GMID_EL1, Multiple tag transfer ID register

The GMID_EL1 characteristics are:

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

GMID_EL1 is a 64-bit register.

Field descriptions

6362616059585756555453525150494847464544434241403938373635343332
313029282726252423222120191817161514131211109876543210
RES0
RES0BS

Bits [63:4]

Reserved, RES0.

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).

Accessing GMID_EL1

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

MRS <Xt>, GMID_EL1

CRnop0op1op2CRm
0b00000b110b0010b1000b0000

if 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); else UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && HCR_EL2.TID5 == '1' then AArch64.SystemAccessTrap(EL2, 0x18); else return GMID_EL1; elsif PSTATE.EL == EL2 then return GMID_EL1; elsif PSTATE.EL == EL3 then return GMID_EL1;


30/06/2021 09:39; 4f5dd962f4e34e1ac282f76da4d6e7fc4cab087e

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