/* * 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 <arch/io.h> static unsigned char readback; static void debugcon_init(void) { readback = inb(CONFIG_CONSOLE_QEMU_DEBUGCON_PORT); printk(BIOS_INFO, "QEMU debugcon %s [port 0x%x]\n", (readback == 0xe9) ? "detected" : "not found", CONFIG_CONSOLE_QEMU_DEBUGCON_PORT); } static void debugcon_tx_byte(unsigned char data) { if (readback == 0xe9) { outb(data, CONFIG_CONSOLE_QEMU_DEBUGCON_PORT); } } static void debugcon_tx_flush(void) { } static unsigned char debugcon_rx_byte(void) { return 0; } static int debugcon_tst_byte(void) { return 0; } static const struct console_driver debugcon_console __console = { .init = debugcon_init, .tx_byte = debugcon_tx_byte, .tx_flush = debugcon_tx_flush, .rx_byte = debugcon_rx_byte, .tst_byte = debugcon_tst_byte, };