1 files changed, 45 insertions, 0 deletions
diff --git a/arch/x86/boot/tty.c b/arch/x86/boot/tty.c
new file mode 100644
index 0000000000..a81671be3b
--- /dev/null
+++ b/arch/x86/boot/tty.c
@@ -0,0 +1,45 @@
+/* -*- linux-c -*- ------------------------------------------------------- *
+ *
+ *   Copyright (C) 1991, 1992 Linus Torvalds
+ *   Copyright 2007 rPath, Inc. - All Rights Reserved
+ *   Copyright 2009 Intel Corporation; author H. Peter Anvin
+ *
+ *   This file is part of the Linux kernel, and is made available under
+ *   the terms of the GNU General Public License version 2.
+ *
+ * ----------------------------------------------------------------------- */
+
+/**
+ * @file
+ * @brief Very simple screen I/O for the initialization stage
+ *
+ * @todo Probably should add very simple serial I/O?
+ * @attention This is real mode code!
+ */
+
+#include <asm/segment.h>
+#include "boot.h"
+
+/* be aware of: */
+THIS_IS_REALMODE_CODE
+
+static void __bootcode putchar(int ch)
+{
+	struct biosregs ireg;
+
+	if (ch == '\n')
+		putchar('\r');	/* \n -> \r\n */
+
+	initregs(&ireg);
+	ireg.bx = 0x0007;
+	ireg.cx = 0x0001;
+	ireg.ah = 0x0e;
+	ireg.al = ch;
+	intcall(0x10, &ireg, NULL);
+}
+
+void __bootcode boot_puts(char *str)
+{
+	while (*str)
+		putchar(*str++);
+}