The DC IGDVAC characteristics are:
Invalidate data and Allocation Tags in data cache by address to Point of Coherency.
This instruction is present only when FEAT_MTE2 is implemented. Otherwise, direct accesses to DC IGDVAC are UNDEFINED.
DC IGDVAC is a 64-bit System instruction.
63 | 62 | 61 | 60 | 59 | 58 | 57 | 56 | 55 | 54 | 53 | 52 | 51 | 50 | 49 | 48 | 47 | 46 | 45 | 44 | 43 | 42 | 41 | 40 | 39 | 38 | 37 | 36 | 35 | 34 | 33 | 32 |
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Virtual address to use | |||||||||||||||||||||||||||||||
Virtual address to use |
Virtual address to use. No alignment restrictions apply to this VA.
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.
This instruction requires write 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 in the System instruction encoding space:
op0 | op1 | CRn | CRm | op2 |
---|---|---|---|---|
0b01 | 0b000 | 0b0111 | 0b0110 | 0b101 |
if PSTATE.EL == EL0 then UNDEFINED; 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.DCIVAC == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else AArch64.DC(X[t], CacheType_Data_Tag, CacheOp_Invalidate, CacheOpScope_PoC); elsif PSTATE.EL == EL2 then AArch64.DC(X[t], CacheType_Data_Tag, CacheOp_Invalidate, CacheOpScope_PoC); elsif PSTATE.EL == EL3 then AArch64.DC(X[t], CacheType_Data_Tag, CacheOp_Invalidate, CacheOpScope_PoC);
20/09/2021 11:02; d4a233ffbdfb36e47856c443a7ce9a85f5e501ca
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