#include	"u.h"#include	"lib.h"#include	"mem.h"#include	"dat.h"#include	"fns.h"#include	"io.h" enum{	/* ctl[0] bits */	Parity=		1<<0,	Even=		1<<1,	Stop2=		1<<2,	Bits8=		1<<3,	SCE=		1<<4,	/* synchronous clock enable */	RCE=		1<<5,	/* rx on falling edge of clock */	TCE=		1<<6,	/* tx on falling edge of clock */ 	/* ctl[3] bits */	Rena=		1<<0,	/* receiver enable */	Tena=		1<<1,	/* transmitter enable */	Break=		1<<2,	/* force TXD3 low */	Rintena=	1<<3,	/* enable receive interrupt */	Tintena=	1<<4,	/* enable transmitter interrupt */	Loopback=	1<<5,	/* loop back data */ 	/* data bits */	DEparity=	1<<8,	/* parity error */	DEframe=	1<<9,	/* framing error */	DEoverrun=	1<<10,	/* overrun error */ 	/* status[0] bits */	Tint=		1<<0,	/* transmit fifo half full interrupt */	Rint0=		1<<1,	/* receiver fifo 1/3-2/3 full */	Rint1=		1<<2,	/* receiver fifo not empty and receiver idle */	Breakstart=	1<<3,	Breakend=	1<<4,	Fifoerror=	1<<5,	/* fifo error */ 	/* status[1] bits */	Tbusy=		1<<0,	/* transmitting */	Rnotempty=	1<<1,	/* receive fifo not empty */	Tnotfull=	1<<2,	/* transmit fifo not full */	ParityError=	1<<3,	FrameError=	1<<4,	Overrun=	1<<5,}; Uartregs *uart3regs = UART3REGS;  /* *  for iprint, just write it */voidserialputs(char *str, int n){	Uartregs *ur; 	ur = uart3regs;	while(n-- > 0){		/* wait for output ready */		while((ur->status[1] & Tnotfull) == 0)			;		ur->data = *str++;	}	while((ur->status[1] & Tbusy))		;}