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Currently, the every vcpu only stores the ISA extensions in a unsigned long
which is not scalable as number of extensions will continue to grow.
Using a bitmap allows the ISA extension to support any number of
extensions. The CONFIG one reg interface implementation is modified to
support the bitmap as well. But it is meant only for base extensions.
Thus, the first element of the bitmap array is sufficient for that
interface.
In the future, all the new multi-letter extensions must use the
ISA_EXT one reg interface that allows enabling/disabling any extension
now.
Signed-off-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
9bfd900bee