diff options
author | Yang Zhang <yang.z.zhang@intel.com> | 2015-08-28 09:58:54 +0800 |
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committer | Yang Zhang <yang.z.zhang@intel.com> | 2015-09-01 12:44:00 +0800 |
commit | e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb (patch) | |
tree | 66b09f592c55df2878107a468a91d21506104d3f /qemu/roms/ipxe/src/arch/x86/core/debugcon.c | |
parent | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (diff) |
Add qemu 2.4.0
Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5
Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Diffstat (limited to 'qemu/roms/ipxe/src/arch/x86/core/debugcon.c')
-rw-r--r-- | qemu/roms/ipxe/src/arch/x86/core/debugcon.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/qemu/roms/ipxe/src/arch/x86/core/debugcon.c b/qemu/roms/ipxe/src/arch/x86/core/debugcon.c new file mode 100644 index 000000000..263cb4af1 --- /dev/null +++ b/qemu/roms/ipxe/src/arch/x86/core/debugcon.c @@ -0,0 +1,86 @@ +/* + * 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. + */ + +FILE_LICENCE ( GPL2_OR_LATER ); + +/** @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, +}; |