Add code for getting timestamp from mrs (async-profiler#1142)

roy-soumadipta · Feb 18, 2025 · f71c31a · f71c31a
1 parent 2d764cc
commit f71c31a
Showing 1 changed file with 15 additions and 0 deletions.
diff --git a/src/tsc.h b/src/tsc.h
@@ -48,6 +48,21 @@ static bool cpuHasGoodTimestampCounter() {
     return (edx & (1 << 8)) != 0;
 }
 
+#elif defined(__aarch64__)
+
+#define TSC_SUPPORTED true
+
+static inline u64 rdtsc() {
+    u64 value;
+    asm volatile("mrs %0, cntvct_el0" : "=r"(value));
+    return value;
+}
+
+static bool cpuHasGoodTimestampCounter() {
+    // AARCH64 always has a good timestamp counter.
+    return true;
+}
+
 #else
 
 #define TSC_SUPPORTED false