21f8479617
Armv8.4-A extension enables MRS instruction encodings inside ESR_ELx.ISS during exception class ESR_ELx_EC_SYS64 (0x18). This encoding can be used to emulate MRS instructions which can avoid fetch/decode from user space thus improving performance. This adds a new sys64_hook structure element with applicable ESR mask/value pair for MRS instructions on various system registers but constrained by sysreg encodings which is currently allowed to be emulated. Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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.
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.