iAPX 286 Operating System Writers Guide 1983

INTRODUCTION TO PROTECTED MULTITASKING ON THE iAPX 286GLOBAL SPACEFigure 1-6. A One-Level Unprotected Structure121960-45O.S~ Functions in a Dynamic EnvironmentEven though many of the duties of an operating system in a dynamic environment resemble those in astatic environment, the dynamic environment often introduces new complexities. Some additionalfunctions that a dynamic system may require include• Real memory ma~agement• Program loading• Command language interface• Virtual memory management• Load-time bindingCONSTRUCTING THE INITIAL RUN· TIME ENVIRONMENTIntel's System Builder program helps you create the initial executable system. The Builder programcollects object modules into one module, assigns physical addresses, creates system tables, and assignsprivilege levels. A specification language gives you the ability to control precisely what the Builderdoes.1-8 121960-001