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The Zicntr extension defines an unprivileged wall-clock time CSR that roughly matches the behaviour of an invariant TSC on x86. The nominal frequency of this timer may be read from the "timebase-frequency" property of the CPU node in the device tree. Add a timer source using RDTIME to provide implementations of udelay() and currticks(), modelled on the existing RDTSC-based timer for x86. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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