Changeset 1d6c497 in mainline for kernel/arch/amd64/include/cycle.h

Timestamp:

2010-06-12T09:37:54Z (14 years ago)

Author:

Martin Decky <martin@…>

Branches:

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

Children:

510bc07

Parents:

fd3a631f

Message:

amd64: fix wrong usage of rdtsc

File:

• kernel/arch/amd64/include/cycle.h (modified) (1 diff)

kernel/arch/amd64/include/cycle.h

@@ -36 +36 @@
 #define KERN_amd64_CYCLE_H_
 
-extern uint64_t get_cycle(void);
+static inline uint64_t get_cycle(void)
+{
+        uint32_t lower;
+        uint32_t upper;
+        
+        asm volatile (
+                "rdtsc\n"
+                : "=a" (lower),
+                  "=d" (upper)
+        );
+        
+        return ((uint64_t) lower) | (((uint64_t) upper) << 32);
+}
 
 #endif