audk/OvmfPkg/Library/PlatformDebugLibIoPort/DebugLibDetect.c

/** @file
  Detection code for QEMU debug port.
  Non-SEC instance, caches the result of detection.

  Copyright (c) 2017, Red Hat, Inc.<BR>
  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php.

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include <Base.h>
#include "DebugLibDetect.h"

//
// Set to TRUE if the debug I/O port is enabled
//
STATIC BOOLEAN mDebugIoPortFound = FALSE;

/**
  This constructor function checks if the debug I/O port device is present,
  caching the result for later use.

  @retval RETURN_SUCCESS   The constructor always returns RETURN_SUCCESS.

**/
RETURN_STATUS
EFIAPI
PlatformDebugLibIoPortConstructor (
  VOID
  )
{
  mDebugIoPortFound = PlatformDebugLibIoPortDetect();
  return RETURN_SUCCESS;
}

/**
  Return the cached result of detecting the debug I/O port device.

  @retval TRUE   if the debug I/O port device was detected.
  @retval FALSE  otherwise

**/
BOOLEAN
EFIAPI
PlatformDebugLibIoPortFound (
  VOID
  )
{
  return mDebugIoPortFound;
}