get_bit_offset
bit = BIT(get_bit_offset(index, PMCR0_CNT_ENABLE_0_7));
bit = BIT(get_bit_offset(index - 8, PMCR0_CNT_ENABLE_8_9));
bit = BIT(get_bit_offset(index, PMCR0_PMI_ENABLE_0_7));
bit = BIT(get_bit_offset(index - 8, PMCR0_PMI_ENABLE_8_9));
user_bit = BIT(get_bit_offset(index, PMCR1_COUNT_A64_EL0_0_7));
kernel_bit = BIT(get_bit_offset(index, PMCR1_COUNT_A64_EL1_0_7));
user_bit = BIT(get_bit_offset(index - 8, PMCR1_COUNT_A64_EL0_8_9));
kernel_bit = BIT(get_bit_offset(index - 8, PMCR1_COUNT_A64_EL1_8_9));