From 038aa29dc283205a993578f0ff3881df12ebdb0a Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Wed, 29 May 2013 13:06:22 +0200 Subject: console: add support for QEMU's debugcon Add support for sending debug output to an I/O port. It can be used together with QEMU's isa-debugcon driver to log the coreboot output to a file. The port is configurable and defaults to 0x402 which has established as the de facto standard. For example, SeaBIOS+OVMF [1] use that one too. [1] http://www.linux-kvm.org/page/OVMF Open Virtual Machine Firmware Change-Id: I0803f7fc70030242f80003e25c9449c37d71975e Signed-off-by: Gerd Hoffmann Reviewed-on: http://review.coreboot.org/3331 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel Reviewed-by: Ronald G. Minnich --- src/console/debugcon_console.c | 53 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 src/console/debugcon_console.c (limited to 'src/console/debugcon_console.c') diff --git a/src/console/debugcon_console.c b/src/console/debugcon_console.c new file mode 100644 index 0000000000..a9bc7d3cc6 --- /dev/null +++ b/src/console/debugcon_console.c @@ -0,0 +1,53 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2013 Red Hat Inc. + * Written by Gerd Hoffmann + * + * 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 +#include + +static void debugcon_init(void) +{ +} + +static void debugcon_tx_byte(unsigned char data) +{ + outb(data, CONFIG_CONSOLE_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, +}; -- cgit v1.2.3