34
64-bit Intel
®
Xeon
®
Processor with 800 MHz System Bus
(1 MB and 2 MB L2 Cache Versions) Specification Update
Errata
S57
A push of ESP that faults may zero the upper 32-bits of RSP
Problem:
In the event that a push
ESP
instruction, that faults, is executed in compatibility mode, the
processor will incorrectly zero upper 32-bits of RSP.
Implication:
A Push of ESP in compatibility mode will zero the upper 32-bits of RSP. Due to this erratum, this
instruction fault may change the contents of RSP. This erratum has not been observed in
commercially available software.
Workaround:
None at this time.
Status:
For the steppings affected, see the
Summary Table of Changes
.
S58
Enhanced halt state (C1E) voltage transition may affect a system’s power
management in a Hyper-Threading Technology enabled processor
Problem:
In an HT Technology enabled system, the second logical Processor may fail to wake up from
“Wait-for-SIPI” state during a C1E voltage transition.
Implication:
This erratum may affect a system’s entry into the power management mode offered by the C1E
event for HT Technology enabled platforms.
Workaround:
It is possible for the BIOS to contain a workaround for this erratum.
Status:
For the steppings affected, see the
Summary Table of Changes
.
S59
Enhanced halt state (C1E) may not be entered in a Hyper-Threading
Technology enabled processor
Problem:
If the IA32_MISC_ENABLE MSR (0x1A0) C1E enable bit is not set prior to an INIT event on an
HT Technology enabled system, the processor will not enter C1E until the next SIPI wakeup event
for the second logical processor.
Implication:
Due to this erratum, the processor will not enter C1E state.
Workaround:
If C1E is supported in the system, the IA32_MISC_ENABLE MSR should be enabled prior to
issuing the first SIPI to the second logical processor.
Status:
For the steppings affected, see the
Summary Table of Changes
.
S60
When the Execute Disable Bit function is enabled a page fault in a
mispredicted branch may result in a page fault exception
Problem:
If a page fault in a mispredicted branch occurs in the ITLB, it should not be reported by the
processor. However, if the execute disable bit function is enabled (IA32_EFER.NXE = 1) and there
is a page fault in a mispredicted branch in the ITLB, a page fault exception may occur.
Implication:
When this erratum occurs, a page fault exception may occur.
Workaround:
It is possible for the BIOS to contain a workaround for this erratum.
Status:
For the steppings affected, see the
Summary Table of Changes
.
S61
Execute Disable Bit set with AD assist may cause livelock
Problem:
If Execute Disable Bit is set and the resulting page requires the processor to set the A and/or D bit
(Access and/or Dirty bit) in the PTE, then the processor may livelock.
Implication:
When this erratum occurs, the processor may livelock resulting in a system hang or operating
system failure.
Workaround:
It is possible for the BIOS to contain a workaround for this erratum.
Status:
For the steppings affected, see the
Summary Table of Changes
.
