Add logic to validate variable before use it.

[mirror_edk2.git] / Nt32Pkg / WinNtAutoScanPei / WinNtAutoScan.c

/**@file\r
\r
Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>\r
This program and the accompanying materials                          \r
are licensed and made available under the terms and conditions of the BSD License         \r
which accompanies this distribution.  The 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
Module Name:\r
  WinNtAutoscan.c\r
\r
Abstract:\r
  This PEIM to abstract memory auto-scan in a Windows NT environment.\r
\r
Revision History\r
\r
**/\r
\r
//\r
// The package level header files this module uses\r
//\r
#include <PiPei.h>\r
#include <WinNtPeim.h>\r
//\r
// The protocols, PPI and GUID defintions for this module\r
//\r
#include <Ppi/NtAutoscan.h>\r
#include <Ppi/ReadOnlyVariable2.h>\r
\r
#include <Guid/MemoryTypeInformation.h>\r
\r
//\r
// The Library classes this module consumes\r
//\r
#include <Library/DebugLib.h>\r
#include <Library/PeimEntryPoint.h>\r
#include <Library/HobLib.h>\r
#include <Library/PeiServicesLib.h>\r
\r
EFI_MEMORY_TYPE_INFORMATION mDefaultMemoryTypeInformation[] = {\r
  { EfiReservedMemoryType,  0x0004 },\r
  { EfiRuntimeServicesCode, 0x0040 },\r
  { EfiRuntimeServicesData, 0x0040 },\r
  { EfiBootServicesCode,    0x0300 },\r
  { EfiBootServicesData,    0x1000 },\r
  { EfiMaxMemoryType,       0      }\r
};\r
\r
/**\r
   Validate variable data for the MemoryTypeInformation. \r
\r
   @param MemoryData       Variable data.\r
   @param MemoryDataSize   Variable data length.\r
   \r
   @return TRUE            The variable data is valid.\r
   @return FALSE           The variable data is invalid.\r
\r
**/\r
BOOLEAN\r
ValidateMemoryTypeInfoVariable (\r
  IN EFI_MEMORY_TYPE_INFORMATION      *MemoryData,\r
  IN UINTN                            MemoryDataSize\r
  )\r
{\r
  UINTN                       Count;\r
  UINTN                       Index;\r
\r
  // Check the input parameter.\r
  if (MemoryData == NULL) {\r
    return FALSE;\r
  }\r
\r
  // Get Count\r
  Count = MemoryDataSize / sizeof (*MemoryData);\r
\r
  // Check Size\r
  if (Count * sizeof(*MemoryData) != MemoryDataSize) {\r
    return FALSE;\r
  }\r
\r
  // Check last entry type filed.\r
  if (MemoryData[Count - 1].Type != EfiMaxMemoryType) {\r
    return FALSE;\r
  }\r
\r
  // Check the type filed.\r
  for (Index = 0; Index < Count - 1; Index++) {\r
    if (MemoryData[Index].Type >= EfiMaxMemoryType) {\r
      return FALSE;\r
    }\r
  }\r
\r
  return TRUE;\r
}\r
\r
EFI_STATUS\r
EFIAPI\r
PeimInitializeWinNtAutoScan (\r
  IN       EFI_PEI_FILE_HANDLE       FileHandle,\r
  IN CONST EFI_PEI_SERVICES          **PeiServices\r
  )\r
/*++\r
\r
Routine Description:\r
  Perform a call-back into the SEC simulator to get a memory value\r
\r
Arguments:\r
  FfsHeader   - General purpose data available to every PEIM\r
  PeiServices - General purpose services available to every PEIM.\r
    \r
Returns:\r
  None\r
\r
--*/\r
{\r
  EFI_STATUS                  Status;\r
  EFI_PEI_PPI_DESCRIPTOR      *PpiDescriptor;\r
  PEI_NT_AUTOSCAN_PPI         *PeiNtService;\r
  UINT64                      MemorySize;\r
  EFI_PHYSICAL_ADDRESS        MemoryBase;\r
  UINTN                       Index;\r
  EFI_RESOURCE_ATTRIBUTE_TYPE Attributes;\r
  EFI_PEI_READ_ONLY_VARIABLE2_PPI       *Variable;\r
  UINTN                                 DataSize;\r
  EFI_MEMORY_TYPE_INFORMATION           MemoryData [EfiMaxMemoryType + 1];\r
\r
\r
  DEBUG ((EFI_D_ERROR, "NT 32 Autoscan PEIM Loaded\n"));\r
\r
  //\r
  // Get the PEI NT Autoscan PPI\r
  //\r
  Status = PeiServicesLocatePpi (\r
             &gPeiNtAutoScanPpiGuid, // GUID\r
             0,                      // INSTANCE\r
             &PpiDescriptor,         // EFI_PEI_PPI_DESCRIPTOR\r
             (VOID**)&PeiNtService           // PPI\r
             );\r
  ASSERT_EFI_ERROR (Status);\r
\r
  Index = 0;\r
  do {\r
    Status = PeiNtService->NtAutoScan (Index, &MemoryBase, &MemorySize);\r
    if (!EFI_ERROR (Status)) {\r
      Attributes =\r
        (\r
          EFI_RESOURCE_ATTRIBUTE_PRESENT |\r
          EFI_RESOURCE_ATTRIBUTE_INITIALIZED |\r
          EFI_RESOURCE_ATTRIBUTE_UNCACHEABLE |\r
          EFI_RESOURCE_ATTRIBUTE_WRITE_COMBINEABLE |\r
          EFI_RESOURCE_ATTRIBUTE_WRITE_THROUGH_CACHEABLE |\r
          EFI_RESOURCE_ATTRIBUTE_WRITE_BACK_CACHEABLE\r
        );\r
\r
      if (Index == 0) {\r
        //\r
        // Register the memory with the PEI Core\r
        //\r
        Status = PeiServicesInstallPeiMemory (MemoryBase, MemorySize);\r
        ASSERT_EFI_ERROR (Status);\r
\r
        Attributes |= EFI_RESOURCE_ATTRIBUTE_TESTED;\r
      }\r
      \r
      BuildResourceDescriptorHob (\r
        EFI_RESOURCE_SYSTEM_MEMORY,\r
        Attributes,\r
        MemoryBase,\r
        MemorySize\r
        );\r
    }\r
    Index++;\r
  } while (!EFI_ERROR (Status));\r
\r
  //\r
  // Build the CPU hob with 36-bit addressing and 16-bits of IO space.\r
  //\r
  BuildCpuHob (36, 16);\r
\r
  //\r
  // Build GUIDed Hob that contains the Memory Type Information array\r
  //\r
  Status = PeiServicesLocatePpi (\r
             &gEfiPeiReadOnlyVariable2PpiGuid,\r
             0,\r
             NULL,\r
             (VOID **)&Variable\r
             );\r
  ASSERT_EFI_ERROR (Status);\r
\r
  DataSize = sizeof (MemoryData);\r
  Status = Variable->GetVariable (\r
                       Variable,\r
                       EFI_MEMORY_TYPE_INFORMATION_VARIABLE_NAME,\r
                       &gEfiMemoryTypeInformationGuid,\r
                       NULL,\r
                       &DataSize,\r
                       &MemoryData\r
                       );\r
  if (EFI_ERROR (Status) || !ValidateMemoryTypeInfoVariable(MemoryData, DataSize)) {\r
    //\r
    // Create Memory Type Information HOB\r
    //\r
    BuildGuidDataHob (\r
      &gEfiMemoryTypeInformationGuid,\r
      mDefaultMemoryTypeInformation,\r
      sizeof(mDefaultMemoryTypeInformation)\r
      );\r
  } else {\r
    //\r
    // Create Memory Type Information HOB\r
    //\r
    BuildGuidDataHob (\r
      &gEfiMemoryTypeInformationGuid,\r
      MemoryData,\r
      DataSize\r
      );\r
  }\r
\r
  return Status;\r
}\r