163 lines
4.3 KiB
C
163 lines
4.3 KiB
C
/* vbeinfo.c - command to list compatible VBE video modes. */
|
|
/*
|
|
* GRUB -- GRand Unified Bootloader
|
|
* Copyright (C) 2005,2007 Free Software Foundation, Inc.
|
|
*
|
|
* GRUB 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 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <grub/normal.h>
|
|
#include <grub/dl.h>
|
|
#include <grub/arg.h>
|
|
#include <grub/env.h>
|
|
#include <grub/misc.h>
|
|
#include <grub/machine/init.h>
|
|
#include <grub/machine/vbe.h>
|
|
#include <grub/mm.h>
|
|
|
|
static void *
|
|
real2pm (grub_vbe_farptr_t ptr)
|
|
{
|
|
return (void *) ((((unsigned long) ptr & 0xFFFF0000) >> 12UL)
|
|
+ ((unsigned long) ptr & 0x0000FFFF));
|
|
}
|
|
|
|
static grub_err_t
|
|
grub_cmd_vbeinfo (struct grub_arg_list *state __attribute__ ((unused)),
|
|
int argc __attribute__ ((unused)),
|
|
char **args __attribute__ ((unused)))
|
|
{
|
|
struct grub_vbe_info_block controller_info;
|
|
struct grub_vbe_mode_info_block mode_info_tmp;
|
|
grub_uint32_t use_mode = GRUB_VBE_DEFAULT_VIDEO_MODE;
|
|
grub_uint16_t *video_mode_list;
|
|
grub_uint16_t *p;
|
|
grub_uint16_t *saved_video_mode_list;
|
|
grub_size_t video_mode_list_size;
|
|
grub_err_t err;
|
|
char *modevar;
|
|
|
|
grub_printf ("List of compatible video modes:\n");
|
|
|
|
err = grub_vbe_probe (&controller_info);
|
|
if (err != GRUB_ERR_NONE)
|
|
return err;
|
|
|
|
/* Because the information on video modes is stored in a temporary place,
|
|
it is better to copy it to somewhere safe. */
|
|
p = video_mode_list = real2pm (controller_info.video_mode_ptr);
|
|
while (*p++ != 0xFFFF)
|
|
;
|
|
|
|
video_mode_list_size = (grub_addr_t) p - (grub_addr_t) video_mode_list;
|
|
saved_video_mode_list = grub_malloc (video_mode_list_size);
|
|
if (! saved_video_mode_list)
|
|
return grub_errno;
|
|
|
|
grub_memcpy (saved_video_mode_list, video_mode_list, video_mode_list_size);
|
|
|
|
/* Walk through all video modes listed. */
|
|
for (p = saved_video_mode_list; *p != 0xFFFF; p++)
|
|
{
|
|
const char *memory_model = 0;
|
|
grub_uint32_t mode = (grub_uint32_t) *p;
|
|
|
|
err = grub_vbe_get_video_mode_info (mode, &mode_info_tmp);
|
|
if (err != GRUB_ERR_NONE)
|
|
{
|
|
grub_errno = GRUB_ERR_NONE;
|
|
continue;
|
|
}
|
|
|
|
if ((mode_info_tmp.mode_attributes & 0x001) == 0)
|
|
/* If not available, skip it. */
|
|
continue;
|
|
|
|
if ((mode_info_tmp.mode_attributes & 0x002) == 0)
|
|
/* Not enough information. */
|
|
continue;
|
|
|
|
if ((mode_info_tmp.mode_attributes & 0x008) == 0)
|
|
/* Monochrome is unusable. */
|
|
continue;
|
|
|
|
if ((mode_info_tmp.mode_attributes & 0x080) == 0)
|
|
/* We support only linear frame buffer modes. */
|
|
continue;
|
|
|
|
if ((mode_info_tmp.mode_attributes & 0x010) == 0)
|
|
/* We allow only graphical modes. */
|
|
continue;
|
|
|
|
switch (mode_info_tmp.memory_model)
|
|
{
|
|
case 0x04:
|
|
memory_model = "Packed Pixel";
|
|
break;
|
|
case 0x06:
|
|
memory_model = "Direct Color";
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (! memory_model)
|
|
continue;
|
|
|
|
grub_printf ("0x%03x: %d x %d x %d bpp (%s)\n",
|
|
mode,
|
|
mode_info_tmp.x_resolution,
|
|
mode_info_tmp.y_resolution,
|
|
mode_info_tmp.bits_per_pixel,
|
|
memory_model);
|
|
}
|
|
|
|
grub_free (saved_video_mode_list);
|
|
|
|
/* Check existence of vbe_mode environment variable. */
|
|
modevar = grub_env_get ("vbe_mode");
|
|
|
|
if (modevar != 0)
|
|
{
|
|
unsigned long value;
|
|
|
|
value = grub_strtoul (modevar, 0, 0);
|
|
if (grub_errno == GRUB_ERR_NONE)
|
|
use_mode = value;
|
|
else
|
|
grub_errno = GRUB_ERR_NONE;
|
|
}
|
|
|
|
grub_printf ("Configured VBE mode (vbe_mode) = 0x%03x\n", use_mode);
|
|
|
|
return 0;
|
|
}
|
|
|
|
GRUB_MOD_INIT(vbeinfo)
|
|
{
|
|
(void) mod; /* To stop warning. */
|
|
grub_register_command ("vbeinfo",
|
|
grub_cmd_vbeinfo,
|
|
GRUB_COMMAND_FLAG_BOTH,
|
|
"vbeinfo",
|
|
"List compatible VESA BIOS extension video modes.",
|
|
0);
|
|
}
|
|
|
|
GRUB_MOD_FINI(vbeinfo)
|
|
{
|
|
grub_unregister_command ("vbeinfo");
|
|
}
|