AtapiInterrupt函数是实现ATAPI的中断功能，主要根据SRB来判断是读取数据还是写入数据，然后对IDE设备读取或写入数据，还需要处理很多出错的情况。具体实现代码如下：
#001 BOOLEAN
#002 NTAPI
#003 AtapiInterrupt(
#004 IN PVOID HwDeviceExtension
#005 )
#006
#007 /*++
#008
#009 Routine Description:
#010
#011 This is the interrupt service routine for ATAPI IDE miniport driver.
#012
#013 Arguments:
#014
#015 HwDeviceExtension - HBA miniport driver's adapter data storage
#016
#017 Return Value:
#018
#019 TRUE if expecting an interrupt.
#020
#021 --*/
#022
#023 {
获取IDE的扩展对象结构。
#024 PHW_DEVICE_EXTENSION deviceExtension = HwDeviceExtension;
获取当前SRB数据。
#025 PSCSI_REQUEST_BLOCK srb = deviceExtension->CurrentSrb;
#026 PATAPI_REGISTERS_1 baseIoAddress1;
#027 PATAPI_REGISTERS_2 baseIoAddress2;
每次读取256个双字节，也就是512个字节。
#028 ULONG wordCount = 0,wordsThisInterrupt = 256;
#029 ULONG status;
#030 ULONG i;
#031 UCHAR statusByte,interruptReason;
#032 BOOLEAN atapiDev = FALSE;
#033
获取IDE的基地址。
#034 if (srb) {
如果有SRB，说明直接从SRB里读取基地址就行了。
#035 baseIoAddress1 = (PATAPI_REGISTERS_1)deviceExtension->BaseIoAddress1[srb->TargetId >> 1];
#036 baseIoAddress2 = (PATAPI_REGISTERS_2)deviceExtension->BaseIoAddress2[srb->TargetId >> 1];
#037 } else {
否则就需要PPC的情况，或者使用一个默认的基地址。
#038 DebugPrint((2,
#039 "AtapiInterrupt: CurrentSrb is NULL/n"));
#040 //
#041 // We can only support one ATAPI IDE master on Carolina,so find
#042 // the base address that is non NULL and clear its interrupt before
#043 // returning.
#044 //
#045
#046 #ifdef _PPC_
#047
#048 if ((PATAPI_REGISTERS_1)deviceExtension->BaseIoAddress1[0] != NULL) {
#049 baseIoAddress1 = (PATAPI_REGISTERS_1)deviceExtension->BaseIoAddress1[0];
#050 } else {
#051 baseIoAddress1 = (PATAPI_REGISTERS_1)deviceExtension->BaseIoAddress1[1];
#052 }
#053
#054 GetBaseStatus(baseIoAddress1,statusByte);
#055 #else
#056
使用一个默认的基地址
#057 if (deviceExtension->InterruptMode == LevelSensitive) {
#058 if (deviceExtension->BaseIoAddress1[0] != NULL) {
#059 baseIoAddress1 = (PATAPI_REGISTERS_1)deviceExtension->BaseIoAddress1[0];
#060 GetBaseStatus(baseIoAddress1,statusByte);
#061 }
#062 if (deviceExtension->BaseIoAddress1[1] != NULL) {
#063 baseIoAddress1 = (PATAPI_REGISTERS_1)deviceExtension->BaseIoAddress1[1];
#064 GetBaseStatus(baseIoAddress1,statusByte);
#065 }
#066 }
#067 #endif
如果没有基地址，这个驱动程序不能访问IDE控制器。
#068 return FALSE;
#069 }
#070
如果驱动程序不能接收中断，就直接返回去。
#071 if (!(deviceExtension->ExpectingInterrupt)) {
#072
#073 DebugPrint((3,
#074 "AtapiInterrupt: Unexpected interrupt./n"));
#075 return FALSE;
#076 }
#077
#078 //
#079 // Clear interrupt by reading status.
#080 //
#081
读取当前状态。
#082 GetBaseStatus(baseIoAddress1,statusByte);
#083
#084 DebugPrint((3,
#085 "AtapiInterrupt: Entered with status (%x)/n",
#086 statusByte));
#087
#088
如果IDE的状态为忙状态。
#089 if (statusByte & IDE_STATUS_BUSY) {
如果设备需要采用轮询的方式，就直接返回。
#090 if (deviceExtension->DriverMustPoll) {
#091
#092 //
#093 // Crashdump is polling and we got caught with busy asserted.
#094 // Just go away,and we will be polled again shortly.
#095 //
#096
#097 DebugPrint((3,
#098 "AtapiInterrupt: Hit BUSY while polling during crashdump./n"));
#099
#100 return TRUE;
#101 }
#102
#103 //
#104 // Ensure BUSY is non-asserted.
#105 //
#106
如果查询10次，还是忙状态，说明IDE还是在忙，没有办法响应，调用函数ScsiPortNotification来设置回调函数。
#107 for (i = 0; i < 10; i++) {
#108
#109 GetBaseStatus(baseIoAddress1,statusByte);
#110 if (!(statusByte & IDE_STATUS_BUSY)) {
#111 break;
#112 }
#113 ScsiPortStallExecution(5000);
#114 }
#115
#116 if (i == 10) {
#117
#118 DebugPrint((2,
#119 "AtapiInterrupt: BUSY on entry. Status %x,Base IO %x/n",
#120 statusByte,
#121 baseIoAddress1));
#122
#123 ScsiPortNotification(RequestTimerCall,
#124 HwDeviceExtension,
#125 AtapiCallBack,
#126 500);
#127 return TRUE;
#128 }
#129 }
#130
#131
#132 //
#133 // Check for error conditions.
#134 //
#135
如果当前IDE设备的状态为出错，就设置这个SRB请求完成，并且是出错返回。
#136 if (statusByte & IDE_STATUS_ERROR) {
#137
#138 if (srb->Cdb[0] != SCSIOP_REQUEST_SENSE) {
#139
#140 //
#141 // Fail this request.
#142 //
#143
#144 status = SRB_STATUS_ERROR;
#145 goto CompleteRequest;
#146 }
#147 }
#148
#149 //
#150 // check reason for this interrupt.
#151 //
#152
如果没有出错，也没有忙状态，判断这个中断的原因是什么。
#153 if (deviceExtension->DeviceFlags[srb->TargetId] & DFLAGS_ATAPI_DEVICE) {
如果ATAPI设备中断，就读取中断的原因，并设置传送的字节数为512个字节。
#154
#155 interruptReason = (ScsiPortReadPortUchar(&baseIoAddress1->InterruptReason) & 0x3);
#156 atapiDev = TRUE;
#157 wordsThisInterrupt = 256;
#158
#159 } else {
#160
如果是DRQ的方式传送，就进入下面处理。
#161 if (statusByte & IDE_STATUS_DRQ) {
#162
多块传送数据。
#163 if (deviceExtension->MaximumBlockXfer[srb->TargetId]) {
#164 wordsThisInterrupt = 256 * deviceExtension->MaximumBlockXfer[srb->TargetId];
#165
#166 }
#167
读取数据进来。
#168 if (srb->SrbFlags & SRB_FLAGS_DATA_IN) {
#169
#170 interruptReason = 0x2;
#171
传送数据出去。
#172 } else if (srb->SrbFlags & SRB_FLAGS_DATA_OUT) {
#173 interruptReason = 0x0;
#174
#175 } else {
错误请求中断。
#176 status = SRB_STATUS_ERROR;
#177 goto CompleteRequest;
#178 }
#179
#180 } else if (statusByte & IDE_STATUS_BUSY) {
#181
#182 return FALSE;
#183
#184 } else {
#185
如果需要补充写字节，就进入下面处理。
#186 if (deviceExtension->WordsLeft) {
#187
#188 ULONG k;
#189
#190 //
#191 // Funky behavIoUr seen with PCI IDE (not all,just one).
#192 // The ISR hits with DRQ low,but comes up later.
#193 //
#194
#195 for (k = 0; k < 5000; k++) {
#196 GetStatus(baseIoAddress2,statusByte);
#197 if (!(statusByte & IDE_STATUS_DRQ)) {
#198 ScsiPortStallExecution(100);
#199 } else {
#200 break;
#201 }
#202 }
#203
#204 if (k == 5000) {
#205
#206 //
#207 // reset the controller.
#208 //
#209
#210 DebugPrint((1,
#211 "AtapiInterrupt: Resetting due to DRQ not up. Status %x,
#212 statusByte,
#213 baseIoAddress1));
#214
#215 AtapiResetController(HwDeviceExtension,srb->PathId);
#216 return TRUE;
#217 } else {
#218
#219 interruptReason = (srb->SrbFlags & SRB_FLAGS_DATA_IN) ? 0x2 : 0x0;
#220 }
#221
#222 } else {
#223
下面获取媒介的状态。
#224 //
#225 // Command complete - verify,write,or the SMART enable/disable.
#226 //
#227 // Also get_media_status
#228
#229 interruptReason = 0x3;
#230 }
#231 }
#232 }
#233
根据中断原因进行处理。
#234 if (interruptReason == 0x1 && (statusByte & IDE_STATUS_DRQ)) {
#235
中断原因是写数据到IDE设备。
#236 //
#237 // Write the packet.
#238 //
#239
#240 DebugPrint((2,
#241 "AtapiInterrupt: Writing Atapi packet./n"));
#242
#243 //
#244 // Send CDB to device.
#245 //
#246
把CDB数据发送给设备。这里的WriteBuffer，其实是调用函数ScsiPortWritePortBufferUshort，它的作用就是把缓冲区里的数据发送到HBA总线上。
#247 WriteBuffer(baseIoAddress1,
#248 (PUSHORT)srb->Cdb,
#249 6);
#250
#251 return TRUE;
#252
#253 } else if (interruptReason == 0x0 && (statusByte & IDE_STATUS_DRQ)) {
#254
#255 //
#256 // Write the data.
#257 //
#258
确认是否ATAPI设备。
#259 if (deviceExtension->DeviceFlags[srb->TargetId] & DFLAGS_ATAPI_DEVICE) {
#260
#261 //
#262 // Pick up bytes to transfer and convert to words.
#263 //
#264
从ATAPI设备里读取要传送的字节数，把字节转换为字的个数。
#265 wordCount =
#266 ScsiPortReadPortUchar(&baseIoAddress1->ByteCountLow);
#267
#268 wordCount |=
#269 ScsiPortReadPortUchar(&baseIoAddress1->ByteCountHigh) << 8;
#270
#271 //
#272 // Covert bytes to words.
#273 //
#274
#275 wordCount >>= 1;
#276
#277 if (wordCount != deviceExtension->WordsLeft) {
#278 DebugPrint((3,
#279 "AtapiInterrupt: %d words requested; %d words xferred/n",
#280 deviceExtension->WordsLeft,
#281 wordCount));
#282 }
#283
如果要传送的字个数大于剩余的个数，那么就只传送剩余的个数。
#284 //
#285 // Verify this makes sense.
#286 //
#287
#288 if (wordCount > deviceExtension->WordsLeft) {
#289 wordCount = deviceExtension->WordsLeft;
#290 }
#291
#292 } else {
#293
#294 //
#295 // IDE path. Check if words left is at least 256.
#296 //
#297
判断是否剩余字个数小于256个字，如果是小于，就只传送剩余个数，否则就传送256个字。
#298 if (deviceExtension->WordsLeft < wordsThisInterrupt) {
#299
#300 //
#301 // Transfer only words requested.
#302 //
#303
#304 wordCount = deviceExtension->WordsLeft;
#305
#306 } else {
#307
#308 //
#309 // Transfer next block.
#310 //
#311
#312 wordCount = wordsThisInterrupt;
#313 }
#314 }
#315
#316 //
#317 // Ensure that this is a write command.
#318 //
#319
检查它是写的命令。
#320 if (srb->SrbFlags & SRB_FLAGS_DATA_OUT) {
#321
#322 DebugPrint((3,
#323 "AtapiInterrupt: Write interrupt/n"));
#324
等到IDE设备不忙。
#325 WaitOnBusy(baseIoAddress2,statusByte);
#326
判断是否写到第三个基地址。
#327 if (atapiDev || !deviceExtension->DWordio) {
#328
#329 WriteBuffer(baseIoAddress1,
#330 deviceExtension->DataBuffer,
#331 wordCount);
#332 } else {
#333
#334 PIDE_REGISTERS_3 address3 = (PIDE_REGISTERS_3)baseIoAddress1;
#335
#336 WriteBuffer2(address3,
#337 (PULONG)(deviceExtension->DataBuffer),
#338 wordCount / 2);
#339 }
#340 } else {
#341
如果不是写的命令，就提示出错返回。
#342 DebugPrint((1,
#343 "AtapiInterrupt: Int reason %x,but srb is for a write %x./n",
#344 interruptReason,
#345 srb));
#346
#347 //
#348 // Fail this request.
#349 //
#350
#351 status = SRB_STATUS_ERROR;
#352 goto CompleteRequest;
#353 }
#354
#355
#356 //
#357 // Advance data buffer pointer and bytes left.
#358 //
#359
调整已经传送的缓冲区字个数，以便下一次传送。
#360 deviceExtension->DataBuffer += wordCount;
#361 deviceExtension->WordsLeft -= wordCount;
#362
#363 return TRUE;
#364
#365 } else if (interruptReason == 0x2 && (statusByte & IDE_STATUS_DRQ)) {
#366
#367
这是读取数据命令。
#368 if (deviceExtension->DeviceFlags[srb->TargetId] & DFLAGS_ATAPI_DEVICE) {
#369
#370 //
#371 // Pick up bytes to transfer and convert to words.
#372 //
#373
读取IDE设备要传送的字节数，并转换为字的个数。
#374 wordCount =
#375 ScsiPortReadPortUchar(&baseIoAddress1->ByteCountLow);
#376
#377 wordCount |=
#378 ScsiPortReadPortUchar(&baseIoAddress1->ByteCountHigh) << 8;
#379
#380 //
#381 // Covert bytes to words.
#382 //
#383
#384 wordCount >>= 1;
#385
请求的个数不等于IDE设备要传送的字节数，就提示。
#386 if (wordCount != deviceExtension->WordsLeft) {
#387 DebugPrint((3,
#388 "AtapiInterrupt: %d words requested; %d words xferred/n",
#389 deviceExtension->WordsLeft,
#390 wordCount));
#391 }
#392
#393 //
#394 // Verify this makes sense.
#395 //
#396
如果取得最小的值来传送。
#397 if (wordCount > deviceExtension->WordsLeft) {
#398 wordCount = deviceExtension->WordsLeft;
#399 }
#400
#401 } else {
#402
#403 //
#404 // Check if words left is at least 256.
#405 //
#406
如果只是传送剩余的字节，就设置传送剩余字节，否则就是传送512个字节。
#407 if (deviceExtension->WordsLeft < wordsThisInterrupt) {
#408
#409 //
#410 // Transfer only words requested.
#411 //
#412
#413 wordCount = deviceExtension->WordsLeft;
#414
#415 } else {
#416
#417 //
#418 // Transfer next block.
#419 //
#420
#421 wordCount = wordsThisInterrupt;
#422 }
#423 }
#424
#425 //
#426 // Ensure that this is a read command.
#427 //
#428
检查这个命令是读取的命令。
#429 if (srb->SrbFlags & SRB_FLAGS_DATA_IN) {
#430
#431 DebugPrint((3,
#432 "AtapiInterrupt: Read interrupt/n"));
#433
等待IDE设备空闲。
#434 WaitOnBusy(baseIoAddress2,statusByte);
#435
读取数据到缓冲区。
#436 if (atapiDev || !deviceExtension->DWordio) {
#437 ReadBuffer(baseIoAddress1,
#438 deviceExtension->DataBuffer,
#439 wordCount);
#440
#441 } else {
使用4字节的方式读取。
#442 PIDE_REGISTERS_3 address3 = (PIDE_REGISTERS_3)baseIoAddress1;
#443
#444 ReadBuffer2(address3,
#445 (PULONG)(deviceExtension->DataBuffer),
#446 wordCount / 2);
#447 }
#448 } else {
#449
处理这个IDE设备请示失败。
#450 DebugPrint((1,
#451 "AtapiInterrupt: Int reason %x,but srb is for a read %x./n",
#452 interruptReason,
#453 srb));
#454
#455 //
#456 // Fail this request.
#457 //
#458
#459 status = SRB_STATUS_ERROR;
#460 goto CompleteRequest;
#461 }
#462
#463 //
#464 // Translate ATAPI data back to SCSI data if needed
#465 //
#466
#467 if (srb->Cdb[0] == ATAPI_MODE_SENSE &&
#468 deviceExtension->DeviceFlags[srb->TargetId] & DFLAGS_ATAPI_DEVICE) {
#469
#470 //
#471 //convert and adjust the wordCount
#472 //
#473
#474 wordCount -= Atapi2Scsi(srb,(char *)deviceExtension->DataBuffer,
#475 wordCount << 1);
#476 }
#477 //
#478 // Advance data buffer pointer and bytes left.
#479 //
#480
调整已经传送的字节。
#481 deviceExtension->DataBuffer += wordCount;
#482 deviceExtension->WordsLeft -= wordCount;
#483
#484 //
#485 // Check for read command complete.
#486 //
#487
检查是否读取完成。
#488 if (deviceExtension->WordsLeft == 0) {
#489
#490 if (deviceExtension->DeviceFlags[srb->TargetId] & DFLAGS_ATAPI_DEVICE) {
#491
#492 //
#493 // Work around to make many atapi devices return correct sector size
#494 // of 2048. Also certain devices will have sector count == 0x00,check
#495 // for that also.
#496 //
#497
#498 if ((srb->Cdb[0] == 0x25) &&
#499 ((deviceExtension->IdentifyData[srb->TargetId].GeneralConfiguration >> 8) & 0x1f) == 0x05) {
#500
#501 deviceExtension->DataBuffer -= wordCount;
#502 if (deviceExtension->DataBuffer[0] == 0x00) {
#503
#504 *((ULONG *) &(deviceExtension->DataBuffer[0])) = 0xFFFFFF7F;
#505
#506 }
#507
#508 *((ULONG *) &(deviceExtension->DataBuffer[2])) = 0x00080000;
#509 deviceExtension->DataBuffer += wordCount;
#510 }
#511 } else {
#512
#513 //
#514 // Completion for IDE drives.
#515 //
#516
到这里已经读取数据完成。
#517
#518 if (deviceExtension->WordsLeft) {
#519
#520 status = SRB_STATUS_DATA_OVERRUN;
#521
#522 } else {
#523
#524 status = SRB_STATUS_SUCCESS;
#525
#526 }
#527
#528 goto CompleteRequest;
#529
#530 }
#531 }
#532
#533 return TRUE;
#534
#535 } else if (interruptReason == 0x3 && !(statusByte & IDE_STATUS_DRQ)) {
#536
#537 //
#538 // Command complete.
#539 //
#540
否则是写数据完成。
#541 if (deviceExtension->WordsLeft) {
#542
#543 status = SRB_STATUS_DATA_OVERRUN;
#544
#545 } else {
#546
#547 status = SRB_STATUS_SUCCESS;
#548
#549 }
#550
#551 CompleteRequest:
#552
#553 //
#554 // Check and see if we are processing our secret (mechanism status/request sense) srb
#555 //
#556 if (deviceExtension->OriginalSrb) {
#557
#558 ULONG srbStatus;
#559
#560 if (srb->Cdb[0] == SCSIOP_MECHANISM_STATUS) {
#561
#562 if (status == SRB_STATUS_SUCCESS) {
#563 // Bingo!!
#564 AtapiHwInitializeChanger (HwDeviceExtension,
#565 srb->TargetId,
#566 (PMECHANICAL_STATUS_INFORMATION_HEADER) srb->DataBuffer);
#567
#568 // Get ready to issue the original srb
#569 srb = deviceExtension->CurrentSrb = deviceExtension->OriginalSrb;
#570 deviceExtension->OriginalSrb = NULL;
#571
#572 } else {
#573 // Failed! Get the sense key and maybe try again
#574 srb = deviceExtension->CurrentSrb = BuildRequestSenseSrb (
#575 HwDeviceExtension,
#576 deviceExtension->OriginalSrb->PathId,
#577 deviceExtension->OriginalSrb->TargetId);
#578 }
#579
重新发送当前SRB数据包。
#580 srbStatus = AtapiSendCommand(HwDeviceExtension,deviceExtension->CurrentSrb);
#581 if (srbStatus == SRB_STATUS_PENDING) {
#582 return TRUE;
#583 }
#584
#585 } else { // srb->Cdb[0] == SCSIOP_REQUEST_SENSE)
#586
#587 PSENSE_DATA senseData = (PSENSE_DATA) srb->DataBuffer;
#588
#589 if (status == SRB_STATUS_DATA_OVERRUN) {
#590 // Check to see if we at least get mininum number of bytes
#591 if ((srb->DataTransferLength - deviceExtension->WordsLeft) >
#592 (FIELD_OFFSET (SENSE_DATA,AdditionalSenseLength) + sizeof(senseData->AdditionalSenseLength))) {
#593 status = SRB_STATUS_SUCCESS;
#594 }
#595 }
#596
#597 if (status == SRB_STATUS_SUCCESS) {
#598 if ((senseData->SenseKey != SCSI_SENSE_ILLEGAL_REQUEST) &&
#599 deviceExtension->MechStatusRetryCount) {
#600
#601 // The sense key doesn't say the last request is illegal,so try again
#602 deviceExtension->MechStatusRetryCount--;
#603 srb = deviceExtension->CurrentSrb = BuildMechanismStatusSrb (
#604 HwDeviceExtension,
#605 deviceExtension->OriginalSrb->PathId,
#606 deviceExtension->OriginalSrb->TargetId);
#607 } else {
#608
#609 // last request was illegal. No point trying again
#610
#611 AtapiHwInitializeChanger (HwDeviceExtension,
#612 srb->TargetId,
#613 (PMECHANICAL_STATUS_INFORMATION_HEADER) NULL);
#614
#615 // Get ready to issue the original srb
#616 srb = deviceExtension->CurrentSrb = deviceExtension->OriginalSrb;
#617 deviceExtension->OriginalSrb = NULL;
#618 }
#619
#620 srbStatus = AtapiSendCommand(HwDeviceExtension,deviceExtension->CurrentSrb);
#621 if (srbStatus == SRB_STATUS_PENDING) {
#622 return TRUE;
#623 }
#624 }
#625 }
#626
#627 // If we get here,it means AtapiSendCommand() has Failed
#628 // Can't recover. Pretend the original srb has Failed and complete it.
#629
运行到这里，已经说明AtapiSendCommand函数发送失败。
#630 if (deviceExtension->OriginalSrb) {
#631 AtapiHwInitializeChanger (HwDeviceExtension,
#632 srb->TargetId,
#633 (PMECHANICAL_STATUS_INFORMATION_HEADER) NULL);
#634 srb = deviceExtension->CurrentSrb = deviceExtension->OriginalSrb;
#635 deviceExtension->OriginalSrb = NULL;
#636 }
#637
#638 // fake an error and read no data
#639 status = SRB_STATUS_ERROR;
#640 srb->ScsiStatus = 0;
#641 deviceExtension->DataBuffer = srb->DataBuffer;
#642 deviceExtension->WordsLeft = srb->DataTransferLength;
#643 deviceExtension->RDP = FALSE;
#644
#645 } else if (status == SRB_STATUS_ERROR) {
#646
#647 //
#648 // Map error to specific SRB status and handle request sense.
#649 //
#650
SRB数据包的状态出错。
#651 status = MapError(deviceExtension,
#652 srb);
#653
#654 deviceExtension->RDP = FALSE;
#655
#656 } else {
#657
#658 //
#659 // Wait for busy to drop.
#660 //
#661
忙等IDE设备，并且复位IDE设备。
#662 for (i = 0; i < 30; i++) {
#663 GetStatus(baseIoAddress2,statusByte);
#664 if (!(statusByte & IDE_STATUS_BUSY)) {
#665 break;
#666 }
#667 ScsiPortStallExecution(500);
#668 }
#669
#670 if (i == 30) {
#671
#672 //
#673 // reset the controller.
#674 //
#675
#676 DebugPrint((1,
#677 "AtapiInterrupt: Resetting due to BSY still up - %x. Base Io %x/n",
#678 statusByte,
#679 baseIoAddress1));
#680 AtapiResetController(HwDeviceExtension,srb->PathId);
#681 return TRUE;
#682 }
#683
#684 //
#685 // Check to see if DRQ is still up.
#686 //
#687
如果IDE设备还是DRQ状态，就等一会，直到不是这个状态。
#688 if (statusByte & IDE_STATUS_DRQ) {
#689
#690 for (i = 0; i < 500; i++) {
#691 GetStatus(baseIoAddress2,statusByte);
#692 if (!(statusByte & IDE_STATUS_DRQ)) {
#693 break;
#694 }
#695 ScsiPortStallExecution(100);
#696
#697 }
#698
#699 if (i == 500) {
#700
#701 //
#702 // reset the controller.
#703 //
#704
#705 DebugPrint((1,
#706 "AtapiInterrupt: Resetting due to DRQ still up - %x/n",
#707 statusByte));
#708 AtapiResetController(HwDeviceExtension,srb->PathId);
#709 return TRUE;
#710 }
#711
#712 }
#713 }
#714
#715
#716 //
#717 // Clear interrupt expecting flag.
#718 //
#719
清除中断标志。
#720 deviceExtension->ExpectingInterrupt = FALSE;
#721
#722 //
#723 // Sanity check that there is a current request.
#724 //
#725
检查当前请求包。
#726 if (srb != NULL) {
#727
#728 //
#729 // Set status in SRB.
#730 //
#731
#732 srb->SrbStatus = (UCHAR)status;
#733
#734 //
#735 // Check for underflow.
#736 //
#737
#738 if (deviceExtension->WordsLeft) {
#739
#740 //
#741 // Subtract out residual words and update if filemark hit,
#742 // setmark hit,end of data,end of media...
#743 //
#744
#745 if (!(deviceExtension->DeviceFlags[srb->TargetId] & DFLAGS_TAPE_DEVICE)) {
#746 if (status == SRB_STATUS_DATA_OVERRUN) {
#747 srb->DataTransferLength -= deviceExtension->WordsLeft;
#748 } else {
#749 srb->DataTransferLength = 0;
#750 }
#751 } else {
#752 srb->DataTransferLength -= deviceExtension->WordsLeft;
#753 }
#754 }
#755
#756 if (srb->Function != SRB_FUNCTION_IO_CONTROL) {
#757
#758 //
#759 // Indicate command complete.
#760 //
#761
#762 if (!(deviceExtension->RDP)) {
#763 ScsiPortNotification(RequestComplete,
#764 deviceExtension,
#765 srb);
#766
#767 }
#768 } else {
#769
#770 PSENDCMDOUTPARAMS cmdOutParameters = (PSENDCMDOUTPARAMS)(((PUCHAR)srb->DataBuffer) + sizeof(SRB_IO_CONTROL));
#771 UCHAR error = 0;
#772
#773 if (status != SRB_STATUS_SUCCESS) {
#774 error = ScsiPortReadPortUchar((PUCHAR)baseIoAddress1 + 1);
#775 }
#776
#777 //
#778 // Build the SMART status block depending upon the completion status.
#779 //
#780
#781 cmdOutParameters->cBufferSize = wordCount;
#782 cmdOutParameters->DriverStatus.bDriverError = (error) ? SMART_IDE_ERROR : 0;
#783 cmdOutParameters->DriverStatus.bIDEError = error;
#784
#785 //
#786 // If the sub-command is return smart status,jam the value from cylinder low and high,into the
#787 // data buffer.
#788 //
#789
#790 if (deviceExtension->SmartCommand == RETURN_SMART_STATUS) {
#791 cmdOutParameters->bBuffer[0] = RETURN_SMART_STATUS;
#792 cmdOutParameters->bBuffer[1] = ScsiPortReadPortUchar(&baseIoAddress1->InterruptReason);
#793 cmdOutParameters->bBuffer[2] = ScsiPortReadPortUchar(&baseIoAddress1->Unused1);
#794 cmdOutParameters->bBuffer[3] = ScsiPortReadPortUchar(&baseIoAddress1->ByteCountLow);
#795 cmdOutParameters->bBuffer[4] = ScsiPortReadPortUchar(&baseIoAddress1->ByteCountHigh);
#796 cmdOutParameters->bBuffer[5] = ScsiPortReadPortUchar(&baseIoAddress1->DriveSelect);
#797 cmdOutParameters->bBuffer[6] = SMART_CMD;
#798 cmdOutParameters->cBufferSize = 8;
#799 }
#800
#801 //
#802 // Indicate command complete.
#803 //
#804
#805 ScsiPortNotification(RequestComplete,
#806 deviceExtension,
#807 srb);
#808
#809 }
#810
#811 } else {
#812
#813 DebugPrint((1,
#814 "AtapiInterrupt: No SRB!/n"));
#815 }
#816
#817 //
#818 // Indicate ready for next request.
#819 //
#820
设置IDE设备可能处理下一个请求包。
#821 if (!(deviceExtension->RDP)) {
#822
#823 //
#824 // Clear current SRB.
#825 //
#826
#827 deviceExtension->CurrentSrb = NULL;
#828
#829 ScsiPortNotification(NextRequest,
#830 deviceExtension,
#831 NULL);
#832 } else {
#833
#834 ScsiPortNotification(RequestTimerCall,
#835 HwDeviceExtension,
#836 AtapiCallBack,
#837 2000);
#838 }
#839
#840 return TRUE;
#841
#842 } else {
#843
#844 //
#845 // Unexpected int.
#846 //
#847
#848 DebugPrint((3,
#849 "AtapiInterrupt: Unexpected interrupt. InterruptReason %x. Status %x./n",
#850 interruptReason,
#851 statusByte));
#852 return FALSE;
#853 }
#854
#855 return TRUE;
#856
#857} // end AtapiInterrupt()
原文链接：https://www.f2er.com/react/308417.html