ITLBIASID Instruction TLB Invalidate by ASID match when FEAT_AA32EL1 is implemented Invalidate all cached copies of translation table entries from instruction TLBs that meet the following requirements: The entry is a stage 1 translation table entry. The entry would be used for the specified ASID, and either: Is from a level of lookup above the final level. Is a non-global entry from the final level of lookup. If EL2 is implemented and enabled in the current Security state, the entry would be used with the current VMID. From the entries that match these requirements, the entries that are invalidated are required for the following translation regime: If executed at Secure EL1 when EL3 is using AArch64, the Secure EL1&0 translation regime. If executed in Secure state when EL3 is using AArch32, the Secure PL1&0 translation regime. If executed in Non-secure state, the Non-secure PL1&0 translation regime. The invalidation only applies to the PE that executes this System instruction. Arm deprecates the use of this System instruction. It is only provided for backward compatibility with earlier versions of the Arm architecture. TLB ITLBIASID is a 32-bit System instruction. 31 8 31:8 Reserved, RES0. ASID 7 0 7:0 ASID value to match. Any TLB entries for non-global pages that match the ASID values will be affected by this System instruction. The following pseudocode describes traps which apply to the System instruction. For information about changes to the scope of the invalidation to the instruction under different conditions, see the relevant instruction in the Pseudocode for AArch32 operation. MCR{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>} if !IsFeatureImplemented(FEAT_AA32EL1) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if EL2Enabled() && IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2) && HSTR_EL2().T8 == '1' then AArch64_AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA32EL2) && ELUsingAArch32(EL2) && HSTR().T8 == '1' then AArch32_TakeHypTrapException(0x03); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2) && HCR_EL2().TTLB == '1' then AArch64_AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA32EL2) && ELUsingAArch32(EL2) && HCR().TTLB == '1' then AArch32_TakeHypTrapException(0x03); else AArch32_ITLBI_ASID(SecurityStateAtEL(EL1), Regime_EL10, VMID(), Broadcast_NSH, TLBI_AllAttr, R(t)); end; elsif PSTATE.EL == EL2 then AArch32_ITLBI_ASID(SecurityStateAtEL(EL1), Regime_EL10, VMID(), Broadcast_NSH, TLBI_AllAttr, R(t)); elsif PSTATE.EL == EL3 then AArch32_ITLBI_ASID(SecurityStateAtEL(EL3), Regime_EL30, VMID_NONE, Broadcast_NSH, TLBI_AllAttr, R(t)); end; 2026-03-26 20:27:25 2026-03_rel