powerpc/powernv/vas: Define vas_init() and vas_exit()
Implement vas_init() and vas_exit() functions for a new VAS module. This VAS module is essentially a library for other device drivers and kernel users of the NX coprocessors like NX-842 and NX-GZIP. In the future this will be extended to add support for user space to access the NX coprocessors. VAS is currently only supported with 64K page size. Signed-off-by: NSukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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