CNTVCT Counter-timer Virtual Count register when FEAT_AA32 is implemented CNTVCT_EL0 Architectural AArch64 63 0 63 0 63 0 63 0 Holds the 64-bit virtual count value. The virtual count value is equal to the physical count value minus the virtual offset visible in CNTVOFF. Timer The value of this register is the same as the value of CNTPCT in the following conditions: When EL2 is not implemented. When the Effective value of HCR_EL2.{E2H, TGE} is {1, 1}, and this register is read from Non-secure EL0. All reads to the CNTVCT occur in program order relative to reads to CNTVCTSS or CNTVCT. CNTVCT is a 64-bit register. VirtualCount Virtual count value 63 0 63:0 Virtual count value. AU MRRC{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <Rt2>, <CRm> if !IsFeatureImplemented(FEAT_AA32) then Undefined(); elsif PSTATE.EL == EL0 then if IsFeatureImplemented(FEAT_AA64EL1) && !ELUsingAArch32(EL1) && !ELIsInHost(EL0) && CNTKCTL_EL1().EL0VCTEN == '0' then if EL2Enabled() && (IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2)) && HCR_EL2().TGE == '1' then AArch64_AArch32SystemAccessTrap(EL2, 0x04); else AArch64_AArch32SystemAccessTrap(EL1, 0x04); end; elsif IsFeatureImplemented(FEAT_AA32EL1) && ELUsingAArch32(EL1) && CNTKCTL().PL0VCTEN == '0' then if EL2Enabled() && (IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2)) && HCR_EL2().TGE == '1' then AArch64_AArch32SystemAccessTrap(EL2, 0x04); elsif EL2Enabled() && (IsFeatureImplemented(FEAT_AA32EL2) && ELUsingAArch32(EL2)) && HCR().TGE == '1' then AArch32_TakeHypTrapException(0x00); else Undefined(); end; elsif ELIsInHost(EL0) && (IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2)) && CNTHCTL_EL2().EL0VCTEN == '0' then AArch64_AArch32SystemAccessTrap(EL2, 0x04); elsif EL2Enabled() && (IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2)) && !ELIsInHost(EL0) && CNTHCTL_EL2().EL1TVCT == '1' then AArch64_AArch32SystemAccessTrap(EL2, 0x04); else if HaveEL(EL2) && IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2) && (!EL2Enabled() || !ELIsInHost(EL0)) then R(t, t2) = PhysicalCountInt() - CNTVOFF_EL2(); elsif HaveEL(EL2) && IsFeatureImplemented(FEAT_AA32EL2) && !ELUsingAArch32(EL2) && (!EL2Enabled() || !ELIsInHost(EL0)) then R(t, t2) = PhysicalCountInt() - CNTVOFF(); elsif HaveEL(EL2) && IsFeatureImplemented(FEAT_AA32EL2) && ELUsingAArch32(EL2) then R(t, t2) = PhysicalCountInt() - CNTVOFF(); else R(t, t2) = PhysicalCountInt(); end; end; elsif PSTATE.EL == EL1 then if EL2Enabled() && IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2) && CNTHCTL_EL2().EL1TVCT == '1' then AArch64_AArch32SystemAccessTrap(EL2, 0x04); else if HaveEL(EL2) && IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2) then R(t, t2) = PhysicalCountInt() - CNTVOFF_EL2(); elsif HaveEL(EL2) && IsFeatureImplemented(FEAT_AA32EL2) && ELUsingAArch32(EL2) then R(t, t2) = PhysicalCountInt() - CNTVOFF(); else R(t, t2) = PhysicalCountInt(); end; end; elsif PSTATE.EL == EL2 then if HaveEL(EL2) then R(t, t2) = PhysicalCountInt() - CNTVOFF(); else R(t, t2) = PhysicalCountInt(); end; elsif PSTATE.EL == EL3 then if HaveEL(EL2) && IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2) then R(t, t2) = PhysicalCountInt() - CNTVOFF_EL2(); elsif HaveEL(EL2) && IsFeatureImplemented(FEAT_AA32EL2) then R(t, t2) = PhysicalCountInt() - CNTVOFF(); else R(t, t2) = PhysicalCountInt(); end; end; 2026-03-26 20:27:25 2026-03_rel