[21321] | 1 | /* $Id: VBoxSCSI.cpp 32983 2010-10-07 15:14:54Z vboxsync $ */
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| 2 | /** @file
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| 3 | *
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| 4 | * VBox storage devices:
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| 5 | * Simple SCSI interface for BIOS access
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| 6 | */
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| 7 |
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| 8 | /*
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[28800] | 9 | * Copyright (C) 2006-2009 Oracle Corporation
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[21321] | 10 | *
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| 11 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 12 | * available from http://www.virtualbox.org. This file is free software;
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| 13 | * you can redistribute it and/or modify it under the terms of the GNU
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| 14 | * General Public License (GPL) as published by the Free Software
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| 15 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 16 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 17 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 18 | */
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| 19 |
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| 20 | /*******************************************************************************
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| 21 | * Header Files *
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| 22 | *******************************************************************************/
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| 23 | //#define DEBUG
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| 24 | #define LOG_GROUP LOG_GROUP_DEV_BUSLOGIC /* @todo: Create extra group. */
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| 25 |
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| 26 | #if defined(IN_R0) || defined(IN_RC)
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| 27 | # error This device has no R0 or GC components
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| 28 | #endif
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| 29 |
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| 30 | #include <VBox/pdmdev.h>
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| 31 | #include <VBox/pgm.h>
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| 32 | #include <iprt/asm.h>
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| 33 | #include <iprt/mem.h>
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| 34 | #include <iprt/thread.h>
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| 35 | #include <iprt/string.h>
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| 36 |
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| 37 | #include "VBoxSCSI.h"
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| 38 |
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[28684] | 39 | static void vboxscsiReset(PVBOXSCSI pVBoxSCSI)
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[21321] | 40 | {
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| 41 | pVBoxSCSI->regIdentify = 0;
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| 42 | pVBoxSCSI->cbCDB = 0;
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| 43 | memset(pVBoxSCSI->aCDB, 0, sizeof(pVBoxSCSI->aCDB));
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| 44 | pVBoxSCSI->iCDB = 0;
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| 45 | pVBoxSCSI->fBusy = false;
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| 46 | pVBoxSCSI->cbBuf = 0;
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| 47 | pVBoxSCSI->iBuf = 0;
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[28684] | 48 | if (pVBoxSCSI->pBuf)
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| 49 | RTMemFree(pVBoxSCSI->pBuf);
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| 50 |
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[21321] | 51 | pVBoxSCSI->pBuf = NULL;
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| 52 | pVBoxSCSI->enmState = VBOXSCSISTATE_NO_COMMAND;
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| 53 |
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[28684] | 54 | }
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| 55 |
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| 56 | /**
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| 57 | * Initializes the state for the SCSI interface.
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| 58 | *
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| 59 | * @returns VBox status code.
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| 60 | * @param pVBoxSCSI Pointer to the unitialized SCSI state.
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| 61 | */
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| 62 | int vboxscsiInitialize(PVBOXSCSI pVBoxSCSI)
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| 63 | {
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| 64 | pVBoxSCSI->pBuf = NULL;
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| 65 | vboxscsiReset(pVBoxSCSI);
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| 66 |
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[21321] | 67 | return VINF_SUCCESS;
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| 68 | }
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| 69 |
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| 70 | /**
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| 71 | * Reads a register value.
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| 72 | *
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| 73 | * @returns VBox status code.
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| 74 | * @param pVBoxSCSI Pointer to the SCSI state.
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| 75 | * @param iRegister Index of the register to read.
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| 76 | * @param pu32Value Where to store the content of the register.
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| 77 | */
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| 78 | int vboxscsiReadRegister(PVBOXSCSI pVBoxSCSI, uint8_t iRegister, uint32_t *pu32Value)
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| 79 | {
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| 80 | uint8_t uVal = 0;
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| 81 |
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| 82 | switch (iRegister)
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| 83 | {
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| 84 | case 0:
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| 85 | {
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| 86 | if (ASMAtomicReadBool(&pVBoxSCSI->fBusy) == true)
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| 87 | {
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| 88 | uVal |= VBOX_SCSI_BUSY;
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| 89 | /* There is an I/O operation in progress.
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| 90 | * Yield the execution thread to let the I/O thread make progress.
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| 91 | */
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| 92 | RTThreadYield();
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| 93 | }
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| 94 | else
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| 95 | uVal &= ~VBOX_SCSI_BUSY;
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| 96 | break;
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| 97 | }
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| 98 | case 1:
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| 99 | {
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| 100 | if (pVBoxSCSI->cbBuf > 0)
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| 101 | {
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| 102 | AssertMsg(pVBoxSCSI->pBuf, ("pBuf is NULL\n"));
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| 103 | uVal = pVBoxSCSI->pBuf[pVBoxSCSI->iBuf];
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| 104 | pVBoxSCSI->iBuf++;
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| 105 | pVBoxSCSI->cbBuf--;
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| 106 | if (pVBoxSCSI->cbBuf == 0)
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| 107 | {
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| 108 | /** The guest read the last byte from the data in buffer.
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| 109 | * Clear everything and reset command buffer.
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| 110 | */
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| 111 | RTMemFree(pVBoxSCSI->pBuf);
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| 112 | pVBoxSCSI->pBuf = NULL;
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| 113 | pVBoxSCSI->cbCDB = 0;
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| 114 | pVBoxSCSI->iCDB = 0;
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| 115 | pVBoxSCSI->iBuf = 0;
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| 116 | pVBoxSCSI->uTargetDevice = 0;
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| 117 | pVBoxSCSI->enmState = VBOXSCSISTATE_NO_COMMAND;
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| 118 | memset(pVBoxSCSI->aCDB, 0, sizeof(pVBoxSCSI->aCDB));
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| 119 | }
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| 120 | }
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| 121 | break;
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| 122 | }
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| 123 | case 2:
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| 124 | {
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| 125 | uVal = pVBoxSCSI->regIdentify;
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| 126 | break;
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| 127 | }
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| 128 | default:
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| 129 | AssertMsgFailed(("Invalid register to read from %u\n", iRegister));
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| 130 | }
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| 131 |
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| 132 | *pu32Value = uVal;
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| 133 |
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| 134 | return VINF_SUCCESS;
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| 135 | }
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| 136 |
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| 137 | /**
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| 138 | * Writes to a register.
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| 139 | *
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| 140 | * @returns VBox status code.
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| 141 | * VERR_MORE_DATA if a command is ready to be sent to the SCSI driver.
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| 142 | * @param pVBoxSCSI Pointer to the SCSI state.
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| 143 | * @param iRegister Index of the register to write to.
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| 144 | * @param uVal Value to write.
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| 145 | */
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| 146 | int vboxscsiWriteRegister(PVBOXSCSI pVBoxSCSI, uint8_t iRegister, uint8_t uVal)
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| 147 | {
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| 148 | int rc = VINF_SUCCESS;
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| 149 |
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| 150 | switch (iRegister)
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| 151 | {
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| 152 | case 0:
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| 153 | {
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| 154 | if (pVBoxSCSI->enmState == VBOXSCSISTATE_NO_COMMAND)
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| 155 | {
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| 156 | pVBoxSCSI->enmState = VBOXSCSISTATE_READ_TXDIR;
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| 157 | pVBoxSCSI->uTargetDevice = uVal;
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| 158 | }
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| 159 | else if (pVBoxSCSI->enmState == VBOXSCSISTATE_READ_TXDIR)
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| 160 | {
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[28684] | 161 | if (uVal != VBOXSCSI_TXDIR_FROM_DEVICE && uVal != VBOXSCSI_TXDIR_TO_DEVICE)
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| 162 | vboxscsiReset(pVBoxSCSI);
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| 163 | else
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| 164 | {
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| 165 | pVBoxSCSI->enmState = VBOXSCSISTATE_READ_CDB_SIZE;
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| 166 | pVBoxSCSI->uTxDir = uVal;
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| 167 | }
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[21321] | 168 | }
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| 169 | else if (pVBoxSCSI->enmState == VBOXSCSISTATE_READ_CDB_SIZE)
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| 170 | {
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[28684] | 171 | if (uVal > VBOXSCSI_CDB_SIZE_MAX)
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| 172 | vboxscsiReset(pVBoxSCSI);
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| 173 | else
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| 174 | {
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| 175 | pVBoxSCSI->enmState = VBOXSCSISTATE_READ_BUFFER_SIZE_LOW;
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| 176 | pVBoxSCSI->cbCDB = uVal;
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| 177 | }
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[21321] | 178 | }
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| 179 | else if (pVBoxSCSI->enmState == VBOXSCSISTATE_READ_BUFFER_SIZE_LOW)
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| 180 | {
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| 181 | pVBoxSCSI->enmState = VBOXSCSISTATE_READ_BUFFER_SIZE_HIGH;
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| 182 | pVBoxSCSI->cbBuf = uVal;
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| 183 | }
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| 184 | else if (pVBoxSCSI->enmState == VBOXSCSISTATE_READ_BUFFER_SIZE_HIGH)
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| 185 | {
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| 186 | pVBoxSCSI->enmState = VBOXSCSISTATE_READ_COMMAND;
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| 187 | pVBoxSCSI->cbBuf |= (((uint16_t)uVal) << 8);
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| 188 | }
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| 189 | else if (pVBoxSCSI->enmState == VBOXSCSISTATE_READ_COMMAND)
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| 190 | {
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| 191 | pVBoxSCSI->aCDB[pVBoxSCSI->iCDB] = uVal;
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| 192 | pVBoxSCSI->iCDB++;
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| 193 |
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| 194 | /* Check if we have all neccessary command data. */
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| 195 | if (pVBoxSCSI->iCDB == pVBoxSCSI->cbCDB)
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| 196 | {
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| 197 | Log(("%s: Command ready for processing\n", __FUNCTION__));
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| 198 | pVBoxSCSI->enmState = VBOXSCSISTATE_COMMAND_READY;
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| 199 | if (pVBoxSCSI->uTxDir == VBOXSCSI_TXDIR_TO_DEVICE)
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| 200 | {
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| 201 | /* This is a write allocate buffer. */
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| 202 | pVBoxSCSI->pBuf = (uint8_t *)RTMemAllocZ(pVBoxSCSI->cbBuf);
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| 203 | if (!pVBoxSCSI->pBuf)
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| 204 | return VERR_NO_MEMORY;
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| 205 | }
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| 206 | else
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| 207 | {
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| 208 | /* This is a read from the device. */
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| 209 | ASMAtomicXchgBool(&pVBoxSCSI->fBusy, true);
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[26157] | 210 | rc = VERR_MORE_DATA; /** @todo Better return value to indicate ready command? */
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[21321] | 211 | }
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| 212 | }
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| 213 | }
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| 214 | else
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| 215 | AssertMsgFailed(("Invalid state %d\n", pVBoxSCSI->enmState));
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| 216 | break;
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| 217 | }
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| 218 | case 1:
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| 219 | {
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[28684] | 220 | if ( pVBoxSCSI->enmState != VBOXSCSISTATE_COMMAND_READY
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| 221 | || pVBoxSCSI->uTxDir != VBOXSCSI_TXDIR_TO_DEVICE)
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[21321] | 222 | {
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[28684] | 223 | /* Reset the state */
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| 224 | vboxscsiReset(pVBoxSCSI);
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[21321] | 225 | }
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[28684] | 226 | else
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| 227 | {
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| 228 | pVBoxSCSI->pBuf[pVBoxSCSI->iBuf++] = uVal;
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| 229 | if (pVBoxSCSI->iBuf == pVBoxSCSI->cbBuf)
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| 230 | {
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| 231 | rc = VERR_MORE_DATA;
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| 232 | ASMAtomicXchgBool(&pVBoxSCSI->fBusy, true);
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| 233 | }
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| 234 | }
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[21321] | 235 | break;
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| 236 | }
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| 237 | case 2:
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| 238 | {
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| 239 | pVBoxSCSI->regIdentify = uVal;
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| 240 | break;
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| 241 | }
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[28684] | 242 | case 3:
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| 243 | {
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| 244 | /* Reset */
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| 245 | vboxscsiReset(pVBoxSCSI);
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| 246 | break;
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| 247 | }
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[21321] | 248 | default:
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| 249 | AssertMsgFailed(("Invalid register to write to %u\n", iRegister));
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| 250 | }
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| 251 |
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| 252 | return rc;
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| 253 | }
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| 254 |
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| 255 | /**
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| 256 | * Sets up a SCSI request which the owning SCSI device can process.
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| 257 | *
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| 258 | * @returns VBox status code.
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| 259 | * @param pVBoxSCSI Pointer to the SCSI state.
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| 260 | * @param pScsiRequest Pointer to a scsi request to setup.
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| 261 | * @param puTargetDevice Where to store the target device ID.
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| 262 | */
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| 263 | int vboxscsiSetupRequest(PVBOXSCSI pVBoxSCSI, PPDMSCSIREQUEST pScsiRequest, uint32_t *puTargetDevice)
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| 264 | {
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| 265 | int rc = VINF_SUCCESS;
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| 266 |
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| 267 | LogFlowFunc(("pVBoxSCSI=%#p pScsiRequest=%#p puTargetDevice=%#p\n", pVBoxSCSI, pScsiRequest, puTargetDevice));
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| 268 |
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| 269 | AssertMsg(pVBoxSCSI->enmState == VBOXSCSISTATE_COMMAND_READY, ("Invalid state %u\n", pVBoxSCSI->enmState));
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| 270 |
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| 271 | if (pVBoxSCSI->uTxDir == VBOXSCSI_TXDIR_FROM_DEVICE)
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| 272 | {
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[32983] | 273 | if (pVBoxSCSI->pBuf)
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| 274 | RTMemFree(pVBoxSCSI->pBuf);
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| 275 |
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[21321] | 276 | pVBoxSCSI->pBuf = (uint8_t *)RTMemAllocZ(pVBoxSCSI->cbBuf);
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| 277 | if (!pVBoxSCSI->pBuf)
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| 278 | return VERR_NO_MEMORY;
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| 279 | }
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| 280 |
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[32983] | 281 | /* Allocate scatter gather element. */
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[28065] | 282 | pScsiRequest->paScatterGatherHead = (PRTSGSEG)RTMemAllocZ(sizeof(RTSGSEG) * 1); /* Only one element. */
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[21321] | 283 | if (!pScsiRequest->paScatterGatherHead)
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| 284 | {
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| 285 | RTMemFree(pVBoxSCSI->pBuf);
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| 286 | pVBoxSCSI->pBuf = NULL;
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| 287 | return VERR_NO_MEMORY;
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| 288 | }
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| 289 |
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[32983] | 290 | /* Allocate sense buffer. */
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[21321] | 291 | pScsiRequest->cbSenseBuffer = 18;
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| 292 | pScsiRequest->pbSenseBuffer = (uint8_t *)RTMemAllocZ(pScsiRequest->cbSenseBuffer);
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| 293 |
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| 294 | pScsiRequest->cbCDB = pVBoxSCSI->cbCDB;
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| 295 | pScsiRequest->pbCDB = pVBoxSCSI->aCDB;
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| 296 | pScsiRequest->uLogicalUnit = 0;
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| 297 | pScsiRequest->cbScatterGather = pVBoxSCSI->cbBuf;
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| 298 | pScsiRequest->cScatterGatherEntries = 1;
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| 299 |
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| 300 | pScsiRequest->paScatterGatherHead[0].cbSeg = pVBoxSCSI->cbBuf;
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| 301 | pScsiRequest->paScatterGatherHead[0].pvSeg = pVBoxSCSI->pBuf;
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| 302 |
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| 303 | *puTargetDevice = pVBoxSCSI->uTargetDevice;
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| 304 |
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| 305 | return rc;
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| 306 | }
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| 307 |
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| 308 | /**
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| 309 | * Notifies the device that a request finished and the incoming data
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| 310 | * is ready at the incoming data port.
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| 311 | */
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| 312 | int vboxscsiRequestFinished(PVBOXSCSI pVBoxSCSI, PPDMSCSIREQUEST pScsiRequest)
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| 313 | {
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| 314 | LogFlowFunc(("pVBoxSCSI=%#p pScsiRequest=%#p\n", pVBoxSCSI, pScsiRequest));
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| 315 | RTMemFree(pScsiRequest->paScatterGatherHead);
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| 316 | RTMemFree(pScsiRequest->pbSenseBuffer);
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| 317 |
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| 318 | if (pVBoxSCSI->uTxDir == VBOXSCSI_TXDIR_TO_DEVICE)
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| 319 | {
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| 320 | if (pVBoxSCSI->pBuf)
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| 321 | RTMemFree(pVBoxSCSI->pBuf);
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| 322 | pVBoxSCSI->pBuf = NULL;
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| 323 | pVBoxSCSI->cbBuf = 0;
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| 324 | pVBoxSCSI->cbCDB = 0;
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| 325 | pVBoxSCSI->iCDB = 0;
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| 326 | pVBoxSCSI->iBuf = 0;
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| 327 | pVBoxSCSI->uTargetDevice = 0;
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| 328 | pVBoxSCSI->enmState = VBOXSCSISTATE_NO_COMMAND;
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| 329 | memset(pVBoxSCSI->aCDB, 0, sizeof(pVBoxSCSI->aCDB));
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| 330 | }
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| 331 |
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| 332 | ASMAtomicXchgBool(&pVBoxSCSI->fBusy, false);
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| 333 |
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| 334 | return VINF_SUCCESS;
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| 335 | }
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| 336 |
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| 337 | int vboxscsiReadString(PPDMDEVINS pDevIns, PVBOXSCSI pVBoxSCSI, uint8_t iRegister,
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| 338 | RTGCPTR *pGCPtrDst, PRTGCUINTREG pcTransfer, unsigned cb)
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| 339 | {
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| 340 | RTGCPTR GCDst = *pGCPtrDst;
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| 341 | uint32_t cbTransfer = *pcTransfer * cb;
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| 342 |
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| 343 | LogFlowFunc(("pDevIns=%#p pVBoxSCSI=%#p iRegister=%d cTransfer=%u cb=%u\n",
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| 344 | pDevIns, pVBoxSCSI, iRegister, *pcTransfer, cb));
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| 345 |
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| 346 | /* Read string only valid for data in register. */
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| 347 | AssertMsg(iRegister == 1, ("Hey only register 1 can be read from with string\n"));
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| 348 | Assert(pVBoxSCSI->pBuf);
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| 349 |
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[26157] | 350 | int rc = PGMPhysSimpleDirtyWriteGCPtr(PDMDevHlpGetVMCPU(pDevIns), GCDst, pVBoxSCSI->pBuf, cbTransfer);
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[21321] | 351 | AssertRC(rc);
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| 352 |
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| 353 | *pGCPtrDst = (RTGCPTR)((RTGCUINTPTR)GCDst + cbTransfer);
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| 354 | *pcTransfer = 0;
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| 355 |
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| 356 | RTMemFree(pVBoxSCSI->pBuf);
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| 357 | pVBoxSCSI->pBuf = NULL;
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| 358 | pVBoxSCSI->cbBuf = 0;
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| 359 | pVBoxSCSI->cbCDB = 0;
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| 360 | pVBoxSCSI->iCDB = 0;
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| 361 | pVBoxSCSI->iBuf = 0;
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| 362 | pVBoxSCSI->uTargetDevice = 0;
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| 363 | pVBoxSCSI->enmState = VBOXSCSISTATE_NO_COMMAND;
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| 364 | memset(pVBoxSCSI->aCDB, 0, sizeof(pVBoxSCSI->aCDB));
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| 365 |
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| 366 | return rc;
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| 367 | }
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| 368 |
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| 369 | int vboxscsiWriteString(PPDMDEVINS pDevIns, PVBOXSCSI pVBoxSCSI, uint8_t iRegister,
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[26157] | 370 | RTGCPTR *pGCPtrSrc, PRTGCUINTREG pcTransfer, unsigned cb)
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[21321] | 371 | {
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| 372 | RTGCPTR GCSrc = *pGCPtrSrc;
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| 373 | uint32_t cbTransfer = *pcTransfer * cb;
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| 374 |
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| 375 | /* Read string only valid for data in register. */
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| 376 | AssertMsg(iRegister == 1, ("Hey only register 1 can be read from with string\n"));
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| 377 | AssertMsg(cbTransfer == 512, ("Only 512 byte transfers are allowed\n"));
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| 378 |
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[26157] | 379 |
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| 380 | int rc = PDMDevHlpPhysReadGCVirt(pDevIns, pVBoxSCSI->pBuf, GCSrc, cbTransfer);
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[21321] | 381 | AssertRC(rc);
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| 382 |
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| 383 | *pGCPtrSrc = (RTGCPTR)((RTGCUINTPTR)GCSrc + cbTransfer);
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| 384 | *pcTransfer = 0;
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| 385 |
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| 386 | return VERR_MORE_DATA;
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| 387 | }
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| 388 |
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[32983] | 389 | void vboxscsiSetRequestRedo(PVBOXSCSI pVBoxSCSI, PPDMSCSIREQUEST pScsiRequest)
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| 390 | {
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| 391 | AssertMsg(pVBoxSCSI->fBusy, ("No request to redo\n"));
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| 392 |
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| 393 | RTMemFree(pScsiRequest->paScatterGatherHead);
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| 394 | RTMemFree(pScsiRequest->pbSenseBuffer);
|
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| 395 |
|
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| 396 | if (pVBoxSCSI->uTxDir == VBOXSCSI_TXDIR_FROM_DEVICE)
|
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| 397 | {
|
---|
| 398 | AssertPtr(pVBoxSCSI->pBuf);
|
---|
| 399 | }
|
---|
| 400 | }
|
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| 401 |
|
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