Add initial version of Open Virtual Machine Firmware (OVMF) platform.

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

/**@file\r
  Memory Detection for Virtual Machines.\r
\r
  Copyright (c) 2006 - 2009, Intel Corporation\r
  All rights reserved. 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
\r
  MemDetect.c\r
\r
**/\r
\r
//\r
// The package level header files this module uses\r
//\r
#include <PiPei.h>\r
\r
//\r
// The Library classes this module consumes\r
//\r
#include <Library/DebugLib.h>\r
#include <Library/HobLib.h>\r
#include <Library/IoLib.h>\r
#include <Library/PeimEntryPoint.h>\r
#include <Library/ResourcePublicationLib.h>\r
\r
#include "Platform.h"\r
#include "Cmos.h"\r
\r
STATIC\r
UINTN\r
GetSystemMemorySize (\r
  )\r
{\r
  UINT8 Cmos0x34;\r
  UINT8 Cmos0x35;\r
\r
  //\r
  // CMOS 0x34/0x35 specifies the system memory above 16 MB.\r
  // * CMOS(0x35) is the high byte\r
  // * CMOS(0x34) is the low byte\r
  // * The size is specified in 64kb chunks\r
  // * Since this is memory above 16MB, the 16MB must be added\r
  //   into the calculation to get the total memory size.\r
  //\r
\r
  Cmos0x34 = (UINT8) CmosRead8 (0x34);\r
  Cmos0x35 = (UINT8) CmosRead8 (0x35);\r
\r
  return ((((Cmos0x35 << 8) + Cmos0x34) << 16) + SIZE_16MB);\r
}\r
\r
\r
/**\r
  Peform Memory Detection\r
\r
  @return EFI_SUCCESS     The PEIM initialized successfully.\r
\r
**/\r
EFI_STATUS\r
MemDetect (\r
  )\r
{\r
  EFI_STATUS                  Status;\r
  EFI_PHYSICAL_ADDRESS        MemoryBase;\r
  UINT64                      MemorySize;\r
  UINT64                      TotalMemorySize;\r
\r
  DEBUG ((EFI_D_ERROR, "MemDetect called\n"));\r
\r
  //\r
  // Determine total memory size available\r
  //\r
  TotalMemorySize = (UINT64)GetSystemMemorySize ();\r
\r
  MemoryBase = 0x800000;\r
  MemorySize = TotalMemorySize - MemoryBase - 0x100000;\r
\r
  //\r
  // Publish this memory to the PEI Core\r
  //\r
  Status = PublishSystemMemory(MemoryBase, MemorySize);\r
  ASSERT_EFI_ERROR (Status);\r
\r
  //\r
  // Create memory HOBs\r
  //\r
  AddMemoryBaseSizeHob (MemoryBase, MemorySize);\r
  AddMemoryRangeHob (0x100000, 0x800000);\r
  AddMemoryRangeHob (0x000000, 0x0A0000);\r
\r
  return EFI_SUCCESS;\r
}\r
\r