[mirror_edk2.git] / OvmfPkg / Library / PlatformDebugLibIoPort / DebugIoPortQemu.c

/** @file\r
  Detection code for QEMU debug port.\r
\r
  Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>\r
  Copyright (c) 2012, Red Hat, Inc.<BR>\r
  Copyright (c) 2020, Citrix Systems, Inc.\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include <Library/IoLib.h>\r
#include <Library/PcdLib.h>\r
#include "DebugLibDetect.h"\r
\r
//\r
// The constant value that is read from the debug I/O port\r
//\r
#define BOCHS_DEBUG_PORT_MAGIC    0xE9\r
\r
/**\r
  Return the result of detecting the debug I/O port device.\r
\r
  @retval TRUE   if the debug I/O port device was detected.\r
  @retval FALSE  otherwise\r
\r
**/\r
BOOLEAN\r
EFIAPI\r
PlatformDebugLibIoPortDetect (\r
  VOID\r
  )\r
{\r
  return IoRead8 (PcdGet16 (PcdDebugIoPort)) == BOCHS_DEBUG_PORT_MAGIC;\r
}\r
Commit	Line	Data
52f01212 AP	1	/** @file\r
	2	Detection code for QEMU debug port.\r
	3	\r
	4	Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>\r
	5	Copyright (c) 2012, Red Hat, Inc.<BR>\r
	6	Copyright (c) 2020, Citrix Systems, Inc.\r
	7	SPDX-License-Identifier: BSD-2-Clause-Patent\r
	8	\r
	9	**/\r
	10	\r
	11	#include <Library/IoLib.h>\r
	12	#include <Library/PcdLib.h>\r
	13	#include "DebugLibDetect.h"\r
	14	\r
	15	//\r
	16	// The constant value that is read from the debug I/O port\r
	17	//\r
	18	#define BOCHS_DEBUG_PORT_MAGIC 0xE9\r
	19	\r
	20	/**\r
	21	Return the result of detecting the debug I/O port device.\r
	22	\r
	23	@retval TRUE if the debug I/O port device was detected.\r
	24	@retval FALSE otherwise\r
	25	\r
	26	**/\r
	27	BOOLEAN\r
	28	EFIAPI\r
	29	PlatformDebugLibIoPortDetect (\r
	30	VOID\r
	31	)\r
	32	{\r
	33	return IoRead8 (PcdGet16 (PcdDebugIoPort)) == BOCHS_DEBUG_PORT_MAGIC;\r
	34	}\r