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lowRISC (an open SoC effort for the RISC-V arch) has a form of tagged memory, that among other things can be used for capabilities.

[0] http://www.lowrisc.org/docs/memo-2014-001-tagged-memory-and-... [1] http://www.lowrisc.org/blog/2015/04/lowrisc-tagged-memory-pr...



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