BPIALLIS, Branch Predictor Invalidate All, Inner Shareable

The BPIALLIS characteristics are:

Purpose

Invalidate all entries from branch predictors Inner Shareable.

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

Configuration

In an implementation where the branch predictors are architecturally invisible, this instruction can execute as a NOP.

Attributes

BPIALLIS is a 32-bit System instruction.

Field descriptions

BPIALLIS 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 BPIALLIS 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>, c7, c1, 6000110011111110001

The PE ignores the value of <Rt>. Software does not have to write a value to this register before issuing this instruction.

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.

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 :




02/05/2017 15:43

Copyright © 2010-2017 ARM Limited or its affiliates. All rights reserved. This document is Non-Confidential.