fbc81ec5b8
Commitdb227c19e6("ARM: 8985/1: efi/decompressor: deal with HYP mode boot gracefully") updated the EFI entry code to permit firmware to invoke the EFI stub loader in HYP mode, with the MMU either enabled or disabled, neither of which is permitted by the EFI spec, but which does happen in the field. In the MMU on case, we remain in HYP mode as configured by the firmware, and rely on the fact that any HVC instruction issued in this mode will be dispatched via the SVC slot in the HYP vector table. However, this slot will point to a Thumb2 symbol if the kernel is built in Thumb2 mode, and so we have to configure HSCTLR to ensure that the exception handlers are invoked in Thumb2 mode as well. Fixes:db227c19e6("ARM: 8985/1: efi/decompressor: deal with HYP mode boot gracefully") Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
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.