powerpc/64s/exception: Add ISIDE option

Rather than using DAR=2 to select the i-side registers, add an
explicit option.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200225173541.1549955-10-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2020-02-26 03:35:18 +10:00 • committed by Michael Ellerman
commit a3cd35be6e