src/mte_tag: clearly define tag check conditions per privilege mode #18
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Clearly define under which conditions loads/stores are subject to tag checks in each prvilege mode. In M-mode and `satp.MODE == Bare`, all loads/stores are subject to tag checks. Software can rely on using `pointer_tag == 0` to elide tag checks. In less than M-mode where `satp.MODE != Bare`, software can use page table bits to create various discontigous regions of memory which may or may not be subject to tag checks. Signed-off-by: Deepak Gupta <[email protected]>
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Clearly define under which conditions loads/stores are subject to tag checks in each prvilege mode. In M-mode and
satp.MODE == Bare, all loads/stores are subject to tag checks. Software can rely on usingpointer_tag == 0to elide tag checks. In less than M-mode wheresatp.MODE != Bare, software can use page table bits to create various discontigous regions of memory which may or may not be subject to tag checks.