[mirror_edk2.git] / OvmfPkg / AcpiS3SaveDxe / AcpiS3Save.c

/** @file\r
  This is a replacement for the ACPI S3 Save protocol.\r
\r
  The ACPI S3 Save protocol used to be defined in the S3 boot path\r
  specification 0.9. Instead, the same functionality is now hooked to the\r
  End-of-Dxe event.\r
\r
Copyright (c) 2014-2015, Red Hat, Inc.<BR>\r
Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>\r
\r
This program and the accompanying materials\r
are licensed and made available under the terms and conditions\r
of the BSD License which accompanies this distribution.  The\r
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
**/\r
\r
#include <PiDxe.h>\r
#include <Library/BaseLib.h>\r
#include <Library/BaseMemoryLib.h>\r
#include <Library/UefiBootServicesTableLib.h>\r
#include <Library/UefiRuntimeServicesTableLib.h>\r
#include <Library/HobLib.h>\r
#include <Library/LockBoxLib.h>\r
#include <Library/PcdLib.h>\r
#include <Library/DebugLib.h>\r
#include <Library/QemuFwCfgLib.h>\r
#include <Guid/AcpiVariableCompatibility.h>\r
#include <Guid/AcpiS3Context.h>\r
#include <Guid/Acpi.h>\r
#include <Guid/EventGroup.h>\r
#include <Protocol/LockBox.h>\r
#include <IndustryStandard/Acpi.h>\r
\r
EFI_GUID              mAcpiS3IdtrProfileGuid = {\r
  0xdea652b0, 0xd587, 0x4c54, { 0xb5, 0xb4, 0xc6, 0x82, 0xe7, 0xa0, 0xaa, 0x3d }\r
};\r
\r
/**\r
  Allocate memory below 4G memory address.\r
\r
  This function allocates memory below 4G memory address.\r
\r
  @param  MemoryType   Memory type of memory to allocate.\r
  @param  Size         Size of memory to allocate.\r
  \r
  @return Allocated address for output.\r
\r
**/\r
VOID*\r
AllocateMemoryBelow4G (\r
  IN EFI_MEMORY_TYPE    MemoryType,\r
  IN UINTN              Size\r
  )\r
{\r
  UINTN                 Pages;\r
  EFI_PHYSICAL_ADDRESS  Address;\r
  EFI_STATUS            Status;\r
  VOID*                 Buffer;\r
\r
  Pages = EFI_SIZE_TO_PAGES (Size);\r
  Address = 0xffffffff;\r
\r
  Status  = gBS->AllocatePages (\r
                   AllocateMaxAddress,\r
                   MemoryType,\r
                   Pages,\r
                   &Address\r
                   );\r
  ASSERT_EFI_ERROR (Status);\r
\r
  Buffer = (VOID *) (UINTN) Address;\r
  ZeroMem (Buffer, Size);\r
\r
  return Buffer;\r
}\r
\r
/**\r
\r
  This function scan ACPI table in RSDT.\r
\r
  @param Rsdt      ACPI RSDT\r
  @param Signature ACPI table signature\r
\r
  @return ACPI table\r
\r
**/\r
VOID *\r
ScanTableInRSDT (\r
  IN EFI_ACPI_DESCRIPTION_HEADER    *Rsdt,\r
  IN UINT32                         Signature\r
  )\r
{\r
  UINTN                              Index;\r
  UINT32                             EntryCount;\r
  UINT32                             *EntryPtr;\r
  EFI_ACPI_DESCRIPTION_HEADER        *Table;\r
\r
  if (Rsdt == NULL) {\r
    return NULL;\r
  }\r
\r
  EntryCount = (Rsdt->Length - sizeof (EFI_ACPI_DESCRIPTION_HEADER)) / sizeof(UINT32);\r
  \r
  EntryPtr = (UINT32 *)(Rsdt + 1);\r
  for (Index = 0; Index < EntryCount; Index ++, EntryPtr ++) {\r
    Table = (EFI_ACPI_DESCRIPTION_HEADER *)((UINTN)(*EntryPtr));\r
    if (Table->Signature == Signature) {\r
      return Table;\r
    }\r
  }\r
  \r
  return NULL;\r
}\r
\r
/**\r
\r
  This function scan ACPI table in XSDT.\r
\r
  @param Xsdt      ACPI XSDT\r
  @param Signature ACPI table signature\r
\r
  @return ACPI table\r
\r
**/\r
VOID *\r
ScanTableInXSDT (\r
  IN EFI_ACPI_DESCRIPTION_HEADER    *Xsdt,\r
  IN UINT32                         Signature\r
  )\r
{\r
  UINTN                          Index;\r
  UINT32                         EntryCount;\r
  UINT64                         EntryPtr;\r
  UINTN                          BasePtr;\r
  EFI_ACPI_DESCRIPTION_HEADER    *Table;\r
\r
  if (Xsdt == NULL) {\r
    return NULL;\r
  }\r
\r
  EntryCount = (Xsdt->Length - sizeof (EFI_ACPI_DESCRIPTION_HEADER)) / sizeof(UINT64);\r
  \r
  BasePtr = (UINTN)(Xsdt + 1);\r
  for (Index = 0; Index < EntryCount; Index ++) {\r
    CopyMem (&EntryPtr, (VOID *)(BasePtr + Index * sizeof(UINT64)), sizeof(UINT64));\r
    Table = (EFI_ACPI_DESCRIPTION_HEADER *)((UINTN)(EntryPtr));\r
    if (Table->Signature == Signature) {\r
      return Table;\r
    }\r
  }\r
  \r
  return NULL;\r
}\r
\r
/**\r
  To find Facs in FADT.\r
\r
  @param Fadt   FADT table pointer\r
  \r
  @return  Facs table pointer.\r
**/\r
EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE  *\r
FindAcpiFacsFromFadt (\r
  IN EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE     *Fadt\r
  )\r
{\r
  EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE  *Facs;\r
  UINT64                                        Data64;\r
\r
  if (Fadt == NULL) {\r
    return NULL;\r
  }\r
\r
  if (Fadt->Header.Revision < EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_REVISION) {\r
    Facs = (EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *)(UINTN)Fadt->FirmwareCtrl;\r
  } else {\r
    if (Fadt->FirmwareCtrl != 0) {\r
      Facs = (EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *)(UINTN)Fadt->FirmwareCtrl;\r
    } else {\r
      CopyMem (&Data64, &Fadt->XFirmwareCtrl, sizeof(UINT64));\r
      Facs = (EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *)(UINTN)Data64;\r
    }\r
  }\r
  return Facs;\r
}\r
\r
/**\r
  To find Facs in Acpi tables.\r
 \r
  To find Firmware ACPI control strutcure in Acpi Tables since the S3 waking vector is stored \r
  in the table.\r
\r
  @param AcpiTableGuid   The guid used to find ACPI table in UEFI ConfigurationTable.\r
  \r
  @return  Facs table pointer.\r
**/\r
EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE  *\r
FindAcpiFacsTableByAcpiGuid (\r
  IN EFI_GUID  *AcpiTableGuid\r
  )\r
{\r
  EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER  *Rsdp;\r
  EFI_ACPI_DESCRIPTION_HEADER                   *Rsdt;\r
  EFI_ACPI_DESCRIPTION_HEADER                   *Xsdt;\r
  EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE     *Fadt;\r
  EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE  *Facs;\r
  UINTN                                         Index;\r
\r
  Rsdp  = NULL;\r
  //\r
  // found ACPI table RSD_PTR from system table\r
  //\r
  for (Index = 0; Index < gST->NumberOfTableEntries; Index++) {\r
    if (CompareGuid (&(gST->ConfigurationTable[Index].VendorGuid), AcpiTableGuid)) {\r
      //\r
      // A match was found.\r
      //\r
      Rsdp = gST->ConfigurationTable[Index].VendorTable;\r
      break;\r
    }\r
  }\r
\r
  if (Rsdp == NULL) {\r
    return NULL;\r
  }\r
\r
  //\r
  // Search XSDT\r
  //\r
  if (Rsdp->Revision >= EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER_REVISION) {\r
    Xsdt = (EFI_ACPI_DESCRIPTION_HEADER *)(UINTN) Rsdp->XsdtAddress;\r
    Fadt = ScanTableInXSDT (Xsdt, EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE);\r
    if (Fadt != NULL) {\r
      Facs = FindAcpiFacsFromFadt (Fadt);\r
      if (Facs != NULL) {\r
        return Facs;\r
      }\r
    }\r
  }\r
\r
  //\r
  // Search RSDT\r
  //\r
  Rsdt = (EFI_ACPI_DESCRIPTION_HEADER *)(UINTN) Rsdp->RsdtAddress;\r
  Fadt = ScanTableInRSDT (Rsdt, EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE);\r
  if (Fadt != NULL) {\r
    Facs = FindAcpiFacsFromFadt (Fadt);\r
    if (Facs != NULL) {\r
      return Facs;\r
    }\r
  }\r
\r
  return NULL;\r
}\r
\r
/**\r
  To find Facs in Acpi tables.\r
 \r
  To find Firmware ACPI control strutcure in Acpi Tables since the S3 waking vector is stored \r
  in the table.\r
  \r
  @return  Facs table pointer.\r
**/\r
EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE  *\r
FindAcpiFacsTable (\r
  VOID\r
  )\r
{\r
  EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *Facs;\r
\r
  Facs = FindAcpiFacsTableByAcpiGuid (&gEfiAcpi20TableGuid);\r
  if (Facs != NULL) {\r
    return Facs;\r
  }\r
\r
  return FindAcpiFacsTableByAcpiGuid (&gEfiAcpi10TableGuid);\r
}\r
\r
/**\r
  Allocates and fills in the Page Directory and Page Table Entries to\r
  establish a 1:1 Virtual to Physical mapping.\r
  If BootScriptExector driver will run in 64-bit mode, this function will establish the 1:1 \r
  virtual to physical mapping page table.\r
  If BootScriptExector driver will not run in 64-bit mode, this function will do nothing. \r
  \r
  @return  the 1:1 Virtual to Physical identity mapping page table base address. \r
\r
**/\r
EFI_PHYSICAL_ADDRESS\r
S3CreateIdentityMappingPageTables (\r
  VOID\r
  )\r
{  \r
  if (FeaturePcdGet (PcdDxeIplSwitchToLongMode)) {\r
    UINT32                                        RegEax;\r
    UINT32                                        RegEdx;\r
    UINT8                                         PhysicalAddressBits;\r
    UINT32                                        NumberOfPml4EntriesNeeded;\r
    UINT32                                        NumberOfPdpEntriesNeeded;\r
    EFI_PHYSICAL_ADDRESS                          S3NvsPageTableAddress;\r
    UINTN                                         TotalPageTableSize;\r
    VOID                                          *Hob;\r
    BOOLEAN                                       Page1GSupport;\r
\r
    Page1GSupport = FALSE;\r
    if (PcdGetBool(PcdUse1GPageTable)) {\r
      AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);\r
      if (RegEax >= 0x80000001) {\r
        AsmCpuid (0x80000001, NULL, NULL, NULL, &RegEdx);\r
        if ((RegEdx & BIT26) != 0) {\r
          Page1GSupport = TRUE;\r
        }\r
      }\r
    }\r
\r
    //\r
    // Get physical address bits supported.\r
    //\r
    Hob = GetFirstHob (EFI_HOB_TYPE_CPU);\r
    if (Hob != NULL) {\r
      PhysicalAddressBits = ((EFI_HOB_CPU *) Hob)->SizeOfMemorySpace;\r
    } else {\r
      AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);\r
      if (RegEax >= 0x80000008) {\r
        AsmCpuid (0x80000008, &RegEax, NULL, NULL, NULL);\r
        PhysicalAddressBits = (UINT8) RegEax;\r
      } else {\r
        PhysicalAddressBits = 36;\r
      }\r
    }\r
    \r
    //\r
    // IA-32e paging translates 48-bit linear addresses to 52-bit physical addresses.\r
    //\r
    ASSERT (PhysicalAddressBits <= 52);\r
    if (PhysicalAddressBits > 48) {\r
      PhysicalAddressBits = 48;\r
    }\r
\r
    //\r
    // Calculate the table entries needed.\r
    //\r
    if (PhysicalAddressBits <= 39 ) {\r
      NumberOfPml4EntriesNeeded = 1;\r
      NumberOfPdpEntriesNeeded = (UINT32)LShiftU64 (1, (PhysicalAddressBits - 30));\r
    } else {\r
      NumberOfPml4EntriesNeeded = (UINT32)LShiftU64 (1, (PhysicalAddressBits - 39));\r
      NumberOfPdpEntriesNeeded = 512;\r
    }\r
\r
    //\r
    // We need calculate whole page size then allocate once, because S3 restore page table does not know each page in Nvs.\r
    //\r
    if (!Page1GSupport) {\r
      TotalPageTableSize = (UINTN)(1 + NumberOfPml4EntriesNeeded + NumberOfPml4EntriesNeeded * NumberOfPdpEntriesNeeded);\r
    } else {\r
      TotalPageTableSize = (UINTN)(1 + NumberOfPml4EntriesNeeded);\r
    }\r
    DEBUG ((EFI_D_ERROR, "TotalPageTableSize - %x pages\n", TotalPageTableSize));\r
\r
    //\r
    // By architecture only one PageMapLevel4 exists - so lets allocate storage for it.\r
    //\r
    S3NvsPageTableAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)AllocateMemoryBelow4G (EfiReservedMemoryType, EFI_PAGES_TO_SIZE(TotalPageTableSize));\r
    ASSERT (S3NvsPageTableAddress != 0);\r
    return S3NvsPageTableAddress;\r
  } else {\r
    //\r
    // If DXE is running 32-bit mode, no need to establish page table.\r
    //\r
    return  (EFI_PHYSICAL_ADDRESS) 0;  \r
  }\r
}\r
\r
/**\r
  Prepares all information that is needed in the S3 resume boot path.\r
  \r
  Allocate the resources or prepare informations and save in ACPI variable set for S3 resume boot path  \r
  \r
  @retval EFI_SUCCESS           All information was saved successfully.\r
**/\r
STATIC\r
EFI_STATUS\r
EFIAPI\r
S3Ready (\r
  VOID\r
  )\r
{\r
  EFI_STATUS                                    Status;\r
  EFI_PHYSICAL_ADDRESS                          AcpiS3ContextBuffer;\r
  ACPI_S3_CONTEXT                               *AcpiS3Context;\r
  STATIC BOOLEAN                                AlreadyEntered;\r
  IA32_DESCRIPTOR                               *Idtr;\r
  IA32_IDT_GATE_DESCRIPTOR                      *IdtGate;\r
\r
  DEBUG ((EFI_D_INFO, "S3Ready!\n"));\r
\r
  ASSERT (!AlreadyEntered);\r
  if (AlreadyEntered) {\r
    return EFI_SUCCESS;\r
  }\r
  AlreadyEntered = TRUE;\r
\r
  AcpiS3Context = AllocateMemoryBelow4G (EfiReservedMemoryType, sizeof(*AcpiS3Context));\r
  ASSERT (AcpiS3Context != NULL);\r
  AcpiS3ContextBuffer = (EFI_PHYSICAL_ADDRESS)(UINTN)AcpiS3Context;\r
\r
  //\r
  // Get ACPI Table because we will save its position to variable\r
  //\r
  AcpiS3Context->AcpiFacsTable = (EFI_PHYSICAL_ADDRESS)(UINTN)FindAcpiFacsTable ();\r
  ASSERT (AcpiS3Context->AcpiFacsTable != 0);\r
\r
  IdtGate = AllocateMemoryBelow4G (EfiReservedMemoryType, sizeof(IA32_IDT_GATE_DESCRIPTOR) * 0x100 + sizeof(IA32_DESCRIPTOR));\r
  Idtr = (IA32_DESCRIPTOR *)(IdtGate + 0x100);\r
  Idtr->Base  = (UINTN)IdtGate;\r
  Idtr->Limit = (UINT16)(sizeof(IA32_IDT_GATE_DESCRIPTOR) * 0x100 - 1);\r
  AcpiS3Context->IdtrProfile = (EFI_PHYSICAL_ADDRESS)(UINTN)Idtr;\r
\r
  Status = SaveLockBox (\r
             &mAcpiS3IdtrProfileGuid,\r
             (VOID *)(UINTN)Idtr,\r
             (UINTN)sizeof(IA32_DESCRIPTOR)\r
             );\r
  ASSERT_EFI_ERROR (Status);\r
\r
  Status = SetLockBoxAttributes (&mAcpiS3IdtrProfileGuid, LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE);\r
  ASSERT_EFI_ERROR (Status);\r
\r
  //\r
  // Allocate page table\r
  //\r
  AcpiS3Context->S3NvsPageTableAddress = S3CreateIdentityMappingPageTables ();\r
\r
  //\r
  // Allocate stack\r
  //\r
  AcpiS3Context->BootScriptStackSize = PcdGet32 (PcdS3BootScriptStackSize);\r
  AcpiS3Context->BootScriptStackBase = (EFI_PHYSICAL_ADDRESS)(UINTN)AllocateMemoryBelow4G (EfiReservedMemoryType, PcdGet32 (PcdS3BootScriptStackSize));\r
  ASSERT (AcpiS3Context->BootScriptStackBase != 0);\r
\r
  //\r
  // Allocate a code buffer < 4G for S3 debug to load external code, set invalid code instructions in it.\r
  //\r
  AcpiS3Context->S3DebugBufferAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)AllocateMemoryBelow4G (EfiReservedMemoryType, EFI_PAGE_SIZE);\r
  SetMem ((VOID *)(UINTN)AcpiS3Context->S3DebugBufferAddress, EFI_PAGE_SIZE, 0xff);\r
\r
  DEBUG((EFI_D_INFO, "AcpiS3Context: AcpiFacsTable is 0x%8x\n", AcpiS3Context->AcpiFacsTable));\r
  DEBUG((EFI_D_INFO, "AcpiS3Context: IdtrProfile is 0x%8x\n", AcpiS3Context->IdtrProfile));\r
  DEBUG((EFI_D_INFO, "AcpiS3Context: S3NvsPageTableAddress is 0x%8x\n", AcpiS3Context->S3NvsPageTableAddress));\r
  DEBUG((EFI_D_INFO, "AcpiS3Context: S3DebugBufferAddress is 0x%8x\n", AcpiS3Context->S3DebugBufferAddress));\r
\r
  Status = SaveLockBox (\r
             &gEfiAcpiVariableGuid,\r
             &AcpiS3ContextBuffer,\r
             sizeof(AcpiS3ContextBuffer)\r
             );\r
  ASSERT_EFI_ERROR (Status);\r
\r
  Status = SaveLockBox (\r
             &gEfiAcpiS3ContextGuid,\r
             (VOID *)(UINTN)AcpiS3Context,\r
             (UINTN)sizeof(*AcpiS3Context)\r
             );\r
  ASSERT_EFI_ERROR (Status);\r
\r
  Status = SetLockBoxAttributes (&gEfiAcpiS3ContextGuid, LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE);\r
  ASSERT_EFI_ERROR (Status);\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  Callback function executed when the EndOfDxe event group is signaled.\r
\r
  @param[in] Event    Event whose notification function is being invoked.\r
  @param[in] Context  The pointer to the notification function's context, which\r
                      is implementation-dependent.\r
**/\r
VOID\r
EFIAPI\r
OnEndOfDxe (\r
  IN EFI_EVENT Event,\r
  IN VOID      *Context\r
  )\r
{\r
  EFI_STATUS Status;\r
\r
  //\r
  // Our S3Ready() function always succeeds.\r
  //\r
  Status = S3Ready ();\r
  ASSERT_EFI_ERROR (Status);\r
\r
  //\r
  // Close the event, deregistering the callback and freeing resources.\r
  //\r
  Status = gBS->CloseEvent (Event);\r
  ASSERT_EFI_ERROR (Status);\r
}\r
\r
\r
/**\r
  The Driver Entry Point.\r
  \r
  The function is the driver Entry point that will register the End-of-Dxe\r
  callback.\r
\r
  @param ImageHandle   A handle for the image that is initializing this driver\r
  @param SystemTable   A pointer to the EFI system table\r
\r
  @retval EFI_SUCCESS:              Driver initialized successfully\r
  @retval EFI_LOAD_ERROR:           Failed to Initialize or has been loaded\r
  @retval EFI_OUT_OF_RESOURCES      Could not allocate needed resources\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
InstallEndOfDxeCallback (\r
  IN EFI_HANDLE           ImageHandle,\r
  IN EFI_SYSTEM_TABLE     *SystemTable\r
  )\r
{\r
  EFI_STATUS        Status;\r
  EFI_EVENT         EndOfDxeEvent;\r
\r
  if (!QemuFwCfgS3Enabled()) {\r
    return EFI_LOAD_ERROR;\r
  }\r
\r
  Status = gBS->InstallMultipleProtocolInterfaces (\r
                  &ImageHandle,\r
                  &gEfiLockBoxProtocolGuid, NULL,\r
                  NULL\r
                  );\r
  ASSERT_EFI_ERROR (Status);\r
\r
  Status = gBS->CreateEventEx (\r
                  EVT_NOTIFY_SIGNAL,\r
                  TPL_CALLBACK,\r
                  OnEndOfDxe,\r
                  NULL, /* NotifyContext */\r
                  &gEfiEndOfDxeEventGroupGuid,\r
                  &EndOfDxeEvent\r
                  );\r
  ASSERT_EFI_ERROR (Status);\r
  return Status;\r
}\r
Commit	Line	Data
600c74bc	1	/** @file\r
ca82d563 LE	2	This is a replacement for the ACPI S3 Save protocol.\r
	3	\r
	4	The ACPI S3 Save protocol used to be defined in the S3 boot path\r
	5	specification 0.9. Instead, the same functionality is now hooked to the\r
	6	End-of-Dxe event.\r
600c74bc	7	\r
421957fb	8	Copyright (c) 2014-2015, Red Hat, Inc.<BR>\r
600c74bc LE	9	Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>\r
	10	\r
	11	This program and the accompanying materials\r
	12	are licensed and made available under the terms and conditions\r
	13	of the BSD License which accompanies this distribution. The\r
	14	full text of the license may be found at\r
	15	http://opensource.org/licenses/bsd-license.php\r
	16	\r
	17	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	18	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	19	\r
	20	**/\r
	21	\r
	22	#include <PiDxe.h>\r
	23	#include <Library/BaseLib.h>\r
	24	#include <Library/BaseMemoryLib.h>\r
	25	#include <Library/UefiBootServicesTableLib.h>\r
	26	#include <Library/UefiRuntimeServicesTableLib.h>\r
	27	#include <Library/HobLib.h>\r
	28	#include <Library/LockBoxLib.h>\r
	29	#include <Library/PcdLib.h>\r
	30	#include <Library/DebugLib.h>\r
209c3922	31	#include <Library/QemuFwCfgLib.h>\r
600c74bc LE	32	#include <Guid/AcpiVariableCompatibility.h>\r
	33	#include <Guid/AcpiS3Context.h>\r
	34	#include <Guid/Acpi.h>\r
b88ac532	35	#include <Guid/EventGroup.h>\r
d4ba06df	36	#include <Protocol/LockBox.h>\r
600c74bc LE	37	#include <IndustryStandard/Acpi.h>\r
600c74bc LE	38	\r
600c74bc LE	39	EFI_GUID mAcpiS3IdtrProfileGuid = {\r
	40	0xdea652b0, 0xd587, 0x4c54, { 0xb5, 0xb4, 0xc6, 0x82, 0xe7, 0xa0, 0xaa, 0x3d }\r
	41	};\r
	42	\r
	43	/**\r
	44	Allocate memory below 4G memory address.\r
	45	\r
	46	This function allocates memory below 4G memory address.\r
	47	\r
	48	@param MemoryType Memory type of memory to allocate.\r
	49	@param Size Size of memory to allocate.\r
	50	\r
	51	@return Allocated address for output.\r
	52	\r
	53	**/\r
	54	VOID*\r
	55	AllocateMemoryBelow4G (\r
	56	IN EFI_MEMORY_TYPE MemoryType,\r
	57	IN UINTN Size\r
	58	)\r
	59	{\r
	60	UINTN Pages;\r
	61	EFI_PHYSICAL_ADDRESS Address;\r
	62	EFI_STATUS Status;\r
	63	VOID* Buffer;\r
	64	\r
	65	Pages = EFI_SIZE_TO_PAGES (Size);\r
	66	Address = 0xffffffff;\r
	67	\r
	68	Status = gBS->AllocatePages (\r
	69	AllocateMaxAddress,\r
	70	MemoryType,\r
	71	Pages,\r
	72	&Address\r
	73	);\r
	74	ASSERT_EFI_ERROR (Status);\r
	75	\r
	76	Buffer = (VOID *) (UINTN) Address;\r
	77	ZeroMem (Buffer, Size);\r
	78	\r
	79	return Buffer;\r
	80	}\r
	81	\r
	82	/**\r
	83	\r
	84	This function scan ACPI table in RSDT.\r
	85	\r
	86	@param Rsdt ACPI RSDT\r
	87	@param Signature ACPI table signature\r
	88	\r
	89	@return ACPI table\r
	90	\r
	91	**/\r
	92	VOID *\r
	93	ScanTableInRSDT (\r
	94	IN EFI_ACPI_DESCRIPTION_HEADER *Rsdt,\r
	95	IN UINT32 Signature\r
	96	)\r
	97	{\r
	98	UINTN Index;\r
	99	UINT32 EntryCount;\r
	100	UINT32 *EntryPtr;\r
	101	EFI_ACPI_DESCRIPTION_HEADER *Table;\r
	102	\r
103	if (Rsdt == NULL) {\r
104	return NULL;\r
105	}\r
106	\r
107	EntryCount = (Rsdt->Length - sizeof (EFI_ACPI_DESCRIPTION_HEADER)) / sizeof(UINT32);\r
108	\r
109	EntryPtr = (UINT32 *)(Rsdt + 1);\r
110	for (Index = 0; Index < EntryCount; Index ++, EntryPtr ++) {\r
111	Table = (EFI_ACPI_DESCRIPTION_HEADER )((UINTN)(EntryPtr));\r
112	if (Table->Signature == Signature) {\r
113	return Table;\r
114	}\r
115	}\r
116	\r
117	return NULL;\r
118	}\r
119	\r
120	/**\r
121	\r
122	This function scan ACPI table in XSDT.\r
123	\r
124	@param Xsdt ACPI XSDT\r
125	@param Signature ACPI table signature\r
126	\r
127	@return ACPI table\r
128	\r
129	**/\r
130	VOID *\r
131	ScanTableInXSDT (\r
132	IN EFI_ACPI_DESCRIPTION_HEADER *Xsdt,\r
133	IN UINT32 Signature\r
134	)\r
135	{\r
136	UINTN Index;\r
137	UINT32 EntryCount;\r
138	UINT64 EntryPtr;\r
139	UINTN BasePtr;\r
140	EFI_ACPI_DESCRIPTION_HEADER *Table;\r
141	\r
142	if (Xsdt == NULL) {\r
143	return NULL;\r
144	}\r
145	\r
146	EntryCount = (Xsdt->Length - sizeof (EFI_ACPI_DESCRIPTION_HEADER)) / sizeof(UINT64);\r
147	\r
148	BasePtr = (UINTN)(Xsdt + 1);\r
149	for (Index = 0; Index < EntryCount; Index ++) {\r
150	CopyMem (&EntryPtr, (VOID )(BasePtr + Index sizeof(UINT64)), sizeof(UINT64));\r
151	Table = (EFI_ACPI_DESCRIPTION_HEADER *)((UINTN)(EntryPtr));\r
152	if (Table->Signature == Signature) {\r
153	return Table;\r
154	}\r
155	}\r
156	\r
157	return NULL;\r
158	}\r
159	\r
160	/**\r
161	To find Facs in FADT.\r
162	\r
163	@param Fadt FADT table pointer\r
164	\r
165	@return Facs table pointer.\r
166	**/\r
167	EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *\r
168	FindAcpiFacsFromFadt (\r
169	IN EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *Fadt\r
170	)\r
171	{\r
172	EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *Facs;\r
173	UINT64 Data64;\r
174	\r
175	if (Fadt == NULL) {\r
176	return NULL;\r
177	}\r
178	\r
179	if (Fadt->Header.Revision < EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_REVISION) {\r
180	Facs = (EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *)(UINTN)Fadt->FirmwareCtrl;\r
181	} else {\r
182	if (Fadt->FirmwareCtrl != 0) {\r
183	Facs = (EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *)(UINTN)Fadt->FirmwareCtrl;\r
184	} else {\r
185	CopyMem (&Data64, &Fadt->XFirmwareCtrl, sizeof(UINT64));\r
186	Facs = (EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *)(UINTN)Data64;\r
187	}\r
188	}\r
189	return Facs;\r
190	}\r
191	\r
192	/**\r
193	To find Facs in Acpi tables.\r
194	\r
195	To find Firmware ACPI control strutcure in Acpi Tables since the S3 waking vector is stored \r
196	in the table.\r
197	\r
198	@param AcpiTableGuid The guid used to find ACPI table in UEFI ConfigurationTable.\r
199	\r
200	@return Facs table pointer.\r
201	**/\r
202	EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *\r
203	FindAcpiFacsTableByAcpiGuid (\r
204	IN EFI_GUID *AcpiTableGuid\r
205	)\r
206	{\r
207	EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER *Rsdp;\r
208	EFI_ACPI_DESCRIPTION_HEADER *Rsdt;\r
209	EFI_ACPI_DESCRIPTION_HEADER *Xsdt;\r
210	EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE *Fadt;\r
211	EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *Facs;\r
212	UINTN Index;\r
213	\r
214	Rsdp = NULL;\r
215	//\r
216	// found ACPI table RSD_PTR from system table\r
217	//\r
218	for (Index = 0; Index < gST->NumberOfTableEntries; Index++) {\r
219	if (CompareGuid (&(gST->ConfigurationTable[Index].VendorGuid), AcpiTableGuid)) {\r
220	//\r
221	// A match was found.\r
222	//\r
223	Rsdp = gST->ConfigurationTable[Index].VendorTable;\r
224	break;\r
225	}\r
226	}\r
227	\r
228	if (Rsdp == NULL) {\r
229	return NULL;\r
230	}\r
231	\r
232	//\r
233	// Search XSDT\r
234	//\r
235	if (Rsdp->Revision >= EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER_REVISION) {\r
236	Xsdt = (EFI_ACPI_DESCRIPTION_HEADER *)(UINTN) Rsdp->XsdtAddress;\r
237	Fadt = ScanTableInXSDT (Xsdt, EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE);\r
238	if (Fadt != NULL) {\r
239	Facs = FindAcpiFacsFromFadt (Fadt);\r
240	if (Facs != NULL) {\r
241	return Facs;\r
242	}\r
243	}\r
244	}\r
245	\r
246	//\r
247	// Search RSDT\r
248	//\r
249	Rsdt = (EFI_ACPI_DESCRIPTION_HEADER *)(UINTN) Rsdp->RsdtAddress;\r
250	Fadt = ScanTableInRSDT (Rsdt, EFI_ACPI_2_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE);\r
251	if (Fadt != NULL) {\r
252	Facs = FindAcpiFacsFromFadt (Fadt);\r
253	if (Facs != NULL) {\r
254	return Facs;\r
255	}\r
256	}\r
257	\r
258	return NULL;\r
259	}\r
260	\r
261	/**\r
262	To find Facs in Acpi tables.\r
263	\r
264	To find Firmware ACPI control strutcure in Acpi Tables since the S3 waking vector is stored \r
265	in the table.\r
266	\r
267	@return Facs table pointer.\r
268	**/\r
269	EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *\r
270	FindAcpiFacsTable (\r
271	VOID\r
272	)\r
273	{\r
274	EFI_ACPI_2_0_FIRMWARE_ACPI_CONTROL_STRUCTURE *Facs;\r
275	\r
276	Facs = FindAcpiFacsTableByAcpiGuid (&gEfiAcpi20TableGuid);\r
277	if (Facs != NULL) {\r
278	return Facs;\r
279	}\r
280	\r
281	return FindAcpiFacsTableByAcpiGuid (&gEfiAcpi10TableGuid);\r
282	}\r
283	\r
284	/**\r
285	Allocates and fills in the Page Directory and Page Table Entries to\r
286	establish a 1:1 Virtual to Physical mapping.\r
287	If BootScriptExector driver will run in 64-bit mode, this function will establish the 1:1 \r
288	virtual to physical mapping page table.\r
289	If BootScriptExector driver will not run in 64-bit mode, this function will do nothing. \r
290	\r
291	@return the 1:1 Virtual to Physical identity mapping page table base address. \r
292	\r
293	**/\r
294	EFI_PHYSICAL_ADDRESS\r
295	S3CreateIdentityMappingPageTables (\r
296	VOID\r
297	)\r
298	{ \r
299	if (FeaturePcdGet (PcdDxeIplSwitchToLongMode)) {\r
300	UINT32 RegEax;\r
301	UINT32 RegEdx;\r
302	UINT8 PhysicalAddressBits;\r
303	UINT32 NumberOfPml4EntriesNeeded;\r
304	UINT32 NumberOfPdpEntriesNeeded;\r
305	EFI_PHYSICAL_ADDRESS S3NvsPageTableAddress;\r
306	UINTN TotalPageTableSize;\r
307	VOID *Hob;\r
308	BOOLEAN Page1GSupport;\r
309	\r
310	Page1GSupport = FALSE;\r
311	if (PcdGetBool(PcdUse1GPageTable)) {\r
312	AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);\r
313	if (RegEax >= 0x80000001) {\r
314	AsmCpuid (0x80000001, NULL, NULL, NULL, &RegEdx);\r
315	if ((RegEdx & BIT26) != 0) {\r
316	Page1GSupport = TRUE;\r
317	}\r
318	}\r
319	}\r
320	\r
321	//\r
322	// Get physical address bits supported.\r
323	//\r
324	Hob = GetFirstHob (EFI_HOB_TYPE_CPU);\r
325	if (Hob != NULL) {\r
326	PhysicalAddressBits = ((EFI_HOB_CPU *) Hob)->SizeOfMemorySpace;\r
327	} else {\r
328	AsmCpuid (0x80000000, &RegEax, NULL, NULL, NULL);\r
329	if (RegEax >= 0x80000008) {\r
330	AsmCpuid (0x80000008, &RegEax, NULL, NULL, NULL);\r
331	PhysicalAddressBits = (UINT8) RegEax;\r
332	} else {\r
333	PhysicalAddressBits = 36;\r
334	}\r
335	}\r
336	\r
337	//\r
338	// IA-32e paging translates 48-bit linear addresses to 52-bit physical addresses.\r
339	//\r
340	ASSERT (PhysicalAddressBits <= 52);\r
341	if (PhysicalAddressBits > 48) {\r
342	PhysicalAddressBits = 48;\r
343	}\r
344	\r
345	//\r
346	// Calculate the table entries needed.\r
347	//\r
348	if (PhysicalAddressBits <= 39 ) {\r
349	NumberOfPml4EntriesNeeded = 1;\r
350	NumberOfPdpEntriesNeeded = (UINT32)LShiftU64 (1, (PhysicalAddressBits - 30));\r
351	} else {\r
352	NumberOfPml4EntriesNeeded = (UINT32)LShiftU64 (1, (PhysicalAddressBits - 39));\r
353	NumberOfPdpEntriesNeeded = 512;\r
354	}\r
355	\r
356	//\r
357	// We need calculate whole page size then allocate once, because S3 restore page table does not know each page in Nvs.\r
358	//\r
359	if (!Page1GSupport) {\r
360	TotalPageTableSize = (UINTN)(1 + NumberOfPml4EntriesNeeded + NumberOfPml4EntriesNeeded * NumberOfPdpEntriesNeeded);\r
361	} else {\r
362	TotalPageTableSize = (UINTN)(1 + NumberOfPml4EntriesNeeded);\r
363	}\r
364	DEBUG ((EFI_D_ERROR, "TotalPageTableSize - %x pages\n", TotalPageTableSize));\r
365	\r
366	//\r
367	// By architecture only one PageMapLevel4 exists - so lets allocate storage for it.\r
368	//\r
369	S3NvsPageTableAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)AllocateMemoryBelow4G (EfiReservedMemoryType, EFI_PAGES_TO_SIZE(TotalPageTableSize));\r
370	ASSERT (S3NvsPageTableAddress != 0);\r
371	return S3NvsPageTableAddress;\r
372	} else {\r
373	//\r
374	// If DXE is running 32-bit mode, no need to establish page table.\r
375	//\r
376	return (EFI_PHYSICAL_ADDRESS) 0; \r
377	}\r
378	}\r
379	\r
600c74bc LE	380	/**\r
	381	Prepares all information that is needed in the S3 resume boot path.\r
	382	\r
	383	Allocate the resources or prepare informations and save in ACPI variable set for S3 resume boot path \r
	384	\r
600c74bc	385	@retval EFI_SUCCESS All information was saved successfully.\r
600c74bc	386	**/\r
ca82d563	387	STATIC\r
600c74bc LE	388	EFI_STATUS\r
	389	EFIAPI\r
	390	S3Ready (\r
ca82d563	391	VOID\r
600c74bc LE	392	)\r
	393	{\r
	394	EFI_STATUS Status;\r
	395	EFI_PHYSICAL_ADDRESS AcpiS3ContextBuffer;\r
	396	ACPI_S3_CONTEXT *AcpiS3Context;\r
	397	STATIC BOOLEAN AlreadyEntered;\r
	398	IA32_DESCRIPTOR *Idtr;\r
	399	IA32_IDT_GATE_DESCRIPTOR *IdtGate;\r
	400	\r
	401	DEBUG ((EFI_D_INFO, "S3Ready!\n"));\r
	402	\r
ca82d563	403	ASSERT (!AlreadyEntered);\r
600c74bc LE	404	if (AlreadyEntered) {\r
	405	return EFI_SUCCESS;\r
	406	}\r
	407	AlreadyEntered = TRUE;\r
	408	\r
	409	AcpiS3Context = AllocateMemoryBelow4G (EfiReservedMemoryType, sizeof(*AcpiS3Context));\r
	410	ASSERT (AcpiS3Context != NULL);\r
	411	AcpiS3ContextBuffer = (EFI_PHYSICAL_ADDRESS)(UINTN)AcpiS3Context;\r
	412	\r
	413	//\r
	414	// Get ACPI Table because we will save its position to variable\r
	415	//\r
	416	AcpiS3Context->AcpiFacsTable = (EFI_PHYSICAL_ADDRESS)(UINTN)FindAcpiFacsTable ();\r
	417	ASSERT (AcpiS3Context->AcpiFacsTable != 0);\r
	418	\r
	419	IdtGate = AllocateMemoryBelow4G (EfiReservedMemoryType, sizeof(IA32_IDT_GATE_DESCRIPTOR) * 0x100 + sizeof(IA32_DESCRIPTOR));\r
	420	Idtr = (IA32_DESCRIPTOR *)(IdtGate + 0x100);\r
	421	Idtr->Base = (UINTN)IdtGate;\r
	422	Idtr->Limit = (UINT16)(sizeof(IA32_IDT_GATE_DESCRIPTOR) * 0x100 - 1);\r
	423	AcpiS3Context->IdtrProfile = (EFI_PHYSICAL_ADDRESS)(UINTN)Idtr;\r
	424	\r
	425	Status = SaveLockBox (\r
	426	&mAcpiS3IdtrProfileGuid,\r
	427	(VOID *)(UINTN)Idtr,\r
	428	(UINTN)sizeof(IA32_DESCRIPTOR)\r
	429	);\r
	430	ASSERT_EFI_ERROR (Status);\r
	431	\r
	432	Status = SetLockBoxAttributes (&mAcpiS3IdtrProfileGuid, LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE);\r
	433	ASSERT_EFI_ERROR (Status);\r
	434	\r
	435	//\r
	436	// Allocate page table\r
	437	//\r
	438	AcpiS3Context->S3NvsPageTableAddress = S3CreateIdentityMappingPageTables ();\r
	439	\r
	440	//\r
	441	// Allocate stack\r
	442	//\r
	443	AcpiS3Context->BootScriptStackSize = PcdGet32 (PcdS3BootScriptStackSize);\r
	444	AcpiS3Context->BootScriptStackBase = (EFI_PHYSICAL_ADDRESS)(UINTN)AllocateMemoryBelow4G (EfiReservedMemoryType, PcdGet32 (PcdS3BootScriptStackSize));\r
	445	ASSERT (AcpiS3Context->BootScriptStackBase != 0);\r
	446	\r
	447	//\r
	448	// Allocate a code buffer < 4G for S3 debug to load external code, set invalid code instructions in it.\r
	449	//\r
	450	AcpiS3Context->S3DebugBufferAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)AllocateMemoryBelow4G (EfiReservedMemoryType, EFI_PAGE_SIZE);\r
	451	SetMem ((VOID *)(UINTN)AcpiS3Context->S3DebugBufferAddress, EFI_PAGE_SIZE, 0xff);\r
	452	\r
	453	DEBUG((EFI_D_INFO, "AcpiS3Context: AcpiFacsTable is 0x%8x\n", AcpiS3Context->AcpiFacsTable));\r
	454	DEBUG((EFI_D_INFO, "AcpiS3Context: IdtrProfile is 0x%8x\n", AcpiS3Context->IdtrProfile));\r
	455	DEBUG((EFI_D_INFO, "AcpiS3Context: S3NvsPageTableAddress is 0x%8x\n", AcpiS3Context->S3NvsPageTableAddress));\r
	456	DEBUG((EFI_D_INFO, "AcpiS3Context: S3DebugBufferAddress is 0x%8x\n", AcpiS3Context->S3DebugBufferAddress));\r
	457	\r
	458	Status = SaveLockBox (\r
	459	&gEfiAcpiVariableGuid,\r
	460	&AcpiS3ContextBuffer,\r
	461	sizeof(AcpiS3ContextBuffer)\r
	462	);\r
	463	ASSERT_EFI_ERROR (Status);\r
	464	\r
	465	Status = SaveLockBox (\r
	466	&gEfiAcpiS3ContextGuid,\r
	467	(VOID *)(UINTN)AcpiS3Context,\r
468	(UINTN)sizeof(*AcpiS3Context)\r
469	);\r
470	ASSERT_EFI_ERROR (Status);\r
471	\r
472	Status = SetLockBoxAttributes (&gEfiAcpiS3ContextGuid, LOCK_BOX_ATTRIBUTE_RESTORE_IN_PLACE);\r
473	ASSERT_EFI_ERROR (Status);\r
474	\r
475	return EFI_SUCCESS;\r
476	}\r
477	\r
b88ac532 LE	478	/**\r
	479	Callback function executed when the EndOfDxe event group is signaled.\r
	480	\r
	481	@param[in] Event Event whose notification function is being invoked.\r
	482	@param[in] Context The pointer to the notification function's context, which\r
	483	is implementation-dependent.\r
	484	**/\r
	485	VOID\r
	486	EFIAPI\r
	487	OnEndOfDxe (\r
	488	IN EFI_EVENT Event,\r
	489	IN VOID *Context\r
	490	)\r
	491	{\r
	492	EFI_STATUS Status;\r
	493	\r
	494	//\r
ca82d563	495	// Our S3Ready() function always succeeds.\r
b88ac532	496	//\r
ca82d563	497	Status = S3Ready ();\r
b88ac532 LE	498	ASSERT_EFI_ERROR (Status);\r
	499	\r
	500	//\r
	501	// Close the event, deregistering the callback and freeing resources.\r
	502	//\r
	503	Status = gBS->CloseEvent (Event);\r
	504	ASSERT_EFI_ERROR (Status);\r
	505	}\r
	506	\r
	507	\r
600c74bc LE	508	/**\r
	509	The Driver Entry Point.\r
	510	\r
ca82d563 LE	511	The function is the driver Entry point that will register the End-of-Dxe\r
	512	callback.\r
	513	\r
600c74bc LE	514	@param ImageHandle A handle for the image that is initializing this driver\r
	515	@param SystemTable A pointer to the EFI system table\r
	516	\r
	517	@retval EFI_SUCCESS: Driver initialized successfully\r
	518	@retval EFI_LOAD_ERROR: Failed to Initialize or has been loaded\r
	519	@retval EFI_OUT_OF_RESOURCES Could not allocate needed resources\r
	520	\r
	521	**/\r
	522	EFI_STATUS\r
	523	EFIAPI\r
ca82d563	524	InstallEndOfDxeCallback (\r
600c74bc LE	525	IN EFI_HANDLE ImageHandle,\r
	526	IN EFI_SYSTEM_TABLE *SystemTable\r
	527	)\r
	528	{\r
	529	EFI_STATUS Status;\r
b88ac532	530	EFI_EVENT EndOfDxeEvent;\r
600c74bc	531	\r
209c3922 LE	532	if (!QemuFwCfgS3Enabled()) {\r
	533	return EFI_LOAD_ERROR;\r
	534	}\r
	535	\r
d4ba06df	536	Status = gBS->InstallMultipleProtocolInterfaces (\r
600c74bc	537	&ImageHandle,\r
d4ba06df LE	538	&gEfiLockBoxProtocolGuid, NULL,\r
d4ba06df LE	539	NULL\r
600c74bc LE	540	);\r
600c74bc LE	541	ASSERT_EFI_ERROR (Status);\r
b88ac532 LE	542	\r
	543	Status = gBS->CreateEventEx (\r
	544	EVT_NOTIFY_SIGNAL,\r
	545	TPL_CALLBACK,\r
	546	OnEndOfDxe,\r
	547	NULL, /* NotifyContext */\r
	548	&gEfiEndOfDxeEventGroupGuid,\r
	549	&EndOfDxeEvent\r
	550	);\r
	551	ASSERT_EFI_ERROR (Status);\r
600c74bc LE	552	return Status;\r
600c74bc LE	553	}\r