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Add support for alternative break-to-debugger support on the Xen console.

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This should help debug boot-time hangs experienced in 9.0-BETA.

MFC after:	3 weeks
Tested by:	sbruno
Approved by:	re (kib)
This commit is contained in:
Robert Watson 2011-09-02 17:36:01 +00:00
parent d2e17ce906
commit e53e8455f0
1 changed files with 9 additions and 1 deletions
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10
sys/dev/xen/console/console.c
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@ -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 {