The ACTLRMASK_EL2 characteristics are:
Mask register to prevent updates of fields in ACTLR_EL2 on writes.
This register is present only when FEAT_SRMASK is implemented. Otherwise, direct accesses to ACTLRMASK_EL2 are UNDEFINED.
If EL2 is not implemented, this register is RES0 from EL3.
This register has no effect if EL2 is not enabled in the current Security state.
ACTLRMASK_EL2 is a 64-bit register.
| 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 |
| IMPLEMENTATION DEFINED | |||||||||||||||||||||||||||||||
| IMPLEMENTATION DEFINED | |||||||||||||||||||||||||||||||
IMPLEMENTATION DEFINED.
When the Effective value of HCR_EL2.E2H is 1, without explicit synchronization, accesses from EL2 using the accessor name ACTLRMASK_EL2 or ACTLRMASK_EL1 are not guaranteed to be ordered with respect to accesses using the other accessor name.
Accesses to this register use the following encodings in the System register encoding space:
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b11 | 0b100 | 0b0001 | 0b0100 | 0b001 |
if !IsFeatureImplemented(FEAT_SRMASK) then UNDEFINED; elsif PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EffectiveHCR_EL2_NVx() IN {'xx1'} then AArch64.SystemAccessTrap(EL2, 0x18); else UNDEFINED; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3.SRMASKEn == '0' then UNDEFINED; elsif HaveEL(EL3) && SCR_EL3.SRMASKEn == '0' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); else X[t, 64] = ACTLRMASK_EL2; elsif PSTATE.EL == EL3 then X[t, 64] = ACTLRMASK_EL2;
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b11 | 0b100 | 0b0001 | 0b0100 | 0b001 |
if !IsFeatureImplemented(FEAT_SRMASK) then UNDEFINED; elsif PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EffectiveHCR_EL2_NVx() IN {'xx1'} then AArch64.SystemAccessTrap(EL2, 0x18); else UNDEFINED; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3.SRMASKEn == '0' then UNDEFINED; elsif HaveEL(EL3) && SCR_EL3.SRMASKEn == '0' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif !IsZero(EffectiveACTLRMASK_EL2()) then UNDEFINED; else ACTLRMASK_EL2 = X[t, 64]; elsif PSTATE.EL == EL3 then ACTLRMASK_EL2 = X[t, 64];
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b11 | 0b000 | 0b0001 | 0b0100 | 0b001 |
if !IsFeatureImplemented(FEAT_SRMASK) then UNDEFINED; elsif PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3.SRMASKEn == '0' then UNDEFINED; elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT2) && ((HaveEL(EL3) && SCR_EL3.FGTEn2 == '0') || HFGRTR2_EL2.nACTLRMASK_EL1 == '0') then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && (!IsHCRXEL2Enabled() || HCRX_EL2.SRMASKEn == '0') then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && SCR_EL3.SRMASKEn == '0' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif EffectiveHCR_EL2_NVx() IN {'1x1'} && (!boolean IMPLEMENTATION_DEFINED "IMPLEMENTED_ACTLR_ELx accessor behavior" || EffectiveHCR_EL2_NVx() == '111') then X[t, 64] = NVMem[0x340]; else X[t, 64] = ACTLRMASK_EL1; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3.SRMASKEn == '0' then UNDEFINED; elsif HaveEL(EL3) && SCR_EL3.SRMASKEn == '0' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif boolean IMPLEMENTATION_DEFINED "IMPLEMENTED_ACTLR_ELx accessor behavior" && ELIsInHost(EL2) then X[t, 64] = ACTLRMASK_EL2; else X[t, 64] = ACTLRMASK_EL1; elsif PSTATE.EL == EL3 then X[t, 64] = ACTLRMASK_EL1;
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b11 | 0b000 | 0b0001 | 0b0100 | 0b001 |
if !IsFeatureImplemented(FEAT_SRMASK) then UNDEFINED; elsif PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3.SRMASKEn == '0' then UNDEFINED; elsif EL2Enabled() && IsFeatureImplemented(FEAT_FGT2) && ((HaveEL(EL3) && SCR_EL3.FGTEn2 == '0') || HFGWTR2_EL2.nACTLRMASK_EL1 == '0') then AArch64.SystemAccessTrap(EL2, 0x18); elsif EL2Enabled() && (!IsHCRXEL2Enabled() || HCRX_EL2.SRMASKEn == '0') then AArch64.SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && SCR_EL3.SRMASKEn == '0' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif EffectiveHCR_EL2_NVx() IN {'1x1'} && (!boolean IMPLEMENTATION_DEFINED "IMPLEMENTED_ACTLR_ELx accessor behavior" || EffectiveHCR_EL2_NVx() == '111') then X[t, 64] = NVMem[0x340]; elsif !IsZero(EffectiveACTLRMASK_EL1()) then UNDEFINED; else ACTLRMASK_EL1 = X[t, 64]; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && SCR_EL3.SRMASKEn == '0' then UNDEFINED; elsif HaveEL(EL3) && SCR_EL3.SRMASKEn == '0' then if EL3SDDUndef() then UNDEFINED; else AArch64.SystemAccessTrap(EL3, 0x18); elsif boolean IMPLEMENTATION_DEFINED "IMPLEMENTED_ACTLR_ELx accessor behavior" && ELIsInHost(EL2) then if !IsZero(EffectiveACTLRMASK_EL2()) then UNDEFINED; else ACTLRMASK_EL2 = X[t, 64]; else ACTLRMASK_EL1 = X[t, 64]; elsif PSTATE.EL == EL3 then ACTLRMASK_EL1 = X[t, 64];
15/12/2024 22:27; 5e0a212688c6bd7aee92394b6f5e491b4d0fee1d
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