From 9e274ba2762724f353227b5a3a6e4433f706468a Mon Sep 17 00:00:00 2001 From: Khem Raj Date: Thu, 21 Mar 2024 14:16:08 +0800 Subject: [PATCH] Implement timer for arm >= v6 Upstream-Status: Pending Signed-off-by: Khem Raj --- .../range/range_tree/lib/portability/toku_time.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/utilities/transactions/lock/range/range_tree/lib/portability/toku_time.h b/utilities/transactions/lock/range/range_tree/lib/portability/toku_time.h index ad7d9f2124..bcb795b7e7 100644 --- a/utilities/transactions/lock/range/range_tree/lib/portability/toku_time.h +++ b/utilities/transactions/lock/range/range_tree/lib/portability/toku_time.h @@ -168,6 +168,20 @@ static inline tokutime_t toku_time_now(void) { struct timeval tv; gettimeofday(&tv, nullptr); return (uint64_t)tv.tv_sec * 1000000 + tv.tv_usec; +#elif (__ARM_ARCH >= 6) + uint32_t pmccntr; + uint32_t pmuseren; + uint32_t pmcntenset; + // Read the user mode perf monitor counter access permissions. + asm volatile("mrc p15, 0, %0, c9, c14, 0" : "=r"(pmuseren)); + if (pmuseren & 1) { // Allows reading perfmon counters for user mode code. + asm volatile("mrc p15, 0, %0, c9, c12, 1" : "=r"(pmcntenset)); + if (pmcntenset & 0x80000000ul) { // Is it counting? + asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r"(pmccntr)); + // The counter is set up to count every 64th cycle + return (uint64_t)pmccntr * 64; // Should optimize to << 6 + } + } #else #error No timer implementation for this platform #endif -- 2.25.1