操作系统教学课件:Chapter 2 Computer-System Structures.ppt,Hardware Protection When executing in monitor mode, the operating system has unrestricted access to both monitor and user’s memory. The load instructions for the base and limit registers are pri
Chapter2:Computer-SystemStructures(6thEdition)OperatingSystemConceptsChapter2Computer-SystemStructures(6thEd.)ComputerSystemOperationI/OStructureStorageStructureStorageHierarchyHardwareProtectionNetworkStructureOperatingSystemConceptsComputer-SystemArchitectureHowdoestheOSgetintosystem?Howdowerequestforservices?HowdoestheOSknow...
–Systemcall–requesttotheoperatingsystemtoallowusertowaitforI/Ocompletion.–Device-statustablecontainsentryforeachI/Odeviceindicatingitstype,address,andstate.–OperatingsystemindexesintoI/Odevicetabletodeterminedevicestatusandtomodifytableentrytoincludeinterrupt.5Dual-ModeOperation•Sharingsystemresourcesrequires...
Operating System Concepts I/O Structure After I/O starts, control returns to user program only upon I/O completion. wait instruction idles the CPU until the next interrupt wait loop (contention for memory access). At most one I/O request is outstanding at a time, no simultaneous I/O proce...
2)CPU等待人工操作。1-2I/O 2.脱机输入/输出(Off-LineI/O)这种脱机I/O(1)减少了CPU的空闲时间。(2)提高I/O速度。输入设备图 脱机示意图 外围机主机外围机 磁盘输出设备 1.2.2单道批处理系统 1.单道批处理系统(SimpleBatchProcessingSystem：内存里仅有一道作业)的处理过程 开始 还有下一个作业？否 ...
8 Operating System Definition (2/2) No universally accepted definition “Everything a vendor ships when you order an operating system” is good approximation but varies wildly “The one program running at all times on the computer” is the operating system kernel. Everything else is either a ...
(資料來源:.ibm.com)麥金塔(Macintosh)系列的電腦系統程式組合語言(Assemblers)Linker&loader編譯程式(compiler)作業系統(operatingsystem)組合語言(Assemblers)LDAa;loadaintoregisterAADDval;addvalSUBONE;subtract1STAB;storeinBassembler的基本功能程式載入到記憶體中編譯程式(compiler)詳細的編譯(...
System Software Operating Systems Utility Programs Language Translators 拿侗记培成是阶堪按屎茫芭溶事骇甫吃缸削陡箔古仍铸闰紫狸葡疥漆尾馈Chaptr 1 - Computer SystemsChaptr 1 - Computer Systems 较砾算怯巧僵弧顺晒识寓即尖乾隅拾内姆酞嚏踊他得棠堂过憎尘反叁低娠Chapt 1 - Computer SystemsChaptr...
ComputerSystemOperation Anoperatingsystemisinterruptdriven.Interrupttransferscontroltotheinterruptserviceroutine generally,throughtheinterruptvector,whichcontainstheaddressesofalltheserviceroutines.Interruptarchitecturemustsavetheaddressoftheinterruptedinstruction.Incominginterruptsaredisabledwhileanotherinterruptisbeingprocessedto...
In some types of embedded 7)___, the application software and the operating system software may be indistinguishable to 8)___, as in the case of software 9)___to control a VCR, DVD 10___or Microwave Oven Read and Complete End D I G A J E B F C H * P.* 1)你应永远履行你...