reactos操作系统实现(111)

IdeSendSmartCommand函数主要发送IDE的命令。具体实现代码如下：

#001 ULONG

#002 NTAPI

#003 IdeSendSmartCommand(

#004 IN PVOID
HwDeviceExtension,

#005 IN PSCSI_REQUEST_BLOCK
Srb

#006 )

#007

#008 /*++

#009

#010 Routine Description:

#011

#012 This routine handles
SMART enable, disable, read attributes and threshold commands.

#013

#014 Arguments:

#015

#016 HwDeviceExtension - HBA
miniport driver's adapter data storage

#017 Srb - IO request packet

#018

#019 Return Value:

#020

#021 SRB status

#022

#023 --*/

#024

#025 {

取得驱动对象和控制器的基地址。

#026 PHW_DEVICE_EXTENSION
deviceExtension = HwDeviceExtension;

#027 PIDE_REGISTERS_1 baseIoAddress1 =
deviceExtension->BaseIoAddress1[Srb->TargetId >> 1];

#028 PIDE_REGISTERS_2 baseIoAddress2 = deviceExtension->BaseIoAddress2[Srb->TargetId
>> 1];

从SRB获取输入参数和输出参数。

#029 PSENDCMDOUTPARAMS cmdOutParameters =
(PSENDCMDOUTPARAMS)(((PUCHAR)Srb->DataBuffer) + sizeof(SRB_IO_CONTROL));

#030 SENDCMDINPARAMS cmdInParameters =
*(PSENDCMDINPARAMS)(((PUCHAR)Srb->DataBuffer) + sizeof(SRB_IO_CONTROL));

#031 PIDEREGS regs =
&cmdInParameters.irDriveRegs;

#032 ULONG i;

#033 UCHAR statusByte,targetId;

#034

#035

检查是否合法的操作。

#036 if
(cmdInParameters.irDriveRegs.bCommandReg == SMART_CMD) {

#037

#038 targetId =
cmdInParameters.bDriveNumber;

#039

#040 //TODO optimize this
check

#041

#042 if
((!(deviceExtension->DeviceFlags[targetId] & DFLAGS_DEVICE_PRESENT)) ||

#043 (deviceExtension->DeviceFlags[targetId]
& DFLAGS_ATAPI_DEVICE)) {

#044

#045 return
SRB_STATUS_SELECTION_TIMEOUT;

#046 }

#047

获取输出的命令。

#048
deviceExtension->SmartCommand =
cmdInParameters.irDriveRegs.bFeaturesReg;

#049

#050 //

#051 // Determine which
of the commands to carry out.

#052 //

#053

检查命令是否读取的操作。

#054 if
((cmdInParameters.irDriveRegs.bFeaturesReg == READ_ATTRIBUTES) ||

#055
(cmdInParameters.irDriveRegs.bFeaturesReg == READ_THRESHOLDS)) {

#056

等待IDE设备空闲。

#057
WaitOnBusy(baseIoAddress2,statusByte);

#058

#059 if (statusByte
& IDE_STATUS_BUSY) {

#060
DebugPrint((1,

#061
"IdeSendSmartCommand: Returning BUSY status/n"));

#062 return
SRB_STATUS_BUSY;

#063 }

#064

#065 //

#066 // Zero the
ouput buffer as the input buffer info. has been saved off locally (the buffers
are the same).

#067 //

#068

清空输出缓冲区。

#069 for (i = 0; i
< (sizeof(SENDCMDOUTPARAMS) + READ_ATTRIBUTE_BUFFER_SIZE - 1); i++) {

#070
((PUCHAR)cmdOutParameters)[i] = 0;

#071 }

#072

#073 //

#074 // Set data
buffer pointer and words left.

#075 //

#076

设置输出缓冲区作为接收IDE设备的数据保存区。

#077
deviceExtension->DataBuffer = (PUSHORT)cmdOutParameters->bBuffer;

#078
deviceExtension->WordsLeft = READ_ATTRIBUTE_BUFFER_SIZE / 2;

#079

#080 //

#081 // Indicate
expecting an interrupt.

#082 //

#083

这里设置希望使用中断的方式返回。

#084
deviceExtension->ExpectingInterrupt = TRUE;

#085

把SRB的命令发送给IDE设备。

#086
ScsiPortWritePortUchar(&baseIoAddress1->DriveSelect,(UCHAR)(((targetId
& 0x1) << 4) | 0xA0));

#087
ScsiPortWritePortUchar((PUCHAR)baseIoAddress1 +
1,regs->bFeaturesReg);

#088
ScsiPortWritePortUchar(&baseIoAddress1->BlockCount,regs->bSectorCountReg);

#089 ScsiPortWritePortUchar(&baseIoAddress1->BlockNumber,regs->bSectorNumberReg);

#090
ScsiPortWritePortUchar(&baseIoAddress1->CylinderLow,regs->bCylLowReg);

#091
ScsiPortWritePortUchar(&baseIoAddress1->CylinderHigh,regs->bCylHighReg);

#092
ScsiPortWritePortUchar(&baseIoAddress1->Command,regs->bCommandReg);

#093

#094 //

#095 // Wait for
interrupt.

#096 //

#097

进入等待中断读取数据返回。

#098 return
SRB_STATUS_PENDING;

#099

#100 } else if
((cmdInParameters.irDriveRegs.bFeaturesReg == ENABLE_SMART) ||

#101
(cmdInParameters.irDriveRegs.bFeaturesReg == DISABLE_SMART) ||

#102
(cmdInParameters.irDriveRegs.bFeaturesReg == RETURN_SMART_STATUS) ||

#103
(cmdInParameters.irDriveRegs.bFeaturesReg == ENABLE_DISABLE_AUTOSAVE) ||

#104
(cmdInParameters.irDriveRegs.bFeaturesReg == EXECUTE_OFFLINE_DIAGS) ||

#105
(cmdInParameters.irDriveRegs.bFeaturesReg == SAVE_ATTRIBUTE_VALUES)) {

#106

这是设置一些属性，没有数据返回。

#107
WaitOnBusy(baseIoAddress2,statusByte);

#108

#109 if (statusByte
& IDE_STATUS_BUSY) {

#110
DebugPrint((1,

#111 "IdeSendSmartCommand: Returning
BUSY status/n"));

#112 return
SRB_STATUS_BUSY;

#113 }

#114

#115 //

#116 // Zero the
ouput buffer as the input buffer info. has been saved off locally (the buffers
are the same).

#117 //

#118

#119 for (i = 0; i
< (sizeof(SENDCMDOUTPARAMS) - 1); i++) {

#120
((PUCHAR)cmdOutParameters)[i] = 0;

#121 }

#122

#123 //

#124 // Set data
buffer pointer and indicate no data transfer.

#125 //

#126

#127
deviceExtension->DataBuffer = (PUSHORT)cmdOutParameters->bBuffer;

#128
deviceExtension->WordsLeft = 0;

#129

#130 //

#131 // Indicate
expecting an interrupt.

#132 //

#133

#134
deviceExtension->ExpectingInterrupt = TRUE;

#135

#136
ScsiPortWritePortUchar(&baseIoAddress1->DriveSelect,(UCHAR)(((targetId
& 0x1) << 4) | 0xA0));

#137 ScsiPortWritePortUchar((PUCHAR)baseIoAddress1
+ 1,regs->bFeaturesReg);

#138
ScsiPortWritePortUchar(&baseIoAddress1->BlockCount,regs->bSectorCountReg);

#139
ScsiPortWritePortUchar(&baseIoAddress1->BlockNumber,regs->bSectorNumberReg);

#140
ScsiPortWritePortUchar(&baseIoAddress1->CylinderLow,regs->bCylLowReg);

#141
ScsiPortWritePortUchar(&baseIoAddress1->CylinderHigh,regs->bCylHighReg);

#142
ScsiPortWritePortUchar(&baseIoAddress1->Command,regs->bCommandReg);

#143

#144 //

#145 // Wait for
interrupt.

#146 //

#147

#148 return
SRB_STATUS_PENDING;

#149 }

#150 }

#151

如果到这里运行，就是非法命令，不能处理。

#152 return
SRB_STATUS_INVALID_REQUEST;

#153

#154 } // end
IdeSendSmartCommand()