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https://github.com/CloverHackyColor/CloverBootloader.git
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57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
/** @file
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Platform Hook Library instance for 16550 Uart.
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Copyright (c) 2020, ARM Ltd. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Base.h>
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#include <Uefi.h>
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#include <Pi/PiBootMode.h>
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#include <Pi/PiHob.h>
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#include <Guid/Early16550UartBaseAddress.h>
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#include <Guid/Fdt.h>
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#include <Guid/FdtHob.h>
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#include <Library/BaseLib.h>
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#include <Library/HobLib.h>
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#include <Library/PcdLib.h>
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#include <Library/PlatformHookLib.h>
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/** Platform hook to retrieve the 16550 UART base address from the GUID Hob
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that caches the UART base address from early boot stage and store it in
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PcdSerialRegisterBase.
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@retval RETURN_SUCCESS Success.
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@retval RETURN_NOT_FOUND Serial Port information not found.
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**/
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RETURN_STATUS
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EFIAPI
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PlatformHookSerialPortInitialize (
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VOID
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)
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{
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VOID *Hob;
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UINT64 *UartBase;
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if (PcdGet64 (PcdSerialRegisterBase) != 0) {
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return RETURN_SUCCESS;
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}
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Hob = GetFirstGuidHob (&gEarly16550UartBaseAddressGuid);
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if ((Hob == NULL) || (GET_GUID_HOB_DATA_SIZE (Hob) != sizeof (*UartBase))) {
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return RETURN_NOT_FOUND;
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}
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UartBase = GET_GUID_HOB_DATA (Hob);
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if ((UINTN)*UartBase == 0) {
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return RETURN_NOT_FOUND;
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}
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return (RETURN_STATUS)PcdSet64S (PcdSerialRegisterBase, (UINTN)*UartBase);
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}
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