Provides EL2 controls for Trace.
AArch64 System register TRFCR_EL2 bits [31:0] are architecturally mapped to AArch32 System register HTRFCR[31:0].
This register is present only when FEAT_TRF is implemented. Otherwise, direct accesses to TRFCR_EL2 are UNDEFINED.
If EL2 is not implemented, this register is RES0 from EL3.
TRFCR_EL2 is a 64-bit register.
| 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 |
| 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 |
| RES0 | |||||||||||||||||||||||||||||||
| RES0 | TS | RES0 | CX | RES0 | E2TRE | E0HTRE | |||||||||||||||||||||||||
Reserved, RES0.
Timestamp Control. Controls which timebase is used for trace timestamps.
| TS | Meaning | Applies when |
|---|---|---|
| 0b00 | ||
| 0b01 |
Virtual timestamp. The traced timestamp is the physical counter value minus the value of CNTVOFF_EL2. | |
| 0b10 | Guest physical timestamp. The traced timestamp is the physical counter value minus a physical offset. If any of the following are true, the physical offset is zero, otherwise the physical offset is the value of CNTPOFF_EL2:
| When FEAT_ECV is implemented |
| 0b11 |
Physical timestamp. The traced timestamp is the physical counter value. |
This field is ignored by the PE when SelfHostedTraceEnabled() == FALSE.
The reset behavior of this field is:
Reserved, RES0.
CONTEXTIDR_EL2 and VMID trace enable.
| CX | Meaning |
|---|---|
| 0b0 |
CONTEXTIDR_EL2 and VMID trace prohibited. |
| 0b1 |
CONTEXTIDR_EL2 and VMID trace allowed. |
This field is ignored if SelfHostedTraceEnabled() == FALSE.
The reset behavior of this field is:
Reserved, RES0.
EL2 Trace Enable.
| E2TRE | Meaning |
|---|---|
| 0b0 |
Trace is prohibited at EL2. |
| 0b1 |
Trace is allowed at EL2. |
This field is ignored if SelfHostedTraceEnabled() == FALSE.
The reset behavior of this field is:
EL0 Trace Enable.
| E0HTRE | Meaning |
|---|---|
| 0b0 |
Trace is prohibited at EL0 when HCR_EL2.TGE == 1. |
| 0b1 |
Trace is allowed at EL0 when HCR_EL2.TGE == 1. |
This field is ignored if any of the following are true:
The reset behavior of this field is:
Accesses to this register use the following encodings in the System register encoding space:
MRS <Xt>, TRFCR_EL2
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b11 | 0b100 | 0b0001 | 0b0010 | 0b001 |
if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EffectiveHCR_EL2_NVx() IN {'xx1'} then AArch64.SystemAccessTrap(EL2, 0x18); else UNDEFINED; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3.TTRF == '1' then UNDEFINED; elsif HaveEL(EL3) && MDCR_EL3.TTRF == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else X[t, 64] = TRFCR_EL2; elsif PSTATE.EL == EL3 then X[t, 64] = TRFCR_EL2;
MSR TRFCR_EL2, <Xt>
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b11 | 0b100 | 0b0001 | 0b0010 | 0b001 |
if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EffectiveHCR_EL2_NVx() IN {'xx1'} then AArch64.SystemAccessTrap(EL2, 0x18); else UNDEFINED; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3.TTRF == '1' then UNDEFINED; elsif HaveEL(EL3) && MDCR_EL3.TTRF == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else TRFCR_EL2 = X[t, 64]; elsif PSTATE.EL == EL3 then TRFCR_EL2 = X[t, 64];
When FEAT_VHE is implementedMRS <Xt>, TRFCR_EL1
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b11 | 0b000 | 0b0001 | 0b0010 | 0b001 |
if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3.TTRF == '1' then UNDEFINED; elsif EL2Enabled() && MDCR_EL2.TTRF == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && MDCR_EL3.TTRF == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif EffectiveHCR_EL2_NVx() == '111' then X[t, 64] = NVMem[0x880]; else X[t, 64] = TRFCR_EL1; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3.TTRF == '1' then UNDEFINED; elsif HaveEL(EL3) && MDCR_EL3.TTRF == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif ELIsInHost(EL2) then X[t, 64] = TRFCR_EL2; else X[t, 64] = TRFCR_EL1; elsif PSTATE.EL == EL3 then X[t, 64] = TRFCR_EL1;
When FEAT_VHE is implementedMSR TRFCR_EL1, <Xt>
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b11 | 0b000 | 0b0001 | 0b0010 | 0b001 |
if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3.TTRF == '1' then UNDEFINED; elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HDFGWTR_EL2.TRFCR_EL1 == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && MDCR_EL2.TTRF == '1' then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && MDCR_EL3.TTRF == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif EffectiveHCR_EL2_NVx() == '111' then NVMem[0x880] = X[t, 64]; else TRFCR_EL1 = X[t, 64]; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3.TTRF == '1' then UNDEFINED; elsif HaveEL(EL3) && MDCR_EL3.TTRF == '1' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif ELIsInHost(EL2) then TRFCR_EL2 = X[t, 64]; else TRFCR_EL1 = X[t, 64]; elsif PSTATE.EL == EL3 then TRFCR_EL1 = X[t, 64];