TLBTR

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TLBTR, TLB Type Register

Purpose

Provides information about the TLB implementation. The register must define whether the implementation provides separate instruction and data TLBs, or a unified TLB. Normally, the IMPLEMENTATION DEFINED information in this register includes the number of lockable entries in the TLB.

Configuration

This register is present only when FEAT_AA32EL1 is implemented. Otherwise, direct accesses to TLBTR are UNDEFINED.

Attributes

Field descriptions

IMPLEMENTATION DEFINED, bits [31:1]

nU, bit [0]

Not Unified TLB. Indicates whether the implementation has a unified TLB.

The value of this field is an IMPLEMENTATION DEFINED choice of:

nU	Meaning
0b0	Unified TLB.
0b1	Separate Instruction and Data TLBs.

Access to this field is RO.

Accessing TLBTR

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

MRC{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}

coproc	opc1	CRn	CRm	opc2
0b1111	0b000	0b0000	0b0000	0b011

if !IsFeatureImplemented(FEAT_AA32EL1) then Undefined(); elsif PSTATE.EL == EL0 then Undefined(); elsif PSTATE.EL == EL1 then if EL2Enabled() && IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2) && HSTR_EL2().T0 == '1' then AArch64_AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA32EL2) && ELUsingAArch32(EL2) && HSTR().T0 == '1' then AArch32_TakeHypTrapException(0x03); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA64EL2) && !ELUsingAArch32(EL2) && HCR_EL2().TID1 == '1' then AArch64_AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && IsFeatureImplemented(FEAT_AA32EL2) && ELUsingAArch32(EL2) && HCR().TID1 == '1' then AArch32_TakeHypTrapException(0x03); else R(t) = TLBTR(); end; elsif PSTATE.EL == EL2 then R(t) = TLBTR(); elsif PSTATE.EL == EL3 then R(t) = TLBTR(); end;

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																															nU