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Damien George authored
This adds the standard window-flush ISR to Edisoft RTEMS 4.8 builds, allowing the custom SPARC setjmp/longjmp implementation to use "ta 3" to instigate a window flush. For non-Edisoft builds "ta 3" can be used without any special additions because it already exists. For Edisoft builds the function sparc_install_ta_3_window_flush_isr() must be called before any MicroPython functions are called, in order to install the custom handler. With this patch the implementation of sparc_window_flush_trap_handler matches the standard implementation.
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