On Mon, Jun 13, 2016 at 06:08:09PM +0100, Suzuki K Poulose wrote: > From: Steve Capper <[email protected]> > > It can be useful for JIT software to be aware of MIDR_EL1 and > REVIDR_EL1 to ascertain the presence of any core errata that could > affect codegen. > > This patch exposes these registers through sysfs: > > /sys/devices/system/cpu/cpu$ID/identification/midr > /sys/devices/system/cpu/cpu$ID/identification/revidr > > where $ID is the cpu number. For big.LITTLE systems, one can have a > mixture of cores (e.g. Cortex A53 and Cortex A57), thus all CPUs need > to be enumerated. > > If the kernel does not have valid information to populate these entries > with, an empty string is returned to userspace.
So there's no confusion, I've historically said no on 32-bit ARM to exposing the MIDR to userspace, and my position on that for 32-bit ARM has not changed. -- RMK's Patch system: http://www.armlinux.org.uk/developer/patches/ FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net.
