| implement timer for arm >= v6 |
| |
| Signed-off-by: Khem Raj <raj.khem@gmail.com> |
| --- a/utilities/transactions/lock/range/range_tree/lib/portability/toku_time.h |
| +++ b/utilities/transactions/lock/range/range_tree/lib/portability/toku_time.h |
| @@ -161,6 +161,20 @@ static inline tokutime_t toku_time_now(v |
| 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 |