ArmVirtPkg: introduce DebugLibFdtPL011Uart DXE Runtime instance

Introduce three new DebugLib instances, forked from
MdePkg/Library/BaseDebugLibSerialPort. All three instances rely on
PL011UartLib rather than SerialPortLib so that they can customize the
PL011 UART that the debug messages are written to. All three instances
direct the debug output to the first such PL011 UART that *differs* from
the one specified in the Device Tree's /chosen node's "stdout-path"
property.

From these, DxeRuntimeDebugLibFdtPL011Uart is identical to
DebugLibFdtPL011UartRam, with the addition that UART access is permanently
disabled when the containing DXE_RUNTIME_DRIVER module is notified about
exiting boot services.

The contexts in which these DebugLib instances run are identical to those
in which the corresponding SerialPortLib instances run. The particular
original dependency chain is

  DxeRuntimeDebugLibSerialPort (DXE_RUNTIME_DRIVER)
    FdtPL011SerialPortLib
      gEarlyPL011BaseAddressGuid
      HobLib
      PL011UartLib

and the new dependency chain is

  DxeRuntimeDebugLibFdtPL011Uart (DXE_RUNTIME_DRIVER)
    gEarlyPL011BaseAddressGuid
    HobLib
    PL011UartLib

The ArmVirtPkg DSC files will be switched to the new library instances in
a separate patch.

This patch is worth viewing with "git show --find-copies-harder".

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Sami Mujawar <sami.mujawar@arm.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20231008153912.175941-9-lersek@redhat.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=4577
[lersek@redhat.com: add TianoCore BZ reference]

0 files changed, 0 insertions, 0 deletions