BPIALLIS, Branch Predictor Invalidate All, Inner Shareable

The BPIALLIS characteristics are:

Purpose

Invalidate all entries from branch predictors Inner Shareable.

Configuration

This instruction is present only when AArch32 is supported. Otherwise, direct accesses to BPIALLIS are UNDEFINED.

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

This instruction has no applicable fields.

The value in the register specified by <Rt> is ignored.

Executing the BPIALLIS instruction

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

Accesses to this instruction use the following encodings in the System instruction encoding space:

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

coprocopc1CRnCRmopc2
0b11110b0000b01110b00010b110

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 BPIALLIS(); elsif PSTATE.EL == EL2 then BPIALLIS(); elsif PSTATE.EL == EL3 then BPIALLIS();


30/09/2021 15:34; 092b4e1bbfbb45a293b198f9330c5f529ead2b0f

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