On 09/12/2014 10:00 AM, Hanjun Guo wrote:

From: Tomasz Nowicki <redacted>

ACPI kernel uses MADT table for proper GIC initialization. It needs to
parse GIC related subtables, collect CPU interface and distributor
addresses and call driver initialization function (which is hardware
abstraction agnostic). In a similar way, FDT initialize GICv1/2.

NOTE: This commit allow to initialize GICv1/2 basic functionality.
GICv2 vitalization extension, GICv3/4 and ITS are considered as next
steps.

Aside: A request to specifically update the flags in ACPI to indicate
GICv3/v4 systems has been filed for a future spec revision.

Jon.