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[arm64] enable cycle counter #158

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[arm64] enable cycle counter #158

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8 changes: 8 additions & 0 deletions arch/arm64/include/arch/arch_ops.h
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Original file line number Diff line number Diff line change
Expand Up @@ -233,6 +233,14 @@ static inline uint32_t arch_cycle_count(void)
: "=r" (count)
);
return count;
#elif ARM_ISA_ARMV8
uint32_t count;

ISB;
__asm__ volatile("mrs %0, pmccntr_el0"
: "=r" (count)
);
return count;
#else
//#warning no arch_cycle_count implementation
return 0;
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4 changes: 4 additions & 0 deletions arch/arm64/mp.c
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Original file line number Diff line number Diff line change
Expand Up @@ -81,6 +81,10 @@ enum handler_return arm_ipi_reschedule_handler(void *arg)

void arch_mp_init_percpu(void)
{
int pmcr_mask = 1;

__asm__ volatile("msr pmcr_el0, %0":: "r"(pmcr_mask):);

register_int_handler(MP_IPI_GENERIC + GIC_IPI_BASE, &arm_ipi_generic_handler, 0);
register_int_handler(MP_IPI_RESCHEDULE + GIC_IPI_BASE, &arm_ipi_reschedule_handler, 0);

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