BIOSOverview-同濟大學BIOS和UEFI課程.ppt

Tel：69589584Email:wang.box,同濟大學軟件學院,UEFI與固件程序設計,WhatstheUEFI?,繼續(xù),返回,UEFI(UnifiedExtensibleFirmwareInterface)是由英特爾公司聯合業(yè)界共同提出的一種欲在未來電腦系統(tǒng)中替代傳統(tǒng)BIOS(LegacyBIOS)的升級解決方案。,Anotherquestion,WhatstheBIOS?,WhatstheBIOS?,繼續(xù),返回,BIOS(BasicInputandOutputSystem)基本輸入輸出系統(tǒng)，它是一組固化到計算機內主板上一個ROM芯片上的程序，它保存著計算機最重要的開機上電自檢、硬件初始化程序和系統(tǒng)底層的服務程序等。,繼續(xù),返回,Agenda,BIOSbackgroundHistoryFunctionsLegacyBIOSsFlawsChange,繼續(xù),返回,BIOSbackground-History,BeforefirmwareSwitchsonapieceofplywoodBIOS-fororiginalIBMPC/XTandPC/ATin1980sEFI-Spring2000IDF(IntelDevelopersForum)-EFI1.10specificationUEFIOriginatedfromtheEFI1.10specification-UpdatedandmanagedbytheUnifiedEFIForum,繼續(xù),返回,BIOSbackground-Functions,Basedon8086architecturePOSTPowerOnSelfTestAgroupofclearlydefinedOS-independentinterfaceforhardwareInt10forVideoserviceInt13diskserviceInt16keyboardserviceInt18BIOSROMloaderInt19bootstraploaderAvailabilityofMS-DOSoutsideofIBMallowedapplicationstorunequallywellacrossdifferentbrandsofbox"PCclones".,繼續(xù),返回,BIOSbackground-LegacyBIOSsFlaws,Itisnotplatformindependent,ithighlydependsonIntel8086SoftwareInterruptmodelRealmode16-bitsregisteraccessNomemoryaddressbeyond1MBOptionROMspacelimitedtobelow1MBModernIntelCPUarchitecturehascometo32bits,64bitsprotectionmode,withHTandMulti-core,butforcompatibility,itshouldstillbootupin16bitrealmode,繼續(xù),返回,BIOSbackgroundFlaws(cont.),Itisinaccessibletoboot64bitssystemwhichstillcallinto16bitlegacyfirmwarewhenItaniumprocessorfamilycomeintolife.Moreandmorenewtechnologycomeout,likeVT,LTetc.Itisveryhardtoenablethosetechnologyinthewholeeco-systemquicklyinlegacyBIOSArchitectureindependentisthekeyforthenextgenerationBIOS,thatiswheretheEFIcomefrom,singledrivercanworkinx86,ItaniumandXScaleetc.,繼續(xù),返回,BIOSbackgroundFlaws(cont.),Code,RealMode,Assembler,Spaghetti,Scalability,Complexity,Maintenance,Issue,Spec,None!,Compatibility,OSLoader,TiedtoHWandBIOS,Slowsinnovation,Carrieslegacy,繼續(xù),返回,BIOSbackgroundChange,UnifiedExtensibleFirmwareInterfaceUEFIisaninterfacespecification-downloadfromwww.uefi.orgAbstractstheplatformfromOSIncludesamodulardrivermodelandCPU-independentoptionROMsCompatiblebydesignModularandextensibleComplementsexistinginterfaces,Flexibletomeetexistingandfutureneeds,OSLoader,Hardware,Firmware,UEFI,繼續(xù),返回,BIOSbackgroundChange,Code,RealMode,Assembler,Spaghetti,Scaleability,Complexity,Maintenance,Issue,Spec,None!,Compatibility,OSLoader,TiedtoHWandBIOS,Slowsinnovation,Carrieslegacy,