introduce cngrab/cnungrab stub calls in some places where they make sense

MFC after:	2 months

3 files changed, 10 insertions, 0 deletions

diff --git a/sys/kern/kern_cons.c b/sys/kern/kern_cons.c
index 75dc881..b5df465 100644
--- a/sys/kern/kern_cons.c
+++ b/sys/kern/kern_cons.c
@@ -427,8 +427,10 @@ cnputc(int c)
 	if (console_pausing && c == '\n' && !kdb_active) {
 		for (cp = console_pausestr; *cp != '\0'; cp++)
 			cnputc(*cp);
+		cngrab();
 		if (cngetc() == '.')
 			console_pausing = 0;
+		cnungrab();
 		cnputc('\r');
 		for (cp = console_pausestr; *cp != '\0'; cp++)
 			cnputc(' ');
diff --git a/sys/kern/kern_shutdown.c b/sys/kern/kern_shutdown.c
index 1a7b744..2999826 100644
--- a/sys/kern/kern_shutdown.c
+++ b/sys/kern/kern_shutdown.c
@@ -443,6 +443,8 @@ kern_reboot(int howto)
 
 	print_uptime();
 
+	cngrab();
+
 	/*
 	 * Ok, now do things that assume all filesystem activity has
 	 * been completed.
@@ -613,6 +615,7 @@ panic(const char *fmt, ...)
 	if (newpanic) {
 		(void)vsnprintf(buf, sizeof(buf), fmt, ap);
 		panicstr = buf;
+		cngrab();
 		printf("panic: %s\n", buf);
 	} else {
 		printf("panic: ");
diff --git a/sys/kern/subr_kdb.c b/sys/kern/subr_kdb.c
index 3c9d29b..9ca34b1 100644
--- a/sys/kern/subr_kdb.c
+++ b/sys/kern/subr_kdb.c
@@ -32,6 +32,7 @@ __FBSDID("$FreeBSD$");
 
 #include <sys/param.h>
 #include <sys/systm.h>
+#include <sys/cons.h>
 #include <sys/kdb.h>
 #include <sys/kernel.h>
 #include <sys/malloc.h>
@@ -622,6 +623,8 @@ kdb_trap(int type, int code, struct trapframe *tf)
 	makectx(tf, &kdb_pcb);
 	kdb_thr_select(curthread);
 
+	cngrab();
+
 	for (;;) {
 		handled = be->dbbe_trap(type, code);
 		if (be == kdb_dbbe)
@@ -632,6 +635,8 @@ kdb_trap(int type, int code, struct trapframe *tf)
 		printf("Switching to %s back-end\n", be->dbbe_name);
 	}
 
+	cnungrab();
+
 	kdb_active--;
 
 #ifdef SMP