24
Specification Update
AAO13.
General Protection (#GP) Fault May Not Be Signaled on Data Segment
Limit Violation above 4-G Limit
Problem:
In 32-bit mode, memory accesses to flat data segments (base = 00000000h) that
occur above the 4G limit (0ffffffffh) may not signal a #GP fault.
Implication:
When such memory accesses occur in 32-bit mode, the system may not issue a #GP
fault.
Workaround:
Software should ensure that memory accesses in 32-bit mode do not occur above the
4G limit (0ffffffffh).
Status:
For the steppings affected, see the Summary Tables of Changes.
AAO14.
LBR, BTS, BTM May Report a Wrong Address when an Exception/
Interrupt Occurs in 64-bit Mode
Problem:
An exception/interrupt event should be transparent to the LBR (Last Branch Record),
BTS (Branch Trace Store) and BTM (Branch Trace Message) mechanisms. However,
during a specific boundary condition where the exception/interrupt occurs right after
the execution of an instruction at the lower canonical boundary (0x00007FFFFFFFFFFF)
in 64-bit mode, the LBR return registers will save a wrong return address with bits 63
to 48 incorrectly sign extended to all 1's. Subsequent BTS and BTM operations which
report the LBR will also be incorrect.
Implication:
LBR, BTS and BTM may report incorrect information in the event of an exception/
interrupt.
Workaround:
None identified.
Status:
For the steppings affected, see the Summary Tables of Changes.
AAO15.
MONITOR or CLFLUSH on the Local XAPIC's Address Space Results in
Hang
Problem:
If the target linear address range for a MONITOR or CLFLUSH is mapped to the local
xAPIC's address space, the processor will hang.
Implication:
When this erratum occurs, the processor will hang. The local xAPIC's address space
must be uncached. The MONITOR instruction only functions correctly if the specified
linear address range is of the type write-back. CLFLUSH flushes data from the cache.
Intel has not observed this erratum with any commercially available software.
Workaround:
Do not execute MONITOR or CLFLUSH instructions on the local xAPIC address space.
Status:
For the steppings affected, see the Summary Tables of Changes.
Summary of Contents for BV80605001914AG - Processor - 1 x Xeon X3430
Page 1: ...Reference Number 322373 009 Intel Xeon Processor 3400 Series Specification Update May 2010 ...
Page 4: ...Contents 4 Specification Update ...
Page 59: ...59 Specification Update October 2009 ...
Page 60: ...60 Specification Update March 2008 ...
Page 61: ...61 Specification Update October 2009 ...
