import xen 32 bit paravirtual kernel from /n/sources/xen.

1 files changed, 96 insertions, 0 deletions

diff --git a/sys/src/9/xen/devrtc.c b/sys/src/9/xen/devrtc.c
new file mode 100644
index 000000000..52db3ca22
--- /dev/null
+++ b/sys/src/9/xen/devrtc.c
@@ -0,0 +1,96 @@
+/*
+ * 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,
+};
+