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The RISC-V Pointer Masking specification defines three extensions: Smmpm, Smnpm, and Ssnpm. Add support for parsing each of them. The specific extension which provides pointer masking support to userspace (Supm) depends on the kernel's privilege mode, so provide a macro to abstract this selection. Smmpm implies the existence of the mseccfg CSR. As it is the only user of this CSR so far, there is no need for an Xlinuxmseccfg extension. Reviewed-by: Charlie Jenkins <charlie@rivosinc.com> Signed-off-by: Samuel Holland <samuel.holland@sifive.com> Link: https://lore.kernel.org/r/20241016202814.4061541-3-samuel.holland@sifive.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.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.