1*4882a593Smuzhiyunimplement timer for arm >= v6 2*4882a593Smuzhiyun 3*4882a593SmuzhiyunSigned-off-by: Khem Raj <raj.khem@gmail.com> 4*4882a593Smuzhiyun--- a/utilities/transactions/lock/range/range_tree/lib/portability/toku_time.h 5*4882a593Smuzhiyun+++ b/utilities/transactions/lock/range/range_tree/lib/portability/toku_time.h 6*4882a593Smuzhiyun@@ -161,6 +161,20 @@ static inline tokutime_t toku_time_now(v 7*4882a593Smuzhiyun struct timeval tv; 8*4882a593Smuzhiyun gettimeofday(&tv, nullptr); 9*4882a593Smuzhiyun return (uint64_t)tv.tv_sec * 1000000 + tv.tv_usec; 10*4882a593Smuzhiyun+#elif (__ARM_ARCH >= 6) 11*4882a593Smuzhiyun+ uint32_t pmccntr; 12*4882a593Smuzhiyun+ uint32_t pmuseren; 13*4882a593Smuzhiyun+ uint32_t pmcntenset; 14*4882a593Smuzhiyun+ // Read the user mode perf monitor counter access permissions. 15*4882a593Smuzhiyun+ asm volatile("mrc p15, 0, %0, c9, c14, 0" : "=r"(pmuseren)); 16*4882a593Smuzhiyun+ if (pmuseren & 1) { // Allows reading perfmon counters for user mode code. 17*4882a593Smuzhiyun+ asm volatile("mrc p15, 0, %0, c9, c12, 1" : "=r"(pmcntenset)); 18*4882a593Smuzhiyun+ if (pmcntenset & 0x80000000ul) { // Is it counting? 19*4882a593Smuzhiyun+ asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r"(pmccntr)); 20*4882a593Smuzhiyun+ // The counter is set up to count every 64th cycle 21*4882a593Smuzhiyun+ return (uint64_t)pmccntr * 64; // Should optimize to << 6 22*4882a593Smuzhiyun+ } 23*4882a593Smuzhiyun+ } 24*4882a593Smuzhiyun #else 25*4882a593Smuzhiyun #error No timer implementation for this platform 26*4882a593Smuzhiyun #endif 27