TLBI ALLE1, TLBI ALLE1NXS

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TLBI ALLE1, TLBI ALLE1NXS, TLB Invalidate All, EL1

Purpose

Invalidates cached copies of translation table entries from TLBs that meet all the following requirements:

If FEAT_XS is implemented, the nXS variant of this System instruction is defined.

It is IMPLEMENTATION SPECIFIC whether the TLBI System instruction with the nXS qualifier invalidates TLB entries with the XS attribute set to 1.

The TLBI System instruction without the nXS qualifier waits for all memory accesses using in-scope old translation information to complete before it is considered complete.

The TLBI System instruction with the nXS qualifier is considered complete when the subset of these memory accesses with XS attribute set to 0 are complete.

Configuration

This instruction is present only when FEAT_AA64 is implemented. Otherwise, direct accesses to TLBI ALLE1, TLBI ALLE1NXS are UNDEFINED.

Attributes

Field descriptions

Executing TLBI ALLE1, TLBI ALLE1NXS

The Rt field should be set to 0b11111. If the Rt field is not set to 0b11111, it is CONSTRAINED UNPREDICTABLE whether:

The instruction is UNDEFINED.
The instruction behaves as if the Rt field is set to 0b11111.

This system instruction is an alias of the SYS instruction.

The following pseudocode describes traps which apply to the System instruction. For information about changes to the scope of the invalidation to the instruction under different conditions, see AArch64_TLBI_ALL() in the Pseudocode for AArch64 operation.

Accesses to this instruction use the following encodings in the System instruction encoding space:

TLBI ALLE1{, <Xt>}

op0	op1	CRn	CRm	op2
0b01	0b100	0b1000	0b0111	0b100

if !IsFeatureImplemented(FEAT_AA64) 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(); end; elsif PSTATE.EL == EL2 then AArch64_TLBI_ALL(SecurityStateAtEL(EL1), Regime_EL10, Broadcast_NSH, TLBI_AllAttr, X{64}(t)); elsif PSTATE.EL == EL3 then if IsFeatureImplemented(FEAT_RME) && !ValidSecurityStateAtEL(EL1) then return; else AArch64_TLBI_ALL(SecurityStateAtEL(EL1), Regime_EL10, Broadcast_NSH, TLBI_AllAttr, X{64}(t)); end; end;

When FEAT_XS is implemented

TLBI ALLE1NXS{, <Xt>}

op0	op1	CRn	CRm	op2
0b01	0b100	0b1001	0b0111	0b100

if !IsFeatureImplemented(FEAT_AA64) then Undefined(); elsif !IsFeatureImplemented(FEAT_XS) 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(); end; elsif PSTATE.EL == EL2 then AArch64_TLBI_ALL(SecurityStateAtEL(EL1), Regime_EL10, Broadcast_NSH, TLBI_ExcludeXS, X{64}(t)); elsif PSTATE.EL == EL3 then if IsFeatureImplemented(FEAT_RME) && !ValidSecurityStateAtEL(EL1) then return; else AArch64_TLBI_ALL(SecurityStateAtEL(EL1), Regime_EL10, Broadcast_NSH, TLBI_ExcludeXS, X{64}(t)); end; end;