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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:

6362616059585756555453525150494847464544434241403938373635343332
RES0
RES0DLK
313029282726252423222120191817161514131211109876543210

Bits [63:1]

Reserved, RES0.

DLK, bit [0]

When FEAT_DoubleLock is implemented:

OS Double Lock control bit.

DLKMeaning
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:

Accessing the OSDLR_EL1

Accesses to this register use the following encodings:

MRS <Xt>, OSDLR_EL1

op0op1CRnCRmop2
0b100b0000b00010b00110b100

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>

op0op1CRnCRmop2
0b100b0000b00010b00110b100

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];

Reserved, RAZ/WI.

Accessing the OSDLR_EL1

Accesses to this register use the following encodings:

MRS <Xt>, OSDLR_EL1

op0op1CRnCRmop2
0b100b0000b00010b00110b100

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>

op0op1CRnCRmop2
0b100b0000b00010b00110b100

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];




3001/0907/2020 15:0757; ccead0cb9f089f9ceec50268e82aec9e7104721180324f0b9997bede489cc15ad1565345720bcd2a

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