BPIMVA, Branch Predictor Invalidate by VA

The BPIMVA characteristics are:

Purpose

Invalidate virtual address from branch predictors.

Configuration

This instruction is present only when AArch32 is supported at any Exception level. Otherwise, direct accesses to BPIMVA are UNDEFINED.

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

Attributes

BPIMVA is a 32-bit System instruction.

Field descriptions

The BPIMVA input value bit assignments are:

313029282726252423222120191817161514131211109876543210
Virtual address to use

Bits [31:0]

Virtual address to use.

Executing the BPIMVA instruction

Accesses to this instruction use the following encodings:

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

coprocopc1CRnCRmopc2
0b11110b0000b01110b01010b111

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T7 == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T7 == '1' then AArch32.TakeHypTrapException(0x03); else BPIMVA(R[t]); elsif PSTATE.EL == EL2 then BPIMVA(R[t]); elsif PSTATE.EL == EL3 then BPIMVA(R[t]);




30/09/2020 15:07; ccead0cb9f089f9ceec50268e82aec9e71047211

Copyright © 2010-2020 Arm Limited or its affiliates. All rights reserved. This document is Non-Confidential.