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The CNTHPS_TVAL characteristics are:
Provides AArch32 access to the timer value for the Secure EL2 physical timer.
The Secure EL2 timer is implemented by ARMv8.4-SecEL2. It is only accessible from AArch32 state when EL2 is using AArch64 and the value of SCR_EL3.{EEL2, NS} is {1, 0}.
AArch32 System register CNTHPS_TVAL bits [31:0] are architecturally mapped to AArch64 System register CNTHPS_TVAL_EL2[31:0] .
RW fields in this register reset to architecturally UNKNOWN values.
This register is present only when AArch32 is supported at any Exception level and ARMv8.4-SecEL2 is implemented. Otherwise, direct accesses to CNTHPS_TVAL are UNDEFINED.
CNTHPS_TVAL is a 32-bit register.
The CNTHPS_TVAL bit assignments are:
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 |
TimerValue |
The TimerValue view of the EL2 physical timer.
On a read of this register:
On a write of this register, CNTHPS_CVAL_EL2 is set to (CNTPCT_EL0 + TimerValue), where TimerValue is treated as a signed 32-bit integer.
When CNTHPS_CTL_EL2.ENABLE is 1, the timer condition is met when (CNTPCT_EL0 - CNTHPS_CVAL_EL2) is greater than or equal to zero. This means that TimerValue acts like a 32-bit downcounter timer. When the timer condition is met:
When CNTHPS_CTL_EL2.ENABLE is 0, the timer condition is not met, but CNTPCT_EL0 continues to count, so the TimerValue view appears to continue to count down.
This field resets to an architecturally UNKNOWN value.
This register is accessed using the encoding for CNTP_TVAL.
Accesses to this register use the following encodings:
coproc | opc1 | CRn | CRm | opc2 |
---|---|---|---|---|
0b1111 | 0b000 | 0b1110 | 0b0010 | 0b000 |
if PSTATE.EL == EL0 then
if !ELUsingAArch32(EL1) && !(EL2Enabled() && HCR_EL2.<E2H,TGE> == '11') && CNTKCTL_EL1.EL0PTEN == '0' then
if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
else
AArch64.AArch32SystemAccessTrap(EL1, 0x03);
elsif ELUsingAArch32(EL1) && CNTKCTL.PL0PTEN == '0' then
if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && ELUsingAArch32(EL2) && HCR.TGE == '1' then
AArch32.TakeHypTrapException(0x00);
else
UNDEFINED;
elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.E2H == '0' && CNTHCTL_EL2.EL1PCEN == '0' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.<E2H,TGE> == '10' && CNTHCTL_EL2.EL1PTEN == '0' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.<E2H,TGE> == '11' && CNTHCTL_EL2.EL0PTEN == '0' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && ELUsingAArch32(EL2) && CNTHCTL.PL1PCEN == '0' then
AArch32.TakeHypTrapException(0x03);
elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.<E2H,TGE> == '11' && SCR_EL3.NS == '0' && IsFeatureImplemented("ARMv8.4-SecEL2") then
return CNTHPS_TVAL_EL2;
elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.<E2H,TGE> == '11' && SCR_EL3.NS == '1' then
return CNTHP_TVAL_EL2;
else
return CNTP_TVAL;
elsif PSTATE.EL == EL1 then
if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.E2H == '0' && CNTHCTL_EL2.EL1PCEN == '0' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.E2H == '1' && CNTHCTL_EL2.EL1PTEN == '0' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && ELUsingAArch32(EL2) && CNTHCTL.PL1PCEN == '0' then
AArch32.TakeHypTrapException(0x03);
elsif HaveEL(EL3) && ELUsingAArch32(EL3) then
if SCR.NS == '0' then
return CNTP_TVAL_S;
else
return CNTP_TVAL_NS;
else
return CNTP_TVAL;
elsif PSTATE.EL == EL2 then
if HaveEL(EL3) && ELUsingAArch32(EL3) then
return CNTP_TVAL_NS;
else
return CNTP_TVAL;
elsif PSTATE.EL == EL3 then
if SCR.NS == '0' then
return CNTP_TVAL_S;
else
return CNTP_TVAL_NS;
coproc | opc1 | CRn | CRm | opc2 |
---|---|---|---|---|
0b1111 | 0b000 | 0b1110 | 0b0010 | 0b000 |
if PSTATE.EL == EL0 then
if !ELUsingAArch32(EL1) && !(EL2Enabled() && HCR_EL2.<E2H,TGE> == '11') && CNTKCTL_EL1.EL0PTEN == '0' then
if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
else
AArch64.AArch32SystemAccessTrap(EL1, 0x03);
elsif ELUsingAArch32(EL1) && CNTKCTL.PL0PTEN == '0' then
if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.TGE == '1' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && ELUsingAArch32(EL2) && HCR.TGE == '1' then
AArch32.TakeHypTrapException(0x00);
else
UNDEFINED;
elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.E2H == '0' && CNTHCTL_EL2.EL1PCEN == '0' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.<E2H,TGE> == '10' && CNTHCTL_EL2.EL1PTEN == '0' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.<E2H,TGE> == '11' && CNTHCTL_EL2.EL0PTEN == '0' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && ELUsingAArch32(EL2) && CNTHCTL.PL1PCEN == '0' then
AArch32.TakeHypTrapException(0x03);
elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.<E2H,TGE> == '11' && SCR_EL3.NS == '0' && IsFeatureImplemented("ARMv8.4-SecEL2") then
CNTHPS_TVAL_EL2 = R[t];
elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.<E2H,TGE> == '11' && SCR_EL3.NS == '1' then
CNTHP_TVAL_EL2 = R[t];
else
CNTP_TVAL = R[t];
elsif PSTATE.EL == EL1 then
if EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.E2H == '0' && CNTHCTL_EL2.EL1PCEN == '0' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && !ELUsingAArch32(EL2) && HCR_EL2.E2H == '1' && CNTHCTL_EL2.EL1PTEN == '0' then
AArch64.AArch32SystemAccessTrap(EL2, 0x03);
elsif EL2Enabled() && ELUsingAArch32(EL2) && CNTHCTL.PL1PCEN == '0' then
AArch32.TakeHypTrapException(0x03);
elsif HaveEL(EL3) && ELUsingAArch32(EL3) then
if SCR.NS == '0' then
CNTP_TVAL_S = R[t];
else
CNTP_TVAL_NS = R[t];
else
CNTP_TVAL = R[t];
elsif PSTATE.EL == EL2 then
if HaveEL(EL3) && ELUsingAArch32(EL3) then
CNTP_TVAL_NS = R[t];
else
CNTP_TVAL = R[t];
elsif PSTATE.EL == EL3 then
if SCR.NS == '0' then
CNTP_TVAL_S = R[t];
else
CNTP_TVAL_NS = R[t];
1327/1209/2019 1518:1348; 391b5248b29fb2f001ef74792eaacbd6fc72f2116134483bd14dc8c12a99c984cbfe3431cc1c9707
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