1 files changed, 31 insertions, 0 deletions
diff --git a/arch/h8300/kernel/sim-console.c b/arch/h8300/kernel/sim-console.c
new file mode 100644
index 000000000..03aa35b1a
--- /dev/null
+++ b/arch/h8300/kernel/sim-console.c
@@ -0,0 +1,31 @@
+/*
+ * arch/h8300/kernel/sim-console.c
+ *
+ *  Copyright (C) 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/serial_core.h>
+
+static void sim_write(struct console *con, const char *s, unsigned n)
+{
+	register const char *_ptr __asm__("er1") = s;
+	register const unsigned _len __asm__("er2") = n;
+
+	__asm__("sub.l er0,er0\n\t"		/* er0 = 1 (stdout) */
+		"inc.l #1,er0\n\t"
+		".byte 0x5e,0x00,0x00,0xc7\n\t" /* jsr @0xc7 (sys_write) */
+		: : "g"(_ptr), "g"(_len):"er0");
+}
+
+static int __init sim_setup(struct earlycon_device *device, const char *opt)
+{
+	device->con->write = sim_write;
+	return 0;
+}
+
+EARLYCON_DECLARE(h8sim, sim_setup);