四川大学操作系统选择题.doc

四川大学操作系统选择题.doc弟一早Thegeneralroleofanoperatingsystemisto::(PSW)&(PSW)(PSW)&Locationofnextinstruction/Inauniprocessorsystem,multiprogrammingincreasesprocessorefficiencyby:选择一个答案Increasingprocessorspeedb・(.,frominboardmemorytoofflinestorage),thefollowingcondition(s)apply:,-RWmemoryWORMmemoryNoneoftheabovexWhenanewblockofdataiswrittenintocachememory,upy:putersystemare:选择一个答案Processor,Registers,MainMemory&,Registers,I/OModules&MainMemoryProcessor,MainMemory,I/OModules&SystemBusJThetwobasictypesofprocessorregistersare:选择一个答案乩NoneoftheaboveUser-visibleanduser-invisibleregistersc・-visibleandControl/StatusregistersAddressregistersmaycontain选择一个答案Memoryaddressesofinstructionsb・:选择一个答案ProgramCounter(PC)JProgramStatusWord(PSW)xTnstructionRegister(TR)d・AlloftheaboveThetwobasicstepsusedbytheprocessorininstructionprocessingare:选择一个答案FetchandInstructioncyclesxTnstructionandExecutecyclesFetchandExecutecyclesVNoneoftheabove力Afetchedinstructionisnormallyloadedintothe:(IR)(AC)(PC)Acommonclassofinterruptsis选择一个答案T/0Xb・esreadytobeservicedbytheprocessor,thedevicesendsthistypeofsignaltotheprocessor:选择一个答案Haltsignalb・:选择一个答案Defineprioritiesforthe