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Add timer for riscv.
Upstream PR status: https://github.com/facebook/rocksdb/pull/9215
This PR hasn't been merged into the main branch.
https://bugs.gentoo.org/834855
--- a/utilities/transactions/lock/range/range_tree/lib/portability/toku_time.h
+++ b/utilities/transactions/lock/range/range_tree/lib/portability/toku_time.h
@@ -101,7 +101,7 @@ int toku_clock_gettime(clockid_t clk_id, struct timespec *ts) __attribute__((__v
typedef uint64_t tokutime_t; // Time type used in by tokutek timers.
#if 0
-// The value of tokutime_t is not specified here.
+// The value of tokutime_t is not specified here.
// It might be microseconds since 1/1/1970 (if gettimeofday() is
// used), or clock cycles since boot (if rdtsc is used). Or something
// else.
@@ -133,6 +133,23 @@ static inline tokutime_t toku_time_now(void) {
return result;
#elif defined(__powerpc__)
return __ppc_get_timebase();
+#elif defined(__riscv) && __riscv_xlen == 32
+ uint32_t cycles_lo, cycles_hi0, cycles_hi1;
+ // Implemented in assembly because Clang insisted on branching.
+ 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"(cycles_hi0), "=r"(cycles_lo), "=r"(cycles_hi1));
+ return (static_cast<uint64_t>(cycles_hi1) << 32) | cycles_lo;
+#elif defined(__riscv) && __riscv_xlen == 64
+ uint64_t cycles;
+ asm volatile("rdcycle %0" : "=r"(cycles));
+ return cycles;
#else
#error No timer implementation for this platform
#endif
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