IOMAll.cpp@ 92561

Last change on this file since 92561 was 90426, checked in by vboxsync, 3 years ago
IOM: Be more careful checking the status of IOM_LOCK_SHARED(). bugref:6695
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1	/* $Id: IOMAll.cpp 90426 2021-07-30 13:22:04Z vboxsync $ */
2	/** @file
3	* IOM - Input / Output Monitor - Any Context.
4	*/
5
6	/*
7	* Copyright (C) 2006-2020 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/*********************************************************************************************************************************
20	* Header Files *
21	*********************************************************************************************************************************/
22	#define LOG_GROUP LOG_GROUP_IOM_IOPORT
23	#include <VBox/vmm/iom.h>
24	#include <VBox/vmm/mm.h>
25	#include <VBox/param.h>
26	#include "IOMInternal.h"
27	#include <VBox/vmm/vmcc.h>
28	#include <VBox/vmm/vmm.h>
29	#include <VBox/vmm/selm.h>
30	#include <VBox/vmm/trpm.h>
31	#include <VBox/vmm/pdmdev.h>
32	#include <VBox/vmm/pgm.h>
33	#include <VBox/vmm/cpum.h>
34	#include <VBox/err.h>
35	#include <VBox/log.h>
36	#include <iprt/assert.h>
37	#include <iprt/string.h>
38	#include "IOMInline.h"
39
40
41	/**
42	* Reads an I/O port register.
43	*
44	* @returns Strict VBox status code. Informational status codes other than the one documented
45	* here are to be treated as internal failure. Use IOM_SUCCESS() to check for success.
46	* @retval VINF_SUCCESS Success.
47	* @retval VINF_EM_FIRST-VINF_EM_LAST Success with some exceptions (see IOM_SUCCESS()), the
48	* status code must be passed on to EM.
49	* @retval VINF_IOM_R3_IOPORT_READ Defer the read to ring-3. (R0/RC only)
50	*
51	* @param pVM The cross context VM structure.
52	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
53	* @param Port The port to read.
54	* @param pu32Value Where to store the value read.
55	* @param cbValue The size of the register to read in bytes. 1, 2 or 4 bytes.
56	*/
57	VMMDECL(VBOXSTRICTRC) IOMIOPortRead(PVMCC pVM, PVMCPU pVCpu, RTIOPORT Port, uint32_t *pu32Value, size_t cbValue)
58	{
59	STAM_COUNTER_INC(&pVM->iom.s.StatIoPortIn);
60	Assert(pVCpu->iom.s.PendingIOPortWrite.cbValue == 0);
61
62	/** @todo should initialize *pu32Value here because it can happen that some
63	* handle is buggy and doesn't handle all cases. */
64
65	/* For lookups we need to share lock IOM. */
66	int rc2 = IOM_LOCK_SHARED(pVM);
67	if (RT_SUCCESS(rc2))
68	{ /* likely */ }
69	#ifndef IN_RING3
70	else if (rc2 == VERR_SEM_BUSY)
71	return VINF_IOM_R3_IOPORT_READ;
72	#endif
73	else
74	AssertMsgFailedReturn(("rc2=%Rrc\n", rc2), rc2);
75
76	/*
77	* Get the entry for the current context.
78	*/
79	uint16_t offPort;
80	CTX_SUFF(PIOMIOPORTENTRY) pRegEntry = iomIoPortGetEntry(pVM, Port, &offPort, &pVCpu->iom.s.idxIoPortLastRead);
81	if (pRegEntry)
82	{
83	#ifdef VBOX_WITH_STATISTICS
84	PIOMIOPORTSTATSENTRY pStats = iomIoPortGetStats(pVM, pRegEntry, offPort);
85	#endif
86
87	/*
88	* Found an entry, get the data so we can leave the IOM lock.
89	*/
90	uint16_t const fFlags = pRegEntry->fFlags;
91	PFNIOMIOPORTNEWIN pfnInCallback = pRegEntry->pfnInCallback;
92	PPDMDEVINS pDevIns = pRegEntry->pDevIns;
93	#ifndef IN_RING3
94	if ( pfnInCallback
95	&& pDevIns
96	&& pRegEntry->cPorts > 0)
97	{ /* likely */ }
98	else
99	{
100	STAM_COUNTER_INC(&pStats->InRZToR3);
101	IOM_UNLOCK_SHARED(pVM);
102	return VINF_IOM_R3_IOPORT_READ;
103	}
104	#endif
105	void *pvUser = pRegEntry->pvUser;
106	IOM_UNLOCK_SHARED(pVM);
107	AssertPtr(pDevIns);
108	AssertPtr(pfnInCallback);
109
110	/*
111	* Call the device.
112	*/
113	VBOXSTRICTRC rcStrict = PDMCritSectEnter(pVM, pDevIns->CTX_SUFF(pCritSectRo), VINF_IOM_R3_IOPORT_READ);
114	if (rcStrict == VINF_SUCCESS)
115	{
116	STAM_PROFILE_START(&pStats->CTX_SUFF_Z(ProfIn), a);
117	rcStrict = pfnInCallback(pDevIns, pvUser, fFlags & IOM_IOPORT_F_ABS ? Port : offPort, pu32Value, (unsigned)cbValue);
118	STAM_PROFILE_STOP(&pStats->CTX_SUFF_Z(ProfIn), a);
119	PDMCritSectLeave(pVM, pDevIns->CTX_SUFF(pCritSectRo));
120
121	#ifndef IN_RING3
122	if (rcStrict == VINF_IOM_R3_IOPORT_READ)
123	STAM_COUNTER_INC(&pStats->InRZToR3);
124	else
125	#endif
126	{
127	STAM_COUNTER_INC(&pStats->CTX_SUFF_Z(In));
128	STAM_COUNTER_INC(&iomIoPortGetStats(pVM, pRegEntry, 0)->Total);
129	if (rcStrict == VERR_IOM_IOPORT_UNUSED)
130	{
131	/* make return value */
132	rcStrict = VINF_SUCCESS;
133	switch (cbValue)
134	{
135	case 1: (uint8_t )pu32Value = 0xff; break;
136	case 2: (uint16_t )pu32Value = 0xffff; break;
137	case 4: (uint32_t )pu32Value = UINT32_C(0xffffffff); break;
138	default:
139	AssertMsgFailedReturn(("Invalid I/O port size %d. Port=%d\n", cbValue, Port), VERR_IOM_INVALID_IOPORT_SIZE);
140	}
141	}
142	}
143	Log3(("IOMIOPortRead: Port=%RTiop pu32=%08RX32 cb=%d rc=%Rrc\n", Port, pu32Value, cbValue, VBOXSTRICTRC_VAL(rcStrict)));
144	STAM_COUNTER_INC(&iomIoPortGetStats(pVM, pRegEntry, 0)->Total);
145	}
146	else
147	STAM_COUNTER_INC(&pStats->InRZToR3);
148	return rcStrict;
149	}
150
151	/*
152	* Ok, no handler for this port.
153	*/
154	IOM_UNLOCK_SHARED(pVM);
155	switch (cbValue)
156	{
157	case 1: (uint8_t )pu32Value = 0xff; break;
158	case 2: (uint16_t )pu32Value = 0xffff; break;
159	case 4: (uint32_t )pu32Value = UINT32_C(0xffffffff); break;
160	default:
161	AssertMsgFailedReturn(("Invalid I/O port size %d. Port=%d\n", cbValue, Port), VERR_IOM_INVALID_IOPORT_SIZE);
162	}
163	Log3(("IOMIOPortRead: Port=%RTiop pu32=%08RX32 cb=%d rc=VINF_SUCCESS\n", Port, pu32Value, cbValue));
164	return VINF_SUCCESS;
165	}
166
167
168	/**
169	* Reads the string buffer of an I/O port register.
170	*
171	* @returns Strict VBox status code. Informational status codes other than the one documented
172	* here are to be treated as internal failure. Use IOM_SUCCESS() to check for success.
173	* @retval VINF_SUCCESS Success or no string I/O callback in
174	* this context.
175	* @retval VINF_EM_FIRST-VINF_EM_LAST Success with some exceptions (see IOM_SUCCESS()), the
176	* status code must be passed on to EM.
177	* @retval VINF_IOM_R3_IOPORT_READ Defer the read to ring-3. (R0/RC only)
178	*
179	* @param pVM The cross context VM structure.
180	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
181	* @param uPort The port to read.
182	* @param pvDst Pointer to the destination buffer.
183	* @param pcTransfers Pointer to the number of transfer units to read, on return remaining transfer units.
184	* @param cb Size of the transfer unit (1, 2 or 4 bytes).
185	*/
186	VMM_INT_DECL(VBOXSTRICTRC) IOMIOPortReadString(PVMCC pVM, PVMCPU pVCpu, RTIOPORT uPort,
187	void pvDst, uint32_t pcTransfers, unsigned cb)
188	{
189	STAM_COUNTER_INC(&pVM->iom.s.StatIoPortInS);
190	Assert(pVCpu->iom.s.PendingIOPortWrite.cbValue == 0);
191
192	/* For lookups we need to share lock IOM. */
193	int rc2 = IOM_LOCK_SHARED(pVM);
194	if (RT_SUCCESS(rc2))
195	{ /* likely */ }
196	#ifndef IN_RING3
197	else if (rc2 == VERR_SEM_BUSY)
198	return VINF_IOM_R3_IOPORT_READ;
199	#endif
200	else
201	AssertMsgFailedReturn(("rc2=%Rrc\n", rc2), rc2);
202
203	const uint32_t cRequestedTransfers = *pcTransfers;
204	Assert(cRequestedTransfers > 0);
205
206	/*
207	* Get the entry for the current context.
208	*/
209	uint16_t offPort;
210	CTX_SUFF(PIOMIOPORTENTRY) pRegEntry = iomIoPortGetEntry(pVM, uPort, &offPort, &pVCpu->iom.s.idxIoPortLastReadStr);
211	if (pRegEntry)
212	{
213	#ifdef VBOX_WITH_STATISTICS
214	PIOMIOPORTSTATSENTRY pStats = iomIoPortGetStats(pVM, pRegEntry, offPort);
215	#endif
216
217	/*
218	* Found an entry, get the data so we can leave the IOM lock.
219	*/
220	uint16_t const fFlags = pRegEntry->fFlags;
221	PFNIOMIOPORTNEWINSTRING pfnInStrCallback = pRegEntry->pfnInStrCallback;
222	PFNIOMIOPORTNEWIN pfnInCallback = pRegEntry->pfnInCallback;
223	PPDMDEVINS pDevIns = pRegEntry->pDevIns;
224	#ifndef IN_RING3
225	if ( pfnInCallback
226	&& pDevIns
227	&& pRegEntry->cPorts > 0)
228	{ /* likely */ }
229	else
230	{
231	STAM_COUNTER_INC(&pStats->InRZToR3);
232	IOM_UNLOCK_SHARED(pVM);
233	return VINF_IOM_R3_IOPORT_READ;
234	}
235	#endif
236	void *pvUser = pRegEntry->pvUser;
237	IOM_UNLOCK_SHARED(pVM);
238	AssertPtr(pDevIns);
239	AssertPtr(pfnInCallback);
240
241	/*
242	* Call the device.
243	*/
244	VBOXSTRICTRC rcStrict = PDMCritSectEnter(pVM, pDevIns->CTX_SUFF(pCritSectRo), VINF_IOM_R3_IOPORT_READ);
245	if (rcStrict == VINF_SUCCESS)
246	{
247	/*
248	* First using the string I/O callback.
249	*/
250	if (pfnInStrCallback)
251	{
252	STAM_PROFILE_START(&pStats->CTX_SUFF_Z(ProfIn), a);
253	rcStrict = pfnInStrCallback(pDevIns, pvUser, fFlags & IOM_IOPORT_F_ABS ? uPort : offPort,
254	(uint8_t *)pvDst, pcTransfers, cb);
255	STAM_PROFILE_STOP(&pStats->CTX_SUFF_Z(ProfIn), a);
256	}
257
258	/*
259	* Then doing the single I/O fallback.
260	*/
261	if ( *pcTransfers > 0
262	&& rcStrict == VINF_SUCCESS)
263	{
264	pvDst = (uint8_t )pvDst + (cRequestedTransfers - pcTransfers) * cb;
265	do
266	{
267	uint32_t u32Value = 0;
268	STAM_PROFILE_START(&pStats->CTX_SUFF_Z(ProfIn), a);
269	rcStrict = pfnInCallback(pDevIns, pvUser, fFlags & IOM_IOPORT_F_ABS ? uPort : offPort, &u32Value, cb);
270	STAM_PROFILE_STOP(&pStats->CTX_SUFF_Z(ProfIn), a);
271	if (rcStrict == VERR_IOM_IOPORT_UNUSED)
272	{
273	u32Value = UINT32_MAX;
274	rcStrict = VINF_SUCCESS;
275	}
276	if (IOM_SUCCESS(rcStrict))
277	{
278	switch (cb)
279	{
280	case 4: (uint32_t )pvDst = u32Value; pvDst = (uint8_t *)pvDst + 4; break;
281	case 2: (uint16_t )pvDst = (uint16_t)u32Value; pvDst = (uint8_t *)pvDst + 2; break;
282	case 1: (uint8_t )pvDst = (uint8_t )u32Value; pvDst = (uint8_t *)pvDst + 1; break;
283	default: AssertFailed();
284	}
285	*pcTransfers -= 1;
286	}
287	} while ( *pcTransfers > 0
288	&& rcStrict == VINF_SUCCESS);
289	}
290	PDMCritSectLeave(pVM, pDevIns->CTX_SUFF(pCritSectRo));
291
292	#ifdef VBOX_WITH_STATISTICS
293	# ifndef IN_RING3
294	if (rcStrict == VINF_IOM_R3_IOPORT_READ)
295	STAM_COUNTER_INC(&pStats->InRZToR3);
296	else
297	# endif
298	{
299	STAM_COUNTER_INC(&pStats->CTX_SUFF_Z(In));
300	STAM_COUNTER_INC(&iomIoPortGetStats(pVM, pRegEntry, 0)->Total);
301	}
302	#endif
303	Log3(("IOMIOPortReadStr: uPort=%RTiop pvDst=%p pcTransfer=%p:{%#x->%#x} cb=%d rc=%Rrc\n",
304	uPort, pvDst, pcTransfers, cRequestedTransfers, *pcTransfers, cb, VBOXSTRICTRC_VAL(rcStrict)));
305	}
306	#ifndef IN_RING3
307	else
308	STAM_COUNTER_INC(&pStats->InRZToR3);
309	#endif
310	return rcStrict;
311	}
312
313	/*
314	* Ok, no handler for this port.
315	*/
316	IOM_UNLOCK_SHARED(pVM);
317	*pcTransfers = 0;
318	memset(pvDst, 0xff, cRequestedTransfers * cb);
319	Log3(("IOMIOPortReadStr: uPort=%RTiop (unused) pvDst=%p pcTransfer=%p:{%#x->%#x} cb=%d rc=VINF_SUCCESS\n",
320	uPort, pvDst, pcTransfers, cRequestedTransfers, *pcTransfers, cb));
321	return VINF_SUCCESS;
322	}
323
324
325	#ifndef IN_RING3
326	/**
327	* Defers a pending I/O port write to ring-3.
328	*
329	* @returns VINF_IOM_R3_IOPORT_COMMIT_WRITE
330	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
331	* @param Port The port to write to.
332	* @param u32Value The value to write.
333	* @param cbValue The size of the value (1, 2, 4).
334	*/
335	static VBOXSTRICTRC iomIOPortRing3WritePending(PVMCPU pVCpu, RTIOPORT Port, uint32_t u32Value, size_t cbValue)
336	{
337	Log5(("iomIOPortRing3WritePending: %#x LB %u -> %RTiop\n", u32Value, cbValue, Port));
338	AssertReturn(pVCpu->iom.s.PendingIOPortWrite.cbValue == 0, VERR_IOM_IOPORT_IPE_1);
339	pVCpu->iom.s.PendingIOPortWrite.IOPort = Port;
340	pVCpu->iom.s.PendingIOPortWrite.u32Value = u32Value;
341	pVCpu->iom.s.PendingIOPortWrite.cbValue = (uint32_t)cbValue;
342	VMCPU_FF_SET(pVCpu, VMCPU_FF_IOM);
343	return VINF_IOM_R3_IOPORT_COMMIT_WRITE;
344	}
345	#endif
346
347
348	/**
349	* Writes to an I/O port register.
350	*
351	* @returns Strict VBox status code. Informational status codes other than the one documented
352	* here are to be treated as internal failure. Use IOM_SUCCESS() to check for success.
353	* @retval VINF_SUCCESS Success.
354	* @retval VINF_EM_FIRST-VINF_EM_LAST Success with some exceptions (see IOM_SUCCESS()), the
355	* status code must be passed on to EM.
356	* @retval VINF_IOM_R3_IOPORT_WRITE Defer the write to ring-3. (R0/RC only)
357	*
358	* @param pVM The cross context VM structure.
359	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
360	* @param Port The port to write to.
361	* @param u32Value The value to write.
362	* @param cbValue The size of the register to read in bytes. 1, 2 or 4 bytes.
363	*/
364	VMMDECL(VBOXSTRICTRC) IOMIOPortWrite(PVMCC pVM, PVMCPU pVCpu, RTIOPORT Port, uint32_t u32Value, size_t cbValue)
365	{
366	STAM_COUNTER_INC(&pVM->iom.s.StatIoPortOut);
367	#ifndef IN_RING3
368	Assert(pVCpu->iom.s.PendingIOPortWrite.cbValue == 0);
369	#endif
370
371	/* For lookups we need to share lock IOM. */
372	int rc2 = IOM_LOCK_SHARED(pVM);
373	if (RT_SUCCESS(rc2))
374	{ /* likely */ }
375	#ifndef IN_RING3
376	else if (rc2 == VERR_SEM_BUSY)
377	return iomIOPortRing3WritePending(pVCpu, Port, u32Value, cbValue);
378	#endif
379	else
380	AssertMsgFailedReturn(("rc2=%Rrc\n", rc2), rc2);
381
382	/*
383	* Get the entry for the current context.
384	*/
385	uint16_t offPort;
386	CTX_SUFF(PIOMIOPORTENTRY) pRegEntry = iomIoPortGetEntry(pVM, Port, &offPort, &pVCpu->iom.s.idxIoPortLastWrite);
387	if (pRegEntry)
388	{
389	#ifdef VBOX_WITH_STATISTICS
390	PIOMIOPORTSTATSENTRY pStats = iomIoPortGetStats(pVM, pRegEntry, offPort);
391	#endif
392
393	/*
394	* Found an entry, get the data so we can leave the IOM lock.
395	*/
396	uint16_t const fFlags = pRegEntry->fFlags;
397	PFNIOMIOPORTNEWOUT pfnOutCallback = pRegEntry->pfnOutCallback;
398	PPDMDEVINS pDevIns = pRegEntry->pDevIns;
399	#ifndef IN_RING3
400	if ( pfnOutCallback
401	&& pDevIns
402	&& pRegEntry->cPorts > 0)
403	{ /* likely */ }
404	else
405	{
406	IOM_UNLOCK_SHARED(pVM);
407	STAM_COUNTER_INC(&pStats->OutRZToR3);
408	return iomIOPortRing3WritePending(pVCpu, Port, u32Value, cbValue);
409	}
410	#endif
411	void *pvUser = pRegEntry->pvUser;
412	IOM_UNLOCK_SHARED(pVM);
413	AssertPtr(pDevIns);
414	AssertPtr(pfnOutCallback);
415
416	/*
417	* Call the device.
418	*/
419	VBOXSTRICTRC rcStrict = PDMCritSectEnter(pVM, pDevIns->CTX_SUFF(pCritSectRo), VINF_IOM_R3_IOPORT_WRITE);
420	if (rcStrict == VINF_SUCCESS)
421	{
422	STAM_PROFILE_START(&pStats->CTX_SUFF_Z(ProfOut), a);
423	rcStrict = pfnOutCallback(pDevIns, pvUser, fFlags & IOM_IOPORT_F_ABS ? Port : offPort, u32Value, (unsigned)cbValue);
424	STAM_PROFILE_STOP(&pStats->CTX_SUFF_Z(ProfOut), a);
425
426	PDMCritSectLeave(pVM, pDevIns->CTX_SUFF(pCritSectRo));
427
428	#ifdef VBOX_WITH_STATISTICS
429	# ifndef IN_RING3
430	if (rcStrict != VINF_IOM_R3_IOPORT_WRITE)
431	# endif
432	{
433	STAM_COUNTER_INC(&pStats->CTX_SUFF_Z(Out));
434	STAM_COUNTER_INC(&iomIoPortGetStats(pVM, pRegEntry, 0)->Total);
435	}
436	#endif
437	Log3(("IOMIOPortWrite: Port=%RTiop u32=%08RX32 cb=%d rc=%Rrc\n", Port, u32Value, cbValue, VBOXSTRICTRC_VAL(rcStrict)));
438	}
439	#ifndef IN_RING3
440	if (rcStrict == VINF_IOM_R3_IOPORT_WRITE)
441	{
442	STAM_COUNTER_INC(&pStats->OutRZToR3);
443	return iomIOPortRing3WritePending(pVCpu, Port, u32Value, cbValue);
444	}
445	#endif
446	return rcStrict;
447	}
448
449	/*
450	* Ok, no handler for that port.
451	*/
452	IOM_UNLOCK_SHARED(pVM);
453	Log3(("IOMIOPortWrite: Port=%RTiop u32=%08RX32 cb=%d nop\n", Port, u32Value, cbValue));
454	return VINF_SUCCESS;
455	}
456
457
458	/**
459	* Writes the string buffer of an I/O port register.
460	*
461	* @returns Strict VBox status code. Informational status codes other than the one documented
462	* here are to be treated as internal failure. Use IOM_SUCCESS() to check for success.
463	* @retval VINF_SUCCESS Success or no string I/O callback in
464	* this context.
465	* @retval VINF_EM_FIRST-VINF_EM_LAST Success with some exceptions (see IOM_SUCCESS()), the
466	* status code must be passed on to EM.
467	* @retval VINF_IOM_R3_IOPORT_WRITE Defer the write to ring-3. (R0/RC only)
468	*
469	* @param pVM The cross context VM structure.
470	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
471	* @param uPort The port to write to.
472	* @param pvSrc The guest page to read from.
473	* @param pcTransfers Pointer to the number of transfer units to write, on
474	* return remaining transfer units.
475	* @param cb Size of the transfer unit (1, 2 or 4 bytes).
476	*/
477	VMM_INT_DECL(VBOXSTRICTRC) IOMIOPortWriteString(PVMCC pVM, PVMCPU pVCpu, RTIOPORT uPort, void const *pvSrc,
478	uint32_t *pcTransfers, unsigned cb)
479	{
480	STAM_COUNTER_INC(&pVM->iom.s.StatIoPortOutS);
481	Assert(pVCpu->iom.s.PendingIOPortWrite.cbValue == 0);
482	Assert(cb == 1 \|\| cb == 2 \|\| cb == 4);
483
484	/* Take the IOM lock before performing any device I/O. */
485	int rc2 = IOM_LOCK_SHARED(pVM);
486	if (RT_SUCCESS(rc2))
487	{ /* likely */ }
488	#ifndef IN_RING3
489	else if (rc2 == VERR_SEM_BUSY)
490	return VINF_IOM_R3_IOPORT_WRITE;
491	#endif
492	else
493	AssertMsgFailedReturn(("rc2=%Rrc\n", rc2), rc2);
494
495	const uint32_t cRequestedTransfers = *pcTransfers;
496	Assert(cRequestedTransfers > 0);
497
498	/*
499	* Get the entry for the current context.
500	*/
501	uint16_t offPort;
502	CTX_SUFF(PIOMIOPORTENTRY) pRegEntry = iomIoPortGetEntry(pVM, uPort, &offPort, &pVCpu->iom.s.idxIoPortLastWriteStr);
503	if (pRegEntry)
504	{
505	#ifdef VBOX_WITH_STATISTICS
506	PIOMIOPORTSTATSENTRY pStats = iomIoPortGetStats(pVM, pRegEntry, offPort);
507	#endif
508
509	/*
510	* Found an entry, get the data so we can leave the IOM lock.
511	*/
512	uint16_t const fFlags = pRegEntry->fFlags;
513	PFNIOMIOPORTNEWOUTSTRING pfnOutStrCallback = pRegEntry->pfnOutStrCallback;
514	PFNIOMIOPORTNEWOUT pfnOutCallback = pRegEntry->pfnOutCallback;
515	PPDMDEVINS pDevIns = pRegEntry->pDevIns;
516	#ifndef IN_RING3
517	if ( pfnOutCallback
518	&& pDevIns
519	&& pRegEntry->cPorts > 0)
520	{ /* likely */ }
521	else
522	{
523	IOM_UNLOCK_SHARED(pVM);
524	STAM_COUNTER_INC(&pStats->OutRZToR3);
525	return VINF_IOM_R3_IOPORT_WRITE;
526	}
527	#endif
528	void *pvUser = pRegEntry->pvUser;
529	IOM_UNLOCK_SHARED(pVM);
530	AssertPtr(pDevIns);
531	AssertPtr(pfnOutCallback);
532
533	/*
534	* Call the device.
535	*/
536	VBOXSTRICTRC rcStrict = PDMCritSectEnter(pVM, pDevIns->CTX_SUFF(pCritSectRo), VINF_IOM_R3_IOPORT_WRITE);
537	if (rcStrict == VINF_SUCCESS)
538	{
539	/*
540	* First using string I/O if possible.
541	*/
542	if (pfnOutStrCallback)
543	{
544	STAM_PROFILE_START(&pStats->CTX_SUFF_Z(ProfOut), a);
545	rcStrict = pfnOutStrCallback(pDevIns, pvUser, fFlags & IOM_IOPORT_F_ABS ? uPort : offPort,
546	(uint8_t const *)pvSrc, pcTransfers, cb);
547	STAM_PROFILE_STOP(&pStats->CTX_SUFF_Z(ProfOut), a);
548	}
549
550	/*
551	* Then doing the single I/O fallback.
552	*/
553	if ( *pcTransfers > 0
554	&& rcStrict == VINF_SUCCESS)
555	{
556	pvSrc = (uint8_t )pvSrc + (cRequestedTransfers - pcTransfers) * cb;
557	do
558	{
559	uint32_t u32Value;
560	switch (cb)
561	{
562	case 4: u32Value = (uint32_t )pvSrc; pvSrc = (uint8_t const *)pvSrc + 4; break;
563	case 2: u32Value = (uint16_t )pvSrc; pvSrc = (uint8_t const *)pvSrc + 2; break;
564	case 1: u32Value = (uint8_t )pvSrc; pvSrc = (uint8_t const *)pvSrc + 1; break;
565	default: AssertFailed(); u32Value = UINT32_MAX;
566	}
567	STAM_PROFILE_START(&pStats->CTX_SUFF_Z(ProfOut), a);
568	rcStrict = pfnOutCallback(pDevIns, pvUser, fFlags & IOM_IOPORT_F_ABS ? uPort : offPort, u32Value, cb);
569	STAM_PROFILE_STOP(&pStats->CTX_SUFF_Z(ProfOut), a);
570	if (IOM_SUCCESS(rcStrict))
571	*pcTransfers -= 1;
572	} while ( *pcTransfers > 0
573	&& rcStrict == VINF_SUCCESS);
574	}
575
576	PDMCritSectLeave(pVM, pDevIns->CTX_SUFF(pCritSectRo));
577
578	#ifdef VBOX_WITH_STATISTICS
579	# ifndef IN_RING3
580	if (rcStrict == VINF_IOM_R3_IOPORT_WRITE)
581	STAM_COUNTER_INC(&pStats->OutRZToR3);
582	else
583	# endif
584	{
585	STAM_COUNTER_INC(&pStats->CTX_SUFF_Z(Out));
586	STAM_COUNTER_INC(&iomIoPortGetStats(pVM, pRegEntry, 0)->Total);
587	}
588	#endif
589	Log3(("IOMIOPortWriteStr: uPort=%RTiop pvSrc=%p pcTransfer=%p:{%#x->%#x} cb=%d rcStrict=%Rrc\n",
590	uPort, pvSrc, pcTransfers, cRequestedTransfers, *pcTransfers, cb, VBOXSTRICTRC_VAL(rcStrict)));
591	}
592	#ifndef IN_RING3
593	else
594	STAM_COUNTER_INC(&pStats->OutRZToR3);
595	#endif
596	return rcStrict;
597	}
598
599	/*
600	* Ok, no handler for this port.
601	*/
602	IOM_UNLOCK_SHARED(pVM);
603	*pcTransfers = 0;
604	Log3(("IOMIOPortWriteStr: uPort=%RTiop (unused) pvSrc=%p pcTransfer=%p:{%#x->%#x} cb=%d rc=VINF_SUCCESS\n",
605	uPort, pvSrc, pcTransfers, cRequestedTransfers, *pcTransfers, cb));
606	return VINF_SUCCESS;
607	}
608

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source: vbox/trunk/src/VBox/VMM/VMMAll/IOMAll.cpp@ 92561

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