DBGOSDLR, Debug OS Double Lock Register
The DBGOSDLR characteristics are:
Purpose
Locks out the external debug interface.
Configuration
AArch32 System register DBGOSDLR bits [31:0] are architecturally mapped to AArch64 System register OSDLR_EL1[31:0] .
This register is present only when AArch32 is supported at any Exception level. Otherwise, direct accesses to DBGOSDLR are UNKNOWN.
Attributes
DBGOSDLR is a 32-bit register.
Field descriptions
The DBGOSDLR bit assignments are:
Bits [31:1]
Reserved, RES0.
DLK, bit [0]
When ARMv8.0-DoubleLock is implemented:
When ARMv8.0-DoubleLock is implemented:
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. |
On a Warm reset, this field resets to 0.
Otherwise:
Otherwise:
Reserved, RAZ/WI.
Accessing the DBGOSDLR
Accesses to this register use the following encodings:
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 Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && !ELUsingAArch32(EL3) && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented("ARMv8.0-DoubleLock") || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then UNDEFINED; elsif EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.<TDE,TDOSA> != '00' && (IsFeatureImplemented("ARMv8.0-DoubleLock") || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL2.TDOSA") then AArch64.AArch32SystemAccessTrap(EL2, 0x05); elsif EL2Enabled() && ELUsingAArch32(EL2) && HDCR.<TDE,TDOSA> != '00' && (IsFeatureImplemented("ARMv8.0-DoubleLock") || boolean IMPLEMENTATION_DEFINED "Trapped by HDCR.TDOSA") then AArch32.TakeHypTrapException(0x05); elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented("ARMv8.0-DoubleLock") || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then if Halted() && EDSCR.SDD == '1' then UNDEFINED; else AArch64.AArch32SystemAccessTrap(EL3, 0x05); else return DBGOSDLR; elsif PSTATE.EL == EL2 then if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && !ELUsingAArch32(EL3) && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented("ARMv8.0-DoubleLock") || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then UNDEFINED; elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented("ARMv8.0-DoubleLock") || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then if Halted() && EDSCR.SDD == '1' then UNDEFINED; else AArch64.AArch32SystemAccessTrap(EL3, 0x05); else return DBGOSDLR; elsif PSTATE.EL == EL3 then return 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 Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && !ELUsingAArch32(EL3) && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented("ARMv8.0-DoubleLock") || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then UNDEFINED; elsif EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.<TDE,TDOSA> != '00' && (IsFeatureImplemented("ARMv8.0-DoubleLock") || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL2.TDOSA") then AArch64.AArch32SystemAccessTrap(EL2, 0x05); elsif EL2Enabled() && ELUsingAArch32(EL2) && HDCR.<TDE,TDOSA> != '00' && (IsFeatureImplemented("ARMv8.0-DoubleLock") || boolean IMPLEMENTATION_DEFINED "Trapped by HDCR.TDOSA") then AArch32.TakeHypTrapException(0x05); elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented("ARMv8.0-DoubleLock") || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then if Halted() && EDSCR.SDD == '1' then UNDEFINED; else AArch64.AArch32SystemAccessTrap(EL3, 0x05); else DBGOSDLR = R[t]; elsif PSTATE.EL == EL2 then if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && !ELUsingAArch32(EL3) && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented("ARMv8.0-DoubleLock") || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then UNDEFINED; elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented("ARMv8.0-DoubleLock") || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then if Halted() && EDSCR.SDD == '1' then UNDEFINED; else AArch64.AArch32SystemAccessTrap(EL3, 0x05); else DBGOSDLR = R[t]; elsif PSTATE.EL == EL3 then DBGOSDLR = R[t];