1 files changed, 38 insertions, 0 deletions
diff --git a/OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/Fdt16550SerialPortHookLib.c b/OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/Fdt16550SerialPortHookLib.c
new file mode 100644
index 0000000..baaa7ae
--- /dev/null
+++ b/OvmfPkg/LoongArchVirt/Library/Fdt16550SerialPortHookLib/Fdt16550SerialPortHookLib.c
@@ -0,0 +1,38 @@
+/** @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 <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);
+}