implement timer for arm >= v6
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Signed-off-by: Khem Raj <raj.khem@gmail.com>
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--- a/utilities/transactions/lock/range/range_tree/lib/portability/toku_time.h
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+++ b/utilities/transactions/lock/range/range_tree/lib/portability/toku_time.h
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@@ -161,6 +161,20 @@ static inline tokutime_t toku_time_now(v
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struct timeval tv;
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gettimeofday(&tv, nullptr);
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return (uint64_t)tv.tv_sec * 1000000 + tv.tv_usec;
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+#elif (__ARM_ARCH >= 6)
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+ uint32_t pmccntr;
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+ uint32_t pmuseren;
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+ uint32_t pmcntenset;
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+ // Read the user mode perf monitor counter access permissions.
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+ asm volatile("mrc p15, 0, %0, c9, c14, 0" : "=r"(pmuseren));
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+ if (pmuseren & 1) { // Allows reading perfmon counters for user mode code.
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+ asm volatile("mrc p15, 0, %0, c9, c12, 1" : "=r"(pmcntenset));
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+ if (pmcntenset & 0x80000000ul) { // Is it counting?
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+ asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r"(pmccntr));
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+ // The counter is set up to count every 64th cycle
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+ return (uint64_t)pmccntr * 64; // Should optimize to << 6
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+ }
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+ }
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#else
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#error No timer implementation for this platform
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#endif
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