[edk2-devel] [PATCH v7 28/37] OvmfPkg/LoongArchVirt: Add serial port hook library

["Chao Li" <lichao@loongson.cn>]

Add a serial port hook library in LoongArchVirt named
Fdt16550SerialProtHookLib, this library is referenced from ArmVirtPkg.

LoongArch QEMU virtual machine uses register of LOONGARCH_CSR_KS1 to
transfer serial port base addres from the PEI phase to the DXE phase.

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4584

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Bibo Mao <maobibo@loongson.cn>
Cc: Dongyan Qian <qiandongyan@loongson.cn>
Signed-off-by: Chao Li <lichao@loongson.cn>
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
---
 .../EarlyFdt16550SerialPortHookLib.c          | 52 +++++++++++++++++++
 .../EarlyFdt16550SerialPortHookLib.inf        | 37 +++++++++++++
 .../Fdt16550SerialPortHookLib.c               | 39 ++++++++++++++
 .../Fdt16550SerialPortHookLib.inf             | 33 ++++++++++++
 .../Fdt16550SerialPortHookLib.uni             | 14 +++++
 5 files changed, 175 insertions(+)
 create mode 100644 OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/EarlyFdt16550SerialPortHookLib.c
 create mode 100644 OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/EarlyFdt16550SerialPortHookLib.inf
 create mode 100644 OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/Fdt16550SerialPortHookLib.c
 create mode 100644 OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/Fdt16550SerialPortHookLib.inf
 create mode 100644 OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/Fdt16550SerialPortHookLib.uni

diff --git a/OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/EarlyFdt16550SerialPortHookLib.c b/OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/EarlyFdt16550SerialPortHookLib.c
new file mode 100644
index 0000000000..9f1fcc970a
--- /dev/null
+++ b/OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/EarlyFdt16550SerialPortHookLib.c
@@ -0,0 +1,52 @@
+/** @file
+  PEI Phase Early Platform Hook Library instance for 16550 Uart.
+
+  Copyright (c) 2020 - 2023, Arm Ltd. All rights reserved.<BR>
+  Copyright (c) 2024 Loongson Technology Corporation Limited. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/BaseLib.h>
+#include <Library/FdtSerialPortAddressLib.h>
+#include <Library/PcdLib.h>
+#include <Library/PlatformHookLib.h>
+#include <Register/LoongArch64/Csr.h>
+
+/** Platform hook to retrieve the 16550 UART base address from the platform
+    Device tree and store it in the reigster LOONGARCH_CSR_KS1.
+
+  @retval RETURN_SUCCESS            Success.
+  @retval RETURN_INVALID_PARAMETER  A parameter was invalid.
+  @retval RETURN_NOT_FOUND          Serial port information not found.
+
+**/
+RETURN_STATUS
+EFIAPI
+PlatformHookSerialPortInitialize (
+  VOID
+  )
+{
+  RETURN_STATUS  Status;
+  VOID           *DeviceTreeBase;
+  UINT64         SerialConsoleAddress;
+
+  if (PcdGet64 (PcdSerialRegisterBase) != 0) {
+    return RETURN_SUCCESS;
+  }
+
+  DeviceTreeBase = (VOID *)(UINTN)PcdGet64 (PcdDeviceTreeInitialBaseAddress);
+  if (DeviceTreeBase == NULL) {
+    return RETURN_NOT_FOUND;
+  }
+
+  Status = FdtSerialGetConsolePort (DeviceTreeBase, &SerialConsoleAddress);
+  if (RETURN_ERROR (Status)) {
+    return Status;
+  }
+
+  CsrWrite (LOONGARCH_CSR_KS1, (UINTN)SerialConsoleAddress);
+
+  return RETURN_SUCCESS;
+}
diff --git a/OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/EarlyFdt16550SerialPortHookLib.inf b/OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/EarlyFdt16550SerialPortHookLib.inf
new file mode 100644
index 0000000000..55b0c03a01
--- /dev/null
+++ b/OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/EarlyFdt16550SerialPortHookLib.inf
@@ -0,0 +1,37 @@
+## @file
+#  PEI Phase Early Platform Hook Library instance for 16550 Uart.
+#
+#  Copyright (c) 2020, ARM Ltd. All rights reserved.<BR>
+#  Copyright (c) 2024 Loongson Technology Corporation Limited. All rights reserved.<BR>
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 1.29
+  BASE_NAME                      = EarlyFdt16550SerialPortHookLib
+  MODULE_UNI_FILE                = Fdt16550SerialPortHookLib.uni
+  FILE_GUID                      = 6A5FEBCB-C676-A7C1-A96C-B79D4860EEC5
+  MODULE_TYPE                    = PEIM
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = PlatformHookLib|SEC PEI_CORE PEIM
+
+[Sources]
+  EarlyFdt16550SerialPortHookLib.c
+
+[LibraryClasses]
+  BaseLib
+  PcdLib
+  FdtLib
+  FdtSerialPortAddressLib
+
+[Packages]
+  EmbeddedPkg/EmbeddedPkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  MdePkg/MdePkg.dec
+  OvmfPkg/OvmfPkg.dec
+
+[Pcd]
+  gUefiOvmfPkgTokenSpaceGuid.PcdDeviceTreeInitialBaseAddress
+  gEfiMdeModulePkgTokenSpaceGuid.PcdSerialRegisterBase
diff --git a/OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/Fdt16550SerialPortHookLib.c b/OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/Fdt16550SerialPortHookLib.c
new file mode 100644
index 0000000000..fd188f75b8
--- /dev/null
+++ b/OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/Fdt16550SerialPortHookLib.c
@@ -0,0 +1,39 @@
+/** @file
+  Platform Hook Library instance for 16550 Uart.
+
+  Copyright (c) 2020, ARM Ltd. All rights reserved.<BR>
+  Copyright (c) 2024 Loongson Technology Corporation Limited. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/BaseLib.h>
+#include <Library/PcdLib.h>
+#include <Library/PlatformHookLib.h>
+#include <Register/LoongArch64/Csr.h>
+
+/** Platform hook to retrieve the 16550 UART base address from register
+    LOONGARCH_CSR_KS1 that caches the UART base address from early boot
+    stage and store it in  PcdSerialRegisterBase.
+
+  @retval RETURN_SUCCESS    Success.
+  @retval RETURN_NOT_FOUND  Serial Port information not found.
+
+**/
+RETURN_STATUS
+EFIAPI
+PlatformHookSerialPortInitialize (
+  VOID
+  )
+{
+  UINT64  *UartBase;
+
+  if (PcdGet64 (PcdSerialRegisterBase) != 0) {
+    return RETURN_SUCCESS;
+  }
+
+  *UartBase = CsrRead (LOONGARCH_CSR_KS1);
+
+  return (RETURN_STATUS)PcdSet64S (PcdSerialRegisterBase, (UINTN)*UartBase);
+}
diff --git a/OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/Fdt16550SerialPortHookLib.inf b/OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/Fdt16550SerialPortHookLib.inf
new file mode 100644
index 0000000000..b5fc03a284
--- /dev/null
+++ b/OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/Fdt16550SerialPortHookLib.inf
@@ -0,0 +1,33 @@
+## @file
+#  Platform Hook Library instance for 16550 Uart.
+#
+#  Copyright (c) 2020, ARM Ltd. All rights reserved.<BR>
+#  Copyright (c) 2024 Loongson Technology Corporation Limited. All rights reserved.<BR>
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 1.29
+  BASE_NAME                      = Fdt16550SerialPortHookLib
+  MODULE_UNI_FILE                = Fdt16550SerialPortHookLib.uni
+  FILE_GUID                      = 808335DB-220E-A353-887C-9AA1B7D433A1
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = PlatformHookLib|DXE_CORE DXE_DRIVER UEFI_DRIVER DXE_RUNTIME_DRIVER UEFI_APPLICATION
+  CONSTRUCTOR                    = PlatformHookSerialPortInitialize
+
+[Sources]
+  Fdt16550SerialPortHookLib.c
+
+[LibraryClasses]
+  BaseLib
+  PcdLib
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+
+[Pcd]
+  gEfiMdeModulePkgTokenSpaceGuid.PcdSerialRegisterBase
diff --git a/OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/Fdt16550SerialPortHookLib.uni b/OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/Fdt16550SerialPortHookLib.uni
new file mode 100644
index 0000000000..92eb2ed0b4
--- /dev/null
+++ b/OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/Fdt16550SerialPortHookLib.uni
@@ -0,0 +1,14 @@
+// /** @file
+// Platform Hook Library instance for 16550 Uart.
+//
+//
+// Copyright (c) 2020, ARM Ltd. All rights reserved.<BR>
+// Copyright (c) 2024 Loongson Technology Corporation Limited. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+#string STR_MODULE_ABSTRACT     #language en-US "Platform Hook Library instance for 16550 Uart."
+
+#string STR_MODULE_DESCRIPTION  #language en-US "Platform Hook Library instance for 16550 Uart."
-- 
2.27.0



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