[PATCH 0/5] ArmPkg/PlatformBootManagerLib: play nice without ConnectAll()

["Ard Biesheuvel" <ard.biesheuvel@arm.com>]

Currently, Armpkg's PlatformBootManagerLib connects all controller to
their drivers recursively, even if the active boot option does not
require it. There are some historical reasons for this, some of which are
being addressed in separate patches.

This series addresses the way ArmPkg's PlatformBootManagerLib implementation
deals with the UEFI Shell and the UiApp: currently, the shell is always
added as an ordinary boot option, which will be started if no other boot
options can be started, or if it is the first one in the boot order.

Once we remove the ConnectAll() call from PlatformBootManagerLib, those shells
will be launched without any block or other devices connected, which may
confuse novice users. So before doing so, let's make the handling a bit more
sane:
- add a 's' hotkey that enters the UEFI shell regardless of its priority
  in the BootOrder - this shell will be entered with no devices connected
  after patch #4
- enter the UiApp as a last resort if no boot options can be started
- make the UEFI Shell boot option hidden, so it is not started by default
  (only by hotkey or BootNext)
- remove the ConnectAll() call from PlatformBootManagerLib
- finally, add a plugin library for UiApp to expose the UEFI Shell via an
  ordinary main menu option (this works around the fact that patch #3 will
  result in the UEFI Shell disappearing from the Boot Manager list).
  Entering the shell this way will resemble the old situation, given that
  UiApp connects all devices and refreshes all boot options etc at launch.

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Leif Lindholm <leif@nuviainc.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Zhichao Gao <zhichao.gao@intel.com>

Ard Biesheuvel (5):
  ArmPkg/PlatformBootManagerLib: register 's' as UEFI Shell hotkey
  ArmPkg/PlatformBootManagerLib: fall back to the UiApp on boot failure
  ArmPkg/PlatformBootManagerLib: hide UEFI Shell as a regular boot
    option
  ArmPkg/PlatformBootManagerLib: don't connect all devices on each boot
  ShellPkg: add BootManager library to add UEFI Shell menu option

 .../ShellBootManagerLib.inf                   |  45 +++
 .../ShellBootManagerLib/ShellBootManagerLib.h |  44 +++
 .../PlatformBootManagerLib/PlatformBm.c       |  37 ++-
 .../ShellBootManagerLib/ShellBootManagerLib.c | 258 ++++++++++++++++++
 .../ShellBootManagerLib/ShellBmStrings.uni    |  17 ++
 .../ShellBootManagerLib/ShellBmVfr.Vfr        |  37 +++
 6 files changed, 425 insertions(+), 13 deletions(-)
 create mode 100644 ShellPkg/Library/ShellBootManagerLib/ShellBootManagerLib.inf
 create mode 100644 ShellPkg/Library/ShellBootManagerLib/ShellBootManagerLib.h
 create mode 100644 ShellPkg/Library/ShellBootManagerLib/ShellBootManagerLib.c
 create mode 100644 ShellPkg/Library/ShellBootManagerLib/ShellBmStrings.uni
 create mode 100644 ShellPkg/Library/ShellBootManagerLib/ShellBmVfr.Vfr

-- 
2.17.1