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ACPICA commit dfa3feffa8f760b686207d09dc880cd2f26c72af Currently the pointer to the table is cast to acpi_physical_address and later cast back to a pointer to be dereferenced. Whether or not this is supported is implementation-defined. On CHERI, and thus Arm's experimental Morello prototype architecture, pointers are represented as capabilities, which are unforgeable bounded pointers, providing always-on fine-grained spatial memory safety. This means that any pointer cast to a plain integer will lose all its associated metadata, and when cast back to a pointer it will give a null-derived pointer (one that has the same metadata as null but an address equal to the integer) that will trap on any dereference. As a result, this is an implementation where acpi_physical_address cannot be used as a hack to store real pointers. Thus, alter the lifecycle of table descriptors. Internal physical tables keep the current behaviour where only the address is set on install, and the pointer is set on acquire. Virtual tables (internal and external) now store the pointer on initialisation and use that on acquire (which will redundantly set *table_ptr to itself, but changing that is both unnecessary and overly complicated as acpi_tb_acquire_table is called with both a pointer to a variable and a pointer to Table->Pointer itself). This requires propagating the (possible) table pointer everywhere in order to make sure pointers make it through to acpi_tb_acquire_temp_table, which requires a change to the acpi_install_table interface. Instead of taking an ACPI_PHYSADDR_TYPE and a boolean indicating whether it's physical or virtual, it is now split into acpi_install_table (that takes an external virtual table pointer) and acpi_install_physical_table (that takes an ACPI_PHYSADDR_TYPE for an internal physical table address). This also has the benefit of providing a cleaner API. Link: https://github.com/acpica/acpica/commit/dfa3feff Signed-off-by: Bob Moore <robert.moore@intel.com> [ rjw: Adjust the code in tables.c to match interface changes ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
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| README | ||
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.