This patch masks PIC and IOAPIC RTE''s before x2APIC enabling, unmask
and restore them after x2APIC enabling. It also really enables interrupt
remapping before x2APIC enabling instead of just checking interrupt remapping
setting.
This patch also handles all x2APIC configuration including BIOS settings and
command line settings. Especially, it handles that BIOS hands over in x2APIC
mode (when there is apic id > 255). It checks if x2APIC is already enabled by
BIOS. If already enabled, it will disable interrupt remapping and queued
invalidation first, then enable them again.
Signed-off-by: Weidong Han <weidong.han@intel.com>
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