DC CGDVAP, Data, Allocation Tag or unified Cache line Clean of Data and Allocation Tags by VA to PoP

The DC CGDVAP characteristics are:

Purpose

Clean data and Allocation Tags in data cache by address to Point of Persistence.

If the memory system does not identify a Point of Persistence, then this instruction behaves as a DC CGDVAC.

Configuration

This instruction is present only when ARMv8.5-MemTag is implemented. Otherwise, direct accesses to DC CGDVAP are UNDEFINED.

Attributes

DC CGDVAP is a 64-bit System instruction.

Field descriptions

The DC CGDVAP 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 CGDVAP instruction

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

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.

Accesses to this instruction use the following encodings:

DC CGDVAP, <Xt>

op0op1CRnCRmop2
0b010b0110b01110b11000b101

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_CGDVAP(X[t]); elsif PSTATE.EL == EL1 then if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TPCP == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else DC_CGDVAP(X[t]); elsif PSTATE.EL == EL2 then DC_CGDVAP(X[t]); elsif PSTATE.EL == EL3 then DC_CGDVAP(X[t]);




27/03/2019 21:59; e5e4db499bf9867a4b93324c4dbac985d3da9376

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