AtapiHwInitialize函數初始化不是ATAPT設備，設置它支持多塊傳送。接著判斷那些設備是CD-ROM設備，還清除忙狀態。具體實現代碼如下：

#001? BOOLEAN

#002? NTAPI

#003? AtapiHwInitialize(

#004????? IN PVOID HwDeviceExtension

#005????? )

#006?

#007? /*++

#008?

#009? Routine Description:

#010?

#011? Arguments:

#012?

#013????? HwDeviceExtension - HBA miniport driver's adapter data storage

#014?

#015? Return Value:

#016?

#017????? TRUE - if initialization successful.

#018????? FALSE - if initialization unsuccessful.

#019?

#020? --*/

#021?

#022? {

#023????? PHW_DEVICE_EXTENSION deviceExtension = HwDeviceExtension;

#024????? PIDE_REGISTERS_1???? baseIoAddress;

#025????? ULONG i;

#026????? UCHAR statusByte, errorByte;

#027?

#028?

?

對于兩個通道4個IDE控制器進行初始化。

#029????? for (i = 0; i < 4; i++) {

?

如果IDE的設備存在，就進行處理。

#030????????? if (deviceExtension->DeviceFlags[i] & DFLAGS_DEVICE_PRESENT) {

#031?

?

如果這個設備不是ATAPI設備，就進入下面初始化。

#032????????????? if (!(deviceExtension->DeviceFlags[i] & DFLAGS_ATAPI_DEVICE)) {

#033?

#034????????????????? //

#035????????????????? // Enable media status notification

#036????????????????? //

#037?

?

獲取基地址。

#038????????????????? baseIoAddress = deviceExtension->BaseIoAddress1[i >> 1];

#039?

?

設置媒體感知。

#040????????????????? IdeMediaStatus(TRUE,HwDeviceExtension,i);

#041?

?

如果支持多塊傳送，就設置多塊傳送參數。

#042????????????????? //

#043????????????????? // If supported, setup Multi-block transfers.

#044????????????????? //

#045????????????????? if (deviceExtension->MaximumBlockXfer[i]) {

#046?

#047????????????????????? //

#048????????????????????? // Select the device.

#049????????????????????? //

#050?

#051?????????????? ???????ScsiPortWritePortUchar(&baseIoAddress->DriveSelect,

#052???????????????????????????????????????????? (UCHAR)(((i & 0x1) << 4) | 0xA0));

#053?

#054????????????????????? //

#055????????????????????? // Setup sector count to reflect the # of blocks.

#056????????????????????? //

#057?

#058????????????????????? ScsiPortWritePortUchar(&baseIoAddress->BlockCount,

#059???????????????????????????????????????????? deviceExtension->MaximumBlockXfer[i]);

#060?

#061????????????????????? //

#062??????????????? ??????// Issue the command.

#063????????????????????? //

#064?

?

設置多塊傳送。

#065????????????????????? ScsiPortWritePortUchar(&baseIoAddress->Command,

#066???????????????????????????????????????????? IDE_COMMAND_SET_MULTIPLE);

#067?

#068????????????????????? //

#069????????????????????? // Wait for busy to drop.

#070????????????????????? //

#071?

#072????????????????????? WaitOnBaseBusy(baseIoAddress,statusByte);

#073?

#074????????????????????? //

#075????????????????????? // Check for errors. Reset the value to 0 (disable MultiBlock) if the

#076????????????????????? // command was aborted.

#077????????????????????? //

#078?

?

如果設置多塊傳送命令失敗，就設置為不支持多塊傳送。

#079????????????????????? if (statusByte & IDE_STATUS_ERROR) {

#080?

#081????????????????????????? //

#082 ?????????????????????????// Read the error register.

#083????????????????????????? //

#084?

#085????????????????????????? errorByte = ScsiPortReadPortUchar((PUCHAR)baseIoAddress + 1);

#086?

#087????????????????????????? DebugPrint((1,

#088?????????????? ???????????????????????"AtapiHwInitialize: Error setting multiple mode. Status %x, error byte %x/n",

#089????????????????????????????????????? statusByte,

#090????????????????????????????????????? errorByte));

#091????????????????????????? //

#092???????? ?????????????????// Adjust the devExt. value, if necessary.

#093????????????????????????? //

#094?

#095????????????????????????? deviceExtension->MaximumBlockXfer[i] = 0;

#096?

#097????????????????????? } else {

#098????????????????????????? DebugPrint((2,

#099????????????????????????????????????? "AtapiHwInitialize: Using Multiblock on Device %d. Blocks / int - %d/n",

#100????????????????????????????????????? i,

#101????????????????????????????????????? deviceExtension->MaximumBlockXfer[i]));

#102?????? ???????????????}

#103????????????????? }

#104????????????? } else if (!(deviceExtension->DeviceFlags[i] & DFLAGS_CHANGER_INITED)){

?

如果這個設備還沒有初始化，就進行初始化設置。

#105?

#106????????????????? ULONG j;

#107????????????????? BOOLEAN isSanyo = FALSE;

#108??????????? ??????UCHAR vendorId[26];

#109?

#110????????????????? //

#111????????????????? // Attempt to identify any special-case devices - psuedo-atapi changers, atapi changers, etc.

#112????????????????? //

#113?

?

判斷這個IDE設備是否為CR-ROM設備。

#114????????????????? for (j = 0; j < 13; j += 2) {

#115?

#116????????????????????? //

#117????????????????????? // Build a buffer based on the identify data.

#118????????????????????? //

#119?

#120????????????????????? vendorId[j] = ((PUCHAR)deviceExtension->IdentifyData[i].ModelNumber)[j + 1];

#121????????????????????? vendorId[j+1] = ((PUCHAR)deviceExtension->IdentifyData[i].ModelNumber)[j];

#122????????????????? }

#123?

?

比較IDE設備標識是否為CD-ROM。

#124????????????????? if (!AtapiStringCmp ((PCHAR)vendorId, "CD-ROM? CDR", 11)) {

#125 ?

#126????????????????????? //

#127????????????????????? // Inquiry string for older model had a '-', newer is '_'

#128????????????????????? //

#129?

#130????????????????????? if (vendorId[12] == 'C') {

#131?

#132????????????????????????? //

#133??????? ??????????????????// Torisan changer. Set the bit. This will be used in several places

#134????????????????????????? // acting like 1) a multi-lun device and 2) building the 'special' TUR's.

#135????????????????????????? //

#136?

?

設置設備已經初始化。

#137???????? ?????????????????deviceExtension->DeviceFlags[i] |= (DFLAGS_CHANGER_INITED | DFLAGS_SANYO_ATAPI_CHANGER);

#138????????????????????????? deviceExtension->DiscsPresent[i] = 3;

#139????????????????????????? isSanyo = TRUE;

#140????????????????????? }

#141??? ??????????????}

#142????????????? }

#143?

#144????????????? //

#145????????????? // We need to get our device ready for action before

#146????????????? // returning from this function

#147????????????? //

#148????????????? // According to the atapi spec 2.5 or 2.6, an atapi device

#149????????????? // clears its status BSY bit when it is ready for atapi commands.

#150????????????? // However, some devices (Panasonic SQ-TC500N) are still

#151????????????? // not ready even when the status BSY is clear.? They don't react

#152????????????? // to atapi commands.

#153????????????? //

#154????????????? // Since there is really no other indication that tells us

#155????????????? // the drive is really ready for action.? We are going to check BSY

#156????????????? // is clear and then just wait for an arbitrary amount of time!

#157????????????? //

?

下面開始清除忙狀態。

#158????????????? if (deviceExtension->DeviceFlags[i] & DFLAGS_ATAPI_DEVICE) {

#159????????????????? //PIDE_REGISTERS_1???? baseIoAddress1 = deviceExtension->BaseIoAddress1[i >> 1];

#160????????????????? PIDE_REGISTERS_2???? baseIoAddress2 = deviceExtension->BaseIoAddress2[i >> 1];

#161????????????????? ULONG waitCount;

#162?

#163????????????????? // have to get out of the loop sometime!

#164????????????????? // 10000 * 100us = 1000,000us = 1000ms = 1s

#165????????????????? waitCount = 10000;

#166????????????????? GetStatus(baseIoAddress2, statusByte);

#167????????????????? while ((statusByte & IDE_STATUS_BUSY) && waitCount) {

#168????????????????????? //

#169? ????????????????????// Wait for Busy to drop.

#170????????????????????? //

#171????????????????????? ScsiPortStallExecution(100);

#172????????????????????? GetStatus(baseIoAddress2, statusByte);

#173????????????????????? waitCount--;

#174????????????????? }

#175?

#176????????????????? // 5000 * 100us = 500,000us = 500ms = 0.5s

#177????????????????? waitCount = 5000;

#178????????????????? do {

#179????????????????????? ScsiPortStallExecution(100);

#180????????????????? } while (waitCount--);

#181?????????? ???}

#182????????? }

#183????? }

#184?

#185????? return TRUE;

#186?

#187? } // end AtapiHwInitialize()

轉載于:https://www.cnblogs.com/ajuanabc/archive/2009/10/18/2463678.html

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