RTEMS | riscv: add helper functions (!1239)

[Gedare Bloom (@gedare)]

Gedare Bloom commented on a discussion on cpukit/score/cpu/riscv/include/rtems/score/riscv-utility.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1239#note_149902

 >  #define SATP_MODE_SHIFT (31)
 >  #endif
 >  
 > +#ifndef ASM
 > +
 > +#define _RISCV_FENCE( pred, succ )                              \
 > +  __asm__ volatile ( "fence " #pred ", " #succ : : : "memory" )
 > +
 > +static inline void _RISCV_data_barrier( void )
 > +{
 > +  _RISCV_FENCE( rw, rw );

This is a good point. The fences probably should have had it, to prevent the compiler from reordering loads and stores. I have no idea if gcc is smart enough to avoid doing that.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1239#note_149902
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