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Fujitsu Fujitsu SPARC64 V Errorstate, REDstate Trap Table, REDstate Execution Environment

Models: Fujitsu SPARC64 V

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7.1.1RED_state

RED_state Trap Table

The RED_state trap vector is located at an implementation-dependent address referred to as RSTVaddr. The value of RSTVaddr is a constant within each implementation; in SPARC64 V this virtual address is FFFF FFFF F000 000016, which translates to physical address 0000 07FF F000 000016 in RED_state (impl. dep. #114).

RED_state Execution Environment

In RED_state, the processor is forced to execute in a restricted environment by overriding the values of some processor controls and state registers.

Note – The values are overridden, not set, allowing them to be switched atomically.

SPARC64 V has the following implementation-dependent behavior in RED_state (impl. dep. #115):

■While in RED_state, all internal ITLB-based translation functions are disabled. DTLB-based translations are disabled upon entry but may be reenabled by software while in RED_state. However, ASI-based access functions to the TLBs are still available.

■While mTLBs and uTLBs are disabled, all accesses are assumed to be noncacheable and strongly ordered for data access.

■XIR errors are not masked and can cause a trap.

Note – When RED_state is entered because of component failures, the handler should attempt to recover from potentially catastrophic error conditions or to disable the failing components. When RED_state is entered after a reset, the software should create the environment necessary to restore the system to a running state.

7.1.2error_state

The processor enters error_state when a trap occurs while the processor is already at its maximum supported trap level (that is, when TL = MAXTL) (impl. dep. #39).

36 SPARC JPS1 Implementation Supplement: Fujitsu SPARC64 V • Release 1.0, 1 July 2002

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Fujitsu Fujitsu SPARC64 V manual Errorstate, REDstate Trap Table, REDstate Execution Environment

Contents

Sparc JPS1 Release 1.0, 1 July Chapter Page Contents Traps InstructionsImplementation Dependencies Sparc JPS1 Implementation-Dependent TrapsMemory Models Level-1 Instruction Cache L1I Cache Cache Organization 125 Cache TypesFatal Error Reset, REDstate, and errorstate 137 Reset TypesError Handling 149 Error Classification Asistchgerrorinfo Index UPA Programmer’s ModelGeneral References Page Fonts and Notational Conventions OverviewNavigating the SPARC64 V Implementation Supplement High Reliability and High Integrity SPARC64 V processorMicroarchitecture for High Performance High IntegrationExtended RAS interface to software Advanced RAS features for cachesAdvanced RAS features for the core Component Overview Asynchronous data error ADE trap for additional errorsSX-Unit 2Execution Unit Major Blocks Instruction Control Unit IUExecution Unit EU 1Instruction Control Unit Major BlocksStorage Unit Major Blocks Storage Unit SU4Secondary Cache and External Access Unit Major Blocks Secondary Cache and External Access Unit SXUInstruction dispatch Synonym instruction initiation DefinitionsIssue-stalling Sync Synonym machine sync Page Architectural Overview Page Please refer to , Data Formats in Commonality Data FormatsPage Nonprivileged Registers RegistersFSRfloating-pointtraptype ftt Floating-Point State Register FSRFSRnonstandardfp NS FSRversion verFSR Conformance Privileged RegistersTick Tick Register Trap State Tstate Register1shows the values for the VER register for SPARC64 Version VER RegisterAncillary State Registers ASRs Performance Control Register PCR ASROvro OVFDispatch Control Register DCR ASR Accessibility as described above impl. dep. #250Registers Referenced Through ASIs Performance Instrumentation Counter PIC Register ASRVM70 PM70Instruction Trap Register Floating-Point Deferred-Trap Queue FQIU Deferred-Trap Queue Data Watchpoint RegistersData Prefetch InstructionsInstruction Execution Instruction Prefetch 1SPARC64 V Syncing Instructions Syncing InstructionsYes Instruction Formats and Fields2Instruction Fields Specific to SPARC64 Control transfer CTI Instruction CategoriesControl-Transfer Instructions CTIs Call and Jmpl InstructionsImplementation-Dependent Instructions Floating-Point Operate FPop InstructionsInstruction Fetch Stages Processor PipelineBrhis Execution Stages Issue StagesCompletion Stages Execution Stages for Cache AccessPlease refer to .1 of Commonality TrapsProcessor States, Normal and Special Traps REDstate Execution Environment ErrorstateREDstate REDstate Trap TableUses of the Trap Categories Reset TrapsTrap Categories Deferred TrapsTrap Type TT Trap ControlTrap-Table Entry Addresses PIL ControlSparc JPS1 Implementation-Dependent Traps Trap ProcessingException and Interrupt Descriptions Details of Supported TrapsPage Sparc V9 Memory Model on Memory ModelsSynchronizing Instruction and Data Memory Mode ControlOverview Sparc V9 Memory ModelRelease 1.0, 1 July Memory Models Page Table A-1Implementation-Specific Instructions Instruction Definitions SPARC64 V ExtensionsPage Block Load and Store Instructions VIS Invalid Valid Implementation-Dependent Instructions Call and LinkFormat Floating-Point Multiply-Add/SubtractPage Operation, and inexact, respectively Non-Trapping cexc When FSR.NS =Non-Trapping aexc When FSR.NS = Jump and Link Exceptions fpdisabledFormat 3 Ldda Load Quadword, Atomic PhysicalMemory Barrier Bits in the cmask Field Order Constraints Imposed by mmask Bits01816 Partial Store VISPrefetch Data Table A-7Prefetch Variants Read State RegisterTable A-7describes prefetch variants implemented in SPARC64 Store Barrier Write State RegisterDeprecated Instructions Page Traps Inhibiting Results Floating-Point Nonstandard ModeIeee Std 754-1985 Requirements for Fpexceptionother Exception ftt=unfinishedFPop UnfinishedFPop Boundary Conditions Denormalized number, eres is less than zeroGenerates an unfinishedFPop exception Table B-2unfinishedFPop Boundary Conditions Pessimistic ZeroTable B-4Pessimistic Overflow Conditions Operation Under FSR.NS =Pessimistic Overflow Table B-3Conditions for a Pessimistic ZeroUnfinishedFPop4 Floating-Point Exceptional Conditions and ResultsYes and op2 Nv, dNaN Nonarithmetic Operations Under FSR.NS =Page Please refer to Section C.1 of Commonality Implementation DependenciesDefinition of an Implementation Dependency Please refer to Section C.2 of Commonality Hardware CharacteristicsImplementation Dependency Categories List of Implementation DependenciesTable C-1SPARC64 V Implementation Dependencies Deferred traps Reset trapEntering errorstate on implementation-dependent errors Errorstate processor stateFloating-point underflow detection Data access FPU trapClean windows trap Flush instructionUnimplemented LDD trap SIRenable control flagMMU disabled prefetch behavior IMPDEPn instructionsImplementation-dependent memory model Implicit ASI when TLUnimplemented values for PSTATE.MM Coherence and atomicity of memory operationsTable C-1SPARC64 V Implementation Dependencies 7 Table C-1SPARC64 V Implementation Dependencies 8 Table C-1SPARC64 V Implementation Dependencies 9 Table C-1SPARC64 V Implementation Dependencies 10 258 255256 257Please refer to Appendix D of Commonality Formal Specification of the Memory ModelsPage Instruction65 Opcode MapsPage Virtual Address Translation Memory Management UnitTable F-1Organization of SPARC64 V TLBs Translation Table Entry TTERelease 1.0, 1 July Chapter F Memory Management Unit TSB Pointer Formation TSB OrganizationTSB Pointer Formation TLB miss 64 16-67 Faults and TrapsInstructionaccessexception Reset, Disable, and REDstate Behavior Asimcntl Memory Control Register Accessing MMU RegistersAccess Modes Supervisor read/write Internal Registers and ASI operationsJPS1TSBP 10.4 I/D TLB Data In, Data Access, and Tag Read RegistersTable F-3MCNTL Field Description RMDPage TLB# Table F-4MMU TLB Data Access Address AssignmentKbyte page entry MMU TLB Tag Access RegisterTSB Base Registers 10.9 I/D Synchronous Fault Status Registers I-SFSR, D-SFSRMMU I/D Synchronous Fault Status Registers I-SFSR, D-SFSR 10.7 I/D TSB Extension RegistersEID Table F-5I-SFSRBit DescriptionSFSRBit Description FT60 Error DescriptionTable F-6describes the field encoding for ISFSR.FT Table F-8D-SFSRBit Description 1 Isfsr Update PolicyTable F-8D-SFSRBit Description 2 SFSRBit Description 3 Table F-9defines the encoding of the FT60 fieldFresh fault or miss3 MMU Synchronous Fault Status Register FT Fault Type FieldDsfsr Update Policy Table F-11Bypass Attribute Bits on SPARC64 Table F-10DSFSR Update PolicyMMU Bypass KbytesRestriction of sTLB Entry Direct Replacement TLB Replacement PolicyAutomatic TLB Replacement Rule Page Please refer to Appendix G of Commonality Assembly Language SyntaxPage Please refer to Appendix H of Commonality Software ConsiderationsPage Please refer to Appendix I of Commonality Extending the Sparc V9 ArchitecturePage Please refer to Appendix K of Commonality Changes from Sparc V8 to SparcPage Please refer to Appendix J of Commonality Programming with the Memory ModelsPage SPARC64 V ASI Assignments 1 Address Space IdentifiersSPARC64 V ASI Assignments TBD SPARC64 V ASI Assignments 2SPARC64 V ASI Assignments 3 Special Memory Access ASIsPartial Store ASIs Block Load and Store ASIsHigh-Speed Lbsy Read Mechanism Barrier Assist for Parallel ProcessingInterface Definition Lbsy Control Register ASICLBSYR0, ASICLBSYR1 ASI RegistersHigh-Speed BST Write Mechanism Bstw Busy Status Register Asicbstwbusy Bstw Control Register ASICBSTW0, ASICBSTW1Read Write is ignored Last Barrier Synchronization Status Read ASILBSYR0Barrier State Write ASIBSTW0, ASIBSTW1 EF16Cache Types Cache OrganizationLevel-1 Instruction Cache L1I Cache Table M-1L1I Cache CharacteristicsLevel-2 Unified Cache L2 Cache Table M-2L1D Cache CharacteristicsTable M-3L2 Cache Characteristics Level-1 Data Cache L1D CacheTable M-5L2 Cache Moesi States Cache Coherency ProtocolsCache Control/Status Instructions Table M-4Relationships Between Cache Coherency ProtocolsASIFLUSHL1I Flush Level-1 Instruction CacheTable M-6ASIL2CTRL Register Bits 3 L2 Diagnostics Tag ReadLevel-2 Cache Control Register ASIL2CTRL ASIL2DIAGTAGREADREG 4 L2 Diagnostics Tag Read RegistersPage Interrupt Dispatch Interrupt HandlingMembar Figure N-2is an example of the interrupt receive flow Interrupt ReceiveInterrupt Vector Dispatch Status Register Interrupt Global RegistersInterrupt-Related ASR Registers Interrupt Vector Dispatch RegisterAppendix contains these sections Reset, REDstate, and errorstateReset Types Power-on Reset PORSoftware-Initiated Reset SIR Watchdog Reset WDRExternally Initiated Reset XIR Figure O-1illustrates the processor state transition diagram REDstate and errorstatePA = 000007FFF000000016 Floating Point registers Processor State after Reset and in REDstateCPU Fatal Error state Integer registersMask dependent TBA6315Counter Table O-2ASR State after Reset and in REDstateASI Register State After Reset and in REDstate 1 Others ASI Register State After Reset and in REDstate 2ASI Register State After Reset and in REDstate 3 11011 Unchanged Operating Status Register OpsrTo be defined later Hardware Power-On Reset SequenceFirmware Initialization Sequence Page Fatal Error Error HandlingError Classification Instruction-Obstructing Error Errorstate Transition ErrorUrgent Error Urgent Error Independent of Instruction Execution Correctable Error CE, corrected by hardware Restrainable ErrorTraps for Urgent Errors Table P-1Registers Related to Error Handling Action and Error ControlRegisters Related to Error Handling Following registers are related to the error handlingTable P-2Action Upon Detection of an Error 1 Summary of Actions Upon Error DetectionTable P-2summarizes what happens when an error is detected Deviation in SPARC64 Table P-2Action Upon Detection of an Error 2Ideal specification Table P-2Action Upon Detection of an Error Error Marking for Cacheable Data Error Marking for Cacheable Data ErrorTable P-4Format of Error-Marked Data Format of Error-Marking DataTable P-3Syndrome for Data Marked for Error Table P-5ERRORMARKID Bit Description Table P-6shows the Errormarkid set by the CPUTable P-7Error Marking on SPARC64 IV and SPARC64 Difference Between Error Marking on SPARC64 IVRteue Control of Error Action AsierrorcontrolValue in ASIERRORCONTROL, as defined in Table P-9 Table P-8 Asieidr Bit DescriptionUgehandler WeakedAlways 0 Eeother Fatal Error and errorstate Transition ErrorTable P-10Format of Asistchgerrorinfo Bit Description 4C16Current SPARC64 V implementation Fatal Error TypesTypes of errorstate Transition Errors Table P-11ASIUGESR Bit Description 1 Urgent ErrorIdeal specification not implemented Table P-11ASIUGESR Bit Description 2 Table P-11ASIUGESR Bit Description 3 Instend Priv Mugedae Mugeiae Mugeiuge Action of asyncdataerror ADE TrapConditions that cause ADE trap Table P-11ASIUGESR Bit Description 4State transition Set the specific register settingFollowing three sets of registers are updated Following actions are executed in this orderInstend Update of ASIUGESR, as shown in Table P-13Instruction End-Method at ADE Trap Upon completion of a Retry or Done instructionExpected Software Handling of ADE Trap Void ExpectedsoftwarehandlingofADEtrap See Appendix F, Memory Management Unit, for details Instruction Access ErrorsData Access Errors Asiasyncfaultstatus Asiafsr Restrainable ErrorsCeincomed DGL1$U2$STLBImplementation Deviation SPARC64 V sets UedstbetoUERAWL2$FILL UERAWL2$INSDWAY ContentsSyndrome ASIASYNCFAULTADDRU2 register is described in Table P-17Contents of PABIT423 Expected Software Handling of Restrainable ErrorsPage Terminology used in Table P-18is defined as follows Handling of Internal Register ErrorsRegister Error Handling Excluding ASRs and ASI Registers Table P-18shows error handling for most registersADE trap, W ASR Error HandlingTable P-19shows the handling of ASR errors Table P-19ASR Error HandlingParity Always ASI Register Error HandlingError Protect Terminology used in Table P-20is defined as followsError Detect Condition Correction Error TypeTable P-20Handling of ASI Register Errors Table P-20shows the handling of ASI register errorsTable P-20Handling of ASI Register Errors Error in D1 Cache Tag and I1 Cache Tag Cache Error HandlingHandling of a Cache Tag Error SPARC64 V Implementation and the Ideal SpecificationError in U2 Unified Level 2 Cache Tag Correctable Error in D1 Cache Data Handling of an I1 Cache Data ErrorHandling of a D1 Cache Data Error Marked Uncorrectable Error in D1 Cache Data Raw Uncorrectable Error in U2 Cache Data Handling of a U2 Cache Data ErrorCorrectable Error in U2 Cache Data Marked Uncorrectable Error in U2 Cache DataI1 Cache Way Reduction Automatic Way Reduction of I1 Cache, D1 Cache, and U2 CacheWay Reduction Condition U2 Cache Way Reduction D1 Cache Way ReductionTable P-22Error Protection and Detection of TLB Entries TLB Error HandlingHandling of TLB Entry Errors Error in TLB Entry Detected on Ldxa Instruction AccessAutomatic Way Reduction of sTLB STLB Way Reduction Handling of Extended UPA Bus Interface ErrorHandling of Extended UPA Address Bus Error Handling of Extended UPA Data Bus ErrorCorrectable Error on Extended UPA Data Bus UE in Outgoing Data to Extended UPA Data Bus Page Counter Clear/Set Performance InstrumentationPerformance Monitor Overview Sample PseudocodesCounter Stop and Read Counter Event Selection and StartTable Q-1Events and Encoding of Performance Monitor Performance Monitor DescriptionEvents and Encoding of Performance Monitor Instruction StatisticsCounts the committed Floating Multiply-and-Add instructions Instruction Count instructioncountsTrap-Related Statistics Counts the occurrences of data uTLB misses MMU Event CountersCounts the occurrences of Tcc instructions Counts the occurrences of instruction uTLB missesCounts the total latency of I1 cache misses Cache Event CountersCounts the occurrences of I1 cache misses Counts the occurrences of D1 cache missesCounts L2 cache references by demand read access Counts the occurrences of L2 cache miss by demand accessCounts the number of Scpbreq packets received UPA Event CountersCounts the number of Sinvreq packets received Counts the number of Scpireq packets receivedBarrier-Assist ASI Read Count asirdbar Miscellaneous CountersPage Table R-1CPU’s UPA Port Slave Area Mapping UPA Programmer’s ModelMapping of the CPU’s UPA Port Slave Area Table R-1shows the mapping of the CPU’s UPA port slave areaTable R-2UPA PortID Register Fields UPA PortID RegisterUpacap UPA Config RegisterTable R-3UPA Config Register Description UPA PortID Register FieldsUPA Config Register Description Upccap PconUPCCAP2 MIDPage SPARC64 V and UltraSPARC-III Differences 1 Summary of Differences between SPARC64 V and UltraSPARC-IIIUPA Table T-1SPARC64 V and UltraSPARC-III Differences 2Sfsr Table T-1SPARC64 V and UltraSPARC-III Differences 3Page Please refer to Bibliography in Commonality BibliographyGeneral References Page Auge IndexPage ASIINTRW133 Page DAE Error detection action155DGL1$L2$STLB error194 DGL1$U2$STLB error195 Dmmu On Jmpl instruction error53 update during MMU trap90Persistence38 ECCerror exception46, 153, 155Statistics monitoring206-207 FSR FQ17Immu Isfsr Update during MMU trap90PSO41 RMO41 Lddfa instruction80OBP Release 1.0, 1 July Chapter Index PTE Release 1.0, 1 July Chapter Index Page TLB UnimplementedFPop floating-point trap type70 UITLB10, 85, 90 uncorrectable error152Way reduction194 uDTLB10, 85