http://bugzilla.kernel.org/show_bug.cgi?id=14334





--- Comment #99 from Yuhong Bao <[email protected]>  2009-11-11 
04:54:37 ---
"It is true that usually when the IO-APIC is disabled by the BIOS the lapic is
also disabled too"
For why, it is because Windows's non-IO-APIC (8259) HALs did not even try to
use the local APIC. From http://www.microsoft.com/whdc/archive/io-apic.mspx (a
page written when MS was beginning to encourage mobo makers to enable the
IO-APIC on uniprocessors):
"However, without an I/O APIC in the system, the local APICs are useless [to
Windows]. In such a situation, Windows 2000 has to revert to using the 8259
PIC."

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