Geode GXLV Processor Series Low Power Integrated x86 Solutions
Geode GXLV Processor Series Low Power Integrated x86 Solutions
Geode GXLV Processor Series Low Power Integrated x86 Solutions
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Table of Contents (Continued)3.5 OFFSET,SEGMENT,ANDPAGINGMECHANISMS .............................643.5.1 Offset Mechanism . . . . . ............................................643.5.2 SegmentMechanisms ..............................................663.5.2.1 RealModeSegmentMechanism .....................................663.5.2.2 Virtual8086ModeSegmentMechanism................................663.5.2.3 SegmentMechanisminProtectedMode................................673.5.2.4 SegmentSelectors ................................................673.5.3 Descriptors .......................................................703.5.3.1 GlobalandLocalDescriptorTableRegisters.............................703.5.3.2 SegmentDescriptors ...............................................703.5.3.3 Task, Gate, Interrupt, and Application and System Descriptors . . . . . . . . . . . . . . 713.5.4 PagingMechanism.................................................773.6 INTERRUPTSANDEXCEPTIONS ...........................................793.6.1 Interrupts ........................................................793.6.2 Exceptions .......................................................793.6.3 InterruptVectors ...................................................803.6.3.1 InterruptVectorAssignments.........................................803.6.3.2 InterruptDescriptorTable ...........................................803.6.4 InterruptandExceptionPriorities ......................................813.6.5 ExceptionsinRealMode ............................................823.6.6 ErrorCodes ......................................................823.7 SYSTEMMANAGEMENTMODE ............................................833.7.1 SMMOperation ...................................................843.7.2 SMI#Pin.........................................................853.7.3 SMMConfigurationRegisters ........................................853.7.4 SMMMemorySpaceHeader.........................................853.7.5 SMMInstructions ..................................................873.7.6 SMMMemorySpace ...............................................883.7.7 SMIGenerationforVirtualVGA .......................................883.7.8 SMMServiceRoutineExecution ......................................883.7.8.1 SMINesting ......................................................883.7.8.2 CPUStatesRelatedtoSMMandSuspendMode.........................903.8 HALTANDSHUTDOWN ...................................................913.9 PROTECTION ...........................................................913.9.1 PrivilegeLevels ...................................................913.9.2 I/OPrivilegeLevels ................................................913.9.3 PrivilegeLevelTransfers ............................................923.9.3.1 Gates ...........................................................933.9.4 InitializationandTransitiontoProtectedMode............................933.10 VIRTUAL8086MODE .....................................................933.10.1 MemoryAddressing ................................................933.10.2 Protection ........................................................933.10.3 Interrupt Handling . . . . . . ............................................933.10.4 EnteringandLeavingVirtual8086Mode................................933.11 FLOATINGPOINTUNITOPERATIONS .......................................943.11.1 FPURegisterSet ..................................................943.11.2 FPUTagWordRegister .............................................943.11.3 FPUStatusRegister ...............................................943.11.4 FPUModeControlRegister ..........................................94<strong>Geode</strong> <strong>GXLV</strong> <strong>Processor</strong> <strong>Series</strong>Revision 1.3 5 www.national.com