OSDLR_EL1

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OSDLR_EL1, OS Double Lock Register

Purpose

Configuration

AArch64 System register OSDLR_EL1 bits [31:0] are architecturally mapped to AArch32 System register DBGOSDLR[31:0].

This register is present only when FEAT_AA64 is implemented. Otherwise, direct accesses to OSDLR_EL1 are UNDEFINED.

Attributes

Field descriptions

Bits [63:1]

DLK, bit [0]
When FEAT_DoubleLock is implemented:

DLK	Meaning
0b0	OS Double Lock unlocked.
0b1	OS Double Lock locked, if DBGPRCR_EL1.CORENPDRQ (Core no powerdown request) bit is set to 0 and the PE is in Non-debug state.

Otherwise:

Accessing OSDLR_EL1

Accesses to this register use the following encodings in the System register encoding space:

MRS <Xt>, OSDLR_EL1

op0	op1	CRn	CRm	op2
0b10	0b000	0b0001	0b0011	0b100

if !IsFeatureImplemented(FEAT_AA64) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3().TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by MDCR_EL3.TDOSA")) then Undefined(); elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3().FGTEn == '1') && IsFeatureImplemented(FEAT_DoubleLock) && HDFGRTR_EL2().OSDLR_EL1 == '1' then AArch64_SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && MDCR_EL2().[TDE,TDOSA] != '00' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by MDCR_EL2.TDOSA")) then AArch64_SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && MDCR_EL3().TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by MDCR_EL3.TDOSA")) then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else X{64}(t) = OSDLR_EL1(); end; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3().TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by MDCR_EL3.TDOSA")) then Undefined(); elsif HaveEL(EL3) && MDCR_EL3().TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by MDCR_EL3.TDOSA")) then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else X{64}(t) = OSDLR_EL1(); end; elsif PSTATE.EL == EL3 then X{64}(t) = OSDLR_EL1(); end;

MSR OSDLR_EL1, <Xt>

op0	op1	CRn	CRm	op2
0b10	0b000	0b0001	0b0011	0b100

if !IsFeatureImplemented(FEAT_AA64) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3().TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by MDCR_EL3.TDOSA")) then Undefined(); elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT) && (!HaveEL(EL3) || SCR_EL3().FGTEn == '1') && IsFeatureImplemented(FEAT_DoubleLock) && HDFGWTR_EL2().OSDLR_EL1 == '1' then AArch64_SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && MDCR_EL2().[TDE,TDOSA] != '00' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by MDCR_EL2.TDOSA")) then AArch64_SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && MDCR_EL3().TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by MDCR_EL3.TDOSA")) then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else OSDLR_EL1() = X{64}(t); end; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && MDCR_EL3().TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by MDCR_EL3.TDOSA")) then Undefined(); elsif HaveEL(EL3) && MDCR_EL3().TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || ImpDefBool("Trapped by MDCR_EL3.TDOSA")) then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else OSDLR_EL1() = X{64}(t); end; elsif PSTATE.EL == EL3 then OSDLR_EL1() = X{64}(t); end;

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																															DLK