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1、32位系统与内存限制(32bitsystemandmemorylimit)Inthefollowing,agreedDirectaddressingsaidOSandapplicationswithoutadditionalconversionanddirectaccesstothephysicaladdress,Physicaladdressing(planeaddressing)saidprocessorthroughalltheaddresslinetophysicaladdressaccess,VirtualaddressingsaidOSan
2、dapplicationafterpagemanagementmechanismafterconversionofvirtualmemoryaccess,Extendedsaidindirectaccesstophysicaladdressspaceforhigh-endprocessorbeyondthedirectaddressingability・ThephysicaladdressincludingRAM,ROM,AGP/PCI/PCI-EaddressspaceTheaddressidentifiesasinglebyteinaspecifi
3、coperation,accesstoinformationmustbegiven,Ifthephysicaladdressis32words,onlythedirectmanagementof232Bytes=4GBphysicaladdressspace・PSE:PageSizeExtensionpagesizeextension,fromP5(Pentium)begantointroducethehardwaretechnology.PAE:PhysicalAddressExtensionphysicaladdressextension,more
4、advancedhardwaretechnology,FromP6(PentiumPro)isintroduced,issynonymouswiththe32bitextensionaddressing・VAS:VirtualAddressSpacevirtualaddressspace;VM:VirtualMemoryvirtualmemory,whichreferstotheOS/CPUpageinthemanagementofalllogicalstoragespace・Sometimessay〃aprocessofVASorVM,thatisp
5、artoftheprocessofallavailablespace・Pleasenotethedistinctionbetweenthetwoconceptsof"'virtualmemory"and，zswap/swapfile〃：Swap/swapfileisusedtostorepartoftheexternalstoragepartofthepageinavirtualmemory,Anotherpartofthepageinavirtualmemoryintheinternalmemory,whichisthephysicalmemory.
6、32bitoperatingsystembypagemanagementVAS,x86architectureusing4KB~4MBpagesize,If4MB,onlythe210pages4GB.(someoftheRISCsystemby16MBgiantpaging)However,givenonlythepagingnumberisnotsufficientfordirectaccesstoinformation,andtheneedtodotheconversion:Thefinaloronebyteofabytetothephysica
7、laddressspaceinthephysicaladdressingit.Thefirstpostedsomeoftheoldpost,asemifinishing,articleswrittenbyothers:Sender:Marion(curiosity?Itisonlythefirststepofscientificresearch!),letter:MSWindowsTitle:introducetheextendedaddressingWin32programReturn:PopCap(09December200621:16:08Sat
8、urday),thestationlettersWWWPOSTIfweonlydiscusst
