TLBI VALE1, TLB Invalidate by VA, Last level, EL1

The TLBI VALE1 characteristics are:

Purpose

Invalidate cached copies of translation table entries from TLBs that meet all the following requirements:

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

This System instruction is part of the TLB maintenance instructions functional group.

Configuration

There are no configuration notes.

Attributes

TLBI VALE1 is a 64-bit System instruction.

Field descriptions

The TLBI VALE1 input value bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
ASID0000VA[55:12]
VA[55:12]
313029282726252423222120191817161514131211109876543210

ASID, bits [63:48]

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

Global TLB entries that match the VA value will be affected by this operation, 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 and must be written to 0 by software performing the TLB maintenance.

Bits [47:44]

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 operation.

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:

Executing the TLBI VALE1 instruction

This instruction is executed using TLBI with the following syntax:

TLBI <tlbi_op>, <Xt>

This syntax uses the following encoding in the System instruction encoding space:

<tlbi_op> op0op1CRnCRmop2
VALE10100010000111101

Accessibility

The instruction is executable as follows:

Control Accessibility
E2HTGENSEL0EL1EL2EL3
xx0 - WO n/a WO
001 - WOWOWO
011 - n/a WOWO
101 - WOWOWO
111 - n/a WOWO

This table applies to all syntax that can be used to execute this instruction.

When HCR_EL2.FB is 1, at Non-secure EL1 this instruction executes as a TLBI VALE1IS.

Traps and enables

For a description of the prioritization of any generated exceptions, see section D1.13.2 (Synchronous exception prioritization) in the ARM® Architecture Reference Manual, ARMv8, for ARMv8-A architecture profile. Subject to the prioritization rules, the following traps and enables are applicable when executing this System instruction.

When EL2 is implemented and is using AArch64 and SCR_EL3.NS==1 && HCR_EL2.E2H==0 :

When EL2 is implemented and is using AArch64 and SCR_EL3.NS==1 && HCR_EL2.E2H==1 && HCR_EL2.TGE==0 :




18/04/2017 17:00

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