Changeset c8a5c8c in mainline

Timestamp:

2013-01-20T11:45:20Z (12 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

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

Children:

4a79e6f

Parents:

7a38962

Message:

arm32: Start performance counters only if we can't use timer extensions.

File:

• kernel/arch/arm32/src/cpu/cpu.c (modified) (1 diff)

kernel/arch/arm32/src/cpu/cpu.c

@@ -175 +175 @@
 
 #ifdef PROCESSOR_ARCH_armv7_a
-        PMCR_write(PMCR_read() | PMCR_E_FLAG | PMCR_D_FLAG);
-        PMCNTENSET_write(PMCNTENSET_CYCLE_COUNTER_EN_FLAG);
+        if ((ID_PFR1_read() & ID_PFR1_GEN_TIMER_EXT_MASK) !=
+            ID_PFR1_GEN_TIMER_EXT) {
+                PMCR_write(PMCR_read() | PMCR_E_FLAG | PMCR_D_FLAG);
+                PMCNTENSET_write(PMCNTENSET_CYCLE_COUNTER_EN_FLAG);
+        }
 #endif
 }