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Message
From: Dysthymicdolt@a...<Dysthymicdolt@a...>
Date: Sat Sep 18 12:57:42 CEST 2004
Subject: [openrisc] Large page support
Are there any plans to support large (e.g., 32KiB) pages? One
possible implementation framework would be to have each TLB way have
two banks and have the large-page seek invert one of the bits of
virtual address (guaranteeing that each look-up would go to a
different bank) and have the large-page seek replace the two least
signficiant bits of the regular page index with the two bits more
significant than those used in the regular page indexing. In this way
most of the row decode could be shared if desired, and (more
importantly) all of the TLB is available for both sizes of pages.
(BTW, are OR1200's TLBs indices decoded in big-endian order? This
would seem have the potential to save a slight amount of power because
the MSbs tend to change less frequently. Unfortunately, I have not
learned verilog, so I cannot check this for myself.)
Paul A. Clayton
just a technophile
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