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

[Gedare Bloom (@gedare)]

Gedare Bloom started a new discussion on bsps/riscv/include/bsp/riscv-rnmi.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1391#note_158065

 > +#define RNMI_CTX_MNCAUSE  0
 > +#define RNMI_CTX_MNEPC    4
 > +#define RNMI_CTX_SIZE     8
 > +#endif
 > +
 > +/*
 > + * Offset of clint_msip pointer within Per_CPU_Control, for assembly.
 > + */
 > +#if defined(__riscv_atomic) && __riscv_xlen == 64
 > +#define RISCV_PER_CPU_CLINT_MSIP 40
 > +#elif defined(__riscv_atomic) && __riscv_xlen == 32
 > +#define RISCV_PER_CPU_CLINT_MSIP 28
 > +#elif __riscv_xlen == 64
 > +#define RISCV_PER_CPU_CLINT_MSIP 24
 > +#elif __riscv_xlen == 32
 > +#define RISCV_PER_CPU_CLINT_MSIP 12

these seem to belong to cpuimpl.h

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1391#note_158065
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