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geist >
ugh, not having zicntr is really lame, it's even mandated by RVA20 and RVA22 (though checking it now, the RVA20U64 and RVA22U64 have slightly different wording re: zicntr)
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courmisch >
geist: why would RDTIME return 0? it's not a security issue like RDCYCLE
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geist >
if the firmware or hardware simply doesn't implement it
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geist >
then 0 is the only reasonable answer (or an illegal instruction)
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courmisch >
unlord: RDTIME can have a rather low frequency, so getting two equal value consecutively is possible
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courmisch >
but they shouldn't be zero (well, except for what geist said)
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geist >
well technically they're covered by the Zinctr feature
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geist >
and if that's not present, then it can be unimplemented
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geist >
i actually checked what linux does, it the riscv vdso does not use it, it always makes a call for gettimeofday
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courmisch >
the spec seems to imply that if you have CSR, you have to have TIME, CYCLES and INSTRET?
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geist >
that's Zicsr
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courmisch >
ah ok, yeah, it's different chapters
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geist >
Zinctr is a separate feature bit that says whether or not the counters return
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geist >
it was initially i think not separate like that but it got more formalized
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geist >
that being said both RVA20 and RVA22 basically mandate it
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