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OSDLR_EL1, OS Double Lock Register
The OSDLR_EL1 characteristics are:
Purpose
Used to control the OS Double Lock.
Configuration
AArch64 System register OSDLR_EL1 bits [31:0] are architecturally mapped to AArch32 System register DBGOSDLR[31:0] .
Attributes
OSDLR_EL1 is a 64-bit register.
Field descriptions
The OSDLR_EL1 bit assignments are:
| 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 |
| RES0 | |||||||||||||||||||||||||||||||
| RES0 | DLK | ||||||||||||||||||||||||||||||
| 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 |
Bits [63:1]
Reserved, RES0.
DLK, bit [0]
When FEAT_DoubleLock is implemented:
When FEAT_DoubleLock is implemented:
OS Double Lock control bit.
| 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. |
On a Warm reset, this field resets to 0.
Otherwise:
Otherwise:
Reserved, RAZ/WI.
Accessing the OSDLR_EL1
Accesses to this register use the following encodings:
MRS <Xt>, OSDLR_EL1
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b10 | 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'" && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then
UNDEFINED;
elsif EL2Enabled() && (!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) || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL2.TDOSA") then
AArch64.SystemAccessTrap(EL2, 0x18);
elsif HaveEL(EL3) && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then
if Halted() && EDSCR.SDD == '1' then
UNDEFINED;
else
AArch64.SystemAccessTrap(EL3, 0x18);
else
return OSDLR_EL1;
elsif PSTATE.EL == EL2 then
if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then
UNDEFINED;
elsif HaveEL(EL3) && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then
if Halted() && EDSCR.SDD == '1' then
UNDEFINED;
else
AArch64.SystemAccessTrap(EL3, 0x18);
else
return OSDLR_EL1;
elsif PSTATE.EL == EL3 then
return OSDLR_EL1;
MSR OSDLR_EL1, <Xt>
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b10 | 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'" && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then
UNDEFINED;
elsif EL2Enabled() && (!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) || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL2.TDOSA") then
AArch64.SystemAccessTrap(EL2, 0x18);
elsif HaveEL(EL3) && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then
if Halted() && EDSCR.SDD == '1' then
UNDEFINED;
else
AArch64.SystemAccessTrap(EL3, 0x18);
else
OSDLR_EL1 = X[t];
elsif PSTATE.EL == EL2 then
if Halted() && HaveEL(EL3) && EDSCR.SDD == '1' && boolean IMPLEMENTATION_DEFINED "EL3 trap priority when SDD == '1'" && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then
UNDEFINED;
elsif HaveEL(EL3) && MDCR_EL3.TDOSA == '1' && (IsFeatureImplemented(FEAT_DoubleLock) || boolean IMPLEMENTATION_DEFINED "Trapped by MDCR_EL3.TDOSA") then
if Halted() && EDSCR.SDD == '1' then
UNDEFINED;
else
AArch64.SystemAccessTrap(EL3, 0x18);
else
OSDLR_EL1 = X[t];
elsif PSTATE.EL == EL3 then
OSDLR_EL1 = X[t];