NetworkPkg/SnpDxe/Nvdata.c

   1 /** @file
   2    Implementation of reading and writing operations on the NVRAM device
   3    attached to a network interface.
   4
   5 Copyright (c) 2004 - 2018, Intel Corporation. All rights reserved.<BR>
   6 SPDX-License-Identifier: BSD-2-Clause-Patent
   7
   8 **/
   9
  10 #include "Snp.h"
  11
  12
  13 /**
  14   This routine calls Undi to read the desired number of eeprom bytes.
  15
  16   @param  Snp          pointer to the snp driver structure
  17   @param  Offset       eeprom register value relative to the base address
  18   @param  BufferSize   number of bytes to read
  19   @param  Buffer       pointer where to read into
  20
  21   @retval EFI_SUCCESS           The NVRAM access was performed.
  22   @retval EFI_INVALID_PARAMETER Invalid UNDI command.
  23   @retval EFI_UNSUPPORTED       Command is not supported by UNDI.
  24   @retval EFI_DEVICE_ERROR      Fail to execute UNDI command.
  25
  26 **/
  27 EFI_STATUS
  28 PxeNvDataRead (
  29   IN SNP_DRIVER *Snp,
  30   IN UINTN      Offset,
  31   IN UINTN      BufferSize,
  32   IN OUT VOID   *Buffer
  33   )
  34 {
  35   PXE_DB_NVDATA *Db;
  36
  37   Db                  = Snp->Db;
  38   Snp->Cdb.OpCode     = PXE_OPCODE_NVDATA;
  39
  40   Snp->Cdb.OpFlags    = PXE_OPFLAGS_NVDATA_READ;
  41
  42   Snp->Cdb.CPBsize    = PXE_CPBSIZE_NOT_USED;
  43   Snp->Cdb.CPBaddr    = PXE_CPBADDR_NOT_USED;
  44
  45   Snp->Cdb.DBsize     = (UINT16) sizeof (PXE_DB_NVDATA);
  46   Snp->Cdb.DBaddr     = (UINT64)(UINTN) Db;
  47
  48   Snp->Cdb.StatCode   = PXE_STATCODE_INITIALIZE;
  49   Snp->Cdb.StatFlags  = PXE_STATFLAGS_INITIALIZE;
  50   Snp->Cdb.IFnum      = Snp->IfNum;
  51   Snp->Cdb.Control    = PXE_CONTROL_LAST_CDB_IN_LIST;
  52
  53   //
  54   // Issue UNDI command and check result.
  55   //
  56   DEBUG ((EFI_D_NET, "\nsnp->undi.nvdata ()  "));
  57
  58   (*Snp->IssueUndi32Command) ((UINT64)(UINTN) &Snp->Cdb);
  59
  60   switch (Snp->Cdb.StatCode) {
  61   case PXE_STATCODE_SUCCESS:
  62     break;
  63
  64   case PXE_STATCODE_UNSUPPORTED:
  65     DEBUG (
  66       (EFI_D_NET,
  67       "\nsnp->undi.nvdata()  %xh:%xh\n",
  68       Snp->Cdb.StatFlags,
  69       Snp->Cdb.StatCode)
  70       );
  71
  72     return EFI_UNSUPPORTED;
  73
  74   default:
  75     DEBUG (
  76       (EFI_D_NET,
  77       "\nsnp->undi.nvdata()  %xh:%xh\n",
  78       Snp->Cdb.StatFlags,
  79       Snp->Cdb.StatCode)
  80       );
  81
  82     return EFI_DEVICE_ERROR;
  83   }
  84
  85   ASSERT (Offset < sizeof (Db->Data));
  86
  87   CopyMem (Buffer, &Db->Data.Byte[Offset], BufferSize);
  88
  89   return EFI_SUCCESS;
  90 }
  91
  92
  93 /**
  94   Performs read and write operations on the NVRAM device attached to a network
  95   interface.
  96
  97   This function performs read and write operations on the NVRAM device attached
  98   to a network interface. If ReadWrite is TRUE, a read operation is performed.
  99   If ReadWrite is FALSE, a write operation is performed. Offset specifies the
 100   byte offset at which to start either operation. Offset must be a multiple of
 101   NvRamAccessSize , and it must have a value between zero and NvRamSize.
 102   BufferSize specifies the length of the read or write operation. BufferSize must
 103   also be a multiple of NvRamAccessSize, and Offset + BufferSize must not exceed
 104   NvRamSize.
 105   If any of the above conditions is not met, then EFI_INVALID_PARAMETER will be
 106   returned.
 107   If all the conditions are met and the operation is "read," the NVRAM device
 108   attached to the network interface will be read into Buffer and EFI_SUCCESS
 109   will be returned. If this is a write operation, the contents of Buffer will be
 110   used to update the contents of the NVRAM device attached to the network
 111   interface and EFI_SUCCESS will be returned.
 112
 113   It does the basic checking on the input parameters and retrieves snp structure
 114   and then calls the read_nvdata() call which does the actual reading
 115
 116   @param This       A pointer to the EFI_SIMPLE_NETWORK_PROTOCOL instance.
 117   @param ReadWrite  TRUE for read operations, FALSE for write operations.
 118   @param Offset     Byte offset in the NVRAM device at which to start the read or
 119                     write operation. This must be a multiple of NvRamAccessSize
 120                     and less than NvRamSize. (See EFI_SIMPLE_NETWORK_MODE)
 121   @param BufferSize The number of bytes to read or write from the NVRAM device.
 122                     This must also be a multiple of NvramAccessSize.
 123   @param Buffer     A pointer to the data buffer.
 124
 125   @retval EFI_SUCCESS           The NVRAM access was performed.
 126   @retval EFI_NOT_STARTED       The network interface has not been started.
 127   @retval EFI_INVALID_PARAMETER One or more of the following conditions is TRUE:
 128                                 * The This parameter is NULL
 129                                 * The This parameter does not point to a valid
 130                                   EFI_SIMPLE_NETWORK_PROTOCOL  structure
 131                                 * The Offset parameter is not a multiple of
 132                                   EFI_SIMPLE_NETWORK_MODE.NvRamAccessSize
 133                                 * The Offset parameter is not less than
 134                                   EFI_SIMPLE_NETWORK_MODE.NvRamSize
 135                                 * The BufferSize parameter is not a multiple of
 136                                   EFI_SIMPLE_NETWORK_MODE.NvRamAccessSize
 137                                 * The Buffer parameter is NULL
 138   @retval EFI_DEVICE_ERROR      The command could not be sent to the network
 139                                 interface.
 140   @retval EFI_UNSUPPORTED       This function is not supported by the network
 141                                 interface.
 142
 143 **/
 144 EFI_STATUS
 145 EFIAPI
 146 SnpUndi32NvData (
 147   IN EFI_SIMPLE_NETWORK_PROTOCOL *This,
 148   IN BOOLEAN                     ReadWrite,
 149   IN UINTN                       Offset,
 150   IN UINTN                       BufferSize,
 151   IN OUT VOID                    *Buffer
 152   )
 153 {
 154   SNP_DRIVER  *Snp;
 155   EFI_TPL     OldTpl;
 156   EFI_STATUS  Status;
 157
 158   //
 159   // Get pointer to SNP driver instance for *this.
 160   //
 161   if (This == NULL) {
 162     return EFI_INVALID_PARAMETER;
 163   }
 164
 165   Snp = EFI_SIMPLE_NETWORK_DEV_FROM_THIS (This);
 166
 167   OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
 168
 169   //
 170   // Return error if the SNP is not initialized.
 171   //
 172   switch (Snp->Mode.State) {
 173   case EfiSimpleNetworkInitialized:
 174     break;
 175
 176   case EfiSimpleNetworkStopped:
 177     Status = EFI_NOT_STARTED;
 178     goto ON_EXIT;
 179
 180   default:
 181     Status = EFI_DEVICE_ERROR;
 182     goto ON_EXIT;
 183   }
 184   //
 185   // Return error if non-volatile memory variables are not valid.
 186   //
 187   if (Snp->Mode.NvRamSize == 0 || Snp->Mode.NvRamAccessSize == 0) {
 188     Status = EFI_UNSUPPORTED;
 189     goto ON_EXIT;
 190   }
 191   //
 192   // Check for invalid parameter combinations.
 193   //
 194   if ((BufferSize == 0) ||
 195       (Buffer == NULL) ||
 196       (Offset >= Snp->Mode.NvRamSize) ||
 197       (Offset + BufferSize > Snp->Mode.NvRamSize) ||
 198       (BufferSize % Snp->Mode.NvRamAccessSize != 0) ||
 199       (Offset % Snp->Mode.NvRamAccessSize != 0)
 200       ) {
 201     Status = EFI_INVALID_PARAMETER;
 202     goto ON_EXIT;
 203   }
 204   //
 205   // check the implementation flags of undi if we can write the nvdata!
 206   //
 207   if (!ReadWrite) {
 208     Status = EFI_UNSUPPORTED;
 209   } else {
 210     Status = PxeNvDataRead (Snp, Offset, BufferSize, Buffer);
 211   }
 212
 213 ON_EXIT:
 214   gBS->RestoreTPL (OldTpl);
 215
 216   return Status;
 217 }