The CNTHPS_TVAL characteristics are:
Provides AArch32 access from EL0 to the timer value for the Secure EL2 physical timer.
This register is banked between CNTHPS_TVAL and CNTHPS_TVAL_S and CNTHPS_TVAL_NS.
AArch32 System register CNTHPS_TVAL bits [31:0] are architecturally mapped to AArch64 System register CNTHPS_TVAL_EL2[31:0].
This register is present only when AArch32 is supported and FEAT_SEL2 is implemented. Otherwise, direct accesses to CNTHPS_TVAL are UNDEFINED.
CNTHPS_TVAL is a 32-bit register.
This register has the following instances:
| 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 is set to (CNTPCT + TimerValue), where TimerValue is treated as a signed 32-bit integer.
When CNTHPS_CTL.ENABLE is 1, the timer condition is met when (CNTPCT - CNTHPS_CVAL) 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.ENABLE is 0, the TimerValue cannot be read but continues to decrement. When the timer is enabled, the TimerValue represents the elapsed time whether that time was spent enabled or disabled.
The reset behavior of this field is:
This register is accessed using the encoding for CNTP_TVAL.
Accesses to this register use the following encodings in the System register encoding space:
| coproc | opc1 | CRn | CRm | opc2 |
|---|---|---|---|---|
| 0b1111 | 0b000 | 0b1110 | 0b0010 | 0b000 |
if PSTATE.EL == EL0 then if !ELUsingAArch32(EL1) && !ELIsInHost(EL0) && 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) && !ELIsInHost(EL2) && CNTHCTL_EL2.EL1PCEN == '0' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif ELIsInHost(EL2) && HCR_EL2.TGE == '0' && CNTHCTL_EL2.EL1PTEN == '0' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif ELIsInHost(EL0) && CNTHCTL_EL2.EL0PTEN == '0' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && CNTHCTL.PL1PCEN == '0' then AArch32.TakeHypTrapException(0x03); elsif ELIsInHost(EL0) && IsCurrentSecurityState(SS_Secure) && IsFeatureImplemented(FEAT_SEL2) then if CNTHPS_CTL_EL2.ENABLE == '0' then R[t] = bits(32) UNKNOWN; else R[t] = (CNTHPS_CVAL_EL2 - PhysicalCountInt())<31:0>; elsif ELIsInHost(EL0) && !IsCurrentSecurityState(SS_Secure) then if CNTHP_CTL_EL2.ENABLE == '0' then R[t] = bits(32) UNKNOWN; else R[t] = (CNTHP_CVAL_EL2 - PhysicalCountInt())<31:0>; elsif IsFeatureImplemented(FEAT_ECV) && EL2Enabled() && !ELUsingAArch32(EL2) && SCR_EL3.ECVEn == '1' && CNTHCTL_EL2.ECV == '1' && !ELIsInHost(EL0) then if CNTP_CTL.ENABLE == '0' then R[t] = bits(32) UNKNOWN; else R[t] = (CNTP_CVAL - (PhysicalCountInt() - CNTPOFF_EL2))<31:0>; elsif HaveEL(EL3) && ELUsingAArch32(EL3) then if SCR.NS == '1' then if CNTP_CTL_NS.ENABLE == '0' then R[t] = bits(32) UNKNOWN; else R[t] = (CNTP_CVAL_NS - PhysicalCountInt())<31:0>; else if CNTP_CTL_S.ENABLE == '0' then R[t] = bits(32) UNKNOWN; else R[t] = (CNTP_CVAL_S - PhysicalCountInt())<31:0>; else if CNTP_CTL.ENABLE == '0' then R[t] = bits(32) UNKNOWN; else R[t] = (CNTP_CVAL - PhysicalCountInt())<31:0>; elsif PSTATE.EL == EL1 then if EL2Enabled() && !ELUsingAArch32(EL2) && !ELIsInHost(EL2) && CNTHCTL_EL2.EL1PCEN == '0' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif ELIsInHost(EL2) && CNTHCTL_EL2.EL1PTEN == '0' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && CNTHCTL.PL1PCEN == '0' then AArch32.TakeHypTrapException(0x03); elsif IsFeatureImplemented(FEAT_ECV) && EL2Enabled() && !ELUsingAArch32(EL2) && SCR_EL3.ECVEn == '1' && CNTHCTL_EL2.ECV == '1' then if CNTP_CTL.ENABLE == '0' then R[t] = bits(32) UNKNOWN; else R[t] = (CNTP_CVAL - (PhysicalCountInt() - CNTPOFF_EL2))<31:0>; elsif HaveEL(EL3) && ELUsingAArch32(EL3) then if CNTP_CTL_NS.ENABLE == '0' then R[t] = bits(32) UNKNOWN; else R[t] = (CNTP_CVAL_NS - PhysicalCountInt())<31:0>; else if CNTP_CTL.ENABLE == '0' then R[t] = bits(32) UNKNOWN; else R[t] = (CNTP_CVAL - PhysicalCountInt())<31:0>; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && ELUsingAArch32(EL3) then if CNTP_CTL_NS.ENABLE == '0' then R[t] = bits(32) UNKNOWN; else R[t] = (CNTP_CVAL_NS - PhysicalCountInt())<31:0>; else if CNTP_CTL.ENABLE == '0' then R[t] = bits(32) UNKNOWN; else R[t] = (CNTP_CVAL - PhysicalCountInt())<31:0>; elsif PSTATE.EL == EL3 then if SCR.NS == '0' then if CNTP_CTL_S.ENABLE == '0' then R[t] = bits(32) UNKNOWN; else R[t] = (CNTP_CVAL_S - PhysicalCountInt())<31:0>; else if CNTP_CTL_NS.ENABLE == '0' then R[t] = bits(32) UNKNOWN; else R[t] = (CNTP_CVAL_NS - PhysicalCountInt())<31:0>;
| coproc | opc1 | CRn | CRm | opc2 |
|---|---|---|---|---|
| 0b1111 | 0b000 | 0b1110 | 0b0010 | 0b000 |
if PSTATE.EL == EL0 then if !ELUsingAArch32(EL1) && !ELIsInHost(EL0) && 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) && !ELIsInHost(EL2) && CNTHCTL_EL2.EL1PCEN == '0' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif ELIsInHost(EL2) && HCR_EL2.TGE == '0' && CNTHCTL_EL2.EL1PTEN == '0' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif ELIsInHost(EL0) && CNTHCTL_EL2.EL0PTEN == '0' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && CNTHCTL.PL1PCEN == '0' then AArch32.TakeHypTrapException(0x03); elsif ELIsInHost(EL0) && IsCurrentSecurityState(SS_Secure) && IsFeatureImplemented(FEAT_SEL2) then CNTHPS_CVAL_EL2 = SignExtend(R[t], 64) + PhysicalCountInt(); elsif ELIsInHost(EL0) && !IsCurrentSecurityState(SS_Secure) then CNTHP_CVAL_EL2 = SignExtend(R[t], 64) + PhysicalCountInt(); elsif IsFeatureImplemented(FEAT_ECV) && EL2Enabled() && !ELUsingAArch32(EL2) && SCR_EL3.ECVEn == '1' && CNTHCTL_EL2.ECV == '1' && !ELIsInHost(EL0) then CNTP_CVAL = (SignExtend(R[t], 64) + PhysicalCountInt()) - CNTPOFF_EL2; elsif HaveEL(EL3) && ELUsingAArch32(EL3) then if SCR.NS == '1' then CNTP_CVAL_NS = SignExtend(R[t], 64) + PhysicalCountInt(); else CNTP_CVAL_S = SignExtend(R[t], 64) + PhysicalCountInt(); else CNTP_CVAL = SignExtend(R[t], 64) + PhysicalCountInt(); elsif PSTATE.EL == EL1 then if EL2Enabled() && !ELUsingAArch32(EL2) && !ELIsInHost(EL2) && CNTHCTL_EL2.EL1PCEN == '0' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif ELIsInHost(EL2) && CNTHCTL_EL2.EL1PTEN == '0' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && CNTHCTL.PL1PCEN == '0' then AArch32.TakeHypTrapException(0x03); elsif IsFeatureImplemented(FEAT_ECV) && EL2Enabled() && !ELUsingAArch32(EL2) && SCR_EL3.ECVEn == '1' && CNTHCTL_EL2.ECV == '1' then CNTP_CVAL = (SignExtend(R[t], 64) + PhysicalCountInt()) - CNTPOFF_EL2; elsif HaveEL(EL3) && ELUsingAArch32(EL3) then CNTP_CVAL_NS = SignExtend(R[t], 64) + PhysicalCountInt(); else CNTP_CVAL = SignExtend(R[t], 64) + PhysicalCountInt(); elsif PSTATE.EL == EL2 then if HaveEL(EL3) && ELUsingAArch32(EL3) then CNTP_CVAL_NS = SignExtend(R[t], 64) + PhysicalCountInt(); else CNTP_CVAL = SignExtend(R[t], 64) + PhysicalCountInt(); elsif PSTATE.EL == EL3 then if SCR.NS == '0' then CNTP_CVAL_S = SignExtend(R[t], 64) + PhysicalCountInt(); else CNTP_CVAL_NS = SignExtend(R[t], 64) + PhysicalCountInt();
26/03/2024 09:49; 67c0ae5282a7629ba0ea0ba7267b43cd4f7939f6
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