User manual INTEL CORE 2 DUO E8000 SPECIFICATION UPDATE 7-2010

[. . . ] Intel® CoreTM2 Duo Processor E8000 and E7000 Series Specification Update -- on 45 nm Process in the 775-land LGA Package July 2010 Notice: The Intel® CoreTM2 Duo processor may contain design defects or errors known as errata which may cause the product to deviate from published specifications. Current characterized errata are documented in this Specification Update. Document Number: 318733-018 INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL® PRODUCTS. NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. EXCEPT AS PROVIDED IN INTEL'S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, INTEL ASSUMES NO LIABILITY WHATSOEVER, AND INTEL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY, RELATING TO SALE AND/OR USE OF INTEL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. [. . . ] Problem: For the steppings affected, see the Summary Tables of Changes. CPUID Reports Architectural Performance Monitoring Version 2 is Supported, When Only Version 1 Capabilities are Available CPUID leaf 0Ah reports the architectural performance monitoring version that is available in EAX[7:0]. Due to this erratum CPUID reports the supported version as 2 instead of 1. Intel® CoreTM2 Duo Processor Specification Update 29 Errata Implication: Software will observe an incorrect version number in CPUID. 0Ah. EAX [7:0] in comparison to which features are actually supported. Workaround: Software should use the recommended enumeration mechanism described in the Architectural Performance Monitoring section of the Intel® 64 and IA-32 Architectures Software Developer's Manual, Volume 3: System Programming Guide. Problem: For the steppings affected, see the Summary Tables of Changes. B0-B3 Bits in DR6 For Non-Enabled Breakpoints May be Incorrectly Set Some of the B0-B3 bits (breakpoint conditions detect flags, bits [3:0]) in DR6 may be incorrectly set for non-enabled breakpoints when the following sequence happens: 1. MOV or POP instruction to SS (Stack Segment) selector; Next instruction is FP (Floating Point) that gets FP assist Another instruction after the FP instruction completes successfully A breakpoint occurs due to either a data breakpoint on the preceding instruction or a code breakpoint on the next instruction. Due to this erratum a non-enabled breakpoint triggered on step 1 or step 2 may be reported in B0-B3 after the breakpoint occurs in step 4. Implication: Due to this erratum, B0-B3 bits in DR6 may be incorrectly set for non-enabled breakpoints. Workaround: Software should not execute a floating point instruction directly after a MOV SS or POP SS instruction. Problem: For the steppings affected, see the Summary Tables of Changes. An xTPR Update Transaction Cycle, if Enabled, May be Issued to the FSB after the Processor has Issued a Stop-Grant Special Cycle According to the FSB (Front Side Bus) protocol specification, no FSB cycles should be issued by the processor once a Stop-Grant special cycle has been issued to the bus. If xTPR update transactions are enabled by clearing the IA32_MISC_ENABLES[bit 23] at the time of Stop-Clock assertion, an xTPR update transaction cycle may be issued to the FSB after the processor has issued a Stop Grant Acknowledge transaction. Implication: When this erratum occurs in systems using C-states C2 (Stop-Grant State) and higher the result could be a system hang. Workaround: BIOS must leave the xTPR update transactions disabled (default). Status: For the steppings affected, see the Summary Tables of Changes. 30 Intel® CoreTM2 Duo Processor Specification Update Errata AW37. Problem: Performance Monitoring Event IA32_FIXED_CTR2 May Not Function Properly when Max Ratio is a Non-Integer Core-to-Bus Ratio Performance Counter IA32_FIXED_CTR2 (MSR 30BH) event counts CPU reference clocks when the core is not in a halt state. This event is not affected by core frequency changes (e. g. , P states, TM2 transitions) but counts at the same frequency as the Time-Stamp Counter IA32_TIME_STAMP_COUNTER (MSR 10H). Due to this erratum, the IA32_FIXED_CTR2 will not function properly when the non-integer core-tobus ratio multiplier feature is used and when a non-zero value is written to IA32_ FIXED_CTR2. Non-integer core-to-bus ratio enables additional operating frequencies. This feature can be detected by IA32_PLATFORM_ID (MSR 17H) bit [23]. Implication: The Performance Monitoring Event IA32_FIXED_CTR2 may result in an inaccurate count when the non-integer core-to-bus multiplier feature is used. Workaround: If writing to IA32_FIXED_CTR2 and using a non-integer core-to-bus ratio multiplier, always write a zero. Problem: For the steppings affected, see the Summary Tables of Changes. Instruction Fetch May Cause a Livelock During Snoops of the L1 Data Cache A livelock may be observed in rare conditions when instruction fetch causes multiple level one data cache snoops. Implication: Due to this erratum, a livelock may occur. [. . . ] Due to this erratum, the VM exit may be delayed by one additional instruction. Implication: VMM software using "NMI-window exiting" for NMI virtualization should generally be unaffected, as the erratum causes at most a one-instruction delay in the injection of a virtual NMI, which is virtually asynchronous. The erratum may affect VMMs relying on deterministic delivery of the affected VM exits. For the steppings affected, see the Summary Tables of Changes. FP Data Operand Pointer May Be Incorrectly Calculated After an FP Access Which Wraps a 4-Gbyte Boundary in Code That Uses 32-Bit Address Size in 64-bit Mode The FP (Floating Point) Data Operand Pointer is the effective address of the operand associated with the last non-control FP instruction executed by the processor. [. . . ]