mirror of https://github.com/acidanthera/audk.git
57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
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/** @file
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Platform Hook Library instance for UART device upon coreboot.
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Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <Base.h>
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#include <Uefi/UefiBaseType.h>
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#include <Library/PlatformHookLib.h>
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#include <Library/CbParseLib.h>
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#include <Library/PcdLib.h>
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/**
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Performs platform specific initialization required for the CPU to access
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the hardware associated with a SerialPortLib instance. This function does
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not intiailzie the serial port hardware itself. Instead, it initializes
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hardware devices that are required for the CPU to access the serial port
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hardware. This function may be called more than once.
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@retval RETURN_SUCCESS The platform specific initialization succeeded.
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@retval RETURN_DEVICE_ERROR The platform specific initialization could not be completed.
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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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RETURN_STATUS Status;
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UINT32 SerialRegBase;
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UINT32 SerialRegAccessType;
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Status = CbParseSerialInfo (&SerialRegBase, &SerialRegAccessType, NULL);
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if (RETURN_ERROR (Status)) {
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return Status;
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}
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if (SerialRegAccessType == 2) { //MMIO
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PcdSetBoolS (PcdSerialUseMmio, TRUE);
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} else { //IO
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PcdSetBoolS (PcdSerialUseMmio, FALSE);
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}
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PcdSet64S (PcdSerialRegisterBase, (UINT64) SerialRegBase);
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return RETURN_SUCCESS;
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}
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