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If the physical address of the GIC resource cannot be read from device tree, then the code falls back to reading it from the gcr_gic_base register. Hopefully this has been set to a sane value by the bootloader or some platform code, but is defined by the hardware manual to have "undefined" reset state. Using it as the address at which the GIC will be mapped into physical memory space can therefore be risky if it has not been initialised, since it may result in the GIC being mapped to an effectively random address anywhere in physical memory, where it might conflict with peripherals or RAM and lead to weird crashes. Since a "sane value" is very platform specific because it is particular to the platform's memory map, it is difficult to test for. At the very least, a warning message should be printed in the case that we trust the inherited value. Reported-by: Amit Kama <amit.kama@satixfy.com> Signed-off-by: Matt Redfearn <matt.redfearn@mips.com> Reviewed-by: Paul Burton <paul.burton@mips.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.