1 files changed, 100 insertions, 0 deletions
diff --git a/OvmfPkg/PlatformPei/MemDetect.c b/OvmfPkg/PlatformPei/MemDetect.c
new file mode 100644
index 0000000000..daa83a0014
--- /dev/null
+++ b/OvmfPkg/PlatformPei/MemDetect.c
@@ -0,0 +1,100 @@
+/**@file
+  Memory Detection for Virtual Machines.
+
+  Copyright (c) 2006 - 2009, Intel Corporation
+  All rights reserved. This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+Module Name:
+
+  MemDetect.c
+
+**/
+
+//
+// The package level header files this module uses
+//
+#include <PiPei.h>
+
+//
+// The Library classes this module consumes
+//
+#include <Library/DebugLib.h>
+#include <Library/HobLib.h>
+#include <Library/IoLib.h>
+#include <Library/PeimEntryPoint.h>
+#include <Library/ResourcePublicationLib.h>
+
+#include "Platform.h"
+#include "Cmos.h"
+
+STATIC
+UINTN
+GetSystemMemorySize (
+  )
+{
+  UINT8 Cmos0x34;
+  UINT8 Cmos0x35;
+
+  //
+  // CMOS 0x34/0x35 specifies the system memory above 16 MB.
+  // * CMOS(0x35) is the high byte
+  // * CMOS(0x34) is the low byte
+  // * The size is specified in 64kb chunks
+  // * Since this is memory above 16MB, the 16MB must be added
+  //   into the calculation to get the total memory size.
+  //
+
+  Cmos0x34 = (UINT8) CmosRead8 (0x34);
+  Cmos0x35 = (UINT8) CmosRead8 (0x35);
+
+  return ((((Cmos0x35 << 8) + Cmos0x34) << 16) + SIZE_16MB);
+}
+
+
+/**
+  Peform Memory Detection
+
+  @return EFI_SUCCESS     The PEIM initialized successfully.
+
+**/
+EFI_STATUS
+MemDetect (
+  )
+{
+  EFI_STATUS                  Status;
+  EFI_PHYSICAL_ADDRESS        MemoryBase;
+  UINT64                      MemorySize;
+  UINT64                      TotalMemorySize;
+
+  DEBUG ((EFI_D_ERROR, "MemDetect called\n"));
+
+  //
+  // Determine total memory size available
+  //
+  TotalMemorySize = (UINT64)GetSystemMemorySize ();
+
+  MemoryBase = 0x800000;
+  MemorySize = TotalMemorySize - MemoryBase - 0x100000;
+
+  //
+  // Publish this memory to the PEI Core
+  //
+  Status = PublishSystemMemory(MemoryBase, MemorySize);
+  ASSERT_EFI_ERROR (Status);
+
+  //
+  // Create memory HOBs
+  //
+  AddMemoryBaseSizeHob (MemoryBase, MemorySize);
+  AddMemoryRangeHob (0x100000, 0x800000);
+  AddMemoryRangeHob (0x000000, 0x0A0000);
+
+  return EFI_SUCCESS;
+}
+