protocol modules.\r
  PXENV_START_UNDI, PXENV_UNDI_STARTUP and PXENV_UNDI_INITIALIZE must be called\r
  before the information provided is valid.\r
  typedef struct {\r
    PXENV_STATUS Status\r
    UINT8 IfaceType[16];\r
    UINT32 LinkSpeed;\r
    UINT32 ServiceFlags;\r
    UINT32 Reserved[4];\r
  } PXENV_UNDI_GET_NDIS_INFO_T;\r
  Set before calling API service\r
  N/A\r
  Returned from API service\r
  Status: See the PXENV_STATUS_xxx constants.\r
  IfaceType: Name of MAC type in ASCIIZ format. This is\r
  used by the universal NDIS driver to specify its driver type\r
  to the protocol driver.\r
  LinkSpeed: Defined in the NDIS 2.0 specification.\r
  ServiceFlags: Defined in the NDIS 2.0 specification.\r
  Reserved: Must be zero.\r
\r
  @param  SimpleNetworkDevice   Device instance\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r
EFI_STATUS\r
PxeUndiGetNdisInfo (\r
  IN     EFI_SIMPLE_NETWORK_DEV      *SimpleNetworkDevice,\r
  IN OUT PXENV_UNDI_GET_NDIS_INFO_T  *PxeUndiTable\r
  )\r
{\r
  return MakePxeCall (\r
          SimpleNetworkDevice,\r
          PxeUndiTable,\r
          sizeof (PXENV_UNDI_GET_NDIS_INFO_T),\r
          PXENV_UNDI_GET_NDIS_INFO\r
          );\r
}\r
\r
/**\r
  PXE\r
  UNDI ISR\r
  Op-Code: PXENV_UNDI_ISR (0014h)\r
  Input: Far pointer to a PXENV_UNDI_ISR_T parameter structure that has been initialized by the caller.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field in\r
  the parameter structure must be set to one of the values represented by the PXENV_STATUS_xxx\r
  constants.\r
  Description: This API function will be called at different levels of processing the interrupt. The FuncFlag field in\r
  the parameter block indicates the operation to be performed for the call. This field is filled with the\r
  status of that operation on return.\r
  Note: Interrupt Service Routine Operation:\r
  In this design the UNDI does not hook the interrupt for the Network Interface. Instead, the\r
  application or the protocol driver hooks the interrupt and calls UNDI with the PXENV_UNDI_ISR\r
  API call for interrupt verification (PXENV_UNDI_ISR_IN_START) and processing\r
  (PXENV_UNDI_ISR_IN_PROCESS and PXENV_UNDI_ISR_GET_NEXT).\r
  When the Network Interface HW generates an interrupt the protocol driver interrupt service\r
  routine (ISR) gets control and takes care of the interrupt processing at the PIC level. The ISR then\r
  calls the UNDI using the PXENV_UNDI_ISR API with the value PXENV_UNDI_ISR_IN_START for\r
  the FuncFlag parameter. At this time UNDI must disable the interrupts at the Network Interface\r
  level and read any status values required to further process the interrupt. UNDI must return as\r
  quickly as possible with one of the two values, PXENV_UNDI_ISR_OUT_OURS or\r
  PXENV_UNDI_ISR_OUT_NOT_OURS, for the parameter FuncFlag depending on whether the\r
  interrupt was generated by this particular Network Interface or not.\r
  If the value returned in FuncFlag is PXENV_UNDI_ISR_OUT_NOT_OURS, then the interrupt was\r
  not generated by our NIC, and interrupt processing is complete.\r
  If the value returned in FuncFlag is PXENV_UNDI_ISR_OUT_OURS, the protocol driver must start\r
  a handler thread and send an end-of-interrupt (EOI) command to the PIC. Interrupt processing is\r
  now complete.\r
  The protocol driver strategy routine will call UNDI using this same API with FuncFlag equal to\r
  PXENV_UNDI_ISR_IN_PROCESS. At this time UNDI must find the cause of this interrupt and\r
  return the status in the FuncFlag. It first checks if there is a frame received and if so it returns the\r
  first buffer pointer of that frame in the parameter block.\r
  The protocol driver calls UNDI repeatedly with the FuncFlag equal to\r
  PXENV_UNDI_ISR_IN_GET_NEXT to get all the buffers in a frame and also all the received\r
  frames in the queue. On this call, UNDI must remember the previous buffer given to the protoco,l\r
  remove it from the receive queue and recycle it. In case of a multi-buffered frame, if the previous\r
  buffer is not the last buffer in the frame it must return the next buffer in the frame in the parameter\r
  block. Otherwise it must return the first buffer in the next frame.\r
  If there is no received frame pending to be processed, UNDI processes the transmit completes and\r
  if there is no other interrupt status to be processed, UNDI re-enables the interrupt at the\r
  NETWORK INTERFACE level and returns PXENV_UNDI_ISR_OUT_DONE in the FuncFlag.\r
  IMPORTANT: It is possible for the protocol driver to be interrupted again while in the\r
  strategy routine when the UNDI re-enables interrupts.\r
\r
  @param  SimpleNetworkDevice   Device instance\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r
EFI_STATUS\r
PxeUndiIsr (\r
  IN     EFI_SIMPLE_NETWORK_DEV  *SimpleNetworkDevice,\r
  IN OUT PXENV_UNDI_ISR_T        *PxeUndiTable\r
  )\r
{\r
  return MakePxeCall (\r
          SimpleNetworkDevice,\r
          PxeUndiTable,\r
          sizeof (PXENV_UNDI_ISR_T),\r
          PXENV_UNDI_ISR\r
          );\r
}\r
\r
/**\r
  PXE\r
  STOP UNDI\r
  Op-Code: PXENV_STOP_UNDI (0015h)\r
  Input: Far pointer to a PXENV_STOP_UNDI_T parameter structure that has been initialized by the caller.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field in\r
  the parameter structure must be set to one of the values represented by the PXENV_STATUS_xxx\r
  constants.\r
  Description: This routine is responsible for unhooking the Int 1Ah service routine.\r
  Note: This API service must be called only once at the end of UNDI Option ROM boot. One of the valid\r
  status codes is PXENV_STATUS_KEEP. If this status is returned, UNDI must not be removed from\r
  base memory. Also, UNDI must not be removed from base memory if BC is not removed from base\r
  memory.\r
  Service cannot be used in protected mode.\r
  typedef struct {\r
    PXENV_STATUS Status;\r
  } PXENV_STOP_UNDI_T;\r
  Set before calling API service\r
  N/A\r
  Returned from API service\r
  Status: See the PXENV_STATUS_xxx constants.\r
\r
  @param  SimpleNetworkDevice   Device instance\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r
EFI_STATUS\r
PxeUndiStop (\r
  IN     EFI_SIMPLE_NETWORK_DEV  *SimpleNetworkDevice,\r
  IN OUT PXENV_STOP_UNDI_T       *PxeUndiTable\r
  )\r
{\r
  return MakePxeCall (\r
          SimpleNetworkDevice,\r
          PxeUndiTable,\r
          sizeof (PXENV_STOP_UNDI_T),\r
          PXENV_STOP_UNDI\r
          );\r
}\r
\r
/**\r
  PXE\r
  UNDI GET STATE\r
  Op-Code: PXENV_UNDI_GET_STATE (0015h)\r
  Input: Far pointer to a PXENV_UNDI_GET_STATE_T parameter.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field in\r
  the parameter structure must be set to one of the values represented by the PXENV_STATUS_xxx\r
  constants. The UNDI_STATE field in the parameter structure must be set to one of the valid state\r
  constants\r
  Description: This call can be used to obtain state of the UNDI engine in order to avoid issuing adverse call\r
  sequences\r
  typedef struct {\r
    #define PXE_UNDI_GET_STATE_STARTED 1\r
    #define PXE_UNDI_GET_STATE_INITIALIZED 2\r
    #define PXE_UNDI_GET_STATE_OPENED 3\r
    PXENV_STATUS Status;\r
    UINT8 UNDIstate;\r
  } PXENV_UNDI_GET_STATE_T;\r
  Set before calling API service\r
  N/A\r
  Returned from API service\r
  Status: See the PXENV_STATUS_xxx constants.\r
  State: See definitions of the state constants.\r
  Note. UNDI implementation is responsible for maintaining\r
  internal state machine.\r
  UNDI ISR\r
  Op-Code: PXENV_UNDI_ISR (0014h)\r
  Input: Far pointer to a t_PXENV_UNDI_ISR parameter structure that has been initialized by the caller.\r
  Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE must be returned in AX. The status field in\r
  the parameter structure must be set to one of the values represented by the PXENV_STATUS_xxx\r
  constants.\r
  Description: This API function will be called at different levels of processing the interrupt. The FuncFlag field in\r
  the parameter block indicates the operation to be performed for the call. This field is filled with the\r
  status of that operation on return.\r
\r
  @param  SimpleNetworkDevice   Device instance\r
  @param  PxeUndiTable          Point to structure which hold parameter and return value\r
                                for option ROM call.\r
\r
  @return Return value of PXE option ROM far call.\r
**/\r