DCIMVAC, Data Cache line Invalidate by VA to PoC

The DCIMVAC characteristics are:

Purpose

Invalidate data or unified cache line by virtual address to PoC.

Configuration

AArch32 System instruction DCIMVAC performs the same function as AArch64 System instruction DC IVAC.

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

Attributes

DCIMVAC is a 32-bit System instruction.

Field descriptions

The DCIMVAC input value bit assignments are:

313029282726252423222120191817161514131211109876543210
Virtual address to use

Bits [31:0]

Virtual address to use. No alignment restrictions apply to this VA.

Executing the DCIMVAC instruction

It is IMPLEMENTATION DEFINED whether, when this instruction is executed, it can generate a watchpoint. If this instruction can generate a watchpoint this is prioritized in the same way as other watchpoints.

Execution of this instruction might require an address translation from VA to PA, and that translation might fault. For more information, see 'AArch32 data cache maintenance instructions (DC*)'.

Accesses to this instruction use the following encodings:

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

coprocopc1CRnCRmopc2
0b11110b0000b01110b01100b001

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.TPCP == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HCR.TPC == '1' then AArch32.TakeHypTrapException(0x03); elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.<DC,VM> != '00' then DCCIMVAC(R[t]); elsif EL2Enabled() && ELUsingAArch32(EL2) && HCR.<DC,VM> != '00' then DCCIMVAC(R[t]); else DCIMVAC(R[t]); elsif PSTATE.EL == EL2 then DCIMVAC(R[t]); elsif PSTATE.EL == EL3 then DCIMVAC(R[t]);




01/07/2020 15:57; 80324f0b9997bede489cc15ad1565345720bcd2a

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