TRCIDR2 Trace ID Register 2 when FEAT_ETE is implemented and FEAT_TRC_EXT is implemented ETE 0x1E8 TRCIDR2 When OSLockStatus() or !IsTraceCorePowered() ERROR RO TRCIDR2 Architectural AArch64 31 0 31 0 31 0 31 0 Returns the tracing capabilities of the trace unit. Trace TRCIDR2 is a 32-bit register. WFXMODE 31 31 31 Indicates whether WFI, WFIT, WFE, and WFET instructions are classified as P0 instructions: 0b0 WFI, WFIT, WFE, and WFET instructions are not classified as P0 instructions. 0b1 WFI, WFIT, WFE, and WFET instructions are classified as P0 instructions. RO VMIDOPT 30 29 30:29 Indicates the options for Virtual context identifier selection. All other values are reserved. If TRCIDR2.VMIDSIZE == 0b00000 then this field is 0b00. If TRCIDR2.VMIDSIZE != 0b00000 then this field is 0b10. 0b00 Virtual context identifier selection not supported. TRCCONFIGR.VMIDOPT is RES0. 0b01 Virtual context identifier selection supported. TRCCONFIGR.VMIDOPT is implemented. 0b10 Virtual context identifier selection not supported. TRCCONFIGR.VMIDOPT is RES1. RO CCSIZE 28 25 3:0 Indicates the size of the cycle counter. All other values are reserved. 0b0000 The cycle counter is 12 bits in length. 0b0001 The cycle counter is 13 bits in length. 0b0010 The cycle counter is 14 bits in length. 0b0011 The cycle counter is 15 bits in length. 0b0100 The cycle counter is 16 bits in length. 0b0101 The cycle counter is 17 bits in length. 0b0110 The cycle counter is 18 bits in length. 0b0111 The cycle counter is 19 bits in length. 0b1000 The cycle counter is 20 bits in length. RO When TRCIDR0.TRCCCI == '1' 28 25 28:25 Reserved, RES0. Otherwise DVSIZE 24 20 4:0 Indicates the data value size in bytes. Data tracing is not implemented in ETE and this field is reserved for other trace architectures. Allocated in other trace architectures. All other values are reserved. 0b00000 Data value tracing not implemented. 0b00100 Data value tracing has a maximum of 32-bit data values. 0b01000 Data value tracing has a maximum of 64-bit data values. RO When TRCIDR0.TRCDATA != '00' 24 20 24:20 Reserved, RES0. Otherwise DASIZE 19 15 4:0 Indicates the data address size in bytes. Data tracing is not implemented in ETE and this field is reserved for other trace architectures. Allocated in other trace architectures. All other values are reserved. 0b00000 Data address tracing not implemented. 0b00100 Data address tracing has a maximum of 32-bit data addresses. 0b01000 Data address tracing has a maximum of 64-bit data addresses. RO When TRCIDR0.TRCDATA != '00' 19 15 19:15 Reserved, RES0. Otherwise VMIDSIZE 14 10 14:10 Indicates the trace unit Virtual context identifier size. All other values are reserved. If the PE does not implement EL2 then this field is 0b00000. If the PE implements EL2 then this field is 0b00100. 0b00000 Virtual context identifier tracing is not supported. 0b00001 8-bit Virtual context identifier size. 0b00010 16-bit Virtual context identifier size. 0b00100 32-bit Virtual context identifier size. RO CIDSIZE 9 5 9:5 Indicates the Context identifier size. All other values are reserved. This field reads as 0b00100. 0b00000 Context identifier tracing is not supported. 0b00100 32-bit Context identifier size. RO IASIZE 4 0 4:0 Virtual instruction address size. All other values are reserved. This field reads as 0b01000. 0b00100 Maximum of 32-bit instruction address size. 0b01000 Maximum of 64-bit instruction address size. RO 2026-03-26 20:27:25 2026-03_rel