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6022e28c
JJ		 1/** @file\r
2 CPU DXE MP support\r
3\r
39d49a73 4 Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>\r
6022e28c
JJ		 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#ifndef _CPU_MP_H_\r
16#define _CPU_MP_H_\r
17\r
18/**\r
19 Initialize Multi-processor support.\r
20\r
21**/\r
22VOID\r
23InitializeMpSupport (\r
24 VOID\r
25 );\r
26\r
d894d8b7
CF		 27/**\r
28 This service retrieves the number of logical processor in the platform\r
29 and the number of those logical processors that are enabled on this boot.\r
30 This service may only be called from the BSP.\r
31\r
32 This function is used to retrieve the following information:\r
33 - The number of logical processors that are present in the system.\r
34 - The number of enabled logical processors in the system at the instant\r
35 this call is made.\r
36\r
37 Because MP Service Protocol provides services to enable and disable processors\r
38 dynamically, the number of enabled logical processors may vary during the\r
39 course of a boot session.\r
40\r
41 If this service is called from an AP, then EFI_DEVICE_ERROR is returned.\r
42 If NumberOfProcessors or NumberOfEnabledProcessors is NULL, then\r
43 EFI_INVALID_PARAMETER is returned. Otherwise, the total number of processors\r
44 is returned in NumberOfProcessors, the number of currently enabled processor\r
45 is returned in NumberOfEnabledProcessors, and EFI_SUCCESS is returned.\r
46\r
47 @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL\r
48 instance.\r
49 @param[out] NumberOfProcessors Pointer to the total number of logical\r
50 processors in the system, including the BSP\r
51 and disabled APs.\r
52 @param[out] NumberOfEnabledProcessors Pointer to the number of enabled logical\r
53 processors that exist in system, including\r
54 the BSP.\r
55\r
56 @retval EFI_SUCCESS The number of logical processors and enabled\r
57 logical processors was retrieved.\r
58 @retval EFI_DEVICE_ERROR The calling processor is an AP.\r
59 @retval EFI_INVALID_PARAMETER NumberOfProcessors is NULL.\r
60 @retval EFI_INVALID_PARAMETER NumberOfEnabledProcessors is NULL.\r
61\r
62**/\r
63EFI_STATUS\r
64EFIAPI\r
65GetNumberOfProcessors (\r
66 IN EFI_MP_SERVICES_PROTOCOL *This,\r
67 OUT UINTN *NumberOfProcessors,\r
68 OUT UINTN *NumberOfEnabledProcessors\r
69 );\r
70\r
e7938b5a
CF		 71/**\r
72 Gets detailed MP-related information on the requested processor at the\r
73 instant this call is made. This service may only be called from the BSP.\r
74\r
75 This service retrieves detailed MP-related information about any processor\r
76 on the platform. Note the following:\r
77 - The processor information may change during the course of a boot session.\r
78 - The information presented here is entirely MP related.\r
79\r
80 Information regarding the number of caches and their sizes, frequency of operation,\r
81 slot numbers is all considered platform-related information and is not provided\r
82 by this service.\r
83\r
84 @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL\r
85 instance.\r
86 @param[in] ProcessorNumber The handle number of processor.\r
87 @param[out] ProcessorInfoBuffer A pointer to the buffer where information for\r
88 the requested processor is deposited.\r
89\r
90 @retval EFI_SUCCESS Processor information was returned.\r
91 @retval EFI_DEVICE_ERROR The calling processor is an AP.\r
92 @retval EFI_INVALID_PARAMETER ProcessorInfoBuffer is NULL.\r
93 @retval EFI_NOT_FOUND The processor with the handle specified by\r
94 ProcessorNumber does not exist in the platform.\r
95\r
96**/\r
97EFI_STATUS\r
98EFIAPI\r
99GetProcessorInfo (\r
100 IN EFI_MP_SERVICES_PROTOCOL *This,\r
101 IN UINTN ProcessorNumber,\r
102 OUT EFI_PROCESSOR_INFORMATION *ProcessorInfoBuffer\r
103 );\r
104\r
5fee172f
CF		 105/**\r
106 This service executes a caller provided function on all enabled APs. APs can\r
107 run either simultaneously or one at a time in sequence. This service supports\r
108 both blocking and non-blocking requests. The non-blocking requests use EFI\r
109 events so the BSP can detect when the APs have finished. This service may only\r
110 be called from the BSP.\r
111\r
112 This function is used to dispatch all the enabled APs to the function specified\r
113 by Procedure. If any enabled AP is busy, then EFI_NOT_READY is returned\r
114 immediately and Procedure is not started on any AP.\r
115\r
116 If SingleThread is TRUE, all the enabled APs execute the function specified by\r
117 Procedure one by one, in ascending order of processor handle number. Otherwise,\r
118 all the enabled APs execute the function specified by Procedure simultaneously.\r
119\r
120 If WaitEvent is NULL, execution is in blocking mode. The BSP waits until all\r
121 APs finish or TimeoutInMicroseconds expires. Otherwise, execution is in non-blocking\r
122 mode, and the BSP returns from this service without waiting for APs. If a\r
123 non-blocking mode is requested after the UEFI Event EFI_EVENT_GROUP_READY_TO_BOOT\r
124 is signaled, then EFI_UNSUPPORTED must be returned.\r
125\r
126 If the timeout specified by TimeoutInMicroseconds expires before all APs return\r
127 from Procedure, then Procedure on the failed APs is terminated. All enabled APs\r
128 are always available for further calls to EFI_MP_SERVICES_PROTOCOL.StartupAllAPs()\r
129 and EFI_MP_SERVICES_PROTOCOL.StartupThisAP(). If FailedCpuList is not NULL, its\r
130 content points to the list of processor handle numbers in which Procedure was\r
131 terminated.\r
132\r
133 Note: It is the responsibility of the consumer of the EFI_MP_SERVICES_PROTOCOL.StartupAllAPs()\r
134 to make sure that the nature of the code that is executed on the BSP and the\r
135 dispatched APs is well controlled. The MP Services Protocol does not guarantee\r
136 that the Procedure function is MP-safe. Hence, the tasks that can be run in\r
137 parallel are limited to certain independent tasks and well-controlled exclusive\r
138 code. EFI services and protocols may not be called by APs unless otherwise\r
139 specified.\r
140\r
141 In blocking execution mode, BSP waits until all APs finish or\r
142 TimeoutInMicroseconds expires.\r
143\r
144 In non-blocking execution mode, BSP is freed to return to the caller and then\r
145 proceed to the next task without having to wait for APs. The following\r
146 sequence needs to occur in a non-blocking execution mode:\r
147\r
148 -# The caller that intends to use this MP Services Protocol in non-blocking\r
149 mode creates WaitEvent by calling the EFI CreateEvent() service. The caller\r
150 invokes EFI_MP_SERVICES_PROTOCOL.StartupAllAPs(). If the parameter WaitEvent\r
151 is not NULL, then StartupAllAPs() executes in non-blocking mode. It requests\r
152 the function specified by Procedure to be started on all the enabled APs,\r
153 and releases the BSP to continue with other tasks.\r
154 -# The caller can use the CheckEvent() and WaitForEvent() services to check\r
155 the state of the WaitEvent created in step 1.\r
156 -# When the APs complete their task or TimeoutInMicroSecondss expires, the MP\r
157 Service signals WaitEvent by calling the EFI SignalEvent() function. If\r
158 FailedCpuList is not NULL, its content is available when WaitEvent is\r
159 signaled. If all APs returned from Procedure prior to the timeout, then\r
160 FailedCpuList is set to NULL. If not all APs return from Procedure before\r
161 the timeout, then FailedCpuList is filled in with the list of the failed\r
162 APs. The buffer is allocated by MP Service Protocol using AllocatePool().\r
163 It is the caller's responsibility to free the buffer with FreePool() service.\r
164 -# This invocation of SignalEvent() function informs the caller that invoked\r
165 EFI_MP_SERVICES_PROTOCOL.StartupAllAPs() that either all the APs completed\r
166 the specified task or a timeout occurred. The contents of FailedCpuList\r
167 can be examined to determine which APs did not complete the specified task\r
168 prior to the timeout.\r
169\r
170 @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL\r
171 instance.\r
172 @param[in] Procedure A pointer to the function to be run on\r
173 enabled APs of the system. See type\r
174 EFI_AP_PROCEDURE.\r
175 @param[in] SingleThread If TRUE, then all the enabled APs execute\r
176 the function specified by Procedure one by\r
177 one, in ascending order of processor handle\r
178 number. If FALSE, then all the enabled APs\r
179 execute the function specified by Procedure\r
180 simultaneously.\r
181 @param[in] WaitEvent The event created by the caller with CreateEvent()\r
182 service. If it is NULL, then execute in\r
183 blocking mode. BSP waits until all APs finish\r
184 or TimeoutInMicroseconds expires. If it's\r
185 not NULL, then execute in non-blocking mode.\r
186 BSP requests the function specified by\r
187 Procedure to be started on all the enabled\r
188 APs, and go on executing immediately. If\r
189 all return from Procedure, or TimeoutInMicroseconds\r
190 expires, this event is signaled. The BSP\r
191 can use the CheckEvent() or WaitForEvent()\r
192 services to check the state of event. Type\r
193 EFI_EVENT is defined in CreateEvent() in\r
194 the Unified Extensible Firmware Interface\r
195 Specification.\r
196 @param[in] TimeoutInMicroseconds Indicates the time limit in microseconds for\r
197 APs to return from Procedure, either for\r
198 blocking or non-blocking mode. Zero means\r
199 infinity. If the timeout expires before\r
200 all APs return from Procedure, then Procedure\r
201 on the failed APs is terminated. All enabled\r
202 APs are available for next function assigned\r
203 by EFI_MP_SERVICES_PROTOCOL.StartupAllAPs()\r
204 or EFI_MP_SERVICES_PROTOCOL.StartupThisAP().\r
205 If the timeout expires in blocking mode,\r
206 BSP returns EFI_TIMEOUT. If the timeout\r
207 expires in non-blocking mode, WaitEvent\r
208 is signaled with SignalEvent().\r
209 @param[in] ProcedureArgument The parameter passed into Procedure for\r
210 all APs.\r
211 @param[out] FailedCpuList If NULL, this parameter is ignored. Otherwise,\r
212 if all APs finish successfully, then its\r
213 content is set to NULL. If not all APs\r
214 finish before timeout expires, then its\r
215 content is set to address of the buffer\r
216 holding handle numbers of the failed APs.\r
217 The buffer is allocated by MP Service Protocol,\r
218 and it's the caller's responsibility to\r
219 free the buffer with FreePool() service.\r
220 In blocking mode, it is ready for consumption\r
221 when the call returns. In non-blocking mode,\r
222 it is ready when WaitEvent is signaled. The\r
223 list of failed CPU is terminated by\r
224 END_OF_CPU_LIST.\r
225\r
226 @retval EFI_SUCCESS In blocking mode, all APs have finished before\r
227 the timeout expired.\r
228 @retval EFI_SUCCESS In non-blocking mode, function has been dispatched\r
229 to all enabled APs.\r
230 @retval EFI_UNSUPPORTED A non-blocking mode request was made after the\r
231 UEFI event EFI_EVENT_GROUP_READY_TO_BOOT was\r
232 signaled.\r
233 @retval EFI_DEVICE_ERROR Caller processor is AP.\r
234 @retval EFI_NOT_STARTED No enabled APs exist in the system.\r
235 @retval EFI_NOT_READY Any enabled APs are busy.\r
236 @retval EFI_TIMEOUT In blocking mode, the timeout expired before\r
237 all enabled APs have finished.\r
238 @retval EFI_INVALID_PARAMETER Procedure is NULL.\r
239\r
240**/\r
241EFI_STATUS\r
242EFIAPI\r
243StartupAllAPs (\r
244 IN EFI_MP_SERVICES_PROTOCOL *This,\r
245 IN EFI_AP_PROCEDURE Procedure,\r
246 IN BOOLEAN SingleThread,\r
247 IN EFI_EVENT WaitEvent OPTIONAL,\r
248 IN UINTN TimeoutInMicroseconds,\r
249 IN VOID *ProcedureArgument OPTIONAL,\r
250 OUT UINTN **FailedCpuList OPTIONAL\r
251 );\r
252\r
3f4f0af8
CF		 253/**\r
254 This service lets the caller get one enabled AP to execute a caller-provided\r
255 function. The caller can request the BSP to either wait for the completion\r
256 of the AP or just proceed with the next task by using the EFI event mechanism.\r
257 See EFI_MP_SERVICES_PROTOCOL.StartupAllAPs() for more details on non-blocking\r
258 execution support. This service may only be called from the BSP.\r
259\r
260 This function is used to dispatch one enabled AP to the function specified by\r
261 Procedure passing in the argument specified by ProcedureArgument. If WaitEvent\r
262 is NULL, execution is in blocking mode. The BSP waits until the AP finishes or\r
263 TimeoutInMicroSecondss expires. Otherwise, execution is in non-blocking mode.\r
264 BSP proceeds to the next task without waiting for the AP. If a non-blocking mode\r
265 is requested after the UEFI Event EFI_EVENT_GROUP_READY_TO_BOOT is signaled,\r
266 then EFI_UNSUPPORTED must be returned.\r
267\r
268 If the timeout specified by TimeoutInMicroseconds expires before the AP returns\r
269 from Procedure, then execution of Procedure by the AP is terminated. The AP is\r
270 available for subsequent calls to EFI_MP_SERVICES_PROTOCOL.StartupAllAPs() and\r
271 EFI_MP_SERVICES_PROTOCOL.StartupThisAP().\r
272\r
273 @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL\r
274 instance.\r
275 @param[in] Procedure A pointer to the function to be run on\r
276 enabled APs of the system. See type\r
277 EFI_AP_PROCEDURE.\r
278 @param[in] ProcessorNumber The handle number of the AP. The range is\r
279 from 0 to the total number of logical\r
280 processors minus 1. The total number of\r
281 logical processors can be retrieved by\r
282 EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors().\r
283 @param[in] WaitEvent The event created by the caller with CreateEvent()\r
284 service. If it is NULL, then execute in\r
285 blocking mode. BSP waits until all APs finish\r
286 or TimeoutInMicroseconds expires. If it's\r
287 not NULL, then execute in non-blocking mode.\r
288 BSP requests the function specified by\r
289 Procedure to be started on all the enabled\r
290 APs, and go on executing immediately. If\r
291 all return from Procedure or TimeoutInMicroseconds\r
292 expires, this event is signaled. The BSP\r
293 can use the CheckEvent() or WaitForEvent()\r
294 services to check the state of event. Type\r
295 EFI_EVENT is defined in CreateEvent() in\r
296 the Unified Extensible Firmware Interface\r
297 Specification.\r
298 @param[in] TimeoutInMicroseconds Indicates the time limit in microseconds for\r
299 APs to return from Procedure, either for\r
300 blocking or non-blocking mode. Zero means\r
301 infinity. If the timeout expires before\r
302 all APs return from Procedure, then Procedure\r
303 on the failed APs is terminated. All enabled\r
304 APs are available for next function assigned\r
305 by EFI_MP_SERVICES_PROTOCOL.StartupAllAPs()\r
306 or EFI_MP_SERVICES_PROTOCOL.StartupThisAP().\r
307 If the timeout expires in blocking mode,\r
308 BSP returns EFI_TIMEOUT. If the timeout\r
309 expires in non-blocking mode, WaitEvent\r
310 is signaled with SignalEvent().\r
311 @param[in] ProcedureArgument The parameter passed into Procedure for\r
312 all APs.\r
313 @param[out] Finished If NULL, this parameter is ignored. In\r
314 blocking mode, this parameter is ignored.\r
315 In non-blocking mode, if AP returns from\r
316 Procedure before the timeout expires, its\r
317 content is set to TRUE. Otherwise, the\r
318 value is set to FALSE. The caller can\r
319 determine if the AP returned from Procedure\r
320 by evaluating this value.\r
321\r
322 @retval EFI_SUCCESS In blocking mode, specified AP finished before\r
323 the timeout expires.\r
324 @retval EFI_SUCCESS In non-blocking mode, the function has been\r
325 dispatched to specified AP.\r
326 @retval EFI_UNSUPPORTED A non-blocking mode request was made after the\r
327 UEFI event EFI_EVENT_GROUP_READY_TO_BOOT was\r
328 signaled.\r
329 @retval EFI_DEVICE_ERROR The calling processor is an AP.\r
330 @retval EFI_TIMEOUT In blocking mode, the timeout expired before\r
331 the specified AP has finished.\r
332 @retval EFI_NOT_READY The specified AP is busy.\r
333 @retval EFI_NOT_FOUND The processor with the handle specified by\r
334 ProcessorNumber does not exist.\r
335 @retval EFI_INVALID_PARAMETER ProcessorNumber specifies the BSP or disabled AP.\r
336 @retval EFI_INVALID_PARAMETER Procedure is NULL.\r
337\r
338**/\r
339EFI_STATUS\r
340EFIAPI\r
341StartupThisAP (\r
342 IN EFI_MP_SERVICES_PROTOCOL *This,\r
343 IN EFI_AP_PROCEDURE Procedure,\r
344 IN UINTN ProcessorNumber,\r
345 IN EFI_EVENT WaitEvent OPTIONAL,\r
346 IN UINTN TimeoutInMicroseconds,\r
347 IN VOID *ProcedureArgument OPTIONAL,\r
348 OUT BOOLEAN *Finished OPTIONAL\r
349 );\r
350\r
b7c05ba5
CF		 351/**\r
352 This service switches the requested AP to be the BSP from that point onward.\r
353 This service changes the BSP for all purposes. This call can only be performed\r
354 by the current BSP.\r
355\r
356 This service switches the requested AP to be the BSP from that point onward.\r
357 This service changes the BSP for all purposes. The new BSP can take over the\r
358 execution of the old BSP and continue seamlessly from where the old one left\r
359 off. This service may not be supported after the UEFI Event EFI_EVENT_GROUP_READY_TO_BOOT\r
360 is signaled.\r
361\r
362 If the BSP cannot be switched prior to the return from this service, then\r
363 EFI_UNSUPPORTED must be returned.\r
364\r
365 @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL instance.\r
366 @param[in] ProcessorNumber The handle number of AP that is to become the new\r
367 BSP. The range is from 0 to the total number of\r
368 logical processors minus 1. The total number of\r
369 logical processors can be retrieved by\r
370 EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors().\r
371 @param[in] EnableOldBSP If TRUE, then the old BSP will be listed as an\r
372 enabled AP. Otherwise, it will be disabled.\r
373\r
374 @retval EFI_SUCCESS BSP successfully switched.\r
375 @retval EFI_UNSUPPORTED Switching the BSP cannot be completed prior to\r
376 this service returning.\r
377 @retval EFI_UNSUPPORTED Switching the BSP is not supported.\r
29b237f8 378 @retval EFI_DEVICE_ERROR The calling processor is an AP.\r
b7c05ba5
CF		 379 @retval EFI_NOT_FOUND The processor with the handle specified by\r
380 ProcessorNumber does not exist.\r
381 @retval EFI_INVALID_PARAMETER ProcessorNumber specifies the current BSP or\r
382 a disabled AP.\r
383 @retval EFI_NOT_READY The specified AP is busy.\r
384\r
385**/\r
386EFI_STATUS\r
387EFIAPI\r
388SwitchBSP (\r
389 IN EFI_MP_SERVICES_PROTOCOL *This,\r
390 IN UINTN ProcessorNumber,\r
391 IN BOOLEAN EnableOldBSP\r
392 );\r
393\r
fa7ce675
CF		 394/**\r
395 This service lets the caller enable or disable an AP from this point onward.\r
396 This service may only be called from the BSP.\r
397\r
398 This service allows the caller enable or disable an AP from this point onward.\r
399 The caller can optionally specify the health status of the AP by Health. If\r
400 an AP is being disabled, then the state of the disabled AP is implementation\r
401 dependent. If an AP is enabled, then the implementation must guarantee that a\r
402 complete initialization sequence is performed on the AP, so the AP is in a state\r
403 that is compatible with an MP operating system. This service may not be supported\r
404 after the UEFI Event EFI_EVENT_GROUP_READY_TO_BOOT is signaled.\r
405\r
406 If the enable or disable AP operation cannot be completed prior to the return\r
407 from this service, then EFI_UNSUPPORTED must be returned.\r
408\r
409 @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL instance.\r
410 @param[in] ProcessorNumber The handle number of AP that is to become the new\r
411 BSP. The range is from 0 to the total number of\r
412 logical processors minus 1. The total number of\r
413 logical processors can be retrieved by\r
414 EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors().\r
415 @param[in] EnableAP Specifies the new state for the processor for\r
416 enabled, FALSE for disabled.\r
417 @param[in] HealthFlag If not NULL, a pointer to a value that specifies\r
418 the new health status of the AP. This flag\r
419 corresponds to StatusFlag defined in\r
420 EFI_MP_SERVICES_PROTOCOL.GetProcessorInfo(). Only\r
421 the PROCESSOR_HEALTH_STATUS_BIT is used. All other\r
422 bits are ignored. If it is NULL, this parameter\r
423 is ignored.\r
424\r
425 @retval EFI_SUCCESS The specified AP was enabled or disabled successfully.\r
426 @retval EFI_UNSUPPORTED Enabling or disabling an AP cannot be completed\r
427 prior to this service returning.\r
428 @retval EFI_UNSUPPORTED Enabling or disabling an AP is not supported.\r
429 @retval EFI_DEVICE_ERROR The calling processor is an AP.\r
430 @retval EFI_NOT_FOUND Processor with the handle specified by ProcessorNumber\r
431 does not exist.\r
432 @retval EFI_INVALID_PARAMETER ProcessorNumber specifies the BSP.\r
433\r
434**/\r
435EFI_STATUS\r
436EFIAPI\r
437EnableDisableAP (\r
438 IN EFI_MP_SERVICES_PROTOCOL *This,\r
439 IN UINTN ProcessorNumber,\r
440 IN BOOLEAN EnableAP,\r
441 IN UINT32 *HealthFlag OPTIONAL\r
442 );\r
443\r
cfa2fac1
CF		 444/**\r
445 This return the handle number for the calling processor. This service may be\r
446 called from the BSP and APs.\r
447\r
448 This service returns the processor handle number for the calling processor.\r
449 The returned value is in the range from 0 to the total number of logical\r
450 processors minus 1. The total number of logical processors can be retrieved\r
451 with EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors(). This service may be\r
452 called from the BSP and APs. If ProcessorNumber is NULL, then EFI_INVALID_PARAMETER\r
453 is returned. Otherwise, the current processors handle number is returned in\r
454 ProcessorNumber, and EFI_SUCCESS is returned.\r
455\r
456 @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL instance.\r
457 @param[out] ProcessorNumber The handle number of AP that is to become the new\r
458 BSP. The range is from 0 to the total number of\r
459 logical processors minus 1. The total number of\r
460 logical processors can be retrieved by\r
461 EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors().\r
462\r
463 @retval EFI_SUCCESS The current processor handle number was returned\r
464 in ProcessorNumber.\r
465 @retval EFI_INVALID_PARAMETER ProcessorNumber is NULL.\r
466\r
467**/\r
468EFI_STATUS\r
469EFIAPI\r
470WhoAmI (\r
471 IN EFI_MP_SERVICES_PROTOCOL *This,\r
472 OUT UINTN *ProcessorNumber\r
473 );\r
474\r
6022e28c
JJ		 475#endif // _CPU_MP_H_\r
476\r
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