[mirror_edk2.git] / SourceLevelDebugPkg / Library / DebugCommunicationLibSerialPort / DebugCommunicationLibSerialPort.c

/** @file\r
  Debug Port Library implementation based on serial port.\r
\r
  Copyright (c) 2010 - 2014, Intel Corporation. All rights reserved.<BR>\r
  This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php.\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include <Base.h>\r
\r
#include <Library/DebugCommunicationLib.h>\r
#include <Library/SerialPortLib.h>\r
#include <Library/TimerLib.h>\r
#include <Library/DebugLib.h>\r
#include <Library/BaseLib.h>\r
#include <Library/BaseMemoryLib.h>\r
\r
#pragma pack(1)\r
//\r
// The internal data structure of DEBUG_PORT_HANDLE, which stores some\r
// important datum which are used across various phases.\r
//\r
typedef struct _SERIAL_DEBUG_PORT_HANDLE{\r
  //\r
  // Timter settings\r
  //\r
  UINT64       TimerFrequency;\r
  UINT64       TimerCycle;\r
  BOOLEAN      TimerCountDown;\r
} SERIAL_DEBUG_PORT_HANDLE;\r
#pragma pack()\r
\r
//\r
// The global variable which can be used after memory is ready.\r
//\r
SERIAL_DEBUG_PORT_HANDLE     mSerialDebugPortHandle;\r
\r
/**\r
  Check if the timer is timeout.\r
  \r
  @param[in] SerialDebugPortHandle  Pointer to Serial Debug port handle\r
  @param[in] Timer                  The start timer from the begin.\r
  @param[in] TimeoutTicker          Ticker number need time out.\r
\r
  @return TRUE  Timer time out occurs.\r
  @retval FALSE Timer does not time out.\r
\r
**/\r
BOOLEAN\r
IsTimerTimeout (\r
  IN SERIAL_DEBUG_PORT_HANDLE   *SerialDebugPortHandle,\r
  IN UINT64                     Timer,\r
  IN UINT64                     TimeoutTicker\r
  )\r
{\r
  UINT64  CurrentTimer;\r
  UINT64  Delta;\r
\r
  CurrentTimer = GetPerformanceCounter ();\r
\r
  if (SerialDebugPortHandle->TimerCountDown) {\r
    //\r
    // The timer counter counts down.  Check for roll over condition.\r
    //\r
    if (CurrentTimer < Timer) {\r
      Delta = Timer - CurrentTimer;\r
    } else {\r
      //\r
      // Handle one roll-over. \r
      //\r
      Delta = SerialDebugPortHandle->TimerCycle - (CurrentTimer - Timer);\r
    }\r
  } else {\r
    //\r
    // The timer counter counts up.  Check for roll over condition.\r
    //\r
    if (CurrentTimer > Timer) {\r
      Delta = CurrentTimer - Timer;\r
    } else {\r
      //\r
      // Handle one roll-over. \r
      //\r
      Delta = SerialDebugPortHandle->TimerCycle - (Timer - CurrentTimer);\r
    }\r
  }\r
 \r
  return (BOOLEAN) (Delta >= TimeoutTicker);\r
}\r
\r
/**\r
  Initialize the debug port.\r
\r
  This function will initialize debug port to get it ready for data transmition. If\r
  certain Debug Communication Library instance has to save some private data in the\r
  stack, this function must work on the mode that doesn't return to the caller, then\r
  the caller needs to wrap up all rest of logic after DebugPortInitialize() into one\r
  function and pass it into DebugPortInitialize(). DebugPortInitialize() is\r
  responsible to invoke the passing-in funciton at the end of DebugPortInitialize().\r
\r
  If the paramter Function is not NULL, Debug Communication Libary instance will\r
  invoke it by passing in the Context to be the first parameter. Debug Communication\r
  Library instance could create one debug port handle to be the second parameter\r
  passing into the Function. Debug Communication Library instance also could pass\r
  NULL to be the second parameter if it doesn't create the debug port handle.\r
\r
  If the parameter Function is NULL, and Context is not NULL. At this time, Context\r
  is the debug port handle created by the previous Debug Communication Library\r
  instance.\r
  a) If the instance can understand and continue use the private data of the previous\r
     instance, it could return the same handle as passed in (as Context parameter).\r
  b) If the instance does not understand, or does not want to continue use the\r
     private data of the previous instance, it could ignore the input Context parameter\r
     and create the new handle to be returned.\r
\r
  If Function() is NULL and Context is NULL, Debug Communication Library could create a\r
  new handle and return it. NULL is also a valid handle to be returned.\r
\r
  @param[in] Context      Context needed by callback function; it was optional.\r
  @param[in] Function     Continue function called by Debug Communication library;\r
                          it was optional.\r
\r
  @return  The debug port handle created by Debug Communication Library if Function\r
           is not NULL.\r
\r
**/\r
DEBUG_PORT_HANDLE\r
EFIAPI\r
DebugPortInitialize (\r
  IN VOID                 *Context,\r
  IN DEBUG_PORT_CONTINUE  Function\r
  )\r
{\r
  RETURN_STATUS              Status;\r
  SERIAL_DEBUG_PORT_HANDLE   Handle;\r
  SERIAL_DEBUG_PORT_HANDLE   *SerialDebugPortHandle;\r
  UINT64                     TimerStartValue;\r
  UINT64                     TimerEndValue;\r
\r
  //\r
  // Validate the PCD PcdDebugPortHandleBufferSize value \r
  //\r
  ASSERT (PcdGet16 (PcdDebugPortHandleBufferSize) == sizeof (SERIAL_DEBUG_PORT_HANDLE));\r
\r
  if (Context != NULL && Function == NULL) {\r
    SerialDebugPortHandle = (SERIAL_DEBUG_PORT_HANDLE *)Context;\r
  } else {\r
    ZeroMem (&Handle, sizeof (SERIAL_DEBUG_PORT_HANDLE));\r
    SerialDebugPortHandle = &Handle;\r
  }\r
  SerialDebugPortHandle->TimerFrequency = GetPerformanceCounterProperties (\r
                                            &TimerStartValue,\r
                                            &TimerEndValue\r
                                            );\r
  DEBUG ((EFI_D_INFO, "Serial Debug Port: TimerFrequency  = 0x%lx\n", SerialDebugPortHandle->TimerFrequency)); \r
  DEBUG ((EFI_D_INFO, "Serial Debug Port: TimerStartValue = 0x%lx\n", TimerStartValue)); \r
  DEBUG ((EFI_D_INFO, "Serial Debug Port: TimerEndValue   = 0x%lx\n", TimerEndValue)); \r
\r
  if (TimerEndValue < TimerStartValue) {\r
    SerialDebugPortHandle->TimerCountDown = TRUE;\r
    SerialDebugPortHandle->TimerCycle     = TimerStartValue - TimerEndValue;\r
  } else {\r
    SerialDebugPortHandle->TimerCountDown = FALSE;\r
    SerialDebugPortHandle->TimerCycle     = TimerEndValue - TimerStartValue;\r
  }  \r
\r
  if (Function == NULL && Context != NULL) {\r
    return (DEBUG_PORT_HANDLE *) Context;\r
  }\r
\r
  Status = SerialPortInitialize ();\r
  if (RETURN_ERROR(Status)) {\r
    DEBUG ((EFI_D_ERROR, "Debug Serial Port: Initialization failed!\n")); \r
  }\r
\r
  if (Function != NULL) {\r
    Function (Context, SerialDebugPortHandle);\r
  } else {\r
    CopyMem(&mSerialDebugPortHandle, SerialDebugPortHandle, sizeof (SERIAL_DEBUG_PORT_HANDLE));\r
  }\r
\r
  return (DEBUG_PORT_HANDLE)(UINTN)&mSerialDebugPortHandle;\r
}\r
\r
/**\r
  Read data from debug device and save the datas in buffer.\r
\r
  Reads NumberOfBytes data bytes from a debug device into the buffer\r
  specified by Buffer. The number of bytes actually read is returned.\r
  If the return value is less than NumberOfBytes, then the rest operation failed.\r
  If NumberOfBytes is zero, then return 0.\r
\r
  @param  Handle           Debug port handle.\r
  @param  Buffer           Pointer to the data buffer to store the data read from the debug device.\r
  @param  NumberOfBytes    Number of bytes which will be read.\r
  @param  Timeout          Timeout value for reading from debug device. It unit is Microsecond.\r
\r
  @retval 0                Read data failed, no data is to be read.\r
  @retval >0               Actual number of bytes read from debug device.\r
\r
**/\r
UINTN\r
EFIAPI\r
DebugPortReadBuffer (\r
  IN DEBUG_PORT_HANDLE     Handle,\r
  IN UINT8                 *Buffer,\r
  IN UINTN                 NumberOfBytes,\r
  IN UINTN                 Timeout\r
  )\r
{\r
  SERIAL_DEBUG_PORT_HANDLE *SerialDebugPortHandle;\r
  UINTN                    Index;\r
  UINT64                   Begin;\r
  UINT64                   TimeoutTicker;\r
  UINT64                   TimerRound;\r
  \r
  //\r
  // If Handle is NULL, it means memory is ready for use.\r
  // Use global variable to store handle value.\r
  //\r
  if (Handle == NULL) {\r
    SerialDebugPortHandle = &mSerialDebugPortHandle;\r
  } else {\r
    SerialDebugPortHandle = (SERIAL_DEBUG_PORT_HANDLE *)Handle;\r
  }\r
\r
  Begin         = 0;\r
  TimeoutTicker = 0;  \r
  TimerRound    = 0;\r
  if (Timeout != 0) {\r
    Begin = GetPerformanceCounter ();\r
    TimeoutTicker = DivU64x32 (\r
                      MultU64x64 (\r
                        SerialDebugPortHandle->TimerFrequency,\r
                        Timeout\r
                        ),\r
                      1000000u\r
                      );\r
    TimerRound = DivU64x64Remainder (\r
                   TimeoutTicker,\r
                   DivU64x32 (SerialDebugPortHandle->TimerCycle, 2),\r
                   &TimeoutTicker\r
                   );\r
  }\r
  Index = 0;\r
  while (Index < NumberOfBytes) {\r
    if (SerialPortPoll () || Timeout == 0) {\r
      SerialPortRead (Buffer + Index, 1);\r
      Index ++; \r
      continue;\r
    }\r
    if (TimerRound == 0) {\r
      if (IsTimerTimeout (SerialDebugPortHandle, Begin, TimeoutTicker)) {\r
        //\r
        // If time out occurs.\r
        //\r
        return 0;\r
      }\r
    } else {\r
      if (IsTimerTimeout (SerialDebugPortHandle, Begin, DivU64x32 (SerialDebugPortHandle->TimerCycle, 2))) {\r
        TimerRound --;\r
      }\r
    }\r
  }\r
\r
  return Index;\r
}\r
\r
/**\r
  Write data from buffer to debug device.\r
\r
  Writes NumberOfBytes data bytes from Buffer to the debug device.\r
  The number of bytes actually written to the debug device is returned.\r
  If the return value is less than NumberOfBytes, then the write operation failed.\r
  If NumberOfBytes is zero, then return 0.\r
\r
  @param  Handle           Debug port handle.\r
  @param  Buffer           Pointer to the data buffer to be written.\r
  @param  NumberOfBytes    Number of bytes to written to the debug device.\r
\r
  @retval 0                NumberOfBytes is 0.\r
  @retval >0               The number of bytes written to the debug device.\r
                           If this value is less than NumberOfBytes, then the read operation failed.\r
\r
**/\r
UINTN\r
EFIAPI\r
DebugPortWriteBuffer (\r
  IN DEBUG_PORT_HANDLE     Handle,\r
  IN UINT8                 *Buffer,\r
  IN UINTN                 NumberOfBytes\r
  )\r
{\r
  return SerialPortWrite (Buffer, NumberOfBytes);\r
}\r
\r
/**\r
  Polls a debug device to see if there is any data waiting to be read.\r
\r
  Polls a debug device to see if there is any data waiting to be read.\r
  If there is data waiting to be read from the debug device, then TRUE is returned.\r
  If there is no data waiting to be read from the debug device, then FALSE is returned.\r
\r
  @param  Handle           Debug port handle.\r
\r
  @retval TRUE             Data is waiting to be read from the debug device.\r
  @retval FALSE            There is no data waiting to be read from the serial device.\r
\r
**/\r
BOOLEAN\r
EFIAPI\r
DebugPortPollBuffer (\r
  IN DEBUG_PORT_HANDLE     Handle\r
  )\r
{\r
  return SerialPortPoll ();\r
}\r
\r
Commit	Line	Data
18b144ea	1	/** @file\r
	2	Debug Port Library implementation based on serial port.\r
	3	\r
f95e6f6b	4	Copyright (c) 2010 - 2014, Intel Corporation. All rights reserved.<BR>\r
18b144ea	5	This program and the accompanying materials\r
	6	are licensed and made available under the terms and conditions of the BSD License\r
	7	which accompanies this distribution. The full text of the license may be found at\r
	8	http://opensource.org/licenses/bsd-license.php.\r
	9	\r
	10	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	11	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	12	\r
	13	**/\r
	14	\r
	15	#include <Base.h>\r
	16	\r
	17	#include <Library/DebugCommunicationLib.h>\r
	18	#include <Library/SerialPortLib.h>\r
	19	#include <Library/TimerLib.h>\r
e2104834	20	#include <Library/DebugLib.h>\r
b422b62c	21	#include <Library/BaseLib.h>\r
	22	#include <Library/BaseMemoryLib.h>\r
	23	\r
	24	#pragma pack(1)\r
	25	//\r
	26	// The internal data structure of DEBUG_PORT_HANDLE, which stores some\r
	27	// important datum which are used across various phases.\r
	28	//\r
	29	typedef struct _SERIAL_DEBUG_PORT_HANDLE{\r
	30	//\r
	31	// Timter settings\r
	32	//\r
	33	UINT64 TimerFrequency;\r
	34	UINT64 TimerCycle;\r
	35	BOOLEAN TimerCountDown;\r
	36	} SERIAL_DEBUG_PORT_HANDLE;\r
	37	#pragma pack()\r
	38	\r
	39	//\r
	40	// The global variable which can be used after memory is ready.\r
	41	//\r
	42	SERIAL_DEBUG_PORT_HANDLE mSerialDebugPortHandle;\r
	43	\r
	44	/**\r
	45	Check if the timer is timeout.\r
	46	\r
	47	@param[in] SerialDebugPortHandle Pointer to Serial Debug port handle\r
	48	@param[in] Timer The start timer from the begin.\r
	49	@param[in] TimeoutTicker Ticker number need time out.\r
	50	\r
	51	@return TRUE Timer time out occurs.\r
	52	@retval FALSE Timer does not time out.\r
	53	\r
	54	**/\r
	55	BOOLEAN\r
	56	IsTimerTimeout (\r
	57	IN SERIAL_DEBUG_PORT_HANDLE *SerialDebugPortHandle,\r
	58	IN UINT64 Timer,\r
	59	IN UINT64 TimeoutTicker\r
	60	)\r
	61	{\r
	62	UINT64 CurrentTimer;\r
	63	UINT64 Delta;\r
	64	\r
	65	CurrentTimer = GetPerformanceCounter ();\r
	66	\r
	67	if (SerialDebugPortHandle->TimerCountDown) {\r
	68	//\r
	69	// The timer counter counts down. Check for roll over condition.\r
	70	//\r
	71	if (CurrentTimer < Timer) {\r
	72	Delta = Timer - CurrentTimer;\r
	73	} else {\r
	74	//\r
	75	// Handle one roll-over. \r
	76	//\r
	77	Delta = SerialDebugPortHandle->TimerCycle - (CurrentTimer - Timer);\r
	78	}\r
	79	} else {\r
	80	//\r
	81	// The timer counter counts up. Check for roll over condition.\r
	82	//\r
	83	if (CurrentTimer > Timer) {\r
	84	Delta = CurrentTimer - Timer;\r
85	} else {\r
86	//\r
87	// Handle one roll-over. \r
88	//\r
89	Delta = SerialDebugPortHandle->TimerCycle - (Timer - CurrentTimer);\r
90	}\r
91	}\r
92	\r
93	return (BOOLEAN) (Delta >= TimeoutTicker);\r
94	}\r
18b144ea	95	\r
	96	/**\r
	97	Initialize the debug port.\r
	98	\r
	99	This function will initialize debug port to get it ready for data transmition. If\r
	100	certain Debug Communication Library instance has to save some private data in the\r
	101	stack, this function must work on the mode that doesn't return to the caller, then\r
	102	the caller needs to wrap up all rest of logic after DebugPortInitialize() into one\r
	103	function and pass it into DebugPortInitialize(). DebugPortInitialize() is\r
	104	responsible to invoke the passing-in funciton at the end of DebugPortInitialize().\r
	105	\r
	106	If the paramter Function is not NULL, Debug Communication Libary instance will\r
	107	invoke it by passing in the Context to be the first parameter. Debug Communication\r
	108	Library instance could create one debug port handle to be the second parameter\r
	109	passing into the Function. Debug Communication Library instance also could pass\r
	110	NULL to be the second parameter if it doesn't create the debug port handle.\r
	111	\r
	112	If the parameter Function is NULL, and Context is not NULL. At this time, Context\r
	113	is the debug port handle created by the previous Debug Communication Library\r
	114	instance.\r
	115	a) If the instance can understand and continue use the private data of the previous\r
	116	instance, it could return the same handle as passed in (as Context parameter).\r
	117	b) If the instance does not understand, or does not want to continue use the\r
	118	private data of the previous instance, it could ignore the input Context parameter\r
f95e6f6b	119	and create the new handle to be returned.\r
18b144ea	120	\r
	121	If Function() is NULL and Context is NULL, Debug Communication Library could create a\r
	122	new handle and return it. NULL is also a valid handle to be returned.\r
	123	\r
	124	@param[in] Context Context needed by callback function; it was optional.\r
	125	@param[in] Function Continue function called by Debug Communication library;\r
	126	it was optional.\r
	127	\r
	128	@return The debug port handle created by Debug Communication Library if Function\r
	129	is not NULL.\r
	130	\r
	131	**/\r
	132	DEBUG_PORT_HANDLE\r
	133	EFIAPI\r
	134	DebugPortInitialize (\r
	135	IN VOID *Context,\r
	136	IN DEBUG_PORT_CONTINUE Function\r
	137	)\r
	138	{\r
b422b62c	139	RETURN_STATUS Status;\r
	140	SERIAL_DEBUG_PORT_HANDLE Handle;\r
	141	SERIAL_DEBUG_PORT_HANDLE *SerialDebugPortHandle;\r
	142	UINT64 TimerStartValue;\r
	143	UINT64 TimerEndValue;\r
	144	\r
	145	//\r
	146	// Validate the PCD PcdDebugPortHandleBufferSize value \r
	147	//\r
	148	ASSERT (PcdGet16 (PcdDebugPortHandleBufferSize) == sizeof (SERIAL_DEBUG_PORT_HANDLE));\r
	149	\r
	150	if (Context != NULL && Function == NULL) {\r
	151	SerialDebugPortHandle = (SERIAL_DEBUG_PORT_HANDLE *)Context;\r
	152	} else {\r
	153	ZeroMem (&Handle, sizeof (SERIAL_DEBUG_PORT_HANDLE));\r
	154	SerialDebugPortHandle = &Handle;\r
	155	}\r
	156	SerialDebugPortHandle->TimerFrequency = GetPerformanceCounterProperties (\r
	157	&TimerStartValue,\r
	158	&TimerEndValue\r
	159	);\r
	160	DEBUG ((EFI_D_INFO, "Serial Debug Port: TimerFrequency = 0x%lx\n", SerialDebugPortHandle->TimerFrequency)); \r
	161	DEBUG ((EFI_D_INFO, "Serial Debug Port: TimerStartValue = 0x%lx\n", TimerStartValue)); \r
	162	DEBUG ((EFI_D_INFO, "Serial Debug Port: TimerEndValue = 0x%lx\n", TimerEndValue)); \r
	163	\r
	164	if (TimerEndValue < TimerStartValue) {\r
	165	SerialDebugPortHandle->TimerCountDown = TRUE;\r
	166	SerialDebugPortHandle->TimerCycle = TimerStartValue - TimerEndValue;\r
	167	} else {\r
	168	SerialDebugPortHandle->TimerCountDown = FALSE;\r
	169	SerialDebugPortHandle->TimerCycle = TimerEndValue - TimerStartValue;\r
	170	} \r
	171	\r
	172	if (Function == NULL && Context != NULL) {\r
	173	return (DEBUG_PORT_HANDLE *) Context;\r
	174	}\r
e2104834	175	\r
	176	Status = SerialPortInitialize ();\r
	177	if (RETURN_ERROR(Status)) {\r
	178	DEBUG ((EFI_D_ERROR, "Debug Serial Port: Initialization failed!\n")); \r
	179	}\r
18b144ea	180	\r
18b144ea	181	if (Function != NULL) {\r
b422b62c	182	Function (Context, SerialDebugPortHandle);\r
	183	} else {\r
	184	CopyMem(&mSerialDebugPortHandle, SerialDebugPortHandle, sizeof (SERIAL_DEBUG_PORT_HANDLE));\r
18b144ea	185	}\r
18b144ea	186	\r
b422b62c	187	return (DEBUG_PORT_HANDLE)(UINTN)&mSerialDebugPortHandle;\r
18b144ea	188	}\r
	189	\r
	190	/**\r
	191	Read data from debug device and save the datas in buffer.\r
	192	\r
	193	Reads NumberOfBytes data bytes from a debug device into the buffer\r
	194	specified by Buffer. The number of bytes actually read is returned.\r
	195	If the return value is less than NumberOfBytes, then the rest operation failed.\r
	196	If NumberOfBytes is zero, then return 0.\r
	197	\r
	198	@param Handle Debug port handle.\r
	199	@param Buffer Pointer to the data buffer to store the data read from the debug device.\r
	200	@param NumberOfBytes Number of bytes which will be read.\r
	201	@param Timeout Timeout value for reading from debug device. It unit is Microsecond.\r
	202	\r
	203	@retval 0 Read data failed, no data is to be read.\r
	204	@retval >0 Actual number of bytes read from debug device.\r
	205	\r
	206	**/\r
	207	UINTN\r
	208	EFIAPI\r
	209	DebugPortReadBuffer (\r
	210	IN DEBUG_PORT_HANDLE Handle,\r
	211	IN UINT8 *Buffer,\r
	212	IN UINTN NumberOfBytes,\r
	213	IN UINTN Timeout\r
	214	)\r
	215	{\r
b422b62c	216	SERIAL_DEBUG_PORT_HANDLE *SerialDebugPortHandle;\r
	217	UINTN Index;\r
	218	UINT64 Begin;\r
	219	UINT64 TimeoutTicker;\r
	220	UINT64 TimerRound;\r
	221	\r
	222	//\r
	223	// If Handle is NULL, it means memory is ready for use.\r
	224	// Use global variable to store handle value.\r
	225	//\r
	226	if (Handle == NULL) {\r
	227	SerialDebugPortHandle = &mSerialDebugPortHandle;\r
	228	} else {\r
	229	SerialDebugPortHandle = (SERIAL_DEBUG_PORT_HANDLE *)Handle;\r
	230	}\r
	231	\r
	232	Begin = 0;\r
	233	TimeoutTicker = 0; \r
	234	TimerRound = 0;\r
	235	if (Timeout != 0) {\r
	236	Begin = GetPerformanceCounter ();\r
	237	TimeoutTicker = DivU64x32 (\r
	238	MultU64x64 (\r
	239	SerialDebugPortHandle->TimerFrequency,\r
	240	Timeout\r
	241	),\r
	242	1000000u\r
	243	);\r
	244	TimerRound = DivU64x64Remainder (\r
	245	TimeoutTicker,\r
	246	DivU64x32 (SerialDebugPortHandle->TimerCycle, 2),\r
	247	&TimeoutTicker\r
	248	);\r
	249	}\r
	250	Index = 0;\r
	251	while (Index < NumberOfBytes) {\r
	252	if (SerialPortPoll () \|\| Timeout == 0) {\r
	253	SerialPortRead (Buffer + Index, 1);\r
	254	Index ++; \r
	255	continue;\r
	256	}\r
	257	if (TimerRound == 0) {\r
	258	if (IsTimerTimeout (SerialDebugPortHandle, Begin, TimeoutTicker)) {\r
	259	//\r
	260	// If time out occurs.\r
	261	//\r
18b144ea	262	return 0;\r
18b144ea	263	}\r
b422b62c	264	} else {\r
	265	if (IsTimerTimeout (SerialDebugPortHandle, Begin, DivU64x32 (SerialDebugPortHandle->TimerCycle, 2))) {\r
	266	TimerRound --;\r
	267	}\r
18b144ea	268	}\r
	269	}\r
	270	\r
b422b62c	271	return Index;\r
18b144ea	272	}\r
	273	\r
	274	/**\r
	275	Write data from buffer to debug device.\r
	276	\r
	277	Writes NumberOfBytes data bytes from Buffer to the debug device.\r
	278	The number of bytes actually written to the debug device is returned.\r
	279	If the return value is less than NumberOfBytes, then the write operation failed.\r
	280	If NumberOfBytes is zero, then return 0.\r
	281	\r
	282	@param Handle Debug port handle.\r
	283	@param Buffer Pointer to the data buffer to be written.\r
	284	@param NumberOfBytes Number of bytes to written to the debug device.\r
	285	\r
	286	@retval 0 NumberOfBytes is 0.\r
	287	@retval >0 The number of bytes written to the debug device.\r
	288	If this value is less than NumberOfBytes, then the read operation failed.\r
	289	\r
	290	**/\r
	291	UINTN\r
	292	EFIAPI\r
	293	DebugPortWriteBuffer (\r
	294	IN DEBUG_PORT_HANDLE Handle,\r
	295	IN UINT8 *Buffer,\r
	296	IN UINTN NumberOfBytes\r
	297	)\r
	298	{\r
	299	return SerialPortWrite (Buffer, NumberOfBytes);\r
	300	}\r
	301	\r
	302	/**\r
	303	Polls a debug device to see if there is any data waiting to be read.\r
	304	\r
	305	Polls a debug device to see if there is any data waiting to be read.\r
	306	If there is data waiting to be read from the debug device, then TRUE is returned.\r
	307	If there is no data waiting to be read from the debug device, then FALSE is returned.\r
	308	\r
	309	@param Handle Debug port handle.\r
	310	\r
	311	@retval TRUE Data is waiting to be read from the debug device.\r
	312	@retval FALSE There is no data waiting to be read from the serial device.\r
	313	\r
	314	**/\r
	315	BOOLEAN\r
	316	EFIAPI\r
	317	DebugPortPollBuffer (\r
	318	IN DEBUG_PORT_HANDLE Handle\r
	319	)\r
	320	{\r
	321	return SerialPortPoll ();\r
	322	}\r
	323	\r