mambo: add mprintf()

mprintf() is printf(), but it goes straight to the mambo console. This
allows it to be independent of Skiboot's actual console infrastructure
so it can be used for debugging the console drivers and for debugging
code that runs before the console is setup.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

2 files changed, 21 insertions, 0 deletions

diff --git a/include/console.h b/include/console.h
index b726251..708b696 100644
--- a/include/console.h
+++ b/include/console.h
@@ -100,4 +100,6 @@ extern struct opal_con_ops uart_opal_con;
 extern struct opal_con_ops fsp_opal_con;
 extern struct opal_con_ops dummy_opal_con;
 
+void mprintf(const char *fmt, ...);
+
 #endif /* __CONSOLE_H */
diff --git a/platforms/mambo/console.c b/platforms/mambo/console.c
index c7d7ab0..d02cde9 100644
--- a/platforms/mambo/console.c
+++ b/platforms/mambo/console.c
@@ -66,3 +66,22 @@ void enable_mambo_console(void)
 	prlog(PR_NOTICE, "Enabling Mambo console\n");
 	set_console(&mambo_con_driver);
 }
+
+/*
+ * mambo console based printf(), this is useful for debugging the console
+ * since mambo_console_write() can be safely called from anywhere.
+ *
+ * This is a debug hack and you shouldn't use it in real code.
+ */
+void mprintf(const char *fmt, ...)
+{
+	char buf[320];
+	va_list args;
+	int i;
+
+	va_start(args, fmt);
+	i = vsnprintf(buf, sizeof(buf), fmt, args);
+	va_end(args);
+
+	mambo_console_write(buf, i);
+}