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-rw-r--r--src/drivers/emulation/qemu/Makefile.inc3
-rw-r--r--src/drivers/emulation/qemu/qemu_debugcon.c41
2 files changed, 44 insertions, 0 deletions
diff --git a/src/drivers/emulation/qemu/Makefile.inc b/src/drivers/emulation/qemu/Makefile.inc
index e7dc5edc3b..33516272dd 100644
--- a/src/drivers/emulation/qemu/Makefile.inc
+++ b/src/drivers/emulation/qemu/Makefile.inc
@@ -1,3 +1,6 @@
+romstage-$(CONFIG_CONSOLE_QEMU_DEBUGCON) += qemu_debugcon.c
+ramstage-$(CONFIG_CONSOLE_QEMU_DEBUGCON) += qemu_debugcon.c
+
ramstage-$(CONFIG_DRIVERS_EMULATION_QEMU_BOCHS) += bochs.c
ramstage-$(CONFIG_DRIVERS_EMULATION_QEMU_BOCHS) += cirrus.c
ramstage-$(CONFIG_DRIVERS_EMULATION_QEMU_BOCHS) += ../../pc80/vga/vga_io.c
diff --git a/src/drivers/emulation/qemu/qemu_debugcon.c b/src/drivers/emulation/qemu/qemu_debugcon.c
new file mode 100644
index 0000000000..9c005851ea
--- /dev/null
+++ b/src/drivers/emulation/qemu/qemu_debugcon.c
@@ -0,0 +1,41 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Red Hat Inc.
+ * Written by Gerd Hoffmann <kraxel@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <console/console.h>
+#include <console/qemu_debugcon.h>
+#include <arch/io.h>
+#include <arch/early_variables.h>
+
+static int qemu_debugcon_detected CAR_GLOBAL;
+
+void qemu_debugcon_init(void)
+{
+ int detected = (inb(CONFIG_CONSOLE_QEMU_DEBUGCON_PORT) == 0xe9);
+ car_set_var(qemu_debugcon_detected, detected);
+ printk(BIOS_INFO, "QEMU debugcon %s [port 0x%x]\n",
+ detected ? "detected" : "not found",
+ CONFIG_CONSOLE_QEMU_DEBUGCON_PORT);
+}
+
+void qemu_debugcon_tx_byte(unsigned char data)
+{
+ if (car_get_var(qemu_debugcon_detected) != 0)
+ outb(data, CONFIG_CONSOLE_QEMU_DEBUGCON_PORT);
+}