PlatformHookLib.c

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#include <Base.h>
#include <PiDxe.h>
#include <UniversalPayload/SerialPortInfo.h>
#include <Library/PlatformHookLib.h>
#include <Library/PcdLib.h>
#include <Library/HobLib.h>
 
EFI_STATUS
EFIAPI
PlatformHookSerialPortConstructor (
  VOID
  )
{
  // Nothing to do here. This constructor is added to
  // enable the chain of constructor invocation for
  // dependent libraries.
  return RETURN_SUCCESS;
}
 
RETURN_STATUS
EFIAPI
PlatformHookSerialPortInitialize (
  VOID
  )
{
  RETURN_STATUS                       Status;
  UNIVERSAL_PAYLOAD_SERIAL_PORT_INFO  *SerialPortInfo;
  UINT8                               *GuidHob;
  UNIVERSAL_PAYLOAD_GENERIC_HEADER    *GenericHeader;
 
  if (GetHobList () == NULL) {
    return RETURN_SUCCESS;
  }
 
  GuidHob = GetFirstGuidHob (&gUniversalPayloadSerialPortInfoGuid);
  if (GuidHob == NULL) {
    return EFI_NOT_FOUND;
  }
 
  GenericHeader = (UNIVERSAL_PAYLOAD_GENERIC_HEADER *)GET_GUID_HOB_DATA (GuidHob);
  if ((sizeof (UNIVERSAL_PAYLOAD_GENERIC_HEADER) > GET_GUID_HOB_DATA_SIZE (GuidHob)) || (GenericHeader->Length > GET_GUID_HOB_DATA_SIZE (GuidHob))) {
    return EFI_NOT_FOUND;
  }
 
  if (GenericHeader->Revision == UNIVERSAL_PAYLOAD_SERIAL_PORT_INFO_REVISION) {
    SerialPortInfo = (UNIVERSAL_PAYLOAD_SERIAL_PORT_INFO *)GET_GUID_HOB_DATA (GuidHob);
    if (GenericHeader->Length < UNIVERSAL_PAYLOAD_SIZEOF_THROUGH_FIELD (UNIVERSAL_PAYLOAD_SERIAL_PORT_INFO, RegisterBase)) {
      //
      // Return if can't find the Serial Port Info Hob with enough length
      //
      return EFI_NOT_FOUND;
    }
 
    Status = PcdSetBoolS (PcdSerialUseMmio, SerialPortInfo->UseMmio);
    if (RETURN_ERROR (Status)) {
      return Status;
    }
 
    Status = PcdSet64S (PcdSerialRegisterBase, SerialPortInfo->RegisterBase);
    if (RETURN_ERROR (Status)) {
      return Status;
    }
 
    Status = PcdSet32S (PcdSerialRegisterStride, SerialPortInfo->RegisterStride);
    if (RETURN_ERROR (Status)) {
      return Status;
    }
 
    Status = PcdSet32S (PcdSerialBaudRate, SerialPortInfo->BaudRate);
    if (RETURN_ERROR (Status)) {
      return Status;
    }
 
    return RETURN_SUCCESS;
  }
 
  return EFI_NOT_FOUND;
}