/* $Id: IOMAll.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */ /** @file * IOM - Input / Output Monitor - Any Context. */ /* * Copyright (C) 2006-2024 Oracle and/or its affiliates. * * This file is part of VirtualBox base platform packages, as * available from https://www.virtualbox.org. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation, in version 3 of the * License. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see . * * SPDX-License-Identifier: GPL-3.0-only */ /********************************************************************************************************************************* * Header Files * *********************************************************************************************************************************/ #define LOG_GROUP LOG_GROUP_IOM_IOPORT #include #include #include #include "IOMInternal.h" #include #include #include #include #include #include #include #include #include #include #include #include "IOMInline.h" /** * Reads an I/O port register. * * @returns Strict VBox status code. Informational status codes other than the one documented * here are to be treated as internal failure. Use IOM_SUCCESS() to check for success. * @retval VINF_SUCCESS Success. * @retval VINF_EM_FIRST-VINF_EM_LAST Success with some exceptions (see IOM_SUCCESS()), the * status code must be passed on to EM. * @retval VINF_IOM_R3_IOPORT_READ Defer the read to ring-3. (R0/RC only) * * @param pVM The cross context VM structure. * @param pVCpu The cross context virtual CPU structure of the calling EMT. * @param Port The port to read. * @param pu32Value Where to store the value read. * @param cbValue The size of the register to read in bytes. 1, 2 or 4 bytes. */ VMMDECL(VBOXSTRICTRC) IOMIOPortRead(PVMCC pVM, PVMCPU pVCpu, RTIOPORT Port, uint32_t *pu32Value, size_t cbValue) { STAM_COUNTER_INC(&pVM->iom.s.StatIoPortIn); Assert(pVCpu->iom.s.PendingIOPortWrite.cbValue == 0); /** @todo should initialize *pu32Value here because it can happen that some * handle is buggy and doesn't handle all cases. */ /* For lookups we need to share lock IOM. */ int rc2 = IOM_LOCK_SHARED(pVM); if (RT_SUCCESS(rc2)) { /* likely */ } #ifndef IN_RING3 else if (rc2 == VERR_SEM_BUSY) return VINF_IOM_R3_IOPORT_READ; #endif else AssertMsgFailedReturn(("rc2=%Rrc\n", rc2), rc2); /* * Get the entry for the current context. */ uint16_t offPort; CTX_SUFF(PIOMIOPORTENTRY) pRegEntry = iomIoPortGetEntry(pVM, Port, &offPort, &pVCpu->iom.s.idxIoPortLastRead); if (pRegEntry) { #ifdef VBOX_WITH_STATISTICS PIOMIOPORTSTATSENTRY pStats = iomIoPortGetStats(pVM, pRegEntry, offPort); #endif /* * Found an entry, get the data so we can leave the IOM lock. */ uint16_t const fFlags = pRegEntry->fFlags; PFNIOMIOPORTNEWIN pfnInCallback = pRegEntry->pfnInCallback; PPDMDEVINS pDevIns = pRegEntry->pDevIns; #ifndef IN_RING3 if ( pfnInCallback && pDevIns && pRegEntry->cPorts > 0) { /* likely */ } else { STAM_COUNTER_INC(&pStats->InRZToR3); IOM_UNLOCK_SHARED(pVM); return VINF_IOM_R3_IOPORT_READ; } #endif void *pvUser = pRegEntry->pvUser; IOM_UNLOCK_SHARED(pVM); AssertPtr(pDevIns); AssertPtr(pfnInCallback); /* * Call the device. */ VBOXSTRICTRC rcStrict = PDMCritSectEnter(pVM, pDevIns->CTX_SUFF(pCritSectRo), VINF_IOM_R3_IOPORT_READ); if (rcStrict == VINF_SUCCESS) { STAM_PROFILE_START(&pStats->CTX_SUFF_Z(ProfIn), a); rcStrict = pfnInCallback(pDevIns, pvUser, fFlags & IOM_IOPORT_F_ABS ? Port : offPort, pu32Value, (unsigned)cbValue); STAM_PROFILE_STOP(&pStats->CTX_SUFF_Z(ProfIn), a); PDMCritSectLeave(pVM, pDevIns->CTX_SUFF(pCritSectRo)); #ifndef IN_RING3 if (rcStrict == VINF_IOM_R3_IOPORT_READ) STAM_COUNTER_INC(&pStats->InRZToR3); else #endif { STAM_COUNTER_INC(&pStats->CTX_SUFF_Z(In)); STAM_COUNTER_INC(&iomIoPortGetStats(pVM, pRegEntry, 0)->Total); if (rcStrict == VERR_IOM_IOPORT_UNUSED) { /* make return value */ rcStrict = VINF_SUCCESS; switch (cbValue) { case 1: *(uint8_t *)pu32Value = 0xff; break; case 2: *(uint16_t *)pu32Value = 0xffff; break; case 4: *(uint32_t *)pu32Value = UINT32_C(0xffffffff); break; default: AssertMsgFailedReturn(("Invalid I/O port size %d. Port=%d\n", cbValue, Port), VERR_IOM_INVALID_IOPORT_SIZE); } } } Log3(("IOMIOPortRead: Port=%RTiop *pu32=%08RX32 cb=%d rc=%Rrc\n", Port, *pu32Value, cbValue, VBOXSTRICTRC_VAL(rcStrict))); STAM_COUNTER_INC(&iomIoPortGetStats(pVM, pRegEntry, 0)->Total); } else STAM_COUNTER_INC(&pStats->InRZToR3); return rcStrict; } /* * Ok, no handler for this port. */ IOM_UNLOCK_SHARED(pVM); switch (cbValue) { case 1: *(uint8_t *)pu32Value = 0xff; break; case 2: *(uint16_t *)pu32Value = 0xffff; break; case 4: *(uint32_t *)pu32Value = UINT32_C(0xffffffff); break; default: AssertMsgFailedReturn(("Invalid I/O port size %d. Port=%d\n", cbValue, Port), VERR_IOM_INVALID_IOPORT_SIZE); } Log3(("IOMIOPortRead: Port=%RTiop *pu32=%08RX32 cb=%d rc=VINF_SUCCESS\n", Port, *pu32Value, cbValue)); return VINF_SUCCESS; } /** * Reads the string buffer of an I/O port register. * * @returns Strict VBox status code. Informational status codes other than the one documented * here are to be treated as internal failure. Use IOM_SUCCESS() to check for success. * @retval VINF_SUCCESS Success or no string I/O callback in * this context. * @retval VINF_EM_FIRST-VINF_EM_LAST Success with some exceptions (see IOM_SUCCESS()), the * status code must be passed on to EM. * @retval VINF_IOM_R3_IOPORT_READ Defer the read to ring-3. (R0/RC only) * * @param pVM The cross context VM structure. * @param pVCpu The cross context virtual CPU structure of the calling EMT. * @param uPort The port to read. * @param pvDst Pointer to the destination buffer. * @param pcTransfers Pointer to the number of transfer units to read, on return remaining transfer units. * @param cb Size of the transfer unit (1, 2 or 4 bytes). */ VMM_INT_DECL(VBOXSTRICTRC) IOMIOPortReadString(PVMCC pVM, PVMCPU pVCpu, RTIOPORT uPort, void *pvDst, uint32_t *pcTransfers, unsigned cb) { STAM_COUNTER_INC(&pVM->iom.s.StatIoPortInS); Assert(pVCpu->iom.s.PendingIOPortWrite.cbValue == 0); /* For lookups we need to share lock IOM. */ int rc2 = IOM_LOCK_SHARED(pVM); if (RT_SUCCESS(rc2)) { /* likely */ } #ifndef IN_RING3 else if (rc2 == VERR_SEM_BUSY) return VINF_IOM_R3_IOPORT_READ; #endif else AssertMsgFailedReturn(("rc2=%Rrc\n", rc2), rc2); const uint32_t cRequestedTransfers = *pcTransfers; Assert(cRequestedTransfers > 0); /* * Get the entry for the current context. */ uint16_t offPort; CTX_SUFF(PIOMIOPORTENTRY) pRegEntry = iomIoPortGetEntry(pVM, uPort, &offPort, &pVCpu->iom.s.idxIoPortLastReadStr); if (pRegEntry) { #ifdef VBOX_WITH_STATISTICS PIOMIOPORTSTATSENTRY pStats = iomIoPortGetStats(pVM, pRegEntry, offPort); #endif /* * Found an entry, get the data so we can leave the IOM lock. */ uint16_t const fFlags = pRegEntry->fFlags; PFNIOMIOPORTNEWINSTRING pfnInStrCallback = pRegEntry->pfnInStrCallback; PFNIOMIOPORTNEWIN pfnInCallback = pRegEntry->pfnInCallback; PPDMDEVINS pDevIns = pRegEntry->pDevIns; #ifndef IN_RING3 if ( pfnInCallback && pDevIns && pRegEntry->cPorts > 0) { /* likely */ } else { STAM_COUNTER_INC(&pStats->InRZToR3); IOM_UNLOCK_SHARED(pVM); return VINF_IOM_R3_IOPORT_READ; } #endif void *pvUser = pRegEntry->pvUser; IOM_UNLOCK_SHARED(pVM); AssertPtr(pDevIns); AssertPtr(pfnInCallback); /* * Call the device. */ VBOXSTRICTRC rcStrict = PDMCritSectEnter(pVM, pDevIns->CTX_SUFF(pCritSectRo), VINF_IOM_R3_IOPORT_READ); if (rcStrict == VINF_SUCCESS) { /* * First using the string I/O callback. */ if (pfnInStrCallback) { STAM_PROFILE_START(&pStats->CTX_SUFF_Z(ProfIn), a); rcStrict = pfnInStrCallback(pDevIns, pvUser, fFlags & IOM_IOPORT_F_ABS ? uPort : offPort, (uint8_t *)pvDst, pcTransfers, cb); STAM_PROFILE_STOP(&pStats->CTX_SUFF_Z(ProfIn), a); } /* * Then doing the single I/O fallback. */ if ( *pcTransfers > 0 && rcStrict == VINF_SUCCESS) { pvDst = (uint8_t *)pvDst + (cRequestedTransfers - *pcTransfers) * cb; do { uint32_t u32Value = 0; STAM_PROFILE_START(&pStats->CTX_SUFF_Z(ProfIn), a); rcStrict = pfnInCallback(pDevIns, pvUser, fFlags & IOM_IOPORT_F_ABS ? uPort : offPort, &u32Value, cb); STAM_PROFILE_STOP(&pStats->CTX_SUFF_Z(ProfIn), a); if (rcStrict == VERR_IOM_IOPORT_UNUSED) { u32Value = UINT32_MAX; rcStrict = VINF_SUCCESS; } if (IOM_SUCCESS(rcStrict)) { switch (cb) { case 4: *(uint32_t *)pvDst = u32Value; pvDst = (uint8_t *)pvDst + 4; break; case 2: *(uint16_t *)pvDst = (uint16_t)u32Value; pvDst = (uint8_t *)pvDst + 2; break; case 1: *(uint8_t *)pvDst = (uint8_t )u32Value; pvDst = (uint8_t *)pvDst + 1; break; default: AssertFailed(); } *pcTransfers -= 1; } } while ( *pcTransfers > 0 && rcStrict == VINF_SUCCESS); } PDMCritSectLeave(pVM, pDevIns->CTX_SUFF(pCritSectRo)); #ifdef VBOX_WITH_STATISTICS # ifndef IN_RING3 if (rcStrict == VINF_IOM_R3_IOPORT_READ) STAM_COUNTER_INC(&pStats->InRZToR3); else # endif { STAM_COUNTER_INC(&pStats->CTX_SUFF_Z(In)); STAM_COUNTER_INC(&iomIoPortGetStats(pVM, pRegEntry, 0)->Total); } #endif Log3(("IOMIOPortReadStr: uPort=%RTiop pvDst=%p pcTransfer=%p:{%#x->%#x} cb=%d rc=%Rrc\n", uPort, pvDst, pcTransfers, cRequestedTransfers, *pcTransfers, cb, VBOXSTRICTRC_VAL(rcStrict))); } #ifndef IN_RING3 else STAM_COUNTER_INC(&pStats->InRZToR3); #endif return rcStrict; } /* * Ok, no handler for this port. */ IOM_UNLOCK_SHARED(pVM); *pcTransfers = 0; memset(pvDst, 0xff, cRequestedTransfers * cb); Log3(("IOMIOPortReadStr: uPort=%RTiop (unused) pvDst=%p pcTransfer=%p:{%#x->%#x} cb=%d rc=VINF_SUCCESS\n", uPort, pvDst, pcTransfers, cRequestedTransfers, *pcTransfers, cb)); return VINF_SUCCESS; } #ifndef IN_RING3 /** * Defers a pending I/O port write to ring-3. * * @returns VINF_IOM_R3_IOPORT_COMMIT_WRITE * @param pVCpu The cross context virtual CPU structure of the calling EMT. * @param Port The port to write to. * @param u32Value The value to write. * @param cbValue The size of the value (1, 2, 4). */ static VBOXSTRICTRC iomIOPortRing3WritePending(PVMCPU pVCpu, RTIOPORT Port, uint32_t u32Value, size_t cbValue) { Log5(("iomIOPortRing3WritePending: %#x LB %u -> %RTiop\n", u32Value, cbValue, Port)); AssertReturn(pVCpu->iom.s.PendingIOPortWrite.cbValue == 0, VERR_IOM_IOPORT_IPE_1); pVCpu->iom.s.PendingIOPortWrite.IOPort = Port; pVCpu->iom.s.PendingIOPortWrite.u32Value = u32Value; pVCpu->iom.s.PendingIOPortWrite.cbValue = (uint32_t)cbValue; VMCPU_FF_SET(pVCpu, VMCPU_FF_IOM); return VINF_IOM_R3_IOPORT_COMMIT_WRITE; } #endif /** * Writes to an I/O port register. * * @returns Strict VBox status code. Informational status codes other than the one documented * here are to be treated as internal failure. Use IOM_SUCCESS() to check for success. * @retval VINF_SUCCESS Success. * @retval VINF_EM_FIRST-VINF_EM_LAST Success with some exceptions (see IOM_SUCCESS()), the * status code must be passed on to EM. * @retval VINF_IOM_R3_IOPORT_WRITE Defer the write to ring-3. (R0/RC only) * * @param pVM The cross context VM structure. * @param pVCpu The cross context virtual CPU structure of the calling EMT. * @param Port The port to write to. * @param u32Value The value to write. * @param cbValue The size of the register to read in bytes. 1, 2 or 4 bytes. */ VMMDECL(VBOXSTRICTRC) IOMIOPortWrite(PVMCC pVM, PVMCPU pVCpu, RTIOPORT Port, uint32_t u32Value, size_t cbValue) { STAM_COUNTER_INC(&pVM->iom.s.StatIoPortOut); #ifndef IN_RING3 Assert(pVCpu->iom.s.PendingIOPortWrite.cbValue == 0); #endif /* For lookups we need to share lock IOM. */ int rc2 = IOM_LOCK_SHARED(pVM); if (RT_SUCCESS(rc2)) { /* likely */ } #ifndef IN_RING3 else if (rc2 == VERR_SEM_BUSY) return iomIOPortRing3WritePending(pVCpu, Port, u32Value, cbValue); #endif else AssertMsgFailedReturn(("rc2=%Rrc\n", rc2), rc2); /* * Get the entry for the current context. */ uint16_t offPort; CTX_SUFF(PIOMIOPORTENTRY) pRegEntry = iomIoPortGetEntry(pVM, Port, &offPort, &pVCpu->iom.s.idxIoPortLastWrite); if (pRegEntry) { #ifdef VBOX_WITH_STATISTICS PIOMIOPORTSTATSENTRY pStats = iomIoPortGetStats(pVM, pRegEntry, offPort); #endif /* * Found an entry, get the data so we can leave the IOM lock. */ uint16_t const fFlags = pRegEntry->fFlags; PFNIOMIOPORTNEWOUT pfnOutCallback = pRegEntry->pfnOutCallback; PPDMDEVINS pDevIns = pRegEntry->pDevIns; #ifndef IN_RING3 if ( pfnOutCallback && pDevIns && pRegEntry->cPorts > 0) { /* likely */ } else { IOM_UNLOCK_SHARED(pVM); STAM_COUNTER_INC(&pStats->OutRZToR3); return iomIOPortRing3WritePending(pVCpu, Port, u32Value, cbValue); } #endif void *pvUser = pRegEntry->pvUser; IOM_UNLOCK_SHARED(pVM); AssertPtr(pDevIns); AssertPtr(pfnOutCallback); /* * Call the device. */ VBOXSTRICTRC rcStrict = PDMCritSectEnter(pVM, pDevIns->CTX_SUFF(pCritSectRo), VINF_IOM_R3_IOPORT_WRITE); if (rcStrict == VINF_SUCCESS) { STAM_PROFILE_START(&pStats->CTX_SUFF_Z(ProfOut), a); rcStrict = pfnOutCallback(pDevIns, pvUser, fFlags & IOM_IOPORT_F_ABS ? Port : offPort, u32Value, (unsigned)cbValue); STAM_PROFILE_STOP(&pStats->CTX_SUFF_Z(ProfOut), a); PDMCritSectLeave(pVM, pDevIns->CTX_SUFF(pCritSectRo)); #ifdef VBOX_WITH_STATISTICS # ifndef IN_RING3 if (rcStrict != VINF_IOM_R3_IOPORT_WRITE) # endif { STAM_COUNTER_INC(&pStats->CTX_SUFF_Z(Out)); STAM_COUNTER_INC(&iomIoPortGetStats(pVM, pRegEntry, 0)->Total); } #endif Log3(("IOMIOPortWrite: Port=%RTiop u32=%08RX32 cb=%d rc=%Rrc\n", Port, u32Value, cbValue, VBOXSTRICTRC_VAL(rcStrict))); } #ifndef IN_RING3 if (rcStrict == VINF_IOM_R3_IOPORT_WRITE) { STAM_COUNTER_INC(&pStats->OutRZToR3); return iomIOPortRing3WritePending(pVCpu, Port, u32Value, cbValue); } #endif return rcStrict; } /* * Ok, no handler for that port. */ IOM_UNLOCK_SHARED(pVM); Log3(("IOMIOPortWrite: Port=%RTiop u32=%08RX32 cb=%d nop\n", Port, u32Value, cbValue)); return VINF_SUCCESS; } /** * Writes the string buffer of an I/O port register. * * @returns Strict VBox status code. Informational status codes other than the one documented * here are to be treated as internal failure. Use IOM_SUCCESS() to check for success. * @retval VINF_SUCCESS Success or no string I/O callback in * this context. * @retval VINF_EM_FIRST-VINF_EM_LAST Success with some exceptions (see IOM_SUCCESS()), the * status code must be passed on to EM. * @retval VINF_IOM_R3_IOPORT_WRITE Defer the write to ring-3. (R0/RC only) * * @param pVM The cross context VM structure. * @param pVCpu The cross context virtual CPU structure of the calling EMT. * @param uPort The port to write to. * @param pvSrc The guest page to read from. * @param pcTransfers Pointer to the number of transfer units to write, on * return remaining transfer units. * @param cb Size of the transfer unit (1, 2 or 4 bytes). */ VMM_INT_DECL(VBOXSTRICTRC) IOMIOPortWriteString(PVMCC pVM, PVMCPU pVCpu, RTIOPORT uPort, void const *pvSrc, uint32_t *pcTransfers, unsigned cb) { STAM_COUNTER_INC(&pVM->iom.s.StatIoPortOutS); Assert(pVCpu->iom.s.PendingIOPortWrite.cbValue == 0); Assert(cb == 1 || cb == 2 || cb == 4); /* Take the IOM lock before performing any device I/O. */ int rc2 = IOM_LOCK_SHARED(pVM); if (RT_SUCCESS(rc2)) { /* likely */ } #ifndef IN_RING3 else if (rc2 == VERR_SEM_BUSY) return VINF_IOM_R3_IOPORT_WRITE; #endif else AssertMsgFailedReturn(("rc2=%Rrc\n", rc2), rc2); const uint32_t cRequestedTransfers = *pcTransfers; Assert(cRequestedTransfers > 0); /* * Get the entry for the current context. */ uint16_t offPort; CTX_SUFF(PIOMIOPORTENTRY) pRegEntry = iomIoPortGetEntry(pVM, uPort, &offPort, &pVCpu->iom.s.idxIoPortLastWriteStr); if (pRegEntry) { #ifdef VBOX_WITH_STATISTICS PIOMIOPORTSTATSENTRY pStats = iomIoPortGetStats(pVM, pRegEntry, offPort); #endif /* * Found an entry, get the data so we can leave the IOM lock. */ uint16_t const fFlags = pRegEntry->fFlags; PFNIOMIOPORTNEWOUTSTRING pfnOutStrCallback = pRegEntry->pfnOutStrCallback; PFNIOMIOPORTNEWOUT pfnOutCallback = pRegEntry->pfnOutCallback; PPDMDEVINS pDevIns = pRegEntry->pDevIns; #ifndef IN_RING3 if ( pfnOutCallback && pDevIns && pRegEntry->cPorts > 0) { /* likely */ } else { IOM_UNLOCK_SHARED(pVM); STAM_COUNTER_INC(&pStats->OutRZToR3); return VINF_IOM_R3_IOPORT_WRITE; } #endif void *pvUser = pRegEntry->pvUser; IOM_UNLOCK_SHARED(pVM); AssertPtr(pDevIns); AssertPtr(pfnOutCallback); /* * Call the device. */ VBOXSTRICTRC rcStrict = PDMCritSectEnter(pVM, pDevIns->CTX_SUFF(pCritSectRo), VINF_IOM_R3_IOPORT_WRITE); if (rcStrict == VINF_SUCCESS) { /* * First using string I/O if possible. */ if (pfnOutStrCallback) { STAM_PROFILE_START(&pStats->CTX_SUFF_Z(ProfOut), a); rcStrict = pfnOutStrCallback(pDevIns, pvUser, fFlags & IOM_IOPORT_F_ABS ? uPort : offPort, (uint8_t const *)pvSrc, pcTransfers, cb); STAM_PROFILE_STOP(&pStats->CTX_SUFF_Z(ProfOut), a); } /* * Then doing the single I/O fallback. */ if ( *pcTransfers > 0 && rcStrict == VINF_SUCCESS) { pvSrc = (uint8_t *)pvSrc + (cRequestedTransfers - *pcTransfers) * cb; do { uint32_t u32Value; switch (cb) { case 4: u32Value = *(uint32_t *)pvSrc; pvSrc = (uint8_t const *)pvSrc + 4; break; case 2: u32Value = *(uint16_t *)pvSrc; pvSrc = (uint8_t const *)pvSrc + 2; break; case 1: u32Value = *(uint8_t *)pvSrc; pvSrc = (uint8_t const *)pvSrc + 1; break; default: AssertFailed(); u32Value = UINT32_MAX; } STAM_PROFILE_START(&pStats->CTX_SUFF_Z(ProfOut), a); rcStrict = pfnOutCallback(pDevIns, pvUser, fFlags & IOM_IOPORT_F_ABS ? uPort : offPort, u32Value, cb); STAM_PROFILE_STOP(&pStats->CTX_SUFF_Z(ProfOut), a); if (IOM_SUCCESS(rcStrict)) *pcTransfers -= 1; } while ( *pcTransfers > 0 && rcStrict == VINF_SUCCESS); } PDMCritSectLeave(pVM, pDevIns->CTX_SUFF(pCritSectRo)); #ifdef VBOX_WITH_STATISTICS # ifndef IN_RING3 if (rcStrict == VINF_IOM_R3_IOPORT_WRITE) STAM_COUNTER_INC(&pStats->OutRZToR3); else # endif { STAM_COUNTER_INC(&pStats->CTX_SUFF_Z(Out)); STAM_COUNTER_INC(&iomIoPortGetStats(pVM, pRegEntry, 0)->Total); } #endif Log3(("IOMIOPortWriteStr: uPort=%RTiop pvSrc=%p pcTransfer=%p:{%#x->%#x} cb=%d rcStrict=%Rrc\n", uPort, pvSrc, pcTransfers, cRequestedTransfers, *pcTransfers, cb, VBOXSTRICTRC_VAL(rcStrict))); } #ifndef IN_RING3 else STAM_COUNTER_INC(&pStats->OutRZToR3); #endif return rcStrict; } /* * Ok, no handler for this port. */ IOM_UNLOCK_SHARED(pVM); *pcTransfers = 0; Log3(("IOMIOPortWriteStr: uPort=%RTiop (unused) pvSrc=%p pcTransfer=%p:{%#x->%#x} cb=%d rc=VINF_SUCCESS\n", uPort, pvSrc, pcTransfers, cRequestedTransfers, *pcTransfers, cb)); return VINF_SUCCESS; }