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From 89c032a9b4011385c0b504ea61e5df0db71f0ff5 Mon Sep 17 00:00:00 2001
From: Khem Raj <raj.khem@gmail.com>
Date: Wed, 16 Jun 2021 19:06:02 -0700
Subject: [PATCH] range_tree: Implement toku_time_now for rv32/rv64 in asm
Upstream-Status: Pending
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
.../range_tree/lib/portability/toku_time.h | 19 +++++++++++++++++++
1 file changed, 19 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 4425a4a2e..4ac964f85 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
@@ -133,6 +133,25 @@ static inline tokutime_t toku_time_now(void) {
return result;
#elif defined(__powerpc__)
return __ppc_get_timebase();
+#elif defined(__riscv) // RISC-V
+#if __riscv_xlen == 32
+ uint32_t lo, hi0, hi1;
+ __asm __volatile__(
+ "rdcycleh %0\n"
+ "rdcycle %1\n"
+ "rdcycleh %2\n"
+ "sub %0, %0, %2\n"
+ "seqz %0, %0\n"
+ "sub %0, zero, %0\n"
+ "and %1, %1, %0\n"
+ : "=r"(hi0), "=r"(lo), "=r"(hi1));
+ return ((uint64_t)hi1 << 32) | lo;
+#else
+ uint64_t result;
+ __asm __volatile__("rdcycle %0" : "=r"(result));
+ return result;
+#endif
+
#else
#error No timer implementation for this platform
#endif
--
2.32.0
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