The CNTVOFF_EL2 characteristics are:
Holds the 64-bit virtual offset. This is the offset between the physical count value visible in CNTPCT_EL0 and the virtual count value visible in CNTVCT_EL0.
AArch64 System register CNTVOFF_EL2 bits [63:0] are architecturally mapped to AArch32 System register CNTVOFF[63:0] .
If EL2 is not implemented, this register is RES0 from EL3 and the virtual counter uses a fixed virtual offset of zero.
This register has no effect if EL2 is not enabled in the current Security state.
When EL2 is implemented and enabled in the current Security state, and is using AArch64, the virtual counter uses a fixed virtual offset of zero in the following situations:
RW fields in this register reset to architecturally UNKNOWN values.
CNTVOFF_EL2 is a 64-bit register.
The CNTVOFF_EL2 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 offset | |||||||||||||||||||||||||||||||
Virtual offset | |||||||||||||||||||||||||||||||
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 offset.
This field resets to an architecturally UNKNOWN value.
Accesses to this register use the following encodings:
op0 | CRn | op1 | op2 | CRm |
---|---|---|---|---|
0b11 | 0b1110 | 0b100 | 0b011 | 0b0000 |
if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && HCR_EL2.<NV2,NV> == '11' then return NVMem[0x060]; elsif EL2Enabled() && HCR_EL2.NV == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else UNDEFINED; elsif PSTATE.EL == EL2 then return CNTVOFF_EL2; elsif PSTATE.EL == EL3 then return CNTVOFF_EL2;
op0 | CRn | op1 | op2 | CRm |
---|---|---|---|---|
0b11 | 0b1110 | 0b100 | 0b011 | 0b0000 |
if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && HCR_EL2.<NV2,NV> == '11' then NVMem[0x060] = X[t]; elsif EL2Enabled() && HCR_EL2.NV == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else UNDEFINED; elsif PSTATE.EL == EL2 then CNTVOFF_EL2 = X[t]; elsif PSTATE.EL == EL3 then CNTVOFF_EL2 = X[t];
13/12/2018 16:42; 6379d01c197f1d40720d32d0f84c419c9187c009
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