K 10
svn:author
V 6
mhorne
K 8
svn:date
V 27
2019-11-15T03:18:11.486781Z
K 7
svn:log
V 684
plic: support irq distribution

Our PLIC implementation only enables interrupts on the boot cpu.
Implement plic_bind_intr() so that they can be redistributed near the
end of boot during intr_irq_shuffle().

This also slightly modifies how enable bits are handled in an attempt to
better fit the PIC interface. plic_enable_intr()/plic_disable_intr() are
converted to manage an interrupt source's threshold value, since this
value can be used as to globally enable/disable an irq. All handing of the
per-context enable bits is moved to the new methods plic_setup_intr()
and plic_bind_intr().

Reviewed by:	br
MFC after:	3 weeks
Differential Revision:	https://reviews.freebsd.org/D21928

END