TRCIDR4, ID Register 4
The TRCIDR4 characteristics are:
Purpose
Returns the tracing capabilities of the trace unit.
Configuration
AArch64 System register TRCIDR4 bits [31:0] are architecturally mapped to External register TRCIDR4[31:0] .
This register is present only when ETE is implemented. Otherwise, direct accesses to TRCIDR4 are UNDEFINED.
Attributes
TRCIDR4 is a 64-bit register.
Field descriptions
The TRCIDR4 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 |
| RES0 | |||||||||||||||||||||||||||||||
| NUMVMIDC | NUMCIDC | NUMSSCC | NUMRSPAIR | NUMPC | RES0 | SUPPDAC | NUMDVC | NUMACPAIRS | |||||||||||||||||||||||
| 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 |
Bits [63:32]
Reserved, RES0.
NUMVMIDC, bits [31:28]
Indicates the number of Virtual Context Identifier Comparators that are available for tracing.
| NUMVMIDC | Meaning |
|---|---|
| 0b0000 |
No Virtual Context Identifier Comparators are available. |
| 0b0001 |
The implementation has one Virtual Context Identifier Comparator. |
| 0b0010 |
The implementation has two Virtual Context Identifier Comparators. |
| 0b0011 |
The implementation has three Virtual Context Identifier Comparators. |
| 0b0100 |
The implementation has four Virtual Context Identifier Comparators. |
| 0b0101 |
The implementation has five Virtual Context Identifier Comparators. |
| 0b0110 |
The implementation has six Virtual Context Identifier Comparators. |
| 0b0111 |
The implementation has seven Virtual Context Identifier Comparators. |
| 0b1000 |
The implementation has eight Virtual Context Identifier Comparators. |
All other values are reserved.
NUMCIDC, bits [27:24]
Indicates the number of Context Identifier Comparators that are available for tracing.
| NUMCIDC | Meaning |
|---|---|
| 0b0000 |
No Context Identifier Comparators are available. |
| 0b0001 |
The implementation has one Context Identifier Comparator. |
| 0b0010 |
The implementation has two Context Identifier Comparators. |
| 0b0011 |
The implementation has three Context Identifier Comparators. |
| 0b0100 |
The implementation has four Context Identifier Comparators. |
| 0b0101 |
The implementation has five Context Identifier Comparators. |
| 0b0110 |
The implementation has six Context Identifier Comparators. |
| 0b0111 |
The implementation has seven Context Identifier Comparators. |
| 0b1000 |
The implementation has eight Context Identifier Comparators. |
All other values are reserved.
NUMSSCC, bits [23:20]
Indicates the number of Single-shot Comparator Controls that are available for tracing.
| NUMSSCC | Meaning |
|---|---|
| 0b0000 |
No Single-shot Comparator Controls are available. |
| 0b0001 |
The implementation has one Single-shot Comparator Control. |
| 0b0010 |
The implementation has two Single-shot Comparator Controls. |
| 0b0011 |
The implementation has three Single-shot Comparator Controls. |
| 0b0100 |
The implementation has four Single-shot Comparator Controls. |
| 0b0101 |
The implementation has five Single-shot Comparator Controls. |
| 0b0110 |
The implementation has six Single-shot Comparator Controls. |
| 0b0111 |
The implementation has seven Single-shot Comparator Controls. |
| 0b1000 |
The implementation has eight Single-shot Comparator Controls. |
All other values are reserved.
NUMRSPAIR, bits [19:16]
Indicates the number of resource selector pairs that are available for tracing.
| NUMRSPAIR | Meaning |
|---|---|
| 0b0000 |
The implementation has zero resource selectors. |
| 0b0001 |
The implementation has two resource selector pairs. |
| 0b0010 |
The implementation has three resource selector pairs. |
| 0b0011 |
The implementation has four resource selector pairs. |
| 0b0100 |
The implementation has five resource selector pairs. |
| 0b0101 |
The implementation has six resource selector pairs. |
| 0b0110 |
The implementation has seven resource selector pairs. |
| 0b0111 |
The implementation has eight resource selector pairs. |
| 0b1000 |
The implementation has nine resource selector pairs. |
| 0b1001 |
The implementation has ten resource selector pairs. |
| 0b1010 |
The implementation has eleven resource selector pairs. |
| 0b1011 |
The implementation has twelve resource selector pairs. |
| 0b1100 |
The implementation has thirteen resource selector pairs. |
| 0b1101 |
The implementation has fourteen resource selector pairs. |
| 0b1110 |
The implementation has fifteen resource selector pairs. |
| 0b1111 |
The implementation has sixteen resource selector pairs. |
All other values are reserved.
NUMPC, bits [15:12]
Indicates the number of PE Comparator Inputs that are available for tracing.
| NUMPC | Meaning |
|---|---|
| 0b0000 |
No PE Comparator Inputs are available. |
| 0b0001 |
The implementation has one PE Comparator Input. |
| 0b0010 |
The implementation has two PE Comparator Inputs. |
| 0b0011 |
The implementation has three PE Comparator Inputs. |
| 0b0100 |
The implementation has four PE Comparator Inputs. |
| 0b0101 |
The implementation has five PE Comparator Inputs. |
| 0b0110 |
The implementation has six PE Comparator Inputs. |
| 0b0111 |
The implementation has seven PE Comparator Inputs. |
| 0b1000 |
The implementation has eight PE Comparator Inputs. |
All other values are reserved.
Bits [11:9]
Reserved, RES0.
SUPPDAC, bit [8]
When TRCIDR4.NUMACPAIRS != 0b0000:
When TRCIDR4.NUMACPAIRS != 0b0000:
Indicates whether data address comparisons are implemented. Data address comparisons are not implemented in ETE and are reserved for other trace architectures. Allocated in other trace architectures.
| SUPPDAC | Meaning |
|---|---|
| 0b0 |
Data address comparisons not implemented. |
| 0b1 |
Data address comparisons implemented. |
This bit reads as 0b0.
Otherwise:
Otherwise:
Reserved, RES0.
NUMDVC, bits [7:4]
Indicates the number of data value comparators. Data value comparators are not implemented in ETE and are reserved for other trace architectures. Allocated in other trace architectures.
| NUMDVC | Meaning |
|---|---|
| 0b0000 |
No data value comparators implemented. |
| 0b0001 |
One data value comparator implemented. |
| 0b0010 |
Two data value comparators implemented. |
| 0b0011 |
Three data value comparators implemented. |
| 0b0100 |
Four data value comparators implemented. |
| 0b0101 |
Five data value comparators implemented. |
| 0b0110 |
Six data value comparators implemented. |
| 0b0111 |
Seven data value comparators implemented. |
| 0b1000 |
Eight data value comparators implemented. |
All other values are reserved.
This field reads as 0b0000.
NUMACPAIRS, bits [3:0]
Indicates the number of Address Comparator pairs that are available for tracing.
| NUMACPAIRS | Meaning |
|---|---|
| 0b0000 |
No Address Comparator pairs are available. |
| 0b0001 |
The implementation has one Address Comparator pair. |
| 0b0010 |
The implementation has two Address Comparator pairs. |
| 0b0011 |
The implementation has three Address Comparator pairs. |
| 0b0100 |
The implementation has four Address Comparator pairs. |
| 0b0101 |
The implementation has five Address Comparator pairs. |
| 0b0110 |
The implementation has six Address Comparator pairs. |
| 0b0111 |
The implementation has seven Address Comparator pairs. |
| 0b1000 |
The implementation has eight Address Comparator pairs. |
All other values are reserved.
Accessing the TRCIDR4
Accesses to this register use the following encodings:
MRS <Xt>, TRCIDR4
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b10 | 0b001 | 0b0000 | 0b1100 | 0b111 |
if PSTATE.EL == EL0 then
UNDEFINED;
elsif PSTATE.EL == EL1 then
if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && !ELUsingAArch32(EL3) && CPTR_EL3.TTA == '1' then
UNDEFINED;
elsif CPACR_EL1.TTA == '1' then
AArch64.SystemAccessTrap(EL1, 0x18);
elsif EL2Enabled() && !ELUsingAArch32(EL2) && CPTR_EL2.TTA == '1' then
AArch64.SystemAccessTrap(EL2, 0x18);
elsif EL2Enabled() && !ELUsingAArch32(EL2) && (!HaveEL(EL3) || SCR_EL3.FGTEn == '1') && HDFGRTR_EL2.TRCID == '1' then
AArch64.SystemAccessTrap(EL2, 0x18);
elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && CPTR_EL3.TTA == '1' then
if Halted() && EDSCR.SDD == '1' then
UNDEFINED;
else
AArch64.SystemAccessTrap(EL3, 0x18);
else
return TRCIDR4;
elsif PSTATE.EL == EL2 then
if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && !ELUsingAArch32(EL3) && CPTR_EL3.TTA == '1' then
UNDEFINED;
elsif CPTR_EL2.TTA == '1' then
AArch64.SystemAccessTrap(EL2, 0x18);
elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && CPTR_EL3.TTA == '1' then
if Halted() && EDSCR.SDD == '1' then
UNDEFINED;
else
AArch64.SystemAccessTrap(EL3, 0x18);
else
return TRCIDR4;
elsif PSTATE.EL == EL3 then
if CPTR_EL3.TTA == '1' then
AArch64.SystemAccessTrap(EL3, 0x18);
else
return TRCIDR4;