1 files changed, 47 insertions, 0 deletions
diff --git a/arch/sparc64/prom/printf.c b/arch/sparc64/prom/printf.c
new file mode 100644
index 00000000000..a6df82cafa0
--- /dev/null
+++ b/arch/sparc64/prom/printf.c
@@ -0,0 +1,47 @@
+/*
+ * printf.c:  Internal prom library printf facility.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ * Copyright (c) 2002 Pete Zaitcev (zaitcev@yahoo.com)
+ *
+ * We used to warn all over the code: DO NOT USE prom_printf(),
+ * and yet people do. Anton's banking code was outputting banks
+ * with prom_printf for most of the 2.4 lifetime. Since an effective
+ * stick is not available, we deployed a carrot: an early printk
+ * through PROM by means of -p boot option. This ought to fix it.
+ * USE printk; if you need, deploy -p.
+ */
+
+#include <linux/kernel.h>
+
+#include <asm/openprom.h>
+#include <asm/oplib.h>
+
+static char ppbuf[1024];
+
+void
+prom_write(const char *buf, unsigned int n)
+{
+	char ch;
+
+	while (n != 0) {
+		--n;
+		if ((ch = *buf++) == '\n')
+			prom_putchar('\r');
+		prom_putchar(ch);
+	}
+}
+
+void
+prom_printf(char *fmt, ...)
+{
+	va_list args;
+	int i;
+
+	va_start(args, fmt);
+	i = vscnprintf(ppbuf, sizeof(ppbuf), fmt, args);
+	va_end(args);
+
+	prom_write(ppbuf, i);
+}