Add logic to validate variable before use it.

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

diff --git a/Nt32Pkg/WinNtAutoScanPei/WinNtAutoScan.c b/Nt32Pkg/WinNtAutoScanPei/WinNtAutoScan.c
index e55bc6f29bec2c07785c376c3ddb9343724edbfb..ab5fd0f3f1ac279b55358feb4dcc0f44efbdebcb 100644 (file)
--- a/Nt32Pkg/WinNtAutoScanPei/WinNtAutoScan.c
+++ b/Nt32Pkg/WinNtAutoScanPei/WinNtAutoScan.c
@@ -1,7 +1,7 @@
 /**@file\r
 \r
-Copyright (c) 2006, Intel Corporation                                                         \r
-All rights reserved. This program and the accompanying materials                          \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
@@ -28,6 +28,10 @@ Revision History
 // 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
@@ -36,6 +40,62 @@ Revision History
 #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
@@ -63,6 +123,9 @@ Returns:
   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
@@ -116,6 +179,46 @@ Returns:
   // Build the CPU hob with 36-bit addressing and 16-bits of IO space.\r
   //\r
   BuildCpuHob (36, 16);\r
-  \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