DTLBIALL, Data TLB Invalidate All

The DTLBIALL characteristics are:

Purpose

Invalidate all cached copies of translation table entries from data TLBs that are from any level of the translation table walk. The entries that are invalidated are as follows:

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.

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

Configuration

There are no configuration notes.

Attributes

DTLBIALL is a 32-bit System instruction.

Field descriptions

DTLBIALL ignores the value in the register specified by the instruction encoding. Software does not have to write a value to the register before issuing this instruction.

Executing the DTLBIALL instruction

This instruction is executed using MCR with the following syntax:

MCR <syntax>

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

<syntax> opc1opc2CRncoprocCRm
p15, 0, <Rt>, c8, c6, 0000000100011110110

Accessibility

The instruction is executable as follows:

Control Accessibility
E2HTGENSEL0EL1EL2EL3
xx0 - WO n/a WO
x01 - WOWOWO
x11 - n/a WOWO

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

When HCR.FB is 1, at Non-secure EL1 this instruction executes as a TLBIALLIS operating on data TLBs only.

Traps and enables

For a description of the prioritization of any generated exceptions, see section G1.11.2 (Exception priority order) in the ARM® Architecture Reference Manual, ARMv8, for ARMv8-A architecture profile for exceptions taken to AArch32 state, and section D1.13.2 (Synchronous exception prioritization) for exceptions taken to AArch64 state. 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 :

When EL2 is implemented and is using AArch32 and SCR_EL3.NS==1 :




18/04/2017 17:00

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