Expand description
Top Byte ignored - indicates whether the top byte of an address is used for address match for the TTBR0_EL2 region, or ignored and used for tagged addresses. Defined values are:
0 Top Byte used in the address calculation.
1 Top Byte ignored in the address calculation.
This affects addresses generated in EL2 using AArch64 where the address would be translated by tables pointed to by TTBR0_EL2. It has an effect whether the EL2, or EL2&0, translation regime is enabled or not.
If ARMv8.3-PAuth is implemented and TCR_EL2.TBID1 is 1, then this field only applies to Data accesses.
If the value of TBI is 1, then bits[63:56] of that target address are also set to 0 before the address is stored in the PC, in the following cases:
• A branch or procedure return within EL2. • An exception taken to EL2. • An exception return to EL2.
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Top Byte ignored - indicates whether the top byte of an address is used for address match for the TTBR0_EL2 region, or ignored and used for tagged addresses. Defined values are: