ICIALLU, Instruction Cache Invalidate All to PoU

The ICIALLU characteristics are:

Purpose

Invalidate all instruction caches to PoU. If branch predictors are architecturally visible, also flush branch predictors.

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

Configuration

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

Attributes

ICIALLU is a 32-bit System instruction.

Field descriptions

ICIALLU 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 ICIALLU 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, c5, 0000000011111110101

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.

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

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 :




28/09/2017 08:24

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