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[Qemu-devel] [Bug 1723984] Re: ID_MMFR0 has an invalid value on aarch64
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Bug |
Subject: |
[Qemu-devel] [Bug 1723984] Re: ID_MMFR0 has an invalid value on aarch64 cpu (A57, A53) |
Date: |
Wed, 18 Oct 2017 07:05:04 -0000 |
I see your point. Thank you for the advice. I'm doing some low-level
check to be sure to be on a known platform, so this midr based code is
very localized. For the "core" of the kernel, I'm mostly using (1) as
access to MMU registers are localized in armv7/armv8 specialized sub-
directories.
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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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- [Qemu-devel] [Bug 1723984] [NEW] ID_MMFR0 has an invalid value on aarch64 cpu (A57, A53), Bug, 2017/10/16
- [Qemu-devel] [Bug 1723984] Re: ID_MMFR0 has an invalid value on aarch64 cpu (A57, A53), Peter Maydell, 2017/10/17
- [Qemu-devel] [Bug 1723984] Re: ID_MMFR0 has an invalid value on aarch64 cpu (A57, A53), Bug, 2017/10/17
- [Qemu-devel] [Bug 1723984] Re: ID_MMFR0 has an invalid value on aarch64 cpu (A57, A53), Peter Maydell, 2017/10/17
- [Qemu-devel] [Bug 1723984] Re: ID_MMFR0 has an invalid value on aarch64 cpu (A57, A53),
Bug <=