Locks out the external debug interface.
AArch32 System register DBGOSDLR bits [31:0] are architecturally mapped to AArch64 System register OSDLR_EL1[31:0].
This register is present only when EL1 is capable of using AArch32. Otherwise, direct accesses to DBGOSDLR are UNDEFINED.
DBGOSDLR 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 | DLK | ||||||||||||||||||||||||||||||
Reserved, RES0.
OS Double Lock control bit.
| DLK | Meaning |
|---|---|
| 0b0 |
OS Double Lock unlocked. |
| 0b1 |
OS Double Lock locked, if DBGPRCR.CORENPDRQ (Core no powerdown request) bit is set to 0 and the PE is in Non-debug state. |
The reset behavior of this field is:
Reserved, RAZ/WI.
Accesses to this register use the following encodings in the System register encoding space:
MRC{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}
| coproc | opc1 | CRn | CRm | opc2 |
|---|---|---|---|---|
| 0b1110 | 0b000 | 0b0001 | 0b0011 | 0b100 |
if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && !ELUsingAArch32(EL3) && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then UNDEFINED; elsif EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.<TDE,TDOSA> != '00' && (IsFeatureImplemented(FEAT_DoubleLock) || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL2.TDOSA") then AArch64.AArch32SystemAccessTrap(EL2, 0x05); elsif EL2Enabled() && ELUsingAArch32(EL2) && HDCR.<TDE,TDOSA> != '00' && (IsFeatureImplemented(FEAT_DoubleLock) || boolean IMPLEMENTATION_DEFINED "Trapped by HDCR.TDOSA") then AArch32.TakeHypTrapException(0x05); elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then if EL3SDDUndef() then UNDEFINED; else AArch64.AArch32SystemAccessTrap(EL3, 0x05); else R[t] = DBGOSDLR; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && !ELUsingAArch32(EL3) && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then UNDEFINED; elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then if EL3SDDUndef() then UNDEFINED; else AArch64.AArch32SystemAccessTrap(EL3, 0x05); else R[t] = DBGOSDLR; elsif PSTATE.EL == EL3 then R[t] = DBGOSDLR;
MCR{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}
| coproc | opc1 | CRn | CRm | opc2 |
|---|---|---|---|---|
| 0b1110 | 0b000 | 0b0001 | 0b0011 | 0b100 |
if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && !ELUsingAArch32(EL3) && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then UNDEFINED; elsif EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.<TDE,TDOSA> != '00' && (IsFeatureImplemented(FEAT_DoubleLock) || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL2.TDOSA") then AArch64.AArch32SystemAccessTrap(EL2, 0x05); elsif EL2Enabled() && ELUsingAArch32(EL2) && HDCR.<TDE,TDOSA> != '00' && (IsFeatureImplemented(FEAT_DoubleLock) || boolean IMPLEMENTATION_DEFINED "Trapped by HDCR.TDOSA") then AArch32.TakeHypTrapException(0x05); elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then if EL3SDDUndef() then UNDEFINED; else AArch64.AArch32SystemAccessTrap(EL3, 0x05); else DBGOSDLR = R[t]; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && !ELUsingAArch32(EL3) && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then UNDEFINED; elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then if EL3SDDUndef() then UNDEFINED; else AArch64.AArch32SystemAccessTrap(EL3, 0x05); else DBGOSDLR = R[t]; elsif PSTATE.EL == EL3 then DBGOSDLR = R[t];