| From 9e274ba2762724f353227b5a3a6e4433f706468a Mon Sep 17 00:00:00 2001 |
| From: Khem Raj <raj.khem@gmail.com> |
| Date: Thu, 21 Mar 2024 14:16:08 +0800 |
| Subject: [PATCH] Implement timer for arm >= v6 |
| |
| Upstream-Status: Pending |
| |
| Signed-off-by: Khem Raj <raj.khem@gmail.com> |
| --- |
| .../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 |
| |