97 lines
1.3 KiB
C
97 lines
1.3 KiB
C
/*
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* Xen wall clock
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*/
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#include "u.h"
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#include "../port/lib.h"
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#include "mem.h"
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#include "dat.h"
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#include "fns.h"
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#include "../port/error.h"
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enum{
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Qdir = 0,
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Qrtc,
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};
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Dirtab rtcdir[]={
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".", {Qdir, 0, QTDIR}, 0, 0555,
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"rtc", {Qrtc, 0}, 0, 0664,
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};
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static long
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rtcread(Chan *c, void *a, long n, vlong offset)
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{
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if(c->qid.type & QTDIR)
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return devdirread(c, a, n, rtcdir, nelem(rtcdir), devgen);
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switch((ulong)c->qid.path){
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case Qrtc:
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return readnum((ulong)offset, a, n, xenwallclock(), 12);
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}
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error(Ebadarg);
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return 0;
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}
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static long
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rtcwrite(Chan*c, void*, long n, vlong)
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{
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switch((ulong)c->qid.path){
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case Qrtc:
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return n;
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}
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error(Eperm);
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return 0;
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}
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static Chan*
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rtcattach(char* spec)
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{
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return devattach('r', spec);
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}
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static Walkqid*
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rtcwalk(Chan* c, Chan *nc, char** name, int nname)
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{
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return devwalk(c, nc, name, nname, rtcdir, nelem(rtcdir), devgen);
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}
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static int
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rtcstat(Chan* c, uchar* dp, int n)
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{
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return devstat(c, dp, n, rtcdir, nelem(rtcdir), devgen);
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}
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static Chan*
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rtcopen(Chan* c, int omode)
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{
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return devopen(c, omode, rtcdir, nelem(rtcdir), devgen);
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}
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static void
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rtcclose(Chan*)
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{
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}
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Dev rtcdevtab = {
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'r',
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"rtc",
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devreset,
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devinit,
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devshutdown,
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rtcattach,
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rtcwalk,
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rtcstat,
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rtcopen,
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devcreate,
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rtcclose,
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rtcread,
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devbread,
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rtcwrite,
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devbwrite,
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devremove,
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devwstat,
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};
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