#include	"u.h"#include	"../port/lib.h"#include	"mem.h"#include	"dat.h"#include	"fns.h"#include	"../port/error.h" #include	"io.h" enum{	Qdir,	Qrtc,}; static Dirtab rtctab[]={	".",		{Qdir,0,QTDIR},	0,	0555,	"rtc",		{Qrtc},	NUMSIZE,	0664,}; extern ulong boottime; static voidrtcreset(void){} static Chan*rtcattach(char *spec){	return devattach('r', spec);} static Walkqid*rtcwalk(Chan *c, Chan *nc, char **name, int nname){	return devwalk(c, nc, name, nname, rtctab, nelem(rtctab), devgen);} static intrtcstat(Chan *c, uchar *dp, int n){	return devstat(c, dp, n, rtctab, nelem(rtctab), devgen);} static Chan*rtcopen(Chan *c, int omode){	return devopen(c, omode, rtctab, nelem(rtctab), devgen);} static void	 rtcclose(Chan*){} static long	 rtcread(Chan *c, void *buf, long n, vlong off){	ulong secs, *ps = uncached(&secs); 	if(c->qid.type & QTDIR)		return devdirread(c, buf, n, rtctab, nelem(rtctab), devgen); 	switch((ulong)c->qid.path){	case Qrtc:		*ps = 1;		nbfifoput(F9TSystem|F9Sysrrtc, (ulong)ps);		while(*ps == 1); /* wait for arm7 write */		return readnum(off, buf, n, *ps, NUMSIZE);	}	error(Egreg);	return 0;		/* not reached */} static long	 rtcwrite(Chan *c, void *buf, long n, vlong off){	ulong offset = off;	ulong secs;	char *cp, sbuf[32]; 	switch((ulong)c->qid.path){	case Qrtc:		if(offset != 0 || n >= sizeof(sbuf)-1)			error(Ebadarg);		memmove(sbuf, buf, n);		sbuf[n] = '\0';		cp = sbuf;		while(*cp){			if(*cp>='0' && *cp<='9')				break;			cp++;		}		secs = strtoul(cp, 0, 0);		fifoput(F9TSystem|F9Syswrtc, (ulong)(&secs));		return n; 	}	error(Egreg);	return 0;		/* not reached */} Dev rtcdevtab = {	'r',	"rtc", 	rtcreset,	devinit,	devshutdown,	rtcattach,	rtcwalk,	rtcstat,	rtcopen,	devcreate,	rtcclose,	rtcread,	devbread,	rtcwrite,	devbwrite,	devremove,	devwstat,};