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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
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