UefiPayloadPkg/Library/PlatformHookLib/PlatformHookLib.c

   1 /** @file
   2   Platform Hook Library instance for UART device.
   3
   4   Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include <Base.h>
  10 #include <PiDxe.h>
  11 #include <UniversalPayload/SerialPortInfo.h>
  12 #include <Library/PlatformHookLib.h>
  13 #include <Library/PcdLib.h>
  14 #include <Library/HobLib.h>
  15
  16 /** Library Constructor
  17
  18   @retval RETURN_SUCCESS  Success.
  19 **/
  20 EFI_STATUS
  21 EFIAPI
  22 PlatformHookSerialPortConstructor (
  23   VOID
  24   )
  25 {
  26   // Nothing to do here. This constructor is added to
  27   // enable the chain of constructor invocation for
  28   // dependent libraries.
  29   return RETURN_SUCCESS;
  30 }
  31
  32 /**
  33   Performs platform specific initialization required for the CPU to access
  34   the hardware associated with a SerialPortLib instance.  This function does
  35   not initialize the serial port hardware itself.  Instead, it initializes
  36   hardware devices that are required for the CPU to access the serial port
  37   hardware.  This function may be called more than once.
  38
  39   @retval RETURN_SUCCESS       The platform specific initialization succeeded.
  40   @retval RETURN_DEVICE_ERROR  The platform specific initialization could not be completed.
  41
  42 **/
  43 RETURN_STATUS
  44 EFIAPI
  45 PlatformHookSerialPortInitialize (
  46   VOID
  47   )
  48 {
  49   RETURN_STATUS                       Status;
  50   UNIVERSAL_PAYLOAD_SERIAL_PORT_INFO  *SerialPortInfo;
  51   UINT8                               *GuidHob;
  52   UNIVERSAL_PAYLOAD_GENERIC_HEADER    *GenericHeader;
  53
  54   GuidHob = GetFirstGuidHob (&gUniversalPayloadSerialPortInfoGuid);
  55   if (GuidHob == NULL) {
  56     return EFI_NOT_FOUND;
  57   }
  58
  59   GenericHeader = (UNIVERSAL_PAYLOAD_GENERIC_HEADER *)GET_GUID_HOB_DATA (GuidHob);
  60   if ((sizeof (UNIVERSAL_PAYLOAD_GENERIC_HEADER) > GET_GUID_HOB_DATA_SIZE (GuidHob)) || (GenericHeader->Length > GET_GUID_HOB_DATA_SIZE (GuidHob))) {
  61     return EFI_NOT_FOUND;
  62   }
  63
  64   if (GenericHeader->Revision == UNIVERSAL_PAYLOAD_SERIAL_PORT_INFO_REVISION) {
  65     SerialPortInfo = (UNIVERSAL_PAYLOAD_SERIAL_PORT_INFO *)GET_GUID_HOB_DATA (GuidHob);
  66     if (GenericHeader->Length < UNIVERSAL_PAYLOAD_SIZEOF_THROUGH_FIELD (UNIVERSAL_PAYLOAD_SERIAL_PORT_INFO, RegisterBase)) {
  67       //
  68       // Return if can't find the Serial Port Info Hob with enough length
  69       //
  70       return EFI_NOT_FOUND;
  71     }
  72
  73     Status = PcdSetBoolS (PcdSerialUseMmio, SerialPortInfo->UseMmio);
  74     if (RETURN_ERROR (Status)) {
  75       return Status;
  76     }
  77
  78     Status = PcdSet64S (PcdSerialRegisterBase, SerialPortInfo->RegisterBase);
  79     if (RETURN_ERROR (Status)) {
  80       return Status;
  81     }
  82
  83     Status = PcdSet32S (PcdSerialRegisterStride, SerialPortInfo->RegisterStride);
  84     if (RETURN_ERROR (Status)) {
  85       return Status;
  86     }
  87
  88     Status = PcdSet32S (PcdSerialBaudRate, SerialPortInfo->BaudRate);
  89     if (RETURN_ERROR (Status)) {
  90       return Status;
  91     }
  92
  93     return RETURN_SUCCESS;
  94   }
  95
  96   return EFI_NOT_FOUND;
  97 }