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- /*
- * Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
- *
- * 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; either version 2 of the
- * License, or (at your option) any later version.
- *
- * 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 Street, Fifth Floor, Boston, MA
- * 02110-1301, USA.
- *
- * You can also choose to distribute this program under the terms of
- * the Unmodified Binary Distribution Licence (as given in the file
- * COPYING.UBDL), provided that you have satisfied its requirements.
- */
-
- FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
-
- /** @file
- *
- * Debug port console
- *
- * The debug port is supported by bochs (via the "port_e9_hack"
- * configuration file directive) and by qemu (via the "-debugcon"
- * command-line option).
- */
-
- #include <stdint.h>
- #include <ipxe/io.h>
- #include <ipxe/console.h>
- #include <ipxe/init.h>
- #include <config/console.h>
-
- /** Debug port */
- #define DEBUG_PORT 0xe9
-
- /** Debug port installation check magic value */
- #define DEBUG_PORT_CHECK 0xe9
-
- /* Set default console usage if applicable */
- #if ! ( defined ( CONSOLE_DEBUGCON ) && CONSOLE_EXPLICIT ( CONSOLE_DEBUGCON ) )
- #undef CONSOLE_DEBUGCON
- #define CONSOLE_DEBUGCON ( CONSOLE_USAGE_ALL & ~CONSOLE_USAGE_TUI )
- #endif
-
- /**
- * Print a character to debug port console
- *
- * @v character Character to be printed
- */
- static void debugcon_putchar ( int character ) {
-
- /* Write character to debug port */
- outb ( character, DEBUG_PORT );
- }
-
- /** Debug port console driver */
- struct console_driver debugcon_console __console_driver = {
- .putchar = debugcon_putchar,
- .usage = CONSOLE_DEBUGCON,
- };
-
- /**
- * Initialise debug port console
- *
- */
- static void debugcon_init ( void ) {
- uint8_t check;
-
- /* Check if console is present */
- check = inb ( DEBUG_PORT );
- if ( check != DEBUG_PORT_CHECK ) {
- DBG ( "Debug port not present; disabling console\n" );
- debugcon_console.disabled = CONSOLE_DISABLED;
- }
- }
-
- /**
- * Debug port console initialisation function
- */
- struct init_fn debugcon_init_fn __init_fn ( INIT_EARLY ) = {
- .initialise = debugcon_init,
- };
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