Hi all!
I tried to build a module to detect vmware. Attached is the module and a test
grub.cfg
It is basically working though I have some questions:
can i use the return value of the function (e.g. vmware_detect) to give back a
value or am I supposed to always return something like GRUB_ERR_NONE?
is there a script to add a module to the makefile or do I have to copy/paste
it?
if I use this:
if vmware_detect = 1; then set foo=1 else set foo=0 fi
I get syntax error and unknown command in an infinite loop is this expected?
It should not be a problem with my module, as it also happend while testing a
environment variable.
So, is it a problem with my if-syntax?
greetings
Martin
PS:*ahem* I tested against 1.95+20070604 of the debian tree. I will test
against current cvs as soon as possible / as soon as someone tells me how to
automate the makefile updating
insmod vmware-detect
vmware_detect
set default=2
if vmware = 0; then set default=1 else set default=0 fi
menuentry "nummer0" {
linux (hd0,6)/boot/vmlinuz
}
menuentry "nummer1" {
linux (hd0,6)/boot/vmlinuz
}
/* vmware-detect.c - module to detect vmware */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2007 Martin HaaÃ
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* VMWARE detection code taken from
* http://chitchat.at.infoseek.co.jp/vmware/backdoor.html
*/
#include <grub/normal.h>
#include <grub/dl.h>
#include <grub/arg.h>
#include <grub/misc.h>
#include <grub/mm.h>
#include <grub/env.h>
//this gives a warning, but looks more fancy than VMWARE_MAGIC 0x564D5868
#define VMWARE_MAGIC 'VMXh'
#define VMWARE_COMMAND_GETVERSION 0x000a
#define VMWARE_PORTNUMBER 0x5658
static void vmware_getversion( unsigned int *version_number, unsigned int *magic_number,
unsigned int *product_type)
{
grub_dprintf ("vmware","requesting vmware version\n");
//reference for this is given at top of file,
//no further magic involved than inline asm
__asm__("inl %%dx, %%eax\n\t"
//outputs
: "=a" (*version_number),
"=b" (*magic_number),
"=c" (*product_type)
//inputs
: "a" (VMWARE_MAGIC),
"b" (0),
"c" (VMWARE_COMMAND_GETVERSION),
"d" (VMWARE_PORTNUMBER)
);
grub_dprintf("vmware","magic:0x%x, version:0x%x, product 0x%x\n",*magic_number, *version_number, *product_type);
}
static grub_err_t
grub_cmd_vmwaredetect (struct grub_arg_list *state __attribute__ ((unused)),
int argc __attribute__ ((unused)),
char **args __attribute__ ((unused)))
{
unsigned int version_number;
unsigned int magic_number;
unsigned int product_type;
vmware_getversion(&version_number,&magic_number,&product_type);
if (magic_number == VMWARE_MAGIC) {
grub_dprintf("vmware","inside in a vmware\n");
grub_env_set("vmware","1");
return 1;
} else {
grub_dprintf("vmware","not in a vmware\n");
grub_env_set("vmware","0");
return 0;
}
}
static grub_err_t
grub_cmd_vmwareversion (struct grub_arg_list *state __attribute__ ((unused)),
int argc __attribute__ ((unused)),
char **args __attribute__ ((unused)))
{
unsigned int version_number;
unsigned int magic_number;
unsigned int product_type;
vmware_getversion(&version_number,&magic_number,&product_type);
if (magic_number == VMWARE_MAGIC) {
grub_dprintf("vmware","version number 0x%x\n",version_number);
return version_number;
} else {
grub_dprintf("vmware","not in a vmware\n");
return 0;
}
}
static grub_err_t
grub_cmd_vmwaretype (struct grub_arg_list *state __attribute__ ((unused)),
int argc __attribute__ ((unused)),
char **args __attribute__ ((unused)))
{
unsigned int version_number;
unsigned int magic_number;
unsigned int product_type;
vmware_getversion(&version_number,&magic_number,&product_type);
if (magic_number == VMWARE_MAGIC) {
grub_dprintf("vmware","product type 0x%x\n",product_type);
return product_type;
} else {
grub_dprintf("vmware","not in a vmware\n");
return 0;
}
}
GRUB_MOD_INIT(vmwaredetect)
{
(void)mod; /* To stop warning. */
grub_register_command ("vmware_detect", grub_cmd_vmwaredetect, GRUB_COMMAND_FLAG_BOTH,
"vmware_detect", "returns 1 if inside vmware, 0 otherwise. "
"set debug=\"vmware\" to see more", 0);
grub_register_command ("vmware_version", grub_cmd_vmwareversion, GRUB_COMMAND_FLAG_BOTH,
"vmware_version", "returns version number(always 6?)", 0);
grub_register_command ("vmware_type", grub_cmd_vmwaretype, GRUB_COMMAND_FLAG_BOTH,
"vmware_type", "returns product type", 0);
}
GRUB_MOD_FINI(vmwaredetect)
{
grub_unregister_command ("vmware_detect");
grub_unregister_command ("vmware_version");
grub_unregister_command ("vmware_type");
}
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