BdsSerialPortTerminalLib add a terminal device
to the Serial UART device created by
MdeModulePkg/Universal/SerialDxe to the UEFI
Console Variables (ConIn, ConOut, ErrOut). This
allows BIOS Setup, UEFI Shell, etc. to be used
on a headless system via a null modem and
terminal emulation software.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Isaac Oram <isaac.w.oram@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Sai Chaganty <rangasai.v.chaganty@intel.com>
Cc: Benjamin Doron <benjamin.doron00@gmail.com>
Cc: Michael Kubacki <michael.kubacki@microsoft.com>
Cc: Jeremy Soller <jeremy@system76.com>
Signed-off-by: Nate DeSimone <nathaniel.l.desimone@intel.com>
---
 .../Intel/BoardModulePkg/BoardModulePkg.dsc   |   3 +-
 .../BdsSerialPortTerminalLib.c                | 114 ++++++++++++++++++
 .../BdsSerialPortTerminalLib.h                |  53 ++++++++
 .../BdsSerialPortTerminalLib.inf              |  49 ++++++++
 4 files changed, 218 insertions(+), 1 deletion(-)
 create mode 100644 Platform/Intel/BoardModulePkg/Library/BdsSerialPortTerminalLib/BdsSerialPortTerminalLib.c
 create mode 100644 Platform/Intel/BoardModulePkg/Library/BdsSerialPortTerminalLib/BdsSerialPortTerminalLib.h
 create mode 100644 Platform/Intel/BoardModulePkg/Library/BdsSerialPortTerminalLib/BdsSerialPortTerminalLib.inf

diff --git a/Platform/Intel/BoardModulePkg/BoardModulePkg.dsc b/Platform/Intel/BoardModulePkg/BoardModulePkg.dsc
index 9f00592a19..c93b536f0d 100644
--- a/Platform/Intel/BoardModulePkg/BoardModulePkg.dsc
+++ b/Platform/Intel/BoardModulePkg/BoardModulePkg.dsc
@@ -6,7 +6,7 @@
 # INF files to generate AutoGen.c and AutoGen.h files
 # for the build infrastructure.
 #
-# Copyright (c) 2019 - 2021, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2019 - 2022, Intel Corporation. All rights reserved.<BR>
 #
 # SPDX-License-Identifier: BSD-2-Clause-Patent
 #
@@ -91,3 +91,4 @@
 
   BoardModulePkg/Library/PeiFirmwareBootMediaInfoLib/PeiFirmwareBootMediaInfoLib.inf
   BoardModulePkg/Library/BdsPs2KbcLib/BdsPs2KbcLib.inf
+  BoardModulePkg/Library/BdsSerialPortTerminalLib/BdsSerialPortTerminalLib.inf
diff --git a/Platform/Intel/BoardModulePkg/Library/BdsSerialPortTerminalLib/BdsSerialPortTerminalLib.c b/Platform/Intel/BoardModulePkg/Library/BdsSerialPortTerminalLib/BdsSerialPortTerminalLib.c
new file mode 100644
index 0000000000..178ca2b3ac
--- /dev/null
+++ b/Platform/Intel/BoardModulePkg/Library/BdsSerialPortTerminalLib/BdsSerialPortTerminalLib.c
@@ -0,0 +1,114 @@
+/** @file
+  Main file for NULL named library that adds a Terminal Device connected
+  to SerialDxe to the UEFI Console Variables. This allows BIOS Setup, UEFI
+  Shell, etc. to be used on a headless system via a null modem and terminal
+  emulator.
+
+  Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "BdsSerialPortTerminalLib.h"
+
+GLOBAL_REMOVE_IF_UNREFERENCED EFI_GUID  *mTerminalType[] = {
+  &gEfiPcAnsiGuid,
+  &gEfiVT100Guid,
+  &gEfiVT100PlusGuid,
+  &gEfiVTUTF8Guid,
+  &gEfiTtyTermGuid
+};
+
+GLOBAL_REMOVE_IF_UNREFERENCED SERIAL_DEVICE_PATH mSerialDevicePath = {
+  {
+    {
+      HARDWARE_DEVICE_PATH,
+      HW_VENDOR_DP,
+      {
+        (UINT8) sizeof (VENDOR_DEVICE_PATH),
+        (UINT8) ((sizeof (VENDOR_DEVICE_PATH)) >> 8)
+      }
+    },
+    EDKII_SERIAL_PORT_LIB_VENDOR_GUID
+  },
+  {
+    {
+      MESSAGING_DEVICE_PATH,
+      MSG_UART_DP,
+      {
+        (UINT8) sizeof (UART_DEVICE_PATH),
+        (UINT8) ((sizeof (UART_DEVICE_PATH)) >> 8)
+      }
+    },
+    0,                  // Reserved
+    115200,             // BaudRate
+    8,                  // DataBits
+    1,                  // Parity
+    1                   // StopBits
+  },
+  {
+    {
+      MESSAGING_DEVICE_PATH,
+      MSG_VENDOR_DP,
+      {
+        (UINT8) (sizeof (VENDOR_DEVICE_PATH)),
+        (UINT8) ((sizeof (VENDOR_DEVICE_PATH)) >> 8),
+      }
+    },
+    DEVICE_PATH_MESSAGING_PC_ANSI
+  },
+  gEndEntire
+};
+
+/**
+  Updates the ConOut, ConIn, ErrOut variables with the serial terminal device path
+  @param                        none
+  @retval                       none
+**/
+VOID
+AddSerialTerminal (
+  VOID
+  )
+{
+  DEBUG ((DEBUG_INFO, "[AddSerialPortTerminal]\n"));
+
+  //
+  // Update the Terminal Device Configuration Parameters
+  //
+  mSerialDevicePath.Uart.BaudRate = PcdGet64 (PcdUartDefaultBaudRate);
+  mSerialDevicePath.Uart.DataBits = PcdGet8 (PcdUartDefaultDataBits);
+  mSerialDevicePath.Uart.Parity   = PcdGet8 (PcdUartDefaultParity);
+  mSerialDevicePath.Uart.StopBits = PcdGet8 (PcdUartDefaultStopBits);
+  CopyMem (
+    (VOID *) &(mSerialDevicePath.TerminalType.Guid),
+    (VOID *) mTerminalType[PcdGet8 (PcdDefaultTerminalType)],
+    sizeof (EFI_GUID)
+    );
+
+  //
+  // Append Serial Terminal into "ConIn", "ConOut", and "ErrOut"
+  //
+  EfiBootManagerUpdateConsoleVariable (ConOut, (EFI_DEVICE_PATH_PROTOCOL *) &mSerialDevicePath, NULL);
+  EfiBootManagerUpdateConsoleVariable (ConIn, (EFI_DEVICE_PATH_PROTOCOL *) &mSerialDevicePath, NULL);
+  EfiBootManagerUpdateConsoleVariable (ErrOut, (EFI_DEVICE_PATH_PROTOCOL *) &mSerialDevicePath, NULL);
+}
+
+/**
+  Constructor for the Serial Port Terminal Device library.
+
+  @param ImageHandle    The Image Handle of the process
+  @param SystemTable    The EFI System Table pointer
+
+  @retval EFI_SUCCESS   The Serial Port Terminal Device was installed successfully
+**/
+EFI_STATUS
+EFIAPI
+SerialPortTerminalLibConstructor (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  AddSerialTerminal ();
+
+  return EFI_SUCCESS;
+}
diff --git a/Platform/Intel/BoardModulePkg/Library/BdsSerialPortTerminalLib/BdsSerialPortTerminalLib.h b/Platform/Intel/BoardModulePkg/Library/BdsSerialPortTerminalLib/BdsSerialPortTerminalLib.h
new file mode 100644
index 0000000000..39d6486712
--- /dev/null
+++ b/Platform/Intel/BoardModulePkg/Library/BdsSerialPortTerminalLib/BdsSerialPortTerminalLib.h
@@ -0,0 +1,53 @@
+/** @file
+  Header file for NULL named library that adds a Terminal Device
+  connected to SerialDxe to the UEFI Console Variables. This allows BIOS Setup,
+  UEFI Shell, etc. to be used on a headless system via a null modem and terminal
+  emulator.
+
+  Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef BDS_SERIAL_PORT_TERMINAL_LIB_H_
+#define BDS_SERIAL_PORT_TERMINAL_LIB_H_
+
+#include <Uefi.h>
+#include <Guid/SerialPortLibVendor.h>
+#include <Library/UefiLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DevicePathLib.h>
+#include <Library/DebugLib.h>
+#include <Library/PcdLib.h>
+#include <Library/UefiBootManagerLib.h>
+
+//
+// Below is the platform console device path
+//
+typedef struct {
+  VENDOR_DEVICE_PATH        Guid;
+  UART_DEVICE_PATH          Uart;
+  VENDOR_DEVICE_PATH        TerminalType;
+  EFI_DEVICE_PATH_PROTOCOL  End;
+} SERIAL_DEVICE_PATH;
+
+#define gPciRootBridge \
+  { \
+    { \
+      ACPI_DEVICE_PATH, \
+      ACPI_DP, \
+      { \
+        (UINT8) (sizeof (ACPI_HID_DEVICE_PATH)), \
+        (UINT8) ((sizeof (ACPI_HID_DEVICE_PATH)) >> 8) \
+      }, \
+    }, \
+    EISA_PNP_ID (0x0A03), \
+    0 \
+  }
+
+#define gEndEntire \
+  { \
+    END_DEVICE_PATH_TYPE, END_ENTIRE_DEVICE_PATH_SUBTYPE, { END_DEVICE_PATH_LENGTH, 0 } \
+  }
+
+#endif
diff --git a/Platform/Intel/BoardModulePkg/Library/BdsSerialPortTerminalLib/BdsSerialPortTerminalLib.inf b/Platform/Intel/BoardModulePkg/Library/BdsSerialPortTerminalLib/BdsSerialPortTerminalLib.inf
new file mode 100644
index 0000000000..befaeee3e5
--- /dev/null
+++ b/Platform/Intel/BoardModulePkg/Library/BdsSerialPortTerminalLib/BdsSerialPortTerminalLib.inf
@@ -0,0 +1,49 @@
+## @file
+# Component information file for NULL named library that adds a Terminal Device
+# connected to SerialDxe to the UEFI Console Variables. This allows BIOS
+# Setup, UEFI Shell, etc. to be used on a headless system via a null modem and
+# terminal emulator.
+#
+# Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>
+#
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+[Defines]
+  INF_VERSION                    = 0x00010006
+  BASE_NAME                      = SerialPortTerminalLib
+  FILE_GUID                      = E12BFA46-95F2-4ADC-9774-7E38DE78741E
+  MODULE_TYPE                    = UEFI_DRIVER
+  VERSION_STRING                 = 1.2
+  LIBRARY_CLASS                  = NULL|UEFI_DRIVER
+  CONSTRUCTOR                    = SerialPortTerminalLibConstructor
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+
+[Sources]
+  BdsSerialPortTerminalLib.c
+  BdsSerialPortTerminalLib.h
+
+[LibraryClasses]
+  BaseMemoryLib
+  DevicePathLib
+  DebugLib
+  UefiDriverEntryPoint
+  UefiBootManagerLib
+  UefiLib
+
+[Guids]
+  gEfiPcAnsiGuid
+  gEfiVT100Guid
+  gEfiVT100PlusGuid
+  gEfiVTUTF8Guid
+  gEfiTtyTermGuid
+
+[Pcd]
+  gEfiMdePkgTokenSpaceGuid.PcdUartDefaultBaudRate
+  gEfiMdePkgTokenSpaceGuid.PcdUartDefaultDataBits
+  gEfiMdePkgTokenSpaceGuid.PcdUartDefaultParity
+  gEfiMdePkgTokenSpaceGuid.PcdUartDefaultStopBits
+  gEfiMdePkgTokenSpaceGuid.PcdDefaultTerminalType
-- 
2.27.0.windows.1



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