DCCMVAC, Data Cache line Clean by VA to PoC

The DCCMVAC characteristics are:

Purpose

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

Configuration

AArch32 System instruction DCCMVAC performs the same function as AArch64 System instruction DC CVAC.

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

Attributes

DCCMVAC is a 32-bit System instruction.

Field descriptions

313029282726252423222120191817161514131211109876543210
Virtual address to use

Bits [31:0]

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

Executing the DCCMVAC instruction

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 instruction (DC*)' in the Arm® Architecture Reference Manual, Armv8, for Armv8-A architecture profile.

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

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

coprocopc1CRnCRmopc2
0b11110b0000b01110b10100b001

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); else DCCMVAC(R[t]); elsif PSTATE.EL == EL2 then DCCMVAC(R[t]); elsif PSTATE.EL == EL3 then DCCMVAC(R[t]);


30/06/2021 09:39; 4f5dd962f4e34e1ac282f76da4d6e7fc4cab087e

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