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- /** @file
- Platform Hook Library instance for 16550 Uart.
- Copyright (c) 2020, ARM Ltd. All rights reserved.<BR>
- SPDX-License-Identifier: BSD-2-Clause-Patent
- **/
- #include <Base.h>
- #include <Uefi.h>
- #include <Pi/PiBootMode.h>
- #include <Pi/PiHob.h>
- #include <Guid/Early16550UartBaseAddress.h>
- #include <Guid/Fdt.h>
- #include <Guid/FdtHob.h>
- #include <Library/BaseLib.h>
- #include <Library/HobLib.h>
- #include <Library/PcdLib.h>
- #include <Library/PlatformHookLib.h>
- /** Platform hook to retrieve the 16550 UART base address from the GUID Hob
- 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
- )
- {
- VOID *Hob;
- UINT64 *UartBase;
- if (PcdGet64 (PcdSerialRegisterBase) != 0) {
- return RETURN_SUCCESS;
- }
- Hob = GetFirstGuidHob (&gEarly16550UartBaseAddressGuid);
- if ((Hob == NULL) || (GET_GUID_HOB_DATA_SIZE (Hob) != sizeof (*UartBase))) {
- return RETURN_NOT_FOUND;
- }
- UartBase = GET_GUID_HOB_DATA (Hob);
- if ((UINTN)*UartBase == 0) {
- return RETURN_NOT_FOUND;
- }
- return (RETURN_STATUS)PcdSet64S (PcdSerialRegisterBase, (UINTN)*UartBase);
- }
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