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825f0aece0
Restructure how to represent and interpret REX fields, preparing for handling of both REX2 and VEX. REX uses the upper four bits of a single byte as a fixed identifier, and the lower four bits containing the data. VEX and REX2 extends this so that the first byte identifies the prefix and the rest encode additional bits; and while VEX only has the same four data bits as REX, eight zero bits are a valid value for the data bits of REX2. So, stop storing the REX byte as-is. Instead, store only the low bits of the REX prefix and track separately whether a REX-like prefix was used. No functional changes intended. Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Message-ID: <20251110180131.28264-11-chang.seok.bae@intel.com> [Extracted from APX series; removed bitfields and REX2-specific default. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Link: https://patch.msgid.link/20251114003633.60689-9-pbonzini@redhat.com [sean: name REX_{BXRW} enum "rex_bits"] Signed-off-by: Sean Christopherson <seanjc@google.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 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.