iPXE
vmware.c
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00001 /*
00002  * Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
00003  *
00004  * This program is free software; you can redistribute it and/or
00005  * modify it under the terms of the GNU General Public License as
00006  * published by the Free Software Foundation; either version 2 of the
00007  * License, or any later version.
00008  *
00009  * This program is distributed in the hope that it will be useful, but
00010  * WITHOUT ANY WARRANTY; without even the implied warranty of
00011  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012  * General Public License for more details.
00013  *
00014  * You should have received a copy of the GNU General Public License
00015  * along with this program; if not, write to the Free Software
00016  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
00017  * 02110-1301, USA.
00018  *
00019  * You can also choose to distribute this program under the terms of
00020  * the Unmodified Binary Distribution Licence (as given in the file
00021  * COPYING.UBDL), provided that you have satisfied its requirements.
00022  */
00023 
00024 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
00025 
00026 /** @file
00027  *
00028  * VMware backdoor mechanism
00029  *
00030  * Based on the unofficial documentation at
00031  *
00032  *   http://sites.google.com/site/chitchatvmback/backdoor
00033  *
00034  */
00035 
00036 #include <stdint.h>
00037 #include <errno.h>
00038 #include <ipxe/vmware.h>
00039 
00040 /**
00041  * Detect VMware presence
00042  *
00043  * @ret rc              Return status code
00044  */
00045 int vmware_present ( void ) {
00046         uint32_t version;
00047         uint32_t magic;
00048         uint32_t product_type;
00049 
00050         /* Perform backdoor call */
00051         vmware_cmd_get_version ( &version, &magic, &product_type );
00052 
00053         /* Check for VMware presence */
00054         if ( magic != VMW_MAGIC ) {
00055                 DBGC ( VMW_MAGIC, "VMware not present\n" );
00056                 return -ENOENT;
00057         }
00058 
00059         DBGC ( VMW_MAGIC, "VMware product type %04x version %08x detected\n",
00060                product_type, version );
00061         return 0;
00062 }