OvmfPkg: PlatformPei: lifecycle fixes for the LockBox area

[mirror_edk2.git] / OvmfPkg / PlatformPei / MemDetect.c

diff --git a/OvmfPkg/PlatformPei/MemDetect.c b/OvmfPkg/PlatformPei/MemDetect.c
index 37030e6898390fcbd2e88ffe5d71363f546ba1b3..15b279e4456c525ab18912bb4aafa096ad0204a3 100644 (file)
--- a/OvmfPkg/PlatformPei/MemDetect.c
+++ b/OvmfPkg/PlatformPei/MemDetect.c
@@ -24,6 +24,7 @@ Module Name:
 //\r
 // The Library classes this module consumes\r
 //\r
+#include <Library/BaseMemoryLib.h>\r
 #include <Library/DebugLib.h>\r
 #include <Library/HobLib.h>\r
 #include <Library/IoLib.h>\r
@@ -218,4 +219,26 @@ InitializeRamRegions (
       );\r
 #endif\r
   }\r
+\r
+  if (mBootMode != BOOT_ON_S3_RESUME) {\r
+    //\r
+    // Reserve the lock box storage area\r
+    //\r
+    // Since this memory range will be used on S3 resume, it must be\r
+    // reserved as ACPI NVS.\r
+    //\r
+    // If S3 is unsupported, then various drivers might still write to the\r
+    // LockBox area. We ought to prevent DXE from serving allocation requests\r
+    // such that they would overlap the LockBox storage.\r
+    //\r
+    ZeroMem (\r
+      (VOID*)(UINTN) PcdGet32 (PcdOvmfLockBoxStorageBase),\r
+      (UINTN) PcdGet32 (PcdOvmfLockBoxStorageSize)\r
+      );\r
+    BuildMemoryAllocationHob (\r
+      (EFI_PHYSICAL_ADDRESS)(UINTN) PcdGet32 (PcdOvmfLockBoxStorageBase),\r
+      (UINT64)(UINTN) PcdGet32 (PcdOvmfLockBoxStorageSize),\r
+      mS3Supported ? EfiACPIMemoryNVS : EfiBootServicesData\r
+      );\r
+  }\r
 }\r