QuarkPlatformPkg/PlatformInit: Clear memory based on TCG MOR request

[mirror_edk2.git] / QuarkPlatformPkg / Platform / Pei / PlatformInit / MemoryCallback.c

diff --git a/QuarkPlatformPkg/Platform/Pei/PlatformInit/MemoryCallback.c b/QuarkPlatformPkg/Platform/Pei/PlatformInit/MemoryCallback.c
index 728e2b1f6b69f5f66bf7d766be5bd04f11199ebc..d5fb94195d4011e0b4803a3b08495f49237bc1c2 100644 (file)
--- a/QuarkPlatformPkg/Platform/Pei/PlatformInit/MemoryCallback.c
+++ b/QuarkPlatformPkg/Platform/Pei/PlatformInit/MemoryCallback.c
@@ -7,7 +7,7 @@ following action is performed in this file,
   4. Set MTRR for PEI\r
   5. Create FV HOB and Flash HOB\r
 \r
-Copyright (c) 2013 Intel Corporation.\r
+Copyright (c) 2013 - 2016, Intel Corporation.\r
 \r
 This program and the accompanying materials\r
 are licensed and made available under the terms and conditions of the BSD License\r
@@ -108,6 +108,9 @@ MemoryDiscoveredPpiNotifyCallback (
   UINT8                                 CpuAddressWidth;\r
   UINT32                                RegEax;\r
   MTRR_SETTINGS                         MtrrSettings;\r
+  EFI_PEI_READ_ONLY_VARIABLE2_PPI       *VariableServices;\r
+  UINT8                                 MorControl;\r
+  UINTN                                 DataSize;\r
 \r
   DEBUG ((EFI_D_INFO, "Platform PEIM Memory Callback\n"));\r
 \r
@@ -151,6 +154,52 @@ MemoryDiscoveredPpiNotifyCallback (
 \r
   PERF_END (NULL, "SetCache", NULL, 0);\r
 \r
+  //\r
+  // Get necessary PPI\r
+  //\r
+  Status = PeiServicesLocatePpi (\r
+             &gEfiPeiReadOnlyVariable2PpiGuid,           // GUID\r
+             0,                                          // INSTANCE\r
+             NULL,                                       // EFI_PEI_PPI_DESCRIPTOR\r
+             (VOID **)&VariableServices                  // PPI\r
+             );\r
+  ASSERT_EFI_ERROR (Status);\r
+\r
+  //\r
+  // Detect MOR request by the OS.\r
+  //\r
+  MorControl = 0;\r
+  DataSize = sizeof (MorControl);\r
+  Status = VariableServices->GetVariable (\r
+                               VariableServices,\r
+                               MEMORY_OVERWRITE_REQUEST_VARIABLE_NAME,\r
+                               &gEfiMemoryOverwriteControlDataGuid,\r
+                               NULL,\r
+                               &DataSize,\r
+                               &MorControl\r
+                               );\r
+  //\r
+  // If OS requested a memory overwrite perform it now for Embedded SRAM\r
+  //\r
+  if (MOR_CLEAR_MEMORY_VALUE (MorControl)) {\r
+    DEBUG ((EFI_D_INFO, "Clear Embedded SRAM per MOR request.\n"));\r
+    if (PcdGet32 (PcdESramMemorySize) > 0) {\r
+      if (PcdGet32 (PcdEsramStage1Base) == 0) {\r
+        //\r
+        // ZeroMem() generates an ASSERT() if Buffer parameter is NULL.\r
+        // Clear byte at 0 and start clear operation at address 1.\r
+        //\r
+        *(UINT8 *)(0) = 0;\r
+        ZeroMem ((VOID *)1, (UINTN)PcdGet32 (PcdESramMemorySize) - 1);\r
+      } else {\r
+        ZeroMem (\r
+          (VOID *)(UINTN)PcdGet32 (PcdEsramStage1Base),\r
+          (UINTN)PcdGet32 (PcdESramMemorySize)\r
+          );\r
+      }\r
+    }\r
+  }\r
+\r
   //\r
   // Install PeiReset for PeiResetSystem service\r
   //\r