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eada38d575
Intel Advanced Performance Extensions (APX) uses a new 2-byte prefix named REX2 to select extended general purpose registers (EGPRs) i.e. r16 to r31. The REX2 prefix is effectively an extended version of the REX prefix. REX2 and EVEX are also used with PUSH/POP instructions to provide a Push-Pop Acceleration (PPX) hint. With PPX hints, a CPU will attempt to fast-forward register data between matching PUSH and POP instructions. REX2 is valid only with opcodes in maps 0 and 1. Similar extension for other maps is provided by the EVEX prefix, covered in a separate patch. Some opcodes in maps 0 and 1 are reserved under REX2. One of these is used for a new 64-bit absolute direct jump instruction JMPABS. Refer to the Intel Advanced Performance Extensions (Intel APX) Architecture Specification for details. Define a code value for the REX2 prefix (INAT_PFX_REX2), and add attribute flags for opcodes reserved under REX2 (INAT_NO_REX2) and to identify opcodes (only JMPABS) that require a mandatory REX2 prefix (INAT_REX2_VARIANT). Amend logic to read the REX2 prefix and get the opcode attribute for the map number (0 or 1) encoded in the REX2 prefix. Amend the awk script that generates the attribute tables from the opcode map, to recognise "REX2" as attribute INAT_PFX_REX2, and "(!REX2)" as attribute INAT_NO_REX2, and "(REX2)" as attribute INAT_REX2_VARIANT. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20240502105853.5338-6-adrian.hunter@intel.com |
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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 reStructuredText 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.