20081119-0151

2 files changed, 12 insertions, 1 deletions

diff --git a/os/pc/fns.h b/os/pc/fns.h
index d4b61034..de8cfbe1 100644
--- a/os/pc/fns.h
+++ b/os/pc/fns.h
@@ -48,7 +48,7 @@ int	i8259enable(Vctl*);
 int	i8259vecno(int);
 int	i8259disable(int);
 void	idle(void);
-#define	idlehands()			/* nothing to do in the runproc */
+void	idlehands(void);
 int	inb(int);
 void	insb(int, void*, int);
 ushort	ins(int);
diff --git a/os/pc/main.c b/os/pc/main.c
index df4f240e..11e8d4db 100644
--- a/os/pc/main.c
+++ b/os/pc/main.c
@@ -455,3 +455,14 @@ isaconfig(char *class, int ctlrno, ISAConf *isa)
 	}
 	return 1;
 }
+
+/*
+ *  put the processor in the halt state if we've no processes to run.
+ *  an interrupt will get us going again.
+ */
+void
+idlehands(void)
+{
+	if(conf.nmach == 1)
+		halt();
+}