InputOutput输入输出

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1、Input/OutputTanenbaumChapter5Silberschatz–Ch12,13I/OHardwareHumanreadableusedtocommunicatewiththeuservideodisplayterminalskeyboard,mouseprinterMachinereadableusedtocommunicatewithelectronicequipmentdiskdrives,tapedrives,modemsserial,parallel,networkportscontrollerscs431-cotter2Di

2、fferencesAmongI/ODevicesDataTransferRateApplicationdiskusedtostorefiles/diskusedtostorevirtualmemorypagesComplexityofcontrolUnitoftransferDatarepresentation(encodingschemes)Errorconditions(devicesrespondtoerrorsdifferently)cs431-cotter3cs431-cotter4Figure5-1.Sometypicaldevice,net

3、work,andbusdatarates.I/ODevicesTanenbaum,ModernOperatingSystems3e,(c)2008Prentice-Hall,Inc.Allrightsreserved.0-13-6006639I/OHardwareConceptsBus(shareddirectaccessordaisychain)cs431-cotter5monitorgraphicscontrollerCPUscsicontrollerIDEdiskcontrollerexpansionbuskeyboardserialportPCI

4、BusbridgecontrollermemorycacheI/OHardwareConceptsBus(shareddirectaccessordaisychain)Portcs431-cotter6monitorgraphicscontrollerCPUscsicontrollerIDEdiskcontrollerexpansionbuskeyboardserialportPCIBusbridgecontrollermemorycacheI/OHardwareConceptsBus(shareddirectaccessordaisychain)Por

5、tControllercs431-cotter7monitorgraphicscontrollerCPUscsicontrollerIDEdiskcontrollerexpansionbuskeyboardserialportPCIBusbridgecontrollermemorycacheApplicationI/OInterfaceObjectiveoftheI/Osystemistoencapsulateindividualdevicebehaviorsingenericclasses.Thedevicedriverlayerhidesthedif

6、ferencesamongI/OcontrollersfromthekernelDevicesvaryinmanydimensionsCharacter-streamvsBlockdevicesSequentialvsRandom-accesslocationSynchronousvsAsynchronousdatatransferSharablevsDedicatedI/OdeviceRead,Write,orRead/Writecs431-cotter8KernelI/OStructureDeviceDriverscs431-cotter9kern

7、elKernelI/OSubsystemSCSIdevicedriver...mousedevicedriverkeyboarddevicedriverPCIbusdevicedriverfloppydevicedriverATAPIdevicedriverSCSIdevicecontrlr...mousedevicecontrlrkeyboarddevicecontrlrPCIbusdevicecontrlrfloppydevicecontrlrATAPIdevicecontrlrSCSIdevice...mousekeyboardPCIbusflop

8、pydriveATAPIdevicesSoftwareI/OTechniques