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

The DC CGVADP characteristics are:

Purpose

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

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

Configuration

This instruction is present only when ARMv8.2-DCCVADP is implemented and ARMv8.5-MemTag is implemented. Otherwise, direct accesses to DC CGVADP are UNDEFINED.

Attributes

DC CGVADP is a 64-bit System instruction.

Field descriptions

The DC CGVADP 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 CGVADP 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 CGVADP, <Xt>

op0CRnop1op2CRm
0b010b01110b0110b0110b1101

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




13/12/2018 16:42; 6379d01c197f1d40720d32d0f84c419c9187c009

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