b1d97688b7
Summary: This commit removes the riscv_mhartid function and replaces all its usages with up_cpu_index. The functionality is consolidated into up_cpu_index which provides a more consistent API for getting the current CPU/hart ID across different execution modes (machine/supervisor). Impact: - Removes riscv_mhartid.S and its references from build systems - Updates all arch-specific code to use up_cpu_index instead - Adds more detailed documentation for up_cpu_index behavior - Changes the implementation of up_cpu_index to use percpu scratch register in supervisor mode Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.
Getting Started
First time on NuttX? Read the Getting Started guide! If you don't have a board available, NuttX has its own simulator that you can run on terminal.
Documentation
You can find the current NuttX documentation on the Documentation Page.
Alternatively, you can build the documentation yourself by following the Documentation Build Instructions.
The old NuttX documentation is still available in the Apache wiki.
Supported Boards
NuttX supports a wide variety of platforms. See the full list on the Supported Platforms page.
Contributing
If you wish to contribute to the NuttX project, read the Contributing guidelines for information on Git usage, coding standard, workflow and the NuttX principles.
License
The code in this repository is under either the Apache 2 license, or a license compatible with the Apache 2 license. See the License Page for more information.