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According to the RISC-V Privileged Architecture Specification (20211203), writing Initial or Clean to the FS field of mstatus may result in the FS value getting set to Dirty in some implementations. This means we cannot rely on reading back the same FS value after writing to mstatus. Previously, the context restore code would: 1. Write an FS value to mstatus 2. Read mstatus again at a later point 3. Use the read FS value to determine FPU status This change updates the context restore code to use the mstatus value from the saved context instead of re-reading mstatus after writing to it. This required chaning the location of the mstatus slot in the context. Fixes: https://github.com/FreeRTOS/FreeRTOS-Kernel/issues/1327 Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>
Each real time kernel port consists of three files that contain the core kernel components and are common to every port, and one or more files that are specific to a particular microcontroller and/or compiler. + The FreeRTOS/Source/Portable/MemMang directory contains the five sample memory allocators as described on the https://www.FreeRTOS.org WEB site. + The other directories each contain files specific to a particular microcontroller or compiler, where the directory name denotes the compiler specific files the directory contains. For example, if you are interested in the [compiler] port for the [architecture] microcontroller, then the port specific files are contained in FreeRTOS/Source/Portable/[compiler]/[architecture] directory. If this is the only port you are interested in then all the other directories can be ignored.