From ed650a41c57d824f6503f266f21093d3ee18d21d Mon Sep 17 00:00:00 2001
From: Justus Winter <4winter@informatik.uni-hamburg.de>
Date: Thu, 21 Aug 2014 16:51:54 +0200
Subject: Support invoking the debugger over the serial console

* i386/i386at/com.c (comintr): Invoke the debugger if ctrl-alt-d is
pressed.
* i386/i386at/com.h (kdb_kintr): Add declaration.
---
 i386/i386at/com.c | 27 ++++++++++++++++++++++++++-
 i386/i386at/com.h |  4 ++++
 2 files changed, 30 insertions(+), 1 deletion(-)

(limited to 'i386')

diff --git a/i386/i386at/com.c b/i386/i386at/com.c
index 5e65ad8..619e1af 100644
--- a/i386/i386at/com.c
+++ b/i386/i386at/com.c
@@ -518,10 +518,35 @@ comintr(int unit)
 		case RECi:
 		case CTIi:         /* Character timeout indication */
 			if (tp->t_state&TS_ISOPEN) {
+				int escape = 0;
 				while ((line = inb(LINE_STAT(addr))) & iDR) {
 					c = inb(TXRX(addr));
-					ttyinput(c, tp);
+
+					if (c == 0x1b) {
+						escape = 1;
+						continue;
+					}
+
+#if MACH_KDB
+					if (escape && c == 'D'-'@')
+						/* ctrl-alt-d pressed,
+						   invoke debugger */
+						kdb_kintr();
+					else
+#endif /* MACH_KDB */
+					if (escape) {
+						ttyinput(0x1b, tp);
+						ttyinput(c, tp);
+					}
+					else
+						ttyinput(c, tp);
+
+					escape = 0;
 				}
+
+				if (escape)
+					/* just escape */
+					ttyinput(0x1b, tp);
 			} else
 				tt_open_wakeup(tp);
 			break;
diff --git a/i386/i386at/com.h b/i386/i386at/com.h
index 95baa45..779cdba 100644
--- a/i386/i386at/com.h
+++ b/i386/i386at/com.h
@@ -71,6 +71,10 @@ comsetstat(
 	int 		*data,
 	natural_t	count);
 
+#if MACH_KDB
+extern void kdb_kintr(void);
+#endif /* MACH_KDB */
+
 extern io_return_t comopen(dev_t dev, int flag, io_req_t ior);
 extern void comclose(dev_t dev, int flag);
 extern io_return_t comread(dev_t dev, io_req_t ior);
-- 
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