SSTATUS_FS_SHIFT
#define SSTATUS_FS_MASK (0x3 << SSTATUS_FS_SHIFT)
#define SSTATUS_FS_OFF (0x0 << SSTATUS_FS_SHIFT)
#define SSTATUS_FS_INITIAL (0x1 << SSTATUS_FS_SHIFT)
#define SSTATUS_FS_CLEAN (0x2 << SSTATUS_FS_SHIFT)
#define SSTATUS_FS_DIRTY (0x3 << SSTATUS_FS_SHIFT)