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# ICIALLU, Instruction Cache Invalidate All to PoU

The ICIALLU characteristics are:

## Purpose

Invalidate all instruction caches of the PE executing the instruction to the Point of Unification. If branch predictors are architecturally visible, also flush branch predictors.

## Configuration

AArch32 System instruction ICIALLU performs the same function as AArch64 System instruction IC IALLU.

This instruction is present only when EL1 is capable of using AArch32. Otherwise, direct accesses to ICIALLU are UNDEFINED.

## Attributes

ICIALLU 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 ICIALLU

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

When HCR.FB is 1, at Non-secure EL1 this instruction executes as a ICIALLUIS.

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

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

coproc | opc1 | CRn | CRm | opc2
--- | --- | --- | --- | ---
0b1111 | 0b000 | 0b0111 | 0b0101 | 0b000

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); elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TPU == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TOCU == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HCR.TPU == '1' then AArch32.TakeHypTrapException(0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HCR2.TOCU == '1' then AArch32.TakeHypTrapException(0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HCR.FB == '1' then AArch32.IC(CacheOpScope_ALLUIS); else AArch32.IC(CacheOpScope_ALLU); elsif PSTATE.EL == EL2 then AArch32.IC(CacheOpScope_ALLU); elsif PSTATE.EL == EL3 then AArch32.IC(CacheOpScope_ALLU);

AArch32 Registers | AArch64 Registers | AArch32 Instructions | AArch64 Instructions | Index by Encoding | External Registers | External Registers by Offset | Registers by Functional Group | Proprietary Notice

26/03/2024 09:49; 67c0ae5282a7629ba0ea0ba7267b43cd4f7939f6

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