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TLBI VALE2, TLB Invalidate by VA, Last level, EL2

The TLBI VALE2 characteristics are:

Purpose

When EL2 is implemented and enabled in the current Security state, invalidates cached copies of translation table entries from TLBs that meet all the following requirements:

  • The entry is a stage 1 translation table entry.

  • The entry would be used to translate the specified VA using the EL2 or EL2&0 translation regime.

  • If HCR_EL2.E2H == 0, the entry is from the final level of the translation table walk.

  • If HCR_EL2.E2H == 1, one of the following applies:

    • The entry is a global entry from the final level of the translation table walk.

    • The entry is a non-global entry from the final level of translation table walk that matches the specified ASID.

The invalidation applies to the PE that executes this System instruction.

Configuration

Attributes

TLBI VALE2 is a 64-bit System instruction.

Field descriptions

The TLBI VALE2 input value bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
ASIDTTLVA[55:12]
VA[55:12]
313029282726252423222120191817161514131211109876543210

ASID, bits [63:48]

When HCR_EL2.E2H == 1:

ASID value to match. Any TLB entries that match the ASID value and VA value will be affected by this System instruction.

Global TLB entries that match the VA value will be affected by this System instruction, regardless of the value of the ASID field.

If the implementation supports 16 bits of ASID, but only 8 bits are being used in the context being invalidated, the upper bits are RES0.


Otherwise:

Reserved, RES0.

TTL, bits [47:44]

When ARMv8.4-TTL is implemented:

Translation Table Level. Indicates the level of the page table walk that holds the leaf entry for the address being invalidated.

TTLMeaning
0b00xx

No information supplied as to the translation table level. Hardware must assume that the entry can be from any level. In this case, TTL<1:0> is RES0.

0b01xx

The entry comes from a 4KB translation granule. The level of walk for the leaf level 0bxx is encoded as:

0b00 : Reserved. Treat as if TTL<3:2> is 0b00.

0b01 : Level 1.

0b10 : Level 2.

0b11 : Level 3.

0b10xx

The entry comes from a 16KB translation granule. The level of walk for the leaf level 0bxx is encoded as:

0b00 : Reserved. Treat as if TTL<3:2> is 0b00.

0b01 : Reserved. Treat as if TTL<3:2> is 0b00.

0b10 : Level 2.

0b11 : Level 3.

0b11xx

The entry comes from a 64KB translation granule. The level of walk for the leaf level 0bxx is encoded as:

0b00 : Reserved. Treat as if TTL<3:2> is 0b00.

0b01 : Level 1.

0b10 : Level 2.

0b11 : Level 3.

If an incorrect value of the TTL field is specified for the entry being invalidated by the instruction, then no entries are required by the architecture to be invalidated from the TLB.


Otherwise:

Reserved, RES0.

VA[55:12], bits [43:0]

Bits[55:12] of the virtual address to match. Any appropriate TLB entries that match the ASID value (if appropriate) and VA will be affected by this System instruction.

If the TLB maintenance instructions are targeting a translation regime that is using AArch32, and so has a VA of only 32 bits, then the software must treat bits[55:32] as RES0.

The treatment of the low-order bits of this field depends on the translation granule size, as follows:

  • Where a 4KB translation granule is being used, all bits are valid and used for the invalidation.

  • Where a 16KB translation granule is being used, bits [1:0] of this field are RES0 and ignored when the instruction is executed, because VA[13:12] have no effect on the operation of the instruction.

  • Where a 64KB translation granule is being used, bits [3:0] of this field are RES0 and ignored when the instruction is executed, because VA[15:12] have no effect on the operation of the instruction.

Executing the TLBI VALE2 instruction

Accesses to this instruction use the following encodings:

TLBI VALE2{, <Xt>}

op0op1CRnCRmop2
0b010b1000b10000b01110b101
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && HCR_EL2.NV == '1' then
        AArch64.SystemAccessTrap(EL2, 0x18);
    else
        UNDEFINED;
elsif PSTATE.EL == EL2 then
    TLBI_VALE2(X[t]);
elsif PSTATE.EL == EL3 then
    if !EL2Enabled() then
        UNDEFINED;
    else
        TLBI_VALE2(X[t]);
              


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