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The Svpbmt extension provides specification of "Page-Based Memory Types", or memory attributes (e.g. cacheability constraints). Extend the pmap code to apply memory attributes when creating/updating PTEs. This is done in a way which has no effect on CPUs lacking Svpbmt support, and is non-hostile to alternate encodings of memory attributes -- a future change will enable this for T-HEAD CPUs, which implement this PTE feature in an different (incompatible) way. Reviewed by: jhb Tested by: br MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D45471 |
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