OvmfPkg/PlatformInitLib: Add PlatformGetLowMemoryCB

[mirror_edk2.git] / OvmfPkg / Library / PeilessStartupLib / Hob.c

/** @file\r
  Main SEC phase code. Handles initial TDX Hob List Processing\r
\r
  Copyright (c) 2008, Intel Corporation. All rights reserved.<BR>\r
  (C) Copyright 2016 Hewlett Packard Enterprise Development LP<BR>\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include <PiPei.h>\r
#include <Library/BaseLib.h>\r
#include <Library/DebugLib.h>\r
#include <Library/HobLib.h>\r
#include <Library/BaseMemoryLib.h>\r
#include <Library/PciLib.h>\r
#include <Library/PrePiLib.h>\r
#include <Library/QemuFwCfgLib.h>\r
#include <IndustryStandard/Tdx.h>\r
#include <IndustryStandard/UefiTcgPlatform.h>\r
#include <Library/PlatformInitLib.h>\r
#include <OvmfPlatforms.h>\r
#include <Pi/PrePiHob.h>\r
#include "PeilessStartupInternal.h"\r
\r
/**\r
 * Construct the HobList in SEC phase.\r
 *\r
 * @return EFI_SUCCESS      Successfully construct the firmware hoblist.\r
 * @return EFI_NOT_FOUND    Cannot find a memory region to be the fw hoblist.\r
 */\r
EFI_STATUS\r
EFIAPI\r
ConstructSecHobList (\r
  )\r
{\r
  UINT32  LowMemorySize;\r
  UINT32  LowMemoryStart;\r
\r
  EFI_HOB_HANDOFF_INFO_TABLE  *HobList;\r
  EFI_HOB_PLATFORM_INFO       PlatformInfoHob;\r
\r
  ZeroMem (&PlatformInfoHob, sizeof (PlatformInfoHob));\r
  PlatformInfoHob.HostBridgeDevId = PciRead16 (OVMF_HOSTBRIDGE_DID);\r
  PlatformGetSystemMemorySizeBelow4gb (&PlatformInfoHob);\r
  LowMemorySize = PlatformInfoHob.LowMemory;\r
  ASSERT (LowMemorySize != 0);\r
  LowMemoryStart = FixedPcdGet32 (PcdOvmfDxeMemFvBase) + FixedPcdGet32 (PcdOvmfDxeMemFvSize);\r
  LowMemorySize -= LowMemoryStart;\r
\r
  DEBUG ((DEBUG_INFO, "LowMemory Start and End: %x, %x\n", LowMemoryStart, LowMemoryStart + LowMemorySize));\r
  HobList = HobConstructor (\r
              (VOID *)(UINTN)LowMemoryStart,\r
              LowMemorySize,\r
              (VOID *)(UINTN)LowMemoryStart,\r
              (VOID *)(UINTN)(LowMemoryStart + LowMemorySize)\r
              );\r
\r
  SetHobList ((VOID *)(UINT64)HobList);\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
 * This function is to find a memory region which is the largest one below 4GB.\r
 * It will be used as the firmware hoblist.\r
 *\r
 * @param VmmHobList    Vmm passed hoblist which constains the memory information.\r
 * @return EFI_SUCCESS  Successfully construct the firmware hoblist.\r
 */\r
EFI_STATUS\r
EFIAPI\r
ConstructFwHobList (\r
  IN CONST VOID  *VmmHobList\r
  )\r
{\r
  EFI_PEI_HOB_POINTERS  Hob;\r
  EFI_PHYSICAL_ADDRESS  PhysicalEnd;\r
  UINT64                ResourceLength;\r
  EFI_PHYSICAL_ADDRESS  LowMemoryStart;\r
  UINT64                LowMemoryLength;\r
\r
  ASSERT (VmmHobList != NULL);\r
\r
  Hob.Raw = (UINT8 *)VmmHobList;\r
\r
  LowMemoryLength = 0;\r
  LowMemoryStart  = 0;\r
\r
  //\r
  // Parse the HOB list until end of list or matching type is found.\r
  //\r
  while (!END_OF_HOB_LIST (Hob)) {\r
    if (Hob.Header->HobType == EFI_HOB_TYPE_RESOURCE_DESCRIPTOR) {\r
      if (Hob.ResourceDescriptor->ResourceType == BZ3937_EFI_RESOURCE_MEMORY_UNACCEPTED) {\r
        PhysicalEnd    = Hob.ResourceDescriptor->PhysicalStart + Hob.ResourceDescriptor->ResourceLength;\r
        ResourceLength = Hob.ResourceDescriptor->ResourceLength;\r
\r
        if (PhysicalEnd <= BASE_4GB) {\r
          if (ResourceLength > LowMemoryLength) {\r
            LowMemoryStart  = Hob.ResourceDescriptor->PhysicalStart;\r
            LowMemoryLength = ResourceLength;\r
          }\r
        } else {\r
          break;\r
        }\r
      }\r
    }\r
\r
    Hob.Raw = GET_NEXT_HOB (Hob);\r
  }\r
\r
  if (LowMemoryLength == 0) {\r
    DEBUG ((DEBUG_ERROR, "Cannot find a memory region under 4GB for Fw hoblist.\n"));\r
    return EFI_NOT_FOUND;\r
  }\r
\r
  //\r
  // HobLib doesn't like HobStart at address 0 so adjust is needed\r
  //\r
  if (LowMemoryStart == 0) {\r
    LowMemoryStart  += EFI_PAGE_SIZE;\r
    LowMemoryLength -= EFI_PAGE_SIZE;\r
  }\r
\r
  DEBUG ((DEBUG_INFO, "LowMemory Start and End: %x, %x\n", LowMemoryStart, LowMemoryStart + LowMemoryLength));\r
  HobConstructor (\r
    (VOID *)LowMemoryStart,\r
    LowMemoryLength,\r
    (VOID *)LowMemoryStart,\r
    (VOID *)(LowMemoryStart + LowMemoryLength)\r
    );\r
\r
  SetHobList ((VOID *)(UINT64)LowMemoryStart);\r
\r
  return EFI_SUCCESS;\r
}\r