Mitchell Horne 9ce0b407c2 Implement vm.pmap.kernel_maps for RISC-V
This is taken from the arm64 version, with the following simplifications:

- Our current pmap implementation uses a 3-level paging scheme
- The "mode" field has been omitted since RISC-V PTEs don't encode
  typical mode attributes

Reviewed by:	markj
Differential Revision:	https://reviews.freebsd.org/D23594
2020-02-12 14:06:02 +00:00
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