Changes: - added config for NEW_CTX_SWITCH - used new context on c906 sched switch routine - update _rt_hw_stack_init to fit into NEW_CTX_SWITCH - separated vector ctx from the generic Signed-off-by: Shell <smokewood@qq.com>
fix bugs on cache maintenance when starting user app
synchronize virtual memory system works. adding kernel virtual memory management layer for page-based MMU enabled architecture porting libcpu MMU codes porting lwp memory related codes