/* *  PL031 RTC driver */ #include	"u.h"#include	"../port/lib.h"#include	"mem.h"#include	"dat.h"#include	"fns.h"#include	"../port/error.h" enum{	Qdir = 0,	Qrtc,}; static u32int *regs = (u32int *)(VIRTIO + 0x01010000); Dirtab rtcdir[]={	".",	{Qdir, 0, QTDIR},	0,	0555,	"rtc",	{Qrtc, 0},		0,	0664,}; 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, rtcdir, nelem(rtcdir), devgen);} static int	 rtcstat(Chan* c, uchar* dp, int n){	return devstat(c, dp, n, rtcdir, nelem(rtcdir), devgen);} static Chan*rtcopen(Chan* c, int omode){	omode = openmode(omode);	switch((ulong)c->qid.path){	case Qrtc:		if(strcmp(up->user, eve)!=0 && omode!=OREAD)			error(Eperm);		break;	}	return devopen(c, omode, rtcdir, nelem(rtcdir), devgen);} static void	 rtcclose(Chan*){} long	 rtctime(void){	return *regs;} static long	 rtcread(Chan* c, void* buf, long n, vlong off){	ulong offset = off; 	if(c->qid.type & QTDIR)		return devdirread(c, buf, n, rtcdir, nelem(rtcdir), devgen); 	switch((ulong)c->qid.path){	case Qrtc:		return readnum(offset, buf, n, rtctime(), 12);	}	error(Ebadarg);} static long	 rtcwrite(Chan*, void*, long, vlong){	error(Eperm);} Dev rtcdevtab = {	'r',	"rtc", 	devreset,	devinit,	devshutdown,	rtcattach,	rtcwalk,	rtcstat,	rtcopen,	devcreate,	rtcclose,	rtcread,	devbread,	rtcwrite,	devbwrite,	devremove,	devwstat,};