ADLINK cPCI-6520 - Manual (Page 89)

BIOS Setup 77
cPCI-6520
Limit CPUID Maximum
When the computer is booted up, the operating system executes
the CPUID instruction to identify the processor and its capabilities.
Before it can do so, it must first query the processor to find out the
highest input value CPUID recognized. This determines the kind of
basic information CPUID can provide the operating system. This
option allows you to circumvent problems with older operating sys-
tems.
When Enabled, the processor will limit the maximum CPUID input
value to 03h when queried, even if the processor supports a
higher CPUID input value. When Disabled, the processor will
return the actual maximum CPUID input value of the processor
when queried.
Execute-Disable Bit
Intel’s Execute Disable Bit functionality can help prevent certain
classes of malicious buffer overflow attacks when combined with a
supporting operating system. Execute Disable Bit allows the pro-
cessor to classify areas in memory by where application code can
execute and where it cannot. When a malicious worm attempt to
insert code in the buffer, the processor disables code execution,
preventing damage and worm propagation.
Intel Virtualization Tech
When enabled, a VMM can utilize the additional hardware capabil-
ity provided by Vanderpool Technology. Set this value to Enabled/
Disabled.