The DC IGVAC characteristics are:
Invalidate Allocation Tags in data cache by address to Point of Coherency.
This instruction is present only when ARMv8.5-MemTag is implemented. Otherwise, direct accesses to DC IGVAC are UNDEFINED.
DC IGVAC is a 64-bit System instruction.
The DC IGVAC input value bit assignments are:
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 |
Virtual address to use | |||||||||||||||||||||||||||||||
Virtual address to use | |||||||||||||||||||||||||||||||
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. 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' 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:
op0 | op1 | CRn | CRm | op2 |
---|---|---|---|---|
0b01 | 0b000 | 0b0111 | 0b0110 | 0b011 |
if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TPCP == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.SWIO == '1' then DC_CIGVAC(X[t]); else DC_IGVAC(X[t]); elsif PSTATE.EL == EL2 then DC_IGVAC(X[t]); elsif PSTATE.EL == EL3 then DC_IGVAC(X[t]);
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