1
/* vbeinfo.c - command to list compatible VBE video modes. */
3
* GRUB -- GRand Unified Bootloader
4
* Copyright (C) 2005,2007,2008,2009 Free Software Foundation, Inc.
6
* GRUB is free software: you can redistribute it and/or modify
7
* it under the terms of the GNU General Public License as published by
8
* the Free Software Foundation, either version 3 of the License, or
9
* (at your option) any later version.
11
* GRUB is distributed in the hope that it will be useful,
12
* but WITHOUT ANY WARRANTY; without even the implied warranty of
13
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14
* GNU General Public License for more details.
16
* You should have received a copy of the GNU General Public License
17
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
22
#include <grub/misc.h>
23
#include <grub/machine/init.h>
24
#include <grub/machine/vbe.h>
26
#include <grub/command.h>
27
#include <grub/i18n.h>
30
real2pm (grub_vbe_farptr_t ptr)
32
return (void *) ((((unsigned long) ptr & 0xFFFF0000) >> 12UL)
33
+ ((unsigned long) ptr & 0x0000FFFF));
37
grub_cmd_vbeinfo (grub_command_t cmd __attribute__ ((unused)),
38
int argc __attribute__ ((unused)),
39
char **args __attribute__ ((unused)))
41
struct grub_vbe_info_block controller_info;
42
struct grub_vbe_mode_info_block mode_info_tmp;
43
grub_uint32_t use_mode = GRUB_VBE_DEFAULT_VIDEO_MODE;
44
grub_uint16_t *video_mode_list;
46
grub_uint16_t *saved_video_mode_list;
47
grub_size_t video_mode_list_size;
51
err = grub_vbe_probe (&controller_info);
52
if (err != GRUB_ERR_NONE)
55
grub_printf ("VBE info: version: %d.%d OEM software rev: %d.%d\n",
56
controller_info.version >> 8,
57
controller_info.version & 0xFF,
58
controller_info.oem_software_rev >> 8,
59
controller_info.oem_software_rev & 0xFF);
61
/* The total_memory field is in 64 KiB units. */
62
grub_printf (" total memory: %d KiB\n",
63
(controller_info.total_memory << 16) / 1024);
65
/* Because the information on video modes is stored in a temporary place,
66
it is better to copy it to somewhere safe. */
67
p = video_mode_list = real2pm (controller_info.video_mode_ptr);
68
while (*p++ != 0xFFFF)
71
video_mode_list_size = (grub_addr_t) p - (grub_addr_t) video_mode_list;
72
saved_video_mode_list = grub_malloc (video_mode_list_size);
73
if (! saved_video_mode_list)
76
grub_memcpy (saved_video_mode_list, video_mode_list, video_mode_list_size);
78
grub_printf ("List of compatible video modes:\n");
79
grub_printf ("Legend: P=Packed pixel, D=Direct color, "
80
"mask/pos=R/G/B/reserved\n");
82
/* Walk through all video modes listed. */
83
for (p = saved_video_mode_list; *p != 0xFFFF; p++)
85
const char *memory_model = 0;
86
grub_uint32_t mode = (grub_uint32_t) *p;
88
err = grub_vbe_get_video_mode_info (mode, &mode_info_tmp);
89
if (err != GRUB_ERR_NONE)
91
grub_errno = GRUB_ERR_NONE;
95
if ((mode_info_tmp.mode_attributes & GRUB_VBE_MODEATTR_SUPPORTED) == 0)
96
/* If not available, skip it. */
99
if ((mode_info_tmp.mode_attributes & GRUB_VBE_MODEATTR_RESERVED_1) == 0)
100
/* Not enough information. */
103
if ((mode_info_tmp.mode_attributes & GRUB_VBE_MODEATTR_COLOR) == 0)
104
/* Monochrome is unusable. */
107
if ((mode_info_tmp.mode_attributes & GRUB_VBE_MODEATTR_LFB_AVAIL) == 0)
108
/* We support only linear frame buffer modes. */
111
if ((mode_info_tmp.mode_attributes & GRUB_VBE_MODEATTR_GRAPHICS) == 0)
112
/* We allow only graphical modes. */
115
switch (mode_info_tmp.memory_model)
117
case GRUB_VBE_MEMORY_MODEL_PACKED_PIXEL:
118
memory_model = "Packed";
120
case GRUB_VBE_MEMORY_MODEL_DIRECT_COLOR:
121
memory_model = "Direct";
131
grub_printf ("0x%03x: %4d x %4d x %2d %s",
133
mode_info_tmp.x_resolution,
134
mode_info_tmp.y_resolution,
135
mode_info_tmp.bits_per_pixel,
138
/* Show mask and position details for direct color modes. */
139
if (mode_info_tmp.memory_model == GRUB_VBE_MEMORY_MODEL_DIRECT_COLOR)
140
grub_printf (", mask: %d/%d/%d/%d pos: %d/%d/%d/%d",
141
mode_info_tmp.red_mask_size,
142
mode_info_tmp.green_mask_size,
143
mode_info_tmp.blue_mask_size,
144
mode_info_tmp.rsvd_mask_size,
145
mode_info_tmp.red_field_position,
146
mode_info_tmp.green_field_position,
147
mode_info_tmp.blue_field_position,
148
mode_info_tmp.rsvd_field_position);
152
grub_free (saved_video_mode_list);
154
/* Check existence of vbe_mode environment variable. */
155
modevar = grub_env_get ("vbe_mode");
161
value = grub_strtoul (modevar, 0, 0);
162
if (grub_errno == GRUB_ERR_NONE)
165
grub_errno = GRUB_ERR_NONE;
168
grub_printf ("Configured VBE mode (vbe_mode) = 0x%03x\n", use_mode);
173
static grub_command_t cmd;
175
GRUB_MOD_INIT(vbeinfo)
178
grub_register_command ("vbeinfo", grub_cmd_vbeinfo, 0,
179
N_("List compatible VESA BIOS extension video modes."));
182
GRUB_MOD_FINI(vbeinfo)
184
grub_unregister_command (cmd);