MdeModulePkg/Bds: Support booting from remote file system.

[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
  This program and the accompanying materials are licensed and made available\r
  under the terms and conditions of the BSD License which accompanies this\r
  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, WITHOUT\r
  WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
**/\r
\r
#include <Protocol/PciEnumerationComplete.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
OnPciEnumerated (\r
  IN EFI_EVENT Event,\r
  IN VOID      *Context\r
  )\r
{\r
  EFI_STATUS Status;\r
\r
  DEBUG ((EFI_D_INFO, "%a: PCI enumeration complete, 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
  VOID       *Interface;\r
  EFI_EVENT  PciEnumerated;\r
  VOID       *Registration;\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
  // Similarly, if PCI enumeration has already completed, install the tables\r
  // immediately.\r
  //\r
  Status = gBS->LocateProtocol (&gEfiPciEnumerationCompleteProtocolGuid,\r
                  NULL /* Registration */, &Interface);\r
  if (!EFI_ERROR (Status)) {\r
    DEBUG ((EFI_D_INFO, "%a: PCI enumeration already complete, "\r
      "installing ACPI tables\n", __FUNCTION__));\r
    return InstallAcpiTables (FindAcpiTableProtocol ());\r
  }\r
  ASSERT (Status == EFI_NOT_FOUND);\r
\r
  //\r
  // Otherwise, delay installing the ACPI tables until PCI enumeration\r
  // completes. The entry point's return status will only reflect the callback\r
  // setup.\r
  //\r
  Status = gBS->CreateEvent (EVT_NOTIFY_SIGNAL, TPL_CALLBACK, OnPciEnumerated,\r
                  NULL /* Context */, &PciEnumerated);\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  Status = gBS->RegisterProtocolNotify (\r
                  &gEfiPciEnumerationCompleteProtocolGuid, PciEnumerated,\r
                  &Registration);\r
  if (EFI_ERROR (Status)) {\r
    gBS->CloseEvent (PciEnumerated);\r
  } else {\r
    DEBUG ((EFI_D_INFO, "%a: PCI enumeration pending, registered callback\n",\r
      __FUNCTION__));\r
  }\r
\r
  return Status;\r
}\r