EmulatorPkg: Save the modified order after rebooting

[mirror_edk2.git] / OvmfPkg / AcpiPlatformDxe / EntryPoint.c

/** @file\r
  Entry point of OVMF ACPI Platform Driver\r
\r
  Copyright (C) 2015, Red Hat, Inc.\r
  Copyright (c) 2008 - 2015, Intel Corporation. All rights reserved.<BR>\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
**/\r
\r
#include <Guid/RootBridgesConnectedEventGroup.h>\r
#include "AcpiPlatform.h"\r
\r
STATIC\r
EFI_ACPI_TABLE_PROTOCOL *\r
FindAcpiTableProtocol (\r
  VOID\r
  )\r
{\r
  EFI_STATUS              Status;\r
  EFI_ACPI_TABLE_PROTOCOL *AcpiTable;\r
\r
  Status = gBS->LocateProtocol (\r
                  &gEfiAcpiTableProtocolGuid,\r
                  NULL,\r
                  (VOID**)&AcpiTable\r
                  );\r
  ASSERT_EFI_ERROR (Status);\r
  return AcpiTable;\r
}\r
\r
\r
STATIC\r
VOID\r
EFIAPI\r
OnRootBridgesConnected (\r
  IN EFI_EVENT Event,\r
  IN VOID      *Context\r
  )\r
{\r
  EFI_STATUS Status;\r
\r
  DEBUG ((EFI_D_INFO,\r
    "%a: root bridges have been connected, installing ACPI tables\n",\r
    __FUNCTION__));\r
  Status = InstallAcpiTables (FindAcpiTableProtocol ());\r
  if (EFI_ERROR (Status)) {\r
    DEBUG ((EFI_D_ERROR, "%a: InstallAcpiTables: %r\n", __FUNCTION__, Status));\r
  }\r
  gBS->CloseEvent (Event);\r
}\r
\r
\r
EFI_STATUS\r
EFIAPI\r
AcpiPlatformEntryPoint (\r
  IN EFI_HANDLE         ImageHandle,\r
  IN EFI_SYSTEM_TABLE   *SystemTable\r
  )\r
{\r
  EFI_STATUS Status;\r
  EFI_EVENT  RootBridgesConnected;\r
\r
  //\r
  // If the platform doesn't support PCI, or PCI enumeration has been disabled,\r
  // install the tables at once, and let the entry point's return code reflect\r
  // the full functionality.\r
  //\r
  if (PcdGetBool (PcdPciDisableBusEnumeration)) {\r
    DEBUG ((EFI_D_INFO, "%a: PCI or its enumeration disabled, installing "\r
      "ACPI tables\n", __FUNCTION__));\r
    return InstallAcpiTables (FindAcpiTableProtocol ());\r
  }\r
\r
  //\r
  // Otherwise, delay installing the ACPI tables until root bridges are\r
  // connected. The entry point's return status will only reflect the callback\r
  // setup. (Note that we're a DXE_DRIVER; our entry point function is invoked\r
  // strictly before BDS is entered and can connect the root bridges.)\r
  //\r
  Status = gBS->CreateEventEx (EVT_NOTIFY_SIGNAL, TPL_CALLBACK,\r
                  OnRootBridgesConnected, NULL /* Context */,\r
                  &gRootBridgesConnectedEventGroupGuid, &RootBridgesConnected);\r
  if (!EFI_ERROR (Status)) {\r
    DEBUG ((EFI_D_INFO,\r
      "%a: waiting for root bridges to be connected, registered callback\n",\r
      __FUNCTION__));\r
  }\r
\r
  return Status;\r
}\r