audk/Nt32Pkg/MiscSubClassPlatformDxe/MiscSystemOptionStringFunction.c

/** @file
  BIOS system option string boot time changes.
  SMBIOS type 12.
  
Copyright (c) 2009 - 2011, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "MiscSubclassDriver.h"


/**
  This function makes boot time changes to the contents of the
  MiscSystemOptionString (Type 12).

  @param  RecordData                 Pointer to copy of RecordData from the Data Table.  

  @retval EFI_SUCCESS                All parameters were valid.
  @retval EFI_UNSUPPORTED            Unexpected RecordType value.
  @retval EFI_INVALID_PARAMETER      Invalid parameter was found.

**/
MISC_SMBIOS_TABLE_FUNCTION(SystemOptionString)
{
  CHAR8                             *OptionalStrStart;
  UINTN                             OptStrLen;
  EFI_STRING                        OptionString;
  EFI_STATUS                        Status;
  STRING_REF                        TokenToGet;
  EFI_SMBIOS_HANDLE                 SmbiosHandle;
  SMBIOS_TABLE_TYPE12               *SmbiosRecord;

  //
  // First check for invalid parameters.
  //
  if (RecordData == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  TokenToGet = STRING_TOKEN (STR_MISC_SYSTEM_OPTION_STRING);
  OptionString = HiiGetPackageString(&gEfiCallerIdGuid, TokenToGet, NULL);
  OptStrLen = StrLen(OptionString);
  if (OptStrLen > SMBIOS_STRING_MAX_LENGTH) {
    return EFI_UNSUPPORTED;
  }
 
  //
  // Two zeros following the last string.
  //
  SmbiosRecord = AllocatePool(sizeof (SMBIOS_TABLE_TYPE12) + OptStrLen + 1 + 1);
  ZeroMem(SmbiosRecord, sizeof (SMBIOS_TABLE_TYPE12) + OptStrLen + 1 + 1);

  SmbiosRecord->Hdr.Type = EFI_SMBIOS_TYPE_SYSTEM_CONFIGURATION_OPTIONS;
  SmbiosRecord->Hdr.Length = sizeof (SMBIOS_TABLE_TYPE12);
  //
  // Make handle chosen by smbios protocol.add automatically.
  //
  SmbiosRecord->Hdr.Handle = 0;  

  SmbiosRecord->StringCount = 1;
  OptionalStrStart = (CHAR8*) (SmbiosRecord + 1);
  UnicodeStrToAsciiStr(OptionString, OptionalStrStart);
  //
  // Now we have got the full smbios record, call smbios protocol to add this record.
  //
  Status = AddSmbiosRecord (Smbios, &SmbiosHandle, (EFI_SMBIOS_TABLE_HEADER *) SmbiosRecord);

  FreePool(SmbiosRecord);
  return Status;
}