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cpu cycles: on arm64 use clock_gettime and PMCCNTR_EL0 for freestanding #238

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cpu cycles: on arm64 use clock_gettime and PMCCNTR_EL0 for freestanding #238

wants to merge 1 commit into from

Commits on Jun 12, 2024

  1. cpu cycles: on arm64 use clock_gettime and PMCCNTR_EL0 for freestanding 

    previously, cntvct_el0 was used which is capped to 24 MHz, leading to entropy
test failures on macOS and linux-aarch64. The PMCCNTR_EL0 is not available in
user-space normally (for Linux, there is a kernel module).

So, what we do is similar to the ARM32 code path now.

Fixes mirage#216
    @hannesm
    hannesm committed Jun 12, 2024
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