2 files changed, 149 insertions, 0 deletions
diff --git a/ArmVirtPkg/Library/DebugLibFdtPL011Uart/DxeRuntimeDebugLibFdtPL011Uart.inf b/ArmVirtPkg/Library/DebugLibFdtPL011Uart/DxeRuntimeDebugLibFdtPL011Uart.inf
new file mode 100644
index 0000000000..84e9dbae22
--- /dev/null
+++ b/ArmVirtPkg/Library/DebugLibFdtPL011Uart/DxeRuntimeDebugLibFdtPL011Uart.inf
@@ -0,0 +1,61 @@
+## @file
+# DebugLib instance that produces debug output directly via PL011UartLib.
+#
+# If there are at least two PL011 UARTs in the device tree, and the /chosen
+# node's "stdout-path" property references one PL011 UART, then both raw
+# SerialPortLib IO, and -- via SerialDxe -- UEFI console IO, will occur on that
+# UART; and this DebugLib instance will produce output on a *different* UART.
+#
+# This instance is suitable for DXE_RUNTIME_DRIVER modules. When exiting boot
+# services, UART access is stopped.
+#
+# Copyright (C) Red Hat
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+[Defines]
+  INF_VERSION    = 1.27
+  BASE_NAME      = DxeRuntimeDebugLibFdtPL011Uart
+  FILE_GUID      = 8A6E0972-81B5-4FF4-BB24-A07748415947
+  MODULE_TYPE    = DXE_RUNTIME_DRIVER
+  VERSION_STRING = 1.0
+  LIBRARY_CLASS  = DebugLib|DXE_RUNTIME_DRIVER
+  CONSTRUCTOR    = DxeRuntimeDebugLibFdtPL011UartConstructor
+  DESTRUCTOR     = DxeRuntimeDebugLibFdtPL011UartDestructor
+
+[Sources]
+  DebugLib.c
+  Ram.c
+  Ram.h
+  Runtime.c
+  Write.h
+
+[Packages]
+  ArmPlatformPkg/ArmPlatformPkg.dec
+  ArmVirtPkg/ArmVirtPkg.dec
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  BaseLib
+  BaseMemoryLib
+  DebugPrintErrorLevelLib
+  HobLib                  # Ram.c
+  PL011UartLib
+  PcdLib
+  PrintLib
+
+[Pcd]
+  gEfiMdePkgTokenSpaceGuid.PcdDebugClearMemoryValue
+  gEfiMdePkgTokenSpaceGuid.PcdDebugPropertyMask
+  gEfiMdePkgTokenSpaceGuid.PcdFixedDebugPrintErrorLevel
+
+[FixedPcd]
+  gArmPlatformTokenSpaceGuid.PL011UartClkInHz
+  gEfiMdePkgTokenSpaceGuid.PcdUartDefaultBaudRate
+  gEfiMdePkgTokenSpaceGuid.PcdUartDefaultDataBits
+  gEfiMdePkgTokenSpaceGuid.PcdUartDefaultParity
+  gEfiMdePkgTokenSpaceGuid.PcdUartDefaultStopBits
+
+[Guids]
+  gEarlyPL011BaseAddressGuid # Ram.c
diff --git a/ArmVirtPkg/Library/DebugLibFdtPL011Uart/Runtime.c b/ArmVirtPkg/Library/DebugLibFdtPL011Uart/Runtime.c
new file mode 100644
index 0000000000..de7144739c
--- /dev/null
+++ b/ArmVirtPkg/Library/DebugLibFdtPL011Uart/Runtime.c
@@ -0,0 +1,88 @@
+/** @file
+  Permanently disable the library instance in DXE_RUNTIME_DRIVER modules when
+  exiting boot services.
+
+  Copyright (C) Red Hat
+  Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2018, Linaro, Ltd. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#include <Uefi/UefiSpec.h>
+
+#include "Ram.h"
+
+STATIC EFI_EVENT  mExitBootServicesEvent;
+
+/**
+  Notification function that is triggered when the boot service
+  ExitBootServices() is called.
+
+  @param[in] Event    Event whose notification function is being invoked. Here,
+                      unused.
+
+  @param[in] Context  The pointer to the notification function's context, which
+                      is implementation-dependent. Here, unused.
+**/
+STATIC
+VOID
+EFIAPI
+ExitBootServicesNotify (
+  IN EFI_EVENT  Event,
+  IN VOID       *Context
+  )
+{
+  mDebugLibFdtPL011UartAddress         = 0;
+  mDebugLibFdtPL011UartPermanentStatus = RETURN_ABORTED;
+}
+
+/**
+  Library instance constructor, registering ExitBootServicesNotify().
+
+  @param[in] ImageHandle  The firmware-allocated handle for the EFI image.
+
+  @param[in] SystemTable  A pointer to the EFI System Table.
+
+  @retval EFI_SUCCESS  The operation completed successfully.
+
+  @return              Error codes propagated from CreateEvent(); the
+                       registration of ExitBootServicesNotify() failed.
+**/
+EFI_STATUS
+EFIAPI
+DxeRuntimeDebugLibFdtPL011UartConstructor (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  return SystemTable->BootServices->CreateEvent (
+                                      EVT_SIGNAL_EXIT_BOOT_SERVICES,
+                                      TPL_CALLBACK,
+                                      ExitBootServicesNotify,
+                                      NULL /* NotifyContext */,
+                                      &mExitBootServicesEvent
+                                      );
+}
+
+/**
+  Library instance destructor, deregistering ExitBootServicesNotify().
+
+  @param[in] ImageHandle  The firmware-allocated handle for the EFI image.
+
+  @param[in] SystemTable  A pointer to the EFI System Table.
+
+  @retval EFI_SUCCESS  Library instance tear-down complete.
+
+  @return              Error codes propagated from CloseEvent(); the
+                       deregistration of ExitBootServicesNotify() failed.
+**/
+EFI_STATUS
+EFIAPI
+DxeRuntimeDebugLibFdtPL011UartDestructor (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  return SystemTable->BootServices->CloseEvent (mExitBootServicesEvent);
+}