ADLINK Express-CVC - Manual (Page 50)

Page 50 Express-CVC
Execute Disable Bit
XD can prevent certain classes of malicious buffer overflow attacks when combined with a supporting OS (Windows Server 2003 SP1,
Windows XP SP2, SuSE Linux 9.2, Red Hat Enterprise 3 Update 3.)
Limit CPUID Maximum
When the computer boots, the operating system executes its 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 the CPUID recognizes. This determines the kind of basic information
CPUID can provide the operating system. This option allows you to circumvent problems with older operating systems.
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.
6.3.5. Thermal Configuration