s390x: wire up sclp console output

Now the basics should be working and therefore the self test should
pass.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20170522085702.17856-6-david@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

lib/s390x/io.c

@@ -12,6 +12,7 @@
  */
 #include <libcflat.h>
 #include <asm/spinlock.h>
+#include "sclp.h"
 
 extern void setup_args_progname(const char *args);
 extern char ipl_args[];
@@ -21,8 +22,7 @@ static struct spinlock lock;
 void puts(const char *s)
 {
 	spin_lock(&lock);
-	/* FIXME */
-	(void)s;
+	sclp_print(s);
 	spin_unlock(&lock);
 }
 
@@ -39,6 +39,7 @@ static void sigp_stop()
 void setup()
 {
 	setup_args_progname(ipl_args);
+	sclp_setup();
 }
 
 void exit(int code)

lib/s390x/sclp.h

@@ -102,4 +102,7 @@ typedef struct ReadEventData {
     uint32_t mask;
 } __attribute__((packed)) ReadEventData;
 
+void sclp_setup(void);
+void sclp_print(const char *str);
+
 #endif /* SCLP_H */