Changeset 0a78e4f in mainline for kernel/arch/riscv64/include/arch/cycle.h

Timestamp:

2017-08-22T16:08:00Z (7 years ago)

Author:

Martin Decky <martin@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

b93ea46a

Parents:

d639eaa

Message:

riscv64: cycle performance counter

File:

• kernel/arch/riscv64/include/arch/cycle.h (modified) (1 diff)

kernel/arch/riscv64/include/arch/cycle.h

@@ -40 +40 @@
 NO_TRACE static inline uint64_t get_cycle(void)
 {
-        return 0;
+        uint64_t cycle;
+        
+        asm volatile (
+                "rdcycle %[cycle]\n"
+                : [cycle] "=r" (cycle)
+        );
+        
+        return cycle;
 }