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Commit 4f93d21d authored by David S. Miller's avatar David S. Miller
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sparc64: Support 2GB and 16GB page sizes for kernel linear mappings.



SPARC-T4 supports 2GB pages.

So convert kpte_linear_bitmap into an array of 2-bit values which
index into kern_linear_pte_xor.

Now kern_linear_pte_xor is used for 4 page size aligned regions,
4MB, 256MB, 2GB, and 16GB respectively.

Enabling 2GB pages is currently hardcoded using a check against
sun4v_chip_type.  In the future this will be done more cleanly
by interrogating the machine description which is the correct
way to determine this kind of thing.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 699871bc
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