TRCOSLSR, Trace OS Lock Status Register

The TRCOSLSR characteristics are:

Purpose

Returns the status of the Trace OS Lock.

External register TRCOSLSR bits [31:0] are architecturally mapped to AArch64 System register TRCOSLSR[31:0].

This register is present only when FEAT_ETE is implemented and FEAT_TRC_EXT is implemented. Otherwise, direct accesses to TRCOSLSR are RES0.

TRCOSLSR is a 32-bit register.

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																											OSLM[2:1]		RES0	OSLK	OSLM[0]

Reserved, RES0.

OS Lock model.

The value of this field is an IMPLEMENTATION DEFINED choice of:

OSLM	Meaning
0b000	Trace OS Lock is not implemented.
0b010	Trace OS Lock is implemented.
0b100	Trace OS Lock is not implemented, and the trace unit is controlled by the PE OS Lock.

All other values are reserved.

When FEAT_ETE is implemented, the values 0b000 and 0b010 are not permitted.

The OSLM field is split as follows:

Access to this field is RO.

Reserved, RES0.

OS Lock status.

OSLK	Meaning
0b0	The OS Lock is unlocked.
0b1	The OS Lock is locked.

Note

This field indicates the state of the PE OS Lock.

External debugger accesses to this register are unaffected by the OS Lock.

Component	Offset	Instance
ETE	0x304	TRCOSLSR

This interface is accessible as follows:

When !AllowExternalTraceAccess() or !IsTraceCorePowered(), accesses to this register generate an error response.
Otherwise, accesses to this register are RO.

26/03/2024 09:49; 67c0ae5282a7629ba0ea0ba7267b43cd4f7939f6