/* vbeinfo.c - command to list compatible VBE video modes. */ /* * GRUB -- GRand Unified Bootloader * Copyright (C) 2005,2007,2008,2009 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/dl.h> #include <grub/env.h> #include <grub/misc.h> #include <grub/machine/init.h> #include <grub/machine/vbe.h> #include <grub/mm.h> #include <grub/command.h> #include <grub/i18n.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 (grub_command_t cmd __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; err = grub_vbe_probe (&controller_info); if (err != GRUB_ERR_NONE) return err; grub_printf ("VBE info: version: %d.%d OEM software rev: %d.%d\n", controller_info.version >> 8, controller_info.version & 0xFF, controller_info.oem_software_rev >> 8, controller_info.oem_software_rev & 0xFF); /* The total_memory field is in 64 KiB units. */ grub_printf (" total memory: %d KiB\n", (controller_info.total_memory << 16) / 1024); /* 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); grub_printf ("List of compatible video modes:\n"); grub_printf ("Legend: P=Packed pixel, D=Direct color, " "mask/pos=R/G/B/reserved\n"); /* 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 & GRUB_VBE_MODEATTR_SUPPORTED) == 0) /* If not available, skip it. */ continue; if ((mode_info_tmp.mode_attributes & GRUB_VBE_MODEATTR_RESERVED_1) == 0) /* Not enough information. */ continue; if ((mode_info_tmp.mode_attributes & GRUB_VBE_MODEATTR_COLOR) == 0) /* Monochrome is unusable. */ continue; if ((mode_info_tmp.mode_attributes & GRUB_VBE_MODEATTR_LFB_AVAIL) == 0) /* We support only linear frame buffer modes. */ continue; if ((mode_info_tmp.mode_attributes & GRUB_VBE_MODEATTR_GRAPHICS) == 0) /* We allow only graphical modes. */ continue; switch (mode_info_tmp.memory_model) { case GRUB_VBE_MEMORY_MODEL_PACKED_PIXEL: memory_model = "Packed"; break; case GRUB_VBE_MEMORY_MODEL_DIRECT_COLOR: memory_model = "Direct"; break; default: break; } if (! memory_model) continue; grub_printf ("0x%03x: %4d x %4d x %2d %s", mode, mode_info_tmp.x_resolution, mode_info_tmp.y_resolution, mode_info_tmp.bits_per_pixel, memory_model); /* Show mask and position details for direct color modes. */ if (mode_info_tmp.memory_model == GRUB_VBE_MEMORY_MODEL_DIRECT_COLOR) grub_printf (", mask: %d/%d/%d/%d pos: %d/%d/%d/%d", mode_info_tmp.red_mask_size, mode_info_tmp.green_mask_size, mode_info_tmp.blue_mask_size, mode_info_tmp.rsvd_mask_size, mode_info_tmp.red_field_position, mode_info_tmp.green_field_position, mode_info_tmp.blue_field_position, mode_info_tmp.rsvd_field_position); grub_printf ("\n"); } 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; } static grub_command_t cmd; GRUB_MOD_INIT(vbeinfo) { cmd = grub_register_command ("vbeinfo", grub_cmd_vbeinfo, 0, N_("List compatible VESA BIOS extension video modes.")); } GRUB_MOD_FINI(vbeinfo) { grub_unregister_command (cmd); }