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ARM Cortex-A72 MPCore Processor Technical Reference Manual : Primary Region Remap Register

Primary Region Remap Register

The PRRR characteristics are:

Purpose
Controls the top-level mapping of the TEX[0], C, and B memory region attributes.
Usage constraints

The accessibility to the PRRR by Exception level is:

EL0 EL1(NS) EL1(S) EL2 EL3(SCR.NS = 1) EL3(SCR.NS = 0)
- RW RW RW RW RW

Write access to the Secure copy of PRRR is disabled when the CP15SDISABLE signal is HIGH.

Configurations

The PRRR is:

  • Banked for the Secure and Non-secure states.
  • Only relevant if the TTBCR.EAE bit is 0.
  • Architecturally mapped to the MAIR0 register in AArch32 state.

The Non-secure PRRR is architecturally mapped to the AArch64 MAIR_EL1[31:0] register.

The Secure PRRR is mapped to the AArch64 MAIR_EL3[31:0] register.

Attributes
See the register summary in Table 4-94 c10 register summary.

See the ARM® Architecture Reference Manual ARMv8 for more information.

To access the PRRR in AArch32 state when TTBCR.EAE is 0, read or write the CP15 register with:

MRC p15, 0, <Rt>, c10, c2, 0; Read Primary Region Remap Register
MCR p15, 0, <Rt>, c10, c2, 0; Write Primary Region Remap Register