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ITLBIASID, Instruction TLB Invalidate by ASID match

The ITLBIASID characteristics are:

Purpose

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, the entry would be used with the current VMID.

From the entries that match these requirement, 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 instruction.

Arm deprecates the use of this instruction. It is only provided for backwards compatibility with earlier versions of the Arm architecture.

Configuration

Attributes

ITLBIASID is a 32-bit System instruction.

Field descriptions

The ITLBIASID input value bit assignments are:

313029282726252423222120191817161514131211109876543210
000000000000000000000000ASID

Bits [31:8]

Reserved, RES0.

ASID, bits [7:0]

ASID value to match. Any TLB entries for non-global pages that match the ASID values will be affected by this operation.

Executing the ITLBIASID instruction

Accesses to this instruction use the following encodings:

MCR{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}

opc1opc2CRncoprocCRm
0b0000b0100b10000b11110b0101
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T8 == '1' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x03);
    elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T8 == '1' then
        AArch32.TakeHypTrapException(0x03);
    elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TTLB == '1' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x03);
    elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR.TTLB == '1' then
        AArch32.TakeHypTrapException(0x03);
    else
        ITLBIASID(R[t]);
elsif PSTATE.EL == EL2 then
    ITLBIASID(R[t]);
elsif PSTATE.EL == EL3 then
    ITLBIASID(R[t]);
              


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