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RTEMS_INLINE_ROUTINE boolean _ISR_Is_in_progress( void )
{
        register unsigned int isr_nesting_level;
        /*
         * Move from special purpose register 0 (mfspr SPRG0, r3)
         */
        asm volatile ("mfspr    %0, 272" : "=r" (isr_nesting_level));
        return isr_nesting_level;
}