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• Global_Descriptor_Table abstract "The Global Descriptor Table or GDT is a data structure used by Intel x86-family processors starting with the 80286 in order to define the characteristics of the various memory areas used during program execution, including the base address, the size and access privileges like executability and writability. These memory areas are called segments in Intel terminology.The GDT can hold things other than segment descriptors as well. Every 8-byte entry in the GDT is a descriptor, but these can be Task State Segment (or TSS) descriptors, Local Descriptor Table (LDT) descriptors, or Call Gate descriptors. The last ones, Call Gates, are particularly important for transferring control between x86 privilege levels although this mechanism is not used on most modern operating systems.There is also an LDT or Local Descriptor Table. The LDT is supposed to contain memory segments which are private to a specific program, while the GDT is supposed to contain global segments. The x86 processors contain facilities for automatically switching the current LDT on specific machine events, but no facilities for automatically switching the GDT.Every memory access which a program can perform always goes through a segment. On the 386 processor and later, because of 32-bit segment offsets and limits, it is possible to make segments cover the entire addressable memory, which makes segment-relative addressing transparent to the user.In order to reference a segment, a program must use its index inside the GDT or the LDT. Such an index is called a segment selector or selector in short. The selector must generally be loaded into a segment register to be used. Apart from the machine instructions which allow one to set/get the position of the GDT (and of the Interrupt Descriptor Table) in memory, every machine instruction referencing memory has an implicit Segment Register, occasionally two. Most of the time this Segment Register can be overridden by adding a Segment Prefix before the instruction.Loading a selector into a segment register automatically reads the GDT or the LDT and storesthe properties of the segment inside the processor itself. Subsequent modifications to the GDTor LDT will not be effective unless the segment register is reloaded.format of a segment descriptor".
• Global_Descriptor_Table thumbnail SegmentDescriptor.svg?width=300.
• Global_Descriptor_Table wikiPageExternalLink 24319202.pdf.
• Global_Descriptor_Table wikiPageExternalLink GDT_Tutorial.
• Global_Descriptor_Table wikiPageExternalLink Global_Descriptor_Table.
• Global_Descriptor_Table wikiPageExternalLink 4.-The%20GDT%20and%20IDT.html.
• Global_Descriptor_Table wikiPageExternalLink gdt.htm.
• Global_Descriptor_Table wikiPageID "4118872".
• Global_Descriptor_Table wikiPageLength "9395".
• Global_Descriptor_Table wikiPageOutDegree "34".
• Global_Descriptor_Table wikiPageRevisionID "706268942".
• Global_Descriptor_Table wikiPageWikiLink 16-bit.
• Global_Descriptor_Table wikiPageWikiLink 32-bit.
• Global_Descriptor_Table wikiPageWikiLink Address_space.
• Global_Descriptor_Table wikiPageWikiLink Call_gate.
• Global_Descriptor_Table wikiPageWikiLink Category:Memory_management.
• Global_Descriptor_Table wikiPageWikiLink Category:X86_architecture.
• Global_Descriptor_Table wikiPageWikiLink Fatal_system_error.
• Global_Descriptor_Table wikiPageWikiLink Global_Descriptor_Table.
• Global_Descriptor_Table wikiPageWikiLink Hooking.
• Global_Descriptor_Table wikiPageWikiLink Hypervisor.
• Global_Descriptor_Table wikiPageWikiLink Intel.
• Global_Descriptor_Table wikiPageWikiLink Intel_80286.
• Global_Descriptor_Table wikiPageWikiLink Intel_80386.
• Global_Descriptor_Table wikiPageWikiLink Interrupt_descriptor_table.
• Global_Descriptor_Table wikiPageWikiLink Kernel_(operating_system).
• Global_Descriptor_Table wikiPageWikiLink Memory_model_(programming).
• Global_Descriptor_Table wikiPageWikiLink 2.
• Global_Descriptor_Table wikiPageWikiLink Operating_system.
• Global_Descriptor_Table wikiPageWikiLink Protected_mode.
• Global_Descriptor_Table wikiPageWikiLink Segment_descriptor.
• Global_Descriptor_Table wikiPageWikiLink Shared_memory.
• Global_Descriptor_Table wikiPageWikiLink Task_state_segment.
• Global_Descriptor_Table wikiPageWikiLink VMware.
• Global_Descriptor_Table wikiPageWikiLink Windows_NT.
• Global_Descriptor_Table wikiPageWikiLink Windows_on_Windows.
• Global_Descriptor_Table wikiPageWikiLink X86.
• Global_Descriptor_Table wikiPageWikiLink X86_memory_segmentation.
• Global_Descriptor_Table wikiPageWikiLink File:SegmentDescriptor.svg.
• Global_Descriptor_Table wikiPageWikiLinkText "GDT".
• Global_Descriptor_Table wikiPageWikiLinkText "Global Descriptor Table (GDT)".
• Global_Descriptor_Table wikiPageWikiLinkText "Global Descriptor Table".
• Global_Descriptor_Table wikiPageWikiLinkText "Global Descriptor Table#Local Descriptor Table".
• Global_Descriptor_Table wikiPageUsesTemplate Template:Citation_style.
• Global_Descriptor_Table wikiPageUsesTemplate Template:Lead_too_long.
• Global_Descriptor_Table wikiPageUsesTemplate Template:Multiple_issues.
• Global_Descriptor_Table wikiPageUsesTemplate Template:Technical.
• Global_Descriptor_Table wikiPageUsesTemplate Template:Unreferenced_section.
• Global_Descriptor_Table subject Category:Memory_management.
• Global_Descriptor_Table subject Category:X86_architecture.
• Global_Descriptor_Table hypernym Structure.
• Global_Descriptor_Table type Building.
• Global_Descriptor_Table type Page.
• Global_Descriptor_Table type Product.
• Global_Descriptor_Table type Redirect.
• Global_Descriptor_Table comment "The Global Descriptor Table or GDT is a data structure used by Intel x86-family processors starting with the 80286 in order to define the characteristics of the various memory areas used during program execution, including the base address, the size and access privileges like executability and writability. These memory areas are called segments in Intel terminology.The GDT can hold things other than segment descriptors as well.".
• Global_Descriptor_Table label "Global Descriptor Table".
• Global_Descriptor_Table sameAs Q1518013.
• Global_Descriptor_Table sameAs Global_Descriptor_Table.
• Global_Descriptor_Table sameAs Global_Descriptor_Table.
• Global_Descriptor_Table sameAs Global_Descriptor_Table.
• Global_Descriptor_Table sameAs m.0bk3w1.
• Global_Descriptor_Table sameAs GDT.
• Global_Descriptor_Table sameAs Q1518013.
• Global_Descriptor_Table wasDerivedFrom Global_Descriptor_Table?oldid=706268942.
• Global_Descriptor_Table depiction SegmentDescriptor.svg.
• Global_Descriptor_Table isPrimaryTopicOf Global_Descriptor_Table.