OvmfPkg/Include/Library/QemuBootOrderLib.h

   1 /** @file
   2   Rewrite the BootOrder NvVar based on QEMU's "bootorder" fw_cfg file --
   3   include file.
   4
   5   Copyright (C) 2012-2014, Red Hat, Inc.
   6
   7   SPDX-License-Identifier: BSD-2-Clause-Patent
   8 **/
   9
  10 #ifndef __QEMU_BOOT_ORDER_LIB_H__
  11 #define __QEMU_BOOT_ORDER_LIB_H__
  12
  13 #include <Uefi/UefiBaseType.h>
  14 #include <Base.h>
  15
  16 /**
  17   Connect devices based on the boot order retrieved from QEMU.
  18
  19   Attempt to retrieve the "bootorder" fw_cfg file from QEMU. Translate the
  20   OpenFirmware device paths therein to UEFI device path fragments. Connect the
  21   devices identified by the UEFI devpath prefixes as narrowly as possible, then
  22   connect all their child devices, recursively.
  23
  24   If this function fails, then platform BDS should fall back to
  25   EfiBootManagerConnectAll(), or some other method for connecting any expected
  26   boot devices.
  27
  28   @retval RETURN_SUCCESS            The "bootorder" fw_cfg file has been
  29                                     parsed, and the referenced device-subtrees
  30                                     have been connected.
  31
  32   @retval RETURN_UNSUPPORTED        QEMU's fw_cfg is not supported.
  33
  34   @retval RETURN_NOT_FOUND          Empty or nonexistent "bootorder" fw_cfg
  35                                     file.
  36
  37   @retval RETURN_INVALID_PARAMETER  Parse error in the "bootorder" fw_cfg file.
  38
  39   @retval RETURN_OUT_OF_RESOURCES   Memory allocation failed.
  40
  41   @return                           Error statuses propagated from underlying
  42                                     functions.
  43 **/
  44 RETURN_STATUS
  45 EFIAPI
  46 ConnectDevicesFromQemu (
  47   VOID
  48   );
  49
  50 /**
  51
  52   Set the boot order based on configuration retrieved from QEMU.
  53
  54   Attempt to retrieve the "bootorder" fw_cfg file from QEMU. Translate the
  55   OpenFirmware device paths therein to UEFI device path fragments. Match the
  56   translated fragments against the current list of boot options, and rewrite
  57   the BootOrder NvVar so that it corresponds to the order described in fw_cfg.
  58
  59   Platform BDS should call this function after connecting any expected boot
  60   devices and calling EfiBootManagerRefreshAllBootOption ().
  61
  62   @retval RETURN_SUCCESS            BootOrder NvVar rewritten.
  63
  64   @retval RETURN_UNSUPPORTED        QEMU's fw_cfg is not supported.
  65
  66   @retval RETURN_NOT_FOUND          Empty or nonexistent "bootorder" fw_cfg
  67                                     file, or no match found between the
  68                                     "bootorder" fw_cfg file and BootOptionList.
  69
  70   @retval RETURN_INVALID_PARAMETER  Parse error in the "bootorder" fw_cfg file.
  71
  72   @retval RETURN_OUT_OF_RESOURCES   Memory allocation failed.
  73
  74   @return                           Values returned by gBS->LocateProtocol ()
  75                                     or gRT->SetVariable ().
  76
  77 **/
  78 RETURN_STATUS
  79 EFIAPI
  80 SetBootOrderFromQemu (
  81   VOID
  82   );
  83
  84 /**
  85   Calculate the number of seconds we should be showing the FrontPage progress
  86   bar for.
  87
  88   @return  The TimeoutDefault argument for PlatformBdsEnterFrontPage().
  89 **/
  90 UINT16
  91 EFIAPI
  92 GetFrontPageTimeoutFromQemu (
  93   VOID
  94   );
  95
  96 #endif