| /* |
| * 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. |
| */ |
| |
| #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); |
| } |