u64 __read_sysreg_by_encoding()

in kernel/cpufeature.c [1247:1303]

• 51 lines of code
• 37 McCabe index (conditional complexity)

u64 __read_sysreg_by_encoding(u32 sys_id)
{
	struct arm64_ftr_reg *regp;
	u64 val;

	switch (sys_id) {
	read_sysreg_case(SYS_ID_PFR0_EL1);
	read_sysreg_case(SYS_ID_PFR1_EL1);
	read_sysreg_case(SYS_ID_PFR2_EL1);
	read_sysreg_case(SYS_ID_DFR0_EL1);
	read_sysreg_case(SYS_ID_DFR1_EL1);
	read_sysreg_case(SYS_ID_MMFR0_EL1);
	read_sysreg_case(SYS_ID_MMFR1_EL1);
	read_sysreg_case(SYS_ID_MMFR2_EL1);
	read_sysreg_case(SYS_ID_MMFR3_EL1);
	read_sysreg_case(SYS_ID_MMFR4_EL1);
	read_sysreg_case(SYS_ID_MMFR5_EL1);
	read_sysreg_case(SYS_ID_ISAR0_EL1);
	read_sysreg_case(SYS_ID_ISAR1_EL1);
	read_sysreg_case(SYS_ID_ISAR2_EL1);
	read_sysreg_case(SYS_ID_ISAR3_EL1);
	read_sysreg_case(SYS_ID_ISAR4_EL1);
	read_sysreg_case(SYS_ID_ISAR5_EL1);
	read_sysreg_case(SYS_ID_ISAR6_EL1);
	read_sysreg_case(SYS_MVFR0_EL1);
	read_sysreg_case(SYS_MVFR1_EL1);
	read_sysreg_case(SYS_MVFR2_EL1);

	read_sysreg_case(SYS_ID_AA64PFR0_EL1);
	read_sysreg_case(SYS_ID_AA64PFR1_EL1);
	read_sysreg_case(SYS_ID_AA64ZFR0_EL1);
	read_sysreg_case(SYS_ID_AA64DFR0_EL1);
	read_sysreg_case(SYS_ID_AA64DFR1_EL1);
	read_sysreg_case(SYS_ID_AA64MMFR0_EL1);
	read_sysreg_case(SYS_ID_AA64MMFR1_EL1);
	read_sysreg_case(SYS_ID_AA64MMFR2_EL1);
	read_sysreg_case(SYS_ID_AA64ISAR0_EL1);
	read_sysreg_case(SYS_ID_AA64ISAR1_EL1);
	read_sysreg_case(SYS_ID_AA64ISAR2_EL1);

	read_sysreg_case(SYS_CNTFRQ_EL0);
	read_sysreg_case(SYS_CTR_EL0);
	read_sysreg_case(SYS_DCZID_EL0);

	default:
		BUG();
		return 0;
	}

	regp  = get_arm64_ftr_reg(sys_id);
	if (regp) {
		val &= ~regp->override->mask;
		val |= (regp->override->val & regp->override->mask);
	}

	return val;
}