如果pstate.el == el0,则如果EL2ENABLED()&& hcr_el2.tge == 1,则Aarch64.SystemagccessTrap(EL2,0x18);否则AARCH64.SYSTEMACCESSTRAP(EL1,0x18); elsif pstate.el == el1,然后如果EL2ENABLED()&& hcr_el2.tid3 == 1,则AARCH64.SYSTEMACCESSTRAP(EL2,0x18);否则返回ID_AA64ISAR0_EL1; elsif pstate.el == el2,然后返回id_aa64isar0_el1; elsif pstate.el == el3,然后返回id_aa64isar0_el1;