HRMR Hyp Reset Management Register when FEAT_AA32 is implemented RMR_EL2 Architectural AArch64 31 0 31 0 31 0 31 0 If EL2 is the highest implemented Exception level and this register is implemented: A write to the register at EL2 can request a Warm reset. If EL2 can use AArch32 and AArch64, this register specifies the Execution state that the PE boots into on a Warm reset. Virt Reset Management Only implemented if EL2 is the highest implemented Exception level. In this case: If EL2 can use AArch32 and AArch64 then this register must be implemented. If EL2 cannot use AArch64 then it is IMPLEMENTATION DEFINED whether the register is implemented. HRMR is a 32-bit register. 31 2 31:2 Reserved, RES0. RR 1 1 1 Reset Request. Setting this bit to 1 requests a Warm reset. '0' AA64 0 0 0 Determines which Execution state the PE boots into after a Warm reset: On coming out of the Warm reset, execution starts at the IMPLEMENTATION DEFINED reset vector address of the specified Execution state. 0b0 AArch32. 0b1 AArch64. '0' When Implementation can reset into AArch64 state 0 0 0 Reserved, RAZ/WI. Otherwise MRC{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>} if !IsFeatureImplemented(FEAT_AA32) then Undefined(); elsif PSTATE.EL == EL1 && EL2Enabled() && IsHighestEL(EL2) && IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2) && HSTR_EL2().T12 == '1' then AArch64_AArch32SystemAccessTrap(EL2, 0x03); elsif PSTATE.EL == EL1 && EL2Enabled() && IsHighestEL(EL2) && IsFeatureImplemented(FEAT_AA32EL2) && ELUsingAArch32(EL2) && HSTR().T12 == '1' then AArch32_TakeHypTrapException(0x03); elsif PSTATE.EL == EL2 && IsHighestEL(EL2) then R(t) = HRMR(); else Undefined(); end; MCR{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>} if !IsFeatureImplemented(FEAT_AA32) then Undefined(); elsif PSTATE.EL == EL1 && EL2Enabled() && IsHighestEL(EL2) && IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2) && HSTR_EL2().T12 == '1' then AArch64_AArch32SystemAccessTrap(EL2, 0x03); elsif PSTATE.EL == EL1 && EL2Enabled() && IsHighestEL(EL2) && IsFeatureImplemented(FEAT_AA32EL2) && ELUsingAArch32(EL2) && HSTR().T12 == '1' then AArch32_TakeHypTrapException(0x03); elsif PSTATE.EL == EL2 && IsHighestEL(EL2) then HRMR() = R(t); else Undefined(); end; 2026-03-26 20:27:25 2026-03_rel