Changeset 9043e7e0 in mainline

Timestamp:

2013-01-20T00:27:35Z (12 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

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

Children:

7a38962

Parents:

9eec7bc

Message:

arm32: Count every 64th cycle.

The coutner is 32bit, at 600Mhz it overflows after 7m instead of 7s.

Location:

kernel/arch/arm32

Files:

• include/cycle.h (modified) (1 diff)
• src/cpu/cpu.c (modified) (1 diff)

kernel/arch/arm32/include/cycle.h

@@ -56 +56 @@
            return ((uint64_t)high << 32) | low;
         } else {
-                return PMCCNTR_read();
+                return (uint64_t)PMCCNTR_read() * 64;
         }
 #endif

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

@@ -170 +170 @@
 
 #ifdef PROCESSOR_ARCH_armv7_a
-        PMCR_write(PMCR_read() | PMCR_E_FLAG);
+        PMCR_write(PMCR_read() | PMCR_E_FLAG | PMCR_D_FLAG);
         PMCNTENSET_write(PMCNTENSET_CYCLE_COUNTER_EN_FLAG);
 #endif