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/*

 * Performance monitoring

 *

 * Copyright (C) 2010 B Labs Ltd.

 *

 * Author: Bahadir Balban

 */

#include <l4lib/perfmon.h>

#if defined (CONFIG_DEBUG_PERFMON_USER)

/*

 * Resets/restarts cycle counter

 */

void perfmon_reset_start_cyccnt()

{

        volatile u32 pmcctrl;

        /* Disable the cycle counter register */

        cp15_write_perfmon_cntenclr(1 << PMCCNTR_BIT);

        /* Clear the cycle counter on ctrl register */

        pmcctrl = cp15_read_perfmon_ctrl();

        pmcctrl |= (1 << PMCR_C_BIT);

        cp15_write_perfmon_ctrl(pmcctrl);

        /* Clear overflow register */

        cp15_write_perfmon_overflow(1 << PMCCNTR_BIT);

        /* Enable the cycle count */

        cp15_write_perfmon_cntenset(1 << PMCCNTR_BIT);

}

/*

 * Reads current counter, clears and restarts it

 */

u32 perfmon_read_reset_start_cyccnt()

{

        volatile u32 cyccnt = cp15_read_perfmon_cyccnt();

        perfmon_reset_start_cyccnt();

        return cyccnt;

}

#endif /* End of !CONFIG_DEBUG_PERFMON_USER */