Author: rwatson
Date: Fri Sep 2 17:36:01 2011
New Revision: 225343
URL: http://svn.freebsd.org/changeset/base/225343
Log:
Add support for alternative break-to-debugger support on the Xen console.
This should help debug boot-time hangs experienced in 9.0-BETA.
MFC after: 3 weeks
Tested by: sbruno
Approved by: re (kib)
Modified:
head/sys/dev/xen/console/console.c
Modified: head/sys/dev/xen/console/console.c
==============================================================================
--- head/sys/dev/xen/console/console.c Fri Sep 2 17:30:50 2011
(r225342)
+++ head/sys/dev/xen/console/console.c Fri Sep 2 17:36:01 2011
(r225343)
@@ -70,6 +70,10 @@ static int rc, rp;
static unsigned int cnsl_evt_reg;
static unsigned int wc, wp; /* write_cons, write_prod */
+#ifdef KDB
+static int xc_altbrk;
+#endif
+
#define CDEV_MAJOR 12
#define XCUNIT(x) (dev2unit(x))
#define ISTTYOPEN(tp) ((tp) && ((tp)->t_state & TS_ISOPEN))
@@ -268,8 +272,12 @@ xencons_rx(char *buf, unsigned len)
#endif
) {
tty_lock(tp);
- for (i = 0; i < len; i++)
+ for (i = 0; i < len; i++) {
+#ifdef KDB
+ kdb_alt_break(buf[i], &xc_altbrk);
+#endif
ttydisc_rint(tp, buf[i], 0);
+ }
ttydisc_rint_done(tp);
tty_unlock(tp);
} else {
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