4321d60acb
Change-Id: Ie0507475f33d029d6e8ce59f138e0e7da5156d4f Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-on: http://review.coreboot.org/3339 Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2013 Red Hat Inc.
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* Written by Gerd Hoffmann <kraxel@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <console/console.h>
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#include <arch/io.h>
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static unsigned char readback;
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static void debugcon_init(void)
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{
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readback = inb(CONFIG_CONSOLE_QEMU_DEBUGCON_PORT);
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printk(BIOS_INFO, "QEMU debugcon %s [port 0x%x]\n",
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(readback == 0xe9) ? "detected" : "not found",
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CONFIG_CONSOLE_QEMU_DEBUGCON_PORT);
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}
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static void debugcon_tx_byte(unsigned char data)
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{
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if (readback == 0xe9) {
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outb(data, CONFIG_CONSOLE_QEMU_DEBUGCON_PORT);
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}
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}
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static void debugcon_tx_flush(void)
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{
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}
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static unsigned char debugcon_rx_byte(void)
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{
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return 0;
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}
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static int debugcon_tst_byte(void)
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{
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return 0;
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}
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static const struct console_driver debugcon_console __console = {
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.init = debugcon_init,
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.tx_byte = debugcon_tx_byte,
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.tx_flush = debugcon_tx_flush,
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.rx_byte = debugcon_rx_byte,
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.tst_byte = debugcon_tst_byte,
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};
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