RTEMS | Draft: bsps/riscv: add Smrnmi extension support (!1391)

[Gedare Bloom (@gedare)]

Gedare Bloom started a new discussion on bsps/riscv/riscv/irq/rnmi.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1391#note_158070

 > +#include <rtems/score/cpu.h>
 > +#include <rtems/score/percpu.h>
 > +#include <rtems/score/riscv-utility.h>
 > +#include <rtems/score/smpimpl.h>
 > +
 > +/* Per-core deferred RNMI contexts */
 > +static RISCV_RNMI_Context _RISCV_RNMI_context[CPU_MAXIMUM_PROCESSORS];
 > +
 > +static void _RISCV_RNMI_deferred_enable_action(void *arg)
 > +{
 > +  (void)arg;
 > +  uint32_t cpu_index = _Per_CPU_Get_index(_Per_CPU_Get());
 > +  uintptr_t ctx_addr = (uintptr_t)&_RISCV_RNMI_context[cpu_index];
 > +
 > +  /* Enable deferred processing on this hart */
 > +  write_csr(0x740, ctx_addr);

add a macro for what is 0x740 if it's not already in the encoding.h header, add to riscv-utility.h probably.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1391#note_158070
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