DC CGVAC, Clean of Allocation Tags by VA to PoC

The DC CGVAC characteristics are:

Purpose

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

Configuration

This instruction is present only when FEAT_MTE is implemented. Otherwise, direct accesses to DC CGVAC are UNDEFINED.

Attributes

DC CGVAC is a 64-bit System instruction.

Field descriptions

The DC CGVAC input value bit assignments are:

6362616059585756555453525150494847464544434241403938373635343332
313029282726252423222120191817161514131211109876543210
Virtual address to use
Virtual address to use

Bits [63:0]

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

Executing the DC CGVAC 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, subject to the constraints described in 'Permission fault'.

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)'.

Accesses to this instruction use the following encodings:

DC CGVAC, <Xt>

op0op1CRnCRmop2
0b010b0110b01110b10100b011

if PSTATE.EL == EL0 then if !(EL2Enabled() && HCR_EL2.<E2H,TGE> == '11') && SCTLR_EL1.UCI == '0' then if EL2Enabled() && HCR_EL2.TGE == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else AArch64.SystemAccessTrap(EL1, 0x18); elsif EL2Enabled() && HCR_EL2.<E2H,TGE> != '11' && HCR_EL2.TPCP == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && HCR_EL2.<E2H,TGE> != '11' && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HFGITR_EL2.DCCVAC == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && HCR_EL2.<E2H,TGE> == '11' && SCTLR_EL2.UCI == '0' then AArch64.SystemAccessTrap(EL2, 0x18); else DC_CGVAC(X[t]); elsif PSTATE.EL == EL1 then if EL2Enabled() && HCR_EL2.TPCP == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HFGITR_EL2.DCCVAC == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else DC_CGVAC(X[t]); elsif PSTATE.EL == EL2 then DC_CGVAC(X[t]); elsif PSTATE.EL == EL3 then DC_CGVAC(X[t]);


30/03/2021 20:52; e3551d56dc294a4d55296a6c10544191ada08a8e

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