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The CNTHV_CVAL_EL2 characteristics are:
Holds the compare value for the EL2 virtual timer.
AArch64 System register CNTHV_CVAL_EL2 bits [63:0] are architecturally mapped to AArch32 System register CNTHV_CVAL[63:0] .
This register is present only when FEAT_VHE is implemented. Otherwise, direct accesses to CNTHV_CVAL_EL2 are UNDEFINED.
If EL2 is not implemented, this register is RES0 from EL3.
CNTHV_CVAL_EL2 is a 64-bit register.
The CNTHV_CVAL_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 |
CompareValue | |||||||||||||||||||||||||||||||
CompareValue | |||||||||||||||||||||||||||||||
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 |
Holds the EL2 virtual timer CompareValue.
When CNTHV_CTL_EL2.ENABLE is 1, the timer condition is met when (CNTVCT_EL0 - CompareValue) is greater than or equal to zero. This means that CompareValue acts like a 64-bit upcounter timer. When the timer condition is met:
When CNTHV_CTL_EL2.ENABLE is 0, the timer condition is not met, but CNTVCT_EL0 continues to count.
If the Generic counter is implemented at a size less than 64 bits, then this field is permitted to be implemented at the same width as the counter, and the upper bits are RES0.
The value of this field is treated as zero-extended in all counter calculations.
When HCR_EL2.E2H is 1, without explicit synchronization, access from EL2 using the mnemonic CNTHV_CVAL_EL2 or CNTV_CVAL_EL0 are not guaranteed to be ordered with respect to accesses using the other mnemonic.
Accesses to this register use the following encodings:
if PSTATE.EL == EL0 then
UNDEFINED;
elsif PSTATE.EL == EL1 then
if EL2Enabled() && HCR_EL2.NV == '1' then
AArch64.SystemAccessTrap(EL2, 0x18);
else
UNDEFINED;
elsif PSTATE.EL == EL2 then
return CNTHV_CVAL_EL2;
elsif PSTATE.EL == EL3 then
return CNTHV_CVAL_EL2;
if PSTATE.EL == EL0 then
UNDEFINED;
elsif PSTATE.EL == EL1 then
if EL2Enabled() && HCR_EL2.NV == '1' then
AArch64.SystemAccessTrap(EL2, 0x18);
else
UNDEFINED;
elsif PSTATE.EL == EL2 then
CNTHV_CVAL_EL2 = X[t];
elsif PSTATE.EL == EL3 then
CNTHV_CVAL_EL2 = X[t];
if PSTATE.EL == EL0 then
if !(EL2Enabled() && HCR_EL2.<E2H,TGE> == '11') && CNTKCTL_EL1.EL0VTEN == '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' && CNTHCTL_EL2.EL0VTEN == '0' then
AArch64.SystemAccessTrap(EL2, 0x18);
elsif EL2Enabled() && HCR_EL2.<E2H,TGE> != '11' && CNTHCTL_EL2.EL1TVT == '1' then
AArch64.SystemAccessTrap(EL2, 0x18);
elsif EL2Enabled() && HCR_EL2.<E2H,TGE> == '11' && SCR_EL3.NS == '0' && IsFeatureImplemented("FEAT_SEL2") then
return CNTHVS_CVAL_EL2;
elsif EL2Enabled() && HCR_EL2.<E2H,TGE> == '11' && SCR_EL3.NS == '1' then
return CNTHV_CVAL_EL2;
else
return CNTV_CVAL_EL0;
elsif PSTATE.EL == EL1 then
if EL2Enabled() && CNTHCTL_EL2.EL1TVT == '1' then
AArch64.SystemAccessTrap(EL2, 0x18);
elsif EL2Enabled() && HCR_EL2.<NV2,NV1,NV> == '111' then
return NVMem[0x168];
else
return CNTV_CVAL_EL0;
elsif PSTATE.EL == EL2 then
if HCR_EL2.E2H == '1' && SCR_EL3.NS == '0' && IsFeatureImplemented("FEAT_SEL2") then
return CNTHVS_CVAL_EL2;
elsif HCR_EL2.E2H == '1' && SCR_EL3.NS == '1' then
return CNTHV_CVAL_EL2;
else
return CNTV_CVAL_EL0;
elsif PSTATE.EL == EL3 then
return CNTV_CVAL_EL0;
if PSTATE.EL == EL0 then
if !(EL2Enabled() && HCR_EL2.<E2H,TGE> == '11') && CNTKCTL_EL1.EL0VTEN == '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' && CNTHCTL_EL2.EL0VTEN == '0' then
AArch64.SystemAccessTrap(EL2, 0x18);
elsif EL2Enabled() && HCR_EL2.<E2H,TGE> != '11' && CNTHCTL_EL2.EL1TVT == '1' then
AArch64.SystemAccessTrap(EL2, 0x18);
elsif EL2Enabled() && HCR_EL2.<E2H,TGE> == '11' && SCR_EL3.NS == '0' && IsFeatureImplemented("FEAT_SEL2") then
CNTHVS_CVAL_EL2 = X[t];
elsif EL2Enabled() && HCR_EL2.<E2H,TGE> == '11' && SCR_EL3.NS == '1' then
CNTHV_CVAL_EL2 = X[t];
else
CNTV_CVAL_EL0 = X[t];
elsif PSTATE.EL == EL1 then
if EL2Enabled() && CNTHCTL_EL2.EL1TVT == '1' then
AArch64.SystemAccessTrap(EL2, 0x18);
elsif EL2Enabled() && HCR_EL2.<NV2,NV1,NV> == '111' then
NVMem[0x168] = X[t];
else
CNTV_CVAL_EL0 = X[t];
elsif PSTATE.EL == EL2 then
if HCR_EL2.E2H == '1' && SCR_EL3.NS == '0' && IsFeatureImplemented("FEAT_SEL2") then
CNTHVS_CVAL_EL2 = X[t];
elsif HCR_EL2.E2H == '1' && SCR_EL3.NS == '1' then
CNTHV_CVAL_EL2 = X[t];
else
CNTV_CVAL_EL0 = X[t];
elsif PSTATE.EL == EL3 then
CNTV_CVAL_EL0 = X[t];
On a Warm reset, thisThis field resets to an architecturally UNKNOWN value.
When HCR_EL2.E2H is 1, without explicit synchronization, access from EL2 using the mnemonic CNTHV_CVAL_EL2 or CNTV_CVAL_EL0 are not guaranteed to be ordered with respect to accesses using the other mnemonic.
Accesses to this register use the following encodings:
op0 | op1 | CRn | CRm | op2 |
---|---|---|---|---|
0b11 | 0b100 | 0b1110 | 0b0011 | 0b010 |
if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && HCR_EL2.NV == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else UNDEFINED; elsif PSTATE.EL == EL2 then return CNTHV_CVAL_EL2; elsif PSTATE.EL == EL3 then return CNTHV_CVAL_EL2;
op0 | op1 | CRn | CRm | op2 |
---|---|---|---|---|
0b11 | 0b100 | 0b1110 | 0b0011 | 0b010 |
if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && HCR_EL2.NV == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else UNDEFINED; elsif PSTATE.EL == EL2 then CNTHV_CVAL_EL2 = X[t]; elsif PSTATE.EL == EL3 then CNTHV_CVAL_EL2 = X[t];
op0 | op1 | CRn | CRm | op2 |
---|---|---|---|---|
0b11 | 0b011 | 0b1110 | 0b0011 | 0b010 |
if PSTATE.EL == EL0 then if !(EL2Enabled() && HCR_EL2.<E2H,TGE> == '11') && CNTKCTL_EL1.EL0VTEN == '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' && CNTHCTL_EL2.EL0VTEN == '0' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && HCR_EL2.<E2H,TGE> != '11' && CNTHCTL_EL2.EL1TVT == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && HCR_EL2.<E2H,TGE> == '11' && SCR_EL3.NS == '0' && IsFeatureImplemented(FEAT_SEL2) then return CNTHVS_CVAL_EL2; elsif EL2Enabled() && HCR_EL2.<E2H,TGE> == '11' && SCR_EL3.NS == '1' then return CNTHV_CVAL_EL2; else return CNTV_CVAL_EL0; elsif PSTATE.EL == EL1 then if EL2Enabled() && CNTHCTL_EL2.EL1TVT == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && HCR_EL2.<NV2,NV1,NV> == '111' then return NVMem[0x168]; else return CNTV_CVAL_EL0; elsif PSTATE.EL == EL2 then if HCR_EL2.E2H == '1' && SCR_EL3.NS == '0' && IsFeatureImplemented(FEAT_SEL2) then return CNTHVS_CVAL_EL2; elsif HCR_EL2.E2H == '1' && SCR_EL3.NS == '1' then return CNTHV_CVAL_EL2; else return CNTV_CVAL_EL0; elsif PSTATE.EL == EL3 then return CNTV_CVAL_EL0;
op0 | op1 | CRn | CRm | op2 |
---|---|---|---|---|
0b11 | 0b011 | 0b1110 | 0b0011 | 0b010 |
if PSTATE.EL == EL0 then if !(EL2Enabled() && HCR_EL2.<E2H,TGE> == '11') && CNTKCTL_EL1.EL0VTEN == '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' && CNTHCTL_EL2.EL0VTEN == '0' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && HCR_EL2.<E2H,TGE> != '11' && CNTHCTL_EL2.EL1TVT == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && HCR_EL2.<E2H,TGE> == '11' && SCR_EL3.NS == '0' && IsFeatureImplemented(FEAT_SEL2) then CNTHVS_CVAL_EL2 = X[t]; elsif EL2Enabled() && HCR_EL2.<E2H,TGE> == '11' && SCR_EL3.NS == '1' then CNTHV_CVAL_EL2 = X[t]; else CNTV_CVAL_EL0 = X[t]; elsif PSTATE.EL == EL1 then if EL2Enabled() && CNTHCTL_EL2.EL1TVT == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && HCR_EL2.<NV2,NV1,NV> == '111' then NVMem[0x168] = X[t]; else CNTV_CVAL_EL0 = X[t]; elsif PSTATE.EL == EL2 then if HCR_EL2.E2H == '1' && SCR_EL3.NS == '0' && IsFeatureImplemented(FEAT_SEL2) then CNTHVS_CVAL_EL2 = X[t]; elsif HCR_EL2.E2H == '1' && SCR_EL3.NS == '1' then CNTHV_CVAL_EL2 = X[t]; else CNTV_CVAL_EL0 = X[t]; elsif PSTATE.EL == EL3 then CNTV_CVAL_EL0 = X[t];
3001/0907/2020 15:0757; ccead0cb9f089f9ceec50268e82aec9e7104721180324f0b9997bede489cc15ad1565345720bcd2a
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