1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
/*
* Xen wall clock
*/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "../port/error.h"
enum{
Qdir = 0,
Qrtc,
};
Dirtab rtcdir[]={
".", {Qdir, 0, QTDIR}, 0, 0555,
"rtc", {Qrtc, 0}, 0, 0664,
};
static long
rtcread(Chan *c, void *a, long n, vlong offset)
{
if(c->qid.type & QTDIR)
return devdirread(c, a, n, rtcdir, nelem(rtcdir), devgen);
switch((ulong)c->qid.path){
case Qrtc:
return readnum((ulong)offset, a, n, xenwallclock(), 12);
}
error(Ebadarg);
return 0;
}
static long
rtcwrite(Chan*c, void*, long n, vlong)
{
switch((ulong)c->qid.path){
case Qrtc:
return n;
}
error(Eperm);
return 0;
}
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)
{
return devopen(c, omode, rtcdir, nelem(rtcdir), devgen);
}
static void
rtcclose(Chan*)
{
}
Dev rtcdevtab = {
'r',
"rtc",
devreset,
devinit,
devshutdown,
rtcattach,
rtcwalk,
rtcstat,
rtcopen,
devcreate,
rtcclose,
rtcread,
devbread,
rtcwrite,
devbwrite,
devremove,
devwstat,
};
|
