K 10
svn:author
V 6
royger
K 8
svn:date
V 27
2015-02-16T16:37:59.817793Z
K 7
svn:log
V 431
xen/intr: improve handling of legacy IRQs

Devices that use ISA IRQs expect them to be already configured, and don't
call bus_config_intr, which prevents those IRQs from working on Xen. In
order to solve it pre-register all the legacy IRQs with the default values
(edge triggered, low polarity) if no override is found.

While there add a panic if the registration of an interrupt override fails.

Sponsored by: Citrix Systems R&D

END