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[mirror_edk2.git] / ArmVirtPkg / PlatformHasAcpiDtDxe / PlatformHasAcpiDtDxe.c

/** @file\r
  Decide whether the firmware should expose an ACPI- and/or a Device Tree-based\r
  hardware description to the operating system.\r
\r
  Copyright (c) 2017, Red Hat, Inc.\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
**/\r
\r
#include <Guid/PlatformHasAcpi.h>\r
#include <Guid/PlatformHasDeviceTree.h>\r
#include <Library/BaseLib.h>\r
#include <Library/DebugLib.h>\r
#include <Library/PcdLib.h>\r
#include <Library/QemuFwCfgLib.h>\r
#include <Library/UefiBootServicesTableLib.h>\r
\r
EFI_STATUS\r
EFIAPI\r
PlatformHasAcpiDt (\r
  IN EFI_HANDLE        ImageHandle,\r
  IN EFI_SYSTEM_TABLE  *SystemTable\r
  )\r
{\r
  EFI_STATUS            Status;\r
  FIRMWARE_CONFIG_ITEM  FwCfgItem;\r
  UINTN                 FwCfgSize;\r
\r
  //\r
  // If we fail to install any of the necessary protocols below, the OS will be\r
  // unbootable anyway (due to lacking hardware description), so tolerate no\r
  // errors here.\r
  //\r
  if ((MAX_UINTN == MAX_UINT64) &&\r
      !PcdGetBool (PcdForceNoAcpi) &&\r
      !EFI_ERROR (\r
         QemuFwCfgFindFile (\r
           "etc/table-loader",\r
           &FwCfgItem,\r
           &FwCfgSize\r
           )\r
         ))\r
  {\r
    //\r
    // Only make ACPI available on 64-bit systems, and only if QEMU generates\r
    // (a subset of) the ACPI tables.\r
    //\r
    Status = gBS->InstallProtocolInterface (\r
                    &ImageHandle,\r
                    &gEdkiiPlatformHasAcpiGuid,\r
                    EFI_NATIVE_INTERFACE,\r
                    NULL\r
                    );\r
    if (EFI_ERROR (Status)) {\r
      goto Failed;\r
    }\r
\r
    return Status;\r
  }\r
\r
  //\r
  // Expose the Device Tree otherwise.\r
  //\r
  Status = gBS->InstallProtocolInterface (\r
                  &ImageHandle,\r
                  &gEdkiiPlatformHasDeviceTreeGuid,\r
                  EFI_NATIVE_INTERFACE,\r
                  NULL\r
                  );\r
  if (EFI_ERROR (Status)) {\r
    goto Failed;\r
  }\r
\r
  return Status;\r
\r
Failed:\r
  ASSERT_EFI_ERROR (Status);\r
  CpuDeadLoop ();\r
  //\r
  // Keep compilers happy.\r
  //\r
  return Status;\r
}\r