Syncing Instructions | Fujitsu Fujitsu SPARC64 V specs

6.1.3Syncing Instructions

SPARC64 V has instructions, called syncing instructions, that stop execution for the number of cycles it takes to clear the pipeline and to synchronize the processor. There are two types of synchronization, pre and post. A presyncing instruction waits for all previous instructions to commit, commits by itself, and then issues successive instructions. A postsyncing instruction issues by itself and prevents the successive instructions from issuing until it is committed. Some instructions have both pre- and postsync attributes.

In SPARC64 V almost all instructions commit in order, but store instruction commit before becoming globally visible. A few syncing instructions cause the processor to discard prefetched instructions and to refetch the successive instructions. TABLE 6-1lists all pre-/postsync instructions and the effects of instruction execution.

TABLE 6-1SPARC64 V Syncing Instructions

		Presyncing			Postsyncing

Opcode			Wait for			Discard
Opcode	Sync?		store global	Sync?		prefetched
	Sync?		store global	Sync?		prefetched
			visibility?			instructions?

ALIGNADDRESS{_LITTLE}				Yes
BMASK				Yes
DONE				Yes		Yes
FCMP(GT,LE,NE,EQ)(16,32)	Yes
FLUSH	Yes			Yes		Yes
FMOV(s,d)icc	Yes
FMOVr	Yes
LDD	Yes			Yes
LDDA	Yes			Yes
LDDFA	Yes
memory access with	Yes
ASI=ASI_PHYS_BYPASS_EC{_LITTLE},
ASI_PHYS_BYPASS_EC_WITH_E_BIT{_LITTLE}
LDFSR, LDXFSR				Yes
MEMBAR	Yes		Yes1	Yes
MOVfcc	Yes
MULScc	Yes
PDIST				Yes
RDASR	Yes
RETRY				Yes		Yes
SIAM				Yes
STBAR	Yes
STD	Yes

Release 1.0, 1 July 2002

F. Chapter 6 Instructions 27

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Fujitsu Fujitsu SPARC64 V manual 1SPARC64 V Syncing Instructions

Contents

Sparc JPS1 Release 1.0, 1 July Chapter Page Contents Instructions Traps Implementation Dependencies Sparc JPS1 Implementation-Dependent TrapsMemory Models Cache Organization 125 Cache Types Level-1 Instruction Cache L1I Cache Fatal 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 Integration SPARC64 V processorMicroarchitecture for High Performance High Reliability and High Integrity Extended RAS interface to software Advanced RAS features for cachesAdvanced RAS features for the core Asynchronous data error ADE trap for additional errors Component Overview SX-Unit 1Instruction Control Unit Major Blocks Instruction Control Unit IUExecution Unit EU 2Execution Unit Major Blocks Storage Unit SU Storage Unit Major Blocks Secondary Cache and External Access Unit SXU 4Secondary Cache and External Access Unit Major Blocks Definitions Instruction dispatch Synonym instruction initiation Issue-stalling Sync Synonym machine sync Page Architectural Overview Page Data Formats Please refer to , Data Formats in CommonalityPage Registers Nonprivileged Registers FSRversion ver Floating-Point State Register FSRFSRnonstandardfp NS FSRfloating-pointtraptype ftt Trap State Tstate Register Privileged RegistersTick Tick Register FSR Conformance Performance Control Register PCR ASR Version VER RegisterAncillary State Registers ASRs 1shows the values for the VER register for SPARC64 OVF Ovro Performance Instrumentation Counter PIC Register ASR Accessibility as described above impl. dep. #250Registers Referenced Through ASIs Dispatch Control Register DCR ASR PM70 VM70 Data Watchpoint Registers Floating-Point Deferred-Trap Queue FQIU Deferred-Trap Queue Instruction Trap Register Data Prefetch InstructionsInstruction Execution Instruction Prefetch Syncing Instructions 1SPARC64 V Syncing Instructions Yes Instruction Formats and Fields2Instruction Fields Specific to SPARC64 Call and Jmpl Instructions Instruction CategoriesControl-Transfer Instructions CTIs Control transfer CTI Floating-Point Operate FPop Instructions Implementation-Dependent Instructions Processor Pipeline Instruction Fetch Stages Brhis Issue Stages Execution Stages Execution Stages for Cache Access Completion Stages Please refer to .1 of Commonality TrapsProcessor States, Normal and Special Traps REDstate Trap Table ErrorstateREDstate REDstate Execution Environment Deferred Traps Reset TrapsTrap Categories Uses of the Trap Categories PIL Control Trap ControlTrap-Table Entry Addresses Trap Type TT Details of Supported Traps Trap ProcessingException and Interrupt Descriptions Sparc JPS1 Implementation-Dependent TrapsPage Memory Models Sparc V9 Memory Model on Sparc V9 Memory Model Mode ControlOverview Synchronizing Instruction and Data Memory Release 1.0, 1 July Memory Models Page Instruction Definitions SPARC64 V Extensions Table A-1Implementation-Specific InstructionsPage Block Load and Store Instructions VIS Invalid Valid Call and Link Implementation-Dependent Instructions Floating-Point Multiply-Add/Subtract FormatPage Operation, and inexact, respectively Non-Trapping cexc When FSR.NS =Non-Trapping aexc When FSR.NS = Exceptions fpdisabled Jump and Link Load Quadword, Atomic Physical Format 3 Ldda Memory Barrier Order Constraints Imposed by mmask Bits Bits in the cmask Field 01816 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 Pessimistic Zero Table B-2unfinishedFPop Boundary Conditions Table B-3Conditions for a Pessimistic Zero Operation Under FSR.NS =Pessimistic Overflow Table B-4Pessimistic Overflow Conditions Floating-Point Exceptional Conditions and Results UnfinishedFPop4 Nonarithmetic Operations Under FSR.NS = Yes and op2 Nv, dNaNPage Please refer to Section C.1 of Commonality Implementation DependenciesDefinition of an Implementation Dependency List of Implementation Dependencies Hardware CharacteristicsImplementation Dependency Categories Please refer to Section C.2 of Commonality Table C-1SPARC64 V Implementation Dependencies Errorstate processor state Reset trapEntering errorstate on implementation-dependent errors Deferred traps Flush instruction Data access FPU trapClean windows trap Floating-point underflow detection IMPDEPn instructions SIRenable control flagMMU disabled prefetch behavior Unimplemented LDD trap Coherence and atomicity of memory operations Implicit ASI when TLUnimplemented values for PSTATE.MM Implementation-dependent memory model Table 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 10 257 255256 258 Formal Specification of the Memory Models Please refer to Appendix D of CommonalityPage Opcode Maps Instruction65Page Memory Management Unit Virtual Address Translation Translation Table Entry TTE Table F-1Organization of SPARC64 V TLBs Release 1.0, 1 July Chapter F Memory Management Unit TSB Pointer Formation TSB OrganizationTSB Pointer Formation Faults and Traps TLB miss 64 16-67 Instructionaccessexception Reset, Disable, and REDstate Behavior Internal Registers and ASI operations Accessing MMU RegistersAccess Modes Supervisor read/write Asimcntl Memory Control Register RMD 10.4 I/D TLB Data In, Data Access, and Tag Read RegistersTable F-3MCNTL Field Description JPS1TSBPPage Table F-4MMU TLB Data Access Address Assignment TLB# MMU TLB Tag Access Register Kbyte page entry 10.7 I/D TSB Extension Registers 10.9 I/D Synchronous Fault Status Registers I-SFSR, D-SFSRMMU I/D Synchronous Fault Status Registers I-SFSR, D-SFSR TSB Base Registers Table F-5I-SFSRBit Description EID SFSRBit Description FT60 Error DescriptionTable F-6describes the field encoding for ISFSR.FT Isfsr Update Policy Table F-8D-SFSRBit Description 1 Table F-8D-SFSRBit Description 2 Table F-9defines the encoding of the FT60 field SFSRBit Description 3 Fresh fault or miss3 MMU Synchronous Fault Status Register FT Fault Type FieldDsfsr Update Policy Kbytes Table F-10DSFSR Update PolicyMMU Bypass Table F-11Bypass Attribute Bits on SPARC64 Restriction of sTLB Entry Direct Replacement TLB Replacement PolicyAutomatic TLB Replacement Rule Page Assembly Language Syntax Please refer to Appendix G of CommonalityPage Software Considerations Please refer to Appendix H of CommonalityPage Extending the Sparc V9 Architecture Please refer to Appendix I of CommonalityPage Changes from Sparc V8 to Sparc Please refer to Appendix K of CommonalityPage Programming with the Memory Models Please refer to Appendix J of CommonalityPage SPARC64 V ASI Assignments 1 Address Space IdentifiersSPARC64 V ASI Assignments SPARC64 V ASI Assignments 2 TBD Special Memory Access ASIs SPARC64 V ASI Assignments 3 Block Load and Store ASIs Partial Store ASIs High-Speed Lbsy Read Mechanism Barrier Assist for Parallel ProcessingInterface Definition Lbsy Control Register ASICLBSYR0, ASICLBSYR1 ASI RegistersHigh-Speed BST Write Mechanism Bstw Control Register ASICBSTW0, ASICBSTW1 Bstw Busy Status Register Asicbstwbusy EF16 Last Barrier Synchronization Status Read ASILBSYR0Barrier State Write ASIBSTW0, ASIBSTW1 Read Write is ignored Cache Organization Cache Types Table M-1L1I Cache Characteristics Level-1 Instruction Cache L1I Cache Level-1 Data Cache L1D Cache Table M-2L1D Cache CharacteristicsTable M-3L2 Cache Characteristics Level-2 Unified Cache L2 Cache Table M-4Relationships Between Cache Coherency Protocols Cache Coherency ProtocolsCache Control/Status Instructions Table M-5L2 Cache Moesi States Flush Level-1 Instruction Cache ASIFLUSHL1I Table M-6ASIL2CTRL Register Bits 3 L2 Diagnostics Tag ReadLevel-2 Cache Control Register ASIL2CTRL 4 L2 Diagnostics Tag Read Registers ASIL2DIAGTAGREADREGPage Interrupt Handling Interrupt Dispatch Membar Interrupt Receive Figure N-2is an example of the interrupt receive flow Interrupt Vector Dispatch Register Interrupt Global RegistersInterrupt-Related ASR Registers Interrupt Vector Dispatch Status Register Power-on Reset POR Reset, REDstate, and errorstateReset Types Appendix contains these sections Software-Initiated Reset SIR Watchdog Reset WDRExternally Initiated Reset XIR REDstate and errorstate Figure O-1illustrates the processor state transition diagram PA = 000007FFF000000016 Integer registers Processor State after Reset and in REDstateCPU Fatal Error state Floating Point registers TBA6315 Mask dependent Counter Table O-2ASR State after Reset and in REDstateASI Register State After Reset and in REDstate 1 ASI Register State After Reset and in REDstate 2 Others ASI Register State After Reset and in REDstate 3 Operating Status Register Opsr 11011 Unchanged To 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 Following registers are related to the error handling Action and Error ControlRegisters Related to Error Handling Table P-1Registers Related to Error Handling Table 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 Error Marking for Cacheable Data Table P-4Format of Error-Marked Data Format of Error-Marking DataTable P-3Syndrome for Data Marked for Error Table P-6shows the Errormarkid set by the CPU Table P-5ERRORMARKID Bit Description Difference Between Error Marking on SPARC64 IV Table P-7Error Marking on SPARC64 IV and SPARC64 Table P-8 Asieidr Bit Description Control of Error Action AsierrorcontrolValue in ASIERRORCONTROL, as defined in Table P-9 Rteue Weaked Ugehandler 4C16 Fatal Error and errorstate Transition ErrorTable P-10Format of Asistchgerrorinfo Bit Description Always 0 Eeother Current 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 Table P-11ASIUGESR Bit Description 4 Action of asyncdataerror ADE TrapConditions that cause ADE trap Instend Priv Mugedae Mugeiae Mugeiuge Following actions are executed in this order Set the specific register settingFollowing three sets of registers are updated State transition Upon completion of a Retry or Done instruction Update of ASIUGESR, as shown in Table P-13Instruction End-Method at ADE Trap Instend Expected Software Handling of ADE Trap Void ExpectedsoftwarehandlingofADEtrap See Appendix F, Memory Management Unit, for details Instruction Access ErrorsData Access Errors Restrainable Errors Asiasyncfaultstatus Asiafsr DGL1$U2$STLB Ceincomed UERAWL2$INSD UedstbetoUERAWL2$FILL Implementation Deviation SPARC64 V sets Contents WAY ASIASYNCFAULTADDRU2 register is described in Table P-17 Syndrome Expected Software Handling of Restrainable Errors Contents of PABIT423Page Table P-18shows error handling for most registers Handling of Internal Register ErrorsRegister Error Handling Excluding ASRs and ASI Registers Terminology used in Table P-18is defined as follows Table P-19ASR Error Handling ASR Error HandlingTable P-19shows the handling of ASR errors ADE trap, W Terminology used in Table P-20is defined as follows ASI Register Error HandlingError Protect Parity Always Error Detect Condition Error Type Correction Table P-20shows the handling of ASI register errors Table P-20Handling of ASI Register Errors Table P-20Handling of ASI Register Errors SPARC64 V Implementation and the Ideal Specification Cache Error HandlingHandling of a Cache Tag Error Error in D1 Cache Tag and I1 Cache Tag Error 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 Marked Uncorrectable Error in U2 Cache Data Handling of a U2 Cache Data ErrorCorrectable Error in U2 Cache Data Raw Uncorrectable Error in U2 Cache Data I1 Cache Way Reduction Automatic Way Reduction of I1 Cache, D1 Cache, and U2 CacheWay Reduction Condition D1 Cache Way Reduction U2 Cache Way Reduction Error in TLB Entry Detected on Ldxa Instruction Access TLB Error HandlingHandling of TLB Entry Errors Table P-22Error Protection and Detection of TLB Entries Automatic Way Reduction of sTLB Handling of Extended UPA Data Bus Error Handling of Extended UPA Bus Interface ErrorHandling of Extended UPA Address Bus Error STLB Way Reduction Correctable Error on Extended UPA Data Bus UE in Outgoing Data to Extended UPA Data Bus Page Sample Pseudocodes Performance InstrumentationPerformance Monitor Overview Counter Clear/Set Counter Event Selection and Start Counter Stop and Read Performance Monitor Description Table Q-1Events and Encoding of Performance Monitor Instruction Statistics Events and Encoding of Performance Monitor Instruction Count instructioncounts Counts the committed Floating Multiply-and-Add instructions Trap-Related Statistics Counts the occurrences of instruction uTLB misses MMU Event CountersCounts the occurrences of Tcc instructions Counts the occurrences of data uTLB misses Counts the occurrences of D1 cache misses Cache Event CountersCounts the occurrences of I1 cache misses Counts the total latency of I1 cache misses Counts the occurrences of L2 cache miss by demand access Counts L2 cache references by demand read access Counts the number of Scpireq packets received UPA Event CountersCounts the number of Sinvreq packets received Counts the number of Scpbreq packets received Miscellaneous Counters Barrier-Assist ASI Read Count asirdbarPage Table R-1shows the mapping of the CPU’s UPA port slave area UPA Programmer’s ModelMapping of the CPU’s UPA Port Slave Area Table R-1CPU’s UPA Port Slave Area Mapping UPA PortID Register Table R-2UPA PortID Register Fields UPA PortID Register Fields UPA Config RegisterTable R-3UPA Config Register Description Upacap UPA Config Register Description MID PconUPCCAP2 UpccapPage Summary of Differences between SPARC64 V and UltraSPARC-III SPARC64 V and UltraSPARC-III Differences 1 Table T-1SPARC64 V and UltraSPARC-III Differences 2 UPA Table T-1SPARC64 V and UltraSPARC-III Differences 3 SfsrPage Please refer to Bibliography in Commonality BibliographyGeneral References Page Index AugePage ASIINTRW133 Page Error detection action155 DAE DGL1$L2$STLB error194 DGL1$U2$STLB error195 On Jmpl instruction error53 update during MMU trap90 Dmmu ECCerror exception46, 153, 155 Persistence38 Statistics monitoring206-207 FQ17 FSR Immu Update during MMU trap90 Isfsr Lddfa instruction80 PSO41 RMO41 OBP 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