DC CIVAC, Data or unified Cache line Clean and Invalidate by VA to PoC

The DC CIVAC characteristics are:

Purpose

Clean and Invalidate data cache by address to Point of Coherency.

When ARMv8.5-MemTag is implemented, this instruction might clean and invalidate Allocation Tags from caches.

Configuration

AArch64 System instruction DC CIVAC performs the same function as AArch32 System instruction DCCIMVAC.

Attributes

DC CIVAC is a 64-bit System instruction.

Field descriptions

The DC CIVAC input value bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
Virtual address to use
Virtual address to use
313029282726252423222120191817161514131211109876543210

Bits [63:0]

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

Executing the DC CIVAC instruction

Execution of this instruction might require an address translation from VA to PA, and that translation might fault. For more information, see 'The data cache maintenance instruction (DC)' in the Arm® Architecture Reference Manual, Armv8, for Armv8-A architecture profile.

If EL0 access is enabled, when executed at EL0, this instruction requires read access permission to the VA, otherwise it generates a Permission Fault, subject to the constraints described in 'Permission fault' in the Arm® Architecture Reference Manual, Armv8, for Armv8-A architecture profile.

Accesses to this instruction use the following encodings:

DC CIVAC, <Xt>

op0op1CRnCRmop2
0b010b0110b01110b11100b001

if PSTATE.EL == EL0 then if !ELUsingAArch32(EL1) && !(EL2Enabled() && HCR_EL2.<E2H,TGE> == '11') && SCTLR_EL1.UCI == '0' then if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else AArch64.SystemAccessTrap(EL1, 0x18); elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.<E2H,TGE> != '11' && HCR_EL2.TPCP == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.<E2H,TGE> == '11' && SCTLR_EL2.UCI == '0' then AArch64.SystemAccessTrap(EL2, 0x18); else DC_CIVAC(X[t]); elsif PSTATE.EL == EL1 then if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TPCP == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else DC_CIVAC(X[t]); elsif PSTATE.EL == EL2 then DC_CIVAC(X[t]); elsif PSTATE.EL == EL3 then DC_CIVAC(X[t]);




27/03/2019 21:59; e5e4db499bf9867a4b93324c4dbac985d3da9376

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