nvdata.c

来自「EFI BIOS是Intel提出的下一代的BIOS标准。这里上传的Edk源代码是」· C语言 代码 · 共 183 行

/*++
Copyright (c) 2004 - 2005, Intel Corporation                                                         
All rights reserved. This program and the accompanying materials                          
are licensed and made available under the terms and conditions of the BSD License         
which 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.             

Module name:
  nvdata.c

Abstract:

Revision history:
  2000-Feb-03 M(f)J   Genesis.
--*/

#include "snp.h"

EFI_STATUS
pxe_nvdata_read (
  IN SNP_DRIVER *snp,
  IN UINTN      RegOffset,
  IN UINTN      NumBytes,
  IN OUT VOID   *BufferPtr
  )
/*++

Routine Description:
 This routine calls Undi to read the desired number of eeprom bytes.

Arguments:
  snp  - pointer to the snp driver structure
  RegOffset  - eeprom register value relative to the base address
  NumBytes  - number of bytes to read
  BufferPtr - pointer where to read into

Returns:

--*/
{
  PXE_DB_NVDATA *db;

  db                  = snp->db;
  snp->cdb.OpCode     = PXE_OPCODE_NVDATA;

  snp->cdb.OpFlags    = PXE_OPFLAGS_NVDATA_READ;

  snp->cdb.CPBsize    = PXE_CPBSIZE_NOT_USED;
  snp->cdb.CPBaddr    = PXE_CPBADDR_NOT_USED;

  snp->cdb.DBsize     = sizeof (PXE_DB_NVDATA);
  snp->cdb.DBaddr     = (UINT64)(UINTN) db;

  snp->cdb.StatCode   = PXE_STATCODE_INITIALIZE;
  snp->cdb.StatFlags  = PXE_STATFLAGS_INITIALIZE;
  snp->cdb.IFnum      = snp->if_num;
  snp->cdb.Control    = PXE_CONTROL_LAST_CDB_IN_LIST;

  //
  // Issue UNDI command and check result.
  //
  DEBUG ((EFI_D_NET, "\nsnp->undi.nvdata ()  "));

  (*snp->issue_undi32_command) ((UINT64)(UINTN) &snp->cdb);

  switch (snp->cdb.StatCode) {
  case PXE_STATCODE_SUCCESS:
    break;

  case PXE_STATCODE_UNSUPPORTED:
    DEBUG (
      (EFI_D_NET,
      "\nsnp->undi.nvdata()  %xh:%xh\n",
      snp->cdb.StatFlags,
      snp->cdb.StatCode)
      );

    return EFI_UNSUPPORTED;

  default:
    DEBUG (
      (EFI_D_NET,
      "\nsnp->undi.nvdata()  %xh:%xh\n",
      snp->cdb.StatFlags,
      snp->cdb.StatCode)
      );

    return EFI_DEVICE_ERROR;
  }

  EfiCopyMem (BufferPtr, db->Data.Byte + RegOffset, NumBytes);

  return EFI_SUCCESS;
}

EFI_STATUS
EFIAPI
snp_undi32_nvdata (
  IN EFI_SIMPLE_NETWORK_PROTOCOL *this,
  IN BOOLEAN                     ReadOrWrite,
  IN UINTN                       RegOffset,
  IN UINTN                       NumBytes,
  IN OUT VOID                    *BufferPtr
  )
/*++

Routine Description:
 This is an interface call provided by SNP.
 It does the basic checking on the input parameters and retrieves snp structure
 and then calls the read_nvdata() call which does the actual reading

Arguments:
  this  - context pointer
  ReadOrWrite - true for reading and false for writing
  RegOffset  - eeprom register relative to the base
  NumBytes - how many bytes to read
  BufferPtr - address of memory to read into

Returns:

--*/
{
  SNP_DRIVER  *snp;

  //
  // Get pointer to SNP driver instance for *this.
  //
  if (this == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  snp = EFI_SIMPLE_NETWORK_DEV_FROM_THIS (this);

  if (snp == NULL) {
    return EFI_DEVICE_ERROR;
  }
  //
  // Return error if the SNP is not initialized.
  //
  switch (snp->mode.State) {
  case EfiSimpleNetworkInitialized:
    break;

  case EfiSimpleNetworkStopped:
    return EFI_NOT_STARTED;

  case EfiSimpleNetworkStarted:
    return EFI_DEVICE_ERROR;

  default:
    return EFI_DEVICE_ERROR;
  }
  //
  // Return error if non-volatile memory variables are not valid.
  //
  if (snp->mode.NvRamSize == 0 || snp->mode.NvRamAccessSize == 0) {
    return EFI_UNSUPPORTED;
  }
  //
  // Check for invalid parameter combinations.
  //
  if ((NumBytes == 0) ||
      (BufferPtr == NULL) ||
      (RegOffset >= snp->mode.NvRamSize) ||
      (RegOffset + NumBytes > snp->mode.NvRamSize) ||
      (NumBytes % snp->mode.NvRamAccessSize != 0) ||
      (RegOffset % snp->mode.NvRamAccessSize != 0)
      ) {
    return EFI_INVALID_PARAMETER;
  }
  //
  // check the implementation flags of undi if we can write the nvdata!
  //
  if (!ReadOrWrite) {
    return EFI_UNSUPPORTED;
  } else {
    return pxe_nvdata_read (snp, RegOffset, NumBytes, BufferPtr);
  }
}