S_SYS_PART
#define M_SYS_PART _SB_MAKEMASK(16, S_SYS_PART)
#define V_SYS_PART(x) _SB_MAKEVALUE(x, S_SYS_PART)
#define G_SYS_PART(x) _SB_GETVALUE(x, S_SYS_PART, M_SYS_PART)