OvmfPkg/Library/PlatformDebugLibIoPort/DebugIoPortQemu.c

   1 /** @file
   2   Detection code for QEMU debug port.
   3
   4   Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
   5   Copyright (c) 2012, Red Hat, Inc.<BR>
   6   Copyright (c) 2020, Citrix Systems, Inc.
   7   SPDX-License-Identifier: BSD-2-Clause-Patent
   8
   9 **/
  10
  11 #include <Library/IoLib.h>
  12 #include <Library/PcdLib.h>
  13 #include "DebugLibDetect.h"
  14
  15 //
  16 // The constant value that is read from the debug I/O port
  17 //
  18 #define BOCHS_DEBUG_PORT_MAGIC  0xE9
  19
  20 /**
  21   Return the result of detecting the debug I/O port device.
  22
  23   @retval TRUE   if the debug I/O port device was detected.
  24   @retval FALSE  otherwise
  25
  26 **/
  27 BOOLEAN
  28 EFIAPI
  29 PlatformDebugLibIoPortDetect (
  30   VOID
  31   )
  32 {
  33   return IoRead8 (PcdGet16 (PcdDebugIoPort)) == BOCHS_DEBUG_PORT_MAGIC;
  34 }