DC IGDVAC, Invalidate of Data and Allocation Tags by VA to PoC

The DC IGDVAC characteristics are:

Purpose

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

Configuration

This instruction is present only when FEAT_MTE2 is implemented. Otherwise, direct accesses to DC IGDVAC are UNDEFINED.

Attributes

DC IGDVAC is a 64-bit System instruction.

Field descriptions

6362616059585756555453525150494847464544434241403938373635343332
313029282726252423222120191817161514131211109876543210
VA
VA

VA, bits [63:0]

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

Executing DC IGDVAC

When the instruction is executed, it can generate a watchpoint, which is prioritized in the same way as other watchpoints. If a watchpoint is generated, the CM bit in the ESR_ELx.ISS field is set to 1.

If EL0 access is enabled, when executed at EL0, the instruction may generate a Permission fault, subject to the constraints described in 'MMU faults generated by cache maintenance operations'.

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 in the System instruction encoding space:

DC IGDVAC, <Xt>

op0op1CRnCRmop2
0b010b0000b01110b01100b101

if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && HCR_EL2.TPCP == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HFGITR_EL2.DCIVAC == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else AArch64.DC(X[t, 64], CacheType_Data_Tag, CacheOp_Invalidate, CacheOpScope_PoC); elsif PSTATE.EL == EL2 then AArch64.DC(X[t, 64], CacheType_Data_Tag, CacheOp_Invalidate, CacheOpScope_PoC); elsif PSTATE.EL == EL3 then AArch64.DC(X[t, 64], CacheType_Data_Tag, CacheOp_Invalidate, CacheOpScope_PoC);


26/03/2024 09:49; 67c0ae5282a7629ba0ea0ba7267b43cd4f7939f6

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