OvmfPkg/Library/PlatformDebugLibIoPort/DebugLibDetect.c

   1 /** @file
   2   Detection code for QEMU debug port.
   3   Non-SEC instance, caches the result of detection.
   4
   5   Copyright (c) 2017, Red Hat, Inc.<BR>
   6   This program and the accompanying materials
   7   are licensed and made available under the terms and conditions of the BSD License
   8   which accompanies this distribution.  The full text of the license may be found at
   9   http://opensource.org/licenses/bsd-license.php.
  10
  11   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13
  14 **/
  15
  16 #include <Base.h>
  17 #include "DebugLibDetect.h"
  18
  19 //
  20 // Set to TRUE if the debug I/O port is enabled
  21 //
  22 STATIC BOOLEAN mDebugIoPortFound = FALSE;
  23
  24 /**
  25   This constructor function checks if the debug I/O port device is present,
  26   caching the result for later use.
  27
  28   @retval RETURN_SUCCESS   The constructor always returns RETURN_SUCCESS.
  29
  30 **/
  31 RETURN_STATUS
  32 EFIAPI
  33 PlatformDebugLibIoPortConstructor (
  34   VOID
  35   )
  36 {
  37   mDebugIoPortFound = PlatformDebugLibIoPortDetect();
  38   return RETURN_SUCCESS;
  39 }
  40
  41 /**
  42   Return the cached result of detecting the debug I/O port device.
  43
  44   @retval TRUE   if the debug I/O port device was detected.
  45   @retval FALSE  otherwise
  46
  47 **/
  48 BOOLEAN
  49 EFIAPI
  50 PlatformDebugLibIoPortFound (
  51   VOID
  52   )
  53 {
  54   return mDebugIoPortFound;
  55 }