ARMV6_PMCR_EVT_COUNT1_SHIFT
#define ARMV6_PMCR_EVT_COUNT1_MASK (0xFF << ARMV6_PMCR_EVT_COUNT1_SHIFT)
evt = (hwc->config_base << ARMV6_PMCR_EVT_COUNT1_SHIFT) |
evt = ARMV6_PERFCTR_NOP << ARMV6_PMCR_EVT_COUNT1_SHIFT;