[Qemu-devel] [Bug 1723984] [NEW] ID_MMFR0 has an invalid value on aarch64 cpu (A57, A53)

[Bug]

Public bug reported:

The ID_MMFR0 register, accessed from aarch64 state as an invalid value:
- ARM ARM v8 documentation (D7.2 General system control registers) described 
bits AuxReg[23:20] to be
  "In ARMv8-A the only permitted value is 0010"
- Cortex A53 and Cortex A57 TRM describe the value to be 0x10201105, so 
AuxReg[23:20] is 0010 too
- in QEMU target/arm/cpu64.c, the relevant value is
  cpu->id_mmfr0 = 0x10101105;

The 1 should be changed to 2.

Spotted & Tested on the following qemu revision:

commit 48ae1f60d8c9a770e6da64407984d84e25253c69
Merge: 78b62d3 b867eaa
Author: Peter Maydell <address@hidden>
Date:   Mon Oct 16 14:28:13 2017 +0100

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1723984

Title:
  ID_MMFR0 has an invalid value on aarch64 cpu (A57, A53)

Status in QEMU:
  New

Bug description:
  The ID_MMFR0 register, accessed from aarch64 state as an invalid value:
  - ARM ARM v8 documentation (D7.2 General system control registers) described 
bits AuxReg[23:20] to be
    "In ARMv8-A the only permitted value is 0010"
  - Cortex A53 and Cortex A57 TRM describe the value to be 0x10201105, so 
AuxReg[23:20] is 0010 too
  - in QEMU target/arm/cpu64.c, the relevant value is
    cpu->id_mmfr0 = 0x10101105;

  The 1 should be changed to 2.

  Spotted & Tested on the following qemu revision:

  commit 48ae1f60d8c9a770e6da64407984d84e25253c69
  Merge: 78b62d3 b867eaa
  Author: Peter Maydell <address@hidden>
  Date:   Mon Oct 16 14:28:13 2017 +0100

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