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AArch64: Fix HP_TIMING_DIFF computation [BZ# 29329]

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Fix the computation to allow for cntfrq_el0 being larger than 1GHz.
Assume cntfrq_el0 is a multiple of 1MHz to increase the maximum
interval (1024 seconds at 1GHz).

Reviewed-by: Wilco Dijkstra  <Wilco.Dijkstra@arm.com>
This commit is contained in:
Jun Tang 2023-02-22 16:45:59 +00:00 committed by Wilco Dijkstra
parent 8b014a1b1f
commit 311a7e0256
1 changed files with 1 additions and 1 deletions
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sysdeps/aarch64/hp-timing.h
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@ -41,7 +41,7 @@ typedef uint64_t hp_timing_t;
#define HP_TIMING_DIFF(Diff, Start, End) \
({ hp_timing_t freq; \
__asm__ __volatile__ ("mrs %0, cntfrq_el0" : "=r" (freq)); \
(Diff) = ((End) - (Start)) * (UINT64_C(1000000000) / freq); \
(Diff) = (((End) - (Start)) * UINT64_C(1000000000 >> 6)) / (freq >> 6); \
})
#endif /* hp-timing.h */