Implement the ALT_BREAK_TO_DEBUGGER option for the ofw console. This is very

handy if the machine is on another floor. A minor issue with this is that
these functions are also used by the debugger, so its possible to break into
the debugger from the debugger.

PR:		sparc64/47143
Reviewed by:	benno
Approved by:	jake (mentor)

1 files changed, 18 insertions, 0 deletions

diff --git a/sys/dev/ofw/ofw_console.c b/sys/dev/ofw/ofw_console.c
index 27f8766..149739f 100644
--- a/sys/dev/ofw/ofw_console.c
+++ b/sys/dev/ofw/ofw_console.c
@@ -28,6 +28,9 @@ static const char rcsid[] =
   "$FreeBSD$";
 #endif /* not lint */
 
+#include "opt_ddb.h"
+#include "opt_comconsole.h"
+
 #include <sys/param.h>
 #include <sys/kernel.h>
 #include <sys/systm.h>
@@ -39,6 +42,8 @@ static const char rcsid[] =
 
 #include <dev/ofw/openfirm.h>
 
+#include <ddb/ddb.h>
+
 #define	OFW_POLL_HZ	4
 
 static d_open_t		ofw_dev_open;
@@ -68,6 +73,10 @@ static int			polltime;
 static struct callout_handle	ofw_timeouthandle
     = CALLOUT_HANDLE_INITIALIZER(&ofw_timeouthandle);
 
+#if defined(DDB) && defined(ALT_BREAK_TO_DEBUGGER)
+static int			alt_break_state;
+#endif
+
 static void	ofw_tty_start(struct tty *);
 static int	ofw_tty_param(struct tty *, struct termios *);
 static void	ofw_tty_stop(struct tty *, int);
@@ -296,6 +305,11 @@ ofw_cons_getc(dev_t dev)
 		}
 	}
 
+#if defined(DDB) && defined(ALT_BREAK_TO_DEBUGGER)
+	if (db_alt_break(ch, &alt_break_state))
+		breakpoint();
+#endif
+
 	return (ch);
 }
 
@@ -305,6 +319,10 @@ ofw_cons_checkc(dev_t dev)
 	unsigned char ch;
 
 	if (OF_read(stdin, &ch, 1) > 0) {
+#if defined(DDB) && defined(ALT_BREAK_TO_DEBUGGER)
+		if (db_alt_break(ch, &alt_break_state))
+			breakpoint();
+#endif
 		return (ch);
 	}