GMID_EL1

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GMID_EL1, Multiple tag transfer ID Register

Purpose

Indicates the block size that is accessed by the LDGM and STGM System instructions.

Configuration

This register is present only when FEAT_MTE2 is implemented. Otherwise, direct accesses to GMID_EL1 are UNDEFINED.

Attributes

Field descriptions

Bits [63:4]

BS, bits [3:0]

Log₂ of the block size in words. The minimum supported size is 16B (value == 2) and the maximum is 256B (value == 6).

This field has an IMPLEMENTATION DEFINED value.

Access to this field is RO.

Accessing GMID_EL1

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

MRS <Xt>, GMID_EL1

op0	op1	CRn	CRm	op2
0b11	0b001	0b0000	0b0000	0b100

if !IsFeatureImplemented(FEAT_MTE2) then UnimplementedIDRegister(); elsif PSTATE.EL == EL0 then if IsFeatureImplemented(FEAT_IDST) then if EL2Enabled() && HCR_EL2().TGE == '1' then AArch64_SystemAccessTrap(EL2, 0x18); else AArch64_SystemAccessTrap(EL1, 0x18); end; else Undefined(); end; elsif PSTATE.EL == EL1 then if HaveEL(EL3) && EL3SDDUndefPriority() && IsFeatureImplemented(FEAT_IDTE3) && SCR_EL3().TID5 == '1' then Undefined(); elsif EL2Enabled() && HCR_EL2().TID5 == '1' then AArch64_SystemAccessTrap(EL2, 0x18); elsif HaveEL(EL3) && IsFeatureImplemented(FEAT_IDTE3) && SCR_EL3().TID5 == '1' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else X{64}(t) = GMID_EL1(); end; elsif PSTATE.EL == EL2 then if HaveEL(EL3) && EL3SDDUndefPriority() && IsFeatureImplemented(FEAT_IDTE3) && SCR_EL3().TID5 == '1' then Undefined(); elsif HaveEL(EL3) && IsFeatureImplemented(FEAT_IDTE3) && SCR_EL3().TID5 == '1' then if EL3SDDUndef() then Undefined(); else AArch64_SystemAccessTrap(EL3, 0x18); end; else X{64}(t) = GMID_EL1(); end; elsif PSTATE.EL == EL3 then X{64}(t) = GMID_EL1(); end;

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RES0
RES0																												BS