[rtems commit] powerpc: Fix _CPU_Counter_read()

Sebastian Huber sebh at rtems.org
Wed Jul 15 07:03:14 UTC 2015


Module:    rtems
Branch:    master
Commit:    e2fcb7dc64c040b8298684148390aba6bf4f4912
Changeset: http://git.rtems.org/rtems/commit/?id=e2fcb7dc64c040b8298684148390aba6bf4f4912

Author:    Nick Withers <nick.withers at anu.edu.au>
Date:      Wed Jul 15 08:55:42 2015 +0200

powerpc: Fix _CPU_Counter_read()

The mftb is not available on Book E processors.  Use SPR 268 instead.

Close #2369.

---

 cpukit/score/cpu/powerpc/rtems/score/cpu.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cpukit/score/cpu/powerpc/rtems/score/cpu.h b/cpukit/score/cpu/powerpc/rtems/score/cpu.h
index 06cab2c..45298a4 100644
--- a/cpukit/score/cpu/powerpc/rtems/score/cpu.h
+++ b/cpukit/score/cpu/powerpc/rtems/score/cpu.h
@@ -842,7 +842,7 @@ static inline CPU_Counter_ticks _CPU_Counter_read( void )
   /* Use Alternate Time Base */
   __asm__ volatile( "mfspr %0, 526" : "=r" (value) );
 #else
-  __asm__ volatile( "mftb %0" : "=r" (value) );
+  __asm__ volatile( "mfspr %0, 268" : "=r" (value) );
 #endif
 
   return value;




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