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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2000,2001,2002,2003,2004,2005,2007,2008,2009,2010 Free Software Foundation, Inc.
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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#define grub_video_render_target grub_video_fbrender_target
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#include <grub/machine/vga.h>
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#include <grub/machine/console.h>
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#include <grub/cpu/io.h>
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#include <grub/video.h>
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#include <grub/video_fb.h>
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#include <grub/types.h>
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#include <grub/misc.h>
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#define VGA_HEIGHT 350
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#define VGA_MEM ((grub_uint8_t *) GRUB_MEMORY_MACHINE_VGA_ADDR)
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#define PAGE_OFFSET(x) ((x) * (VGA_WIDTH * VGA_HEIGHT / 8))
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static unsigned char text_mode;
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static unsigned char saved_map_mask;
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struct grub_video_mode_info mode_info;
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struct grub_video_render_target *render_target;
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grub_uint8_t *temporary_buffer;
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/* Wait until there is a vertical retrace. */
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while (! (grub_inb (GRUB_VGA_IO_INPUT_STATUS1_REGISTER)
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& GRUB_VGA_IO_INPUT_STATUS1_VERTR_BIT));
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/* Get Map Mask Register. */
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return grub_vga_sr_read (GRUB_VGA_SR_MAP_MASK_REGISTER);
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/* Set Map Mask Register. */
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set_map_mask (unsigned char mask)
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grub_vga_sr_write (mask, GRUB_VGA_SR_MAP_MASK_REGISTER);
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/* Set Read Map Register. */
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set_read_map (unsigned char map)
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grub_vga_gr_write (map, GRUB_VGA_GR_READ_MAP_REGISTER);
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/* Set start address. */
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set_start_address (unsigned int start)
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grub_vga_cr_write (start & 0xFF, GRUB_VGA_CR_START_ADDR_LOW_REGISTER);
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grub_vga_cr_write (start >> 8, GRUB_VGA_CR_START_ADDR_HIGH_REGISTER);
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static int is_target = 0;
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grub_video_vga_init (void)
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grub_video_vga_setup (unsigned int width, unsigned int height,
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unsigned int mode_type, unsigned int mode_mask)
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if ((width && width != VGA_WIDTH) || (height && height != VGA_HEIGHT))
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return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "no matching mode found");
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framebuffer.temporary_buffer = grub_malloc (VGA_HEIGHT * VGA_WIDTH);
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framebuffer.front_page = 0;
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framebuffer.back_page = 0;
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if (!framebuffer.temporary_buffer)
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saved_map_mask = get_map_mask ();
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text_mode = grub_vga_set_mode (0x10);
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set_start_address (PAGE_OFFSET (framebuffer.front_page));
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framebuffer.mode_info.width = VGA_WIDTH;
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framebuffer.mode_info.height = VGA_HEIGHT;
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framebuffer.mode_info.mode_type = GRUB_VIDEO_MODE_TYPE_INDEX_COLOR;
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if (grub_video_check_mode_flag (mode_type, mode_mask,
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GRUB_VIDEO_MODE_TYPE_DOUBLE_BUFFERED, 1))
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framebuffer.back_page = 1;
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framebuffer.mode_info.mode_type |= GRUB_VIDEO_MODE_TYPE_DOUBLE_BUFFERED;
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framebuffer.mode_info.bpp = 8;
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framebuffer.mode_info.bytes_per_pixel = 1;
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framebuffer.mode_info.pitch = VGA_WIDTH;
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framebuffer.mode_info.number_of_colors = 16;
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framebuffer.mode_info.red_mask_size = 0;
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framebuffer.mode_info.red_field_pos = 0;
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framebuffer.mode_info.green_mask_size = 0;
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framebuffer.mode_info.green_field_pos = 0;
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framebuffer.mode_info.blue_mask_size = 0;
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framebuffer.mode_info.blue_field_pos = 0;
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framebuffer.mode_info.reserved_mask_size = 0;
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framebuffer.mode_info.reserved_field_pos = 0;
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framebuffer.mode_info.blit_format
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= grub_video_get_blit_format (&framebuffer.mode_info);
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err = grub_video_fb_create_render_target_from_pointer (&framebuffer.render_target,
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&framebuffer.mode_info,
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framebuffer.temporary_buffer);
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grub_dprintf ("video", "Couldn't create FB target\n");
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err = grub_video_fb_set_active_render_target (framebuffer.render_target);
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err = grub_video_fb_set_palette (0, GRUB_VIDEO_FBSTD_NUMCOLORS,
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grub_video_fbstd_colors);
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return GRUB_ERR_NONE;
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grub_video_vga_fini (void)
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set_map_mask (saved_map_mask);
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grub_vga_set_mode (text_mode);
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grub_free (framebuffer.temporary_buffer);
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framebuffer.temporary_buffer = 0;
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return GRUB_ERR_NONE;
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for (plane = 0x01; plane <= 0x08; plane <<= 1)
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volatile grub_uint8_t *ptr2;
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set_map_mask (plane);
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for (ptr = framebuffer.temporary_buffer,
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ptr2 = VGA_MEM + PAGE_OFFSET (framebuffer.back_page);
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ptr < framebuffer.temporary_buffer + VGA_WIDTH * VGA_HEIGHT; ptr++)
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cbyte |= (!!(plane & *ptr)) << shift;
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grub_video_vga_blit_bitmap (struct grub_video_bitmap *bitmap,
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enum grub_video_blit_operators oper, int x, int y,
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int offset_x, int offset_y,
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unsigned int width, unsigned int height)
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ret = grub_video_fb_blit_bitmap (bitmap, oper, x, y, offset_x, offset_y,
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grub_video_vga_blit_render_target (struct grub_video_fbrender_target *source,
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enum grub_video_blit_operators oper,
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int x, int y, int offset_x, int offset_y,
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unsigned int width, unsigned int height)
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ret = grub_video_fb_blit_render_target (source, oper, x, y,
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offset_x, offset_y, width, height);
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grub_video_vga_set_active_render_target (struct grub_video_render_target *target)
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if (target == GRUB_VIDEO_RENDER_TARGET_DISPLAY)
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target = framebuffer.render_target;
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return grub_video_fb_set_active_render_target (target);
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grub_video_vga_get_active_render_target (struct grub_video_render_target **target)
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err = grub_video_fb_get_active_render_target (target);
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if (*target == framebuffer.render_target)
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*target = GRUB_VIDEO_RENDER_TARGET_DISPLAY;
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return GRUB_ERR_NONE;
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grub_video_vga_swap_buffers (void)
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if (!(framebuffer.mode_info.mode_type & GRUB_VIDEO_MODE_TYPE_DOUBLE_BUFFERED))
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return GRUB_ERR_NONE;
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/* Activate the other page. */
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framebuffer.front_page = !framebuffer.front_page;
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framebuffer.back_page = !framebuffer.back_page;
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set_start_address (PAGE_OFFSET (framebuffer.front_page));
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return GRUB_ERR_NONE;
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grub_video_vga_set_palette (unsigned int start __attribute__ ((unused)),
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unsigned int count __attribute__ ((unused)),
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struct grub_video_palette_data *palette_data __attribute__ ((unused)))
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return grub_error (GRUB_ERR_IO, "can't change palette");
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grub_video_vga_get_info_and_fini (struct grub_video_mode_info *mode_info,
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grub_memcpy (mode_info, &(framebuffer.mode_info), sizeof (*mode_info));
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mode_info->bytes_per_pixel = 0;
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mode_info->pitch = VGA_WIDTH / 8;
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mode_info->number_of_colors = 1;
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mode_info->bg_red = 0;
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mode_info->bg_green = 0;
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mode_info->bg_blue = 0;
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mode_info->bg_alpha = 255;
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mode_info->fg_red = 255;
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mode_info->fg_green = 255;
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mode_info->fg_blue = 255;
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mode_info->fg_alpha = 255;
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*framebuf = VGA_MEM + PAGE_OFFSET (framebuffer.front_page);
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grub_video_fb_fini ();
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grub_free (framebuffer.temporary_buffer);
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framebuffer.temporary_buffer = 0;
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return GRUB_ERR_NONE;
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static struct grub_video_adapter grub_video_vga_adapter =
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.name = "VGA Video Driver",
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.id = GRUB_VIDEO_DRIVER_VGA,
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.prio = GRUB_VIDEO_ADAPTER_PRIO_FALLBACK,
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.init = grub_video_vga_init,
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.fini = grub_video_vga_fini,
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.setup = grub_video_vga_setup,
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.get_info = grub_video_fb_get_info,
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.get_info_and_fini = grub_video_vga_get_info_and_fini,
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.set_palette = grub_video_vga_set_palette,
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.get_palette = grub_video_fb_get_palette,
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.set_viewport = grub_video_fb_set_viewport,
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.get_viewport = grub_video_fb_get_viewport,
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.map_color = grub_video_fb_map_color,
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.map_rgb = grub_video_fb_map_rgb,
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.map_rgba = grub_video_fb_map_rgba,
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.unmap_color = grub_video_fb_unmap_color,
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.fill_rect = grub_video_fb_fill_rect,
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.blit_bitmap = grub_video_vga_blit_bitmap,
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.blit_render_target = grub_video_vga_blit_render_target,
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.scroll = grub_video_fb_scroll,
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.swap_buffers = grub_video_vga_swap_buffers,
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.create_render_target = grub_video_fb_create_render_target,
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.delete_render_target = grub_video_fb_delete_render_target,
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.set_active_render_target = grub_video_vga_set_active_render_target,
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.get_active_render_target = grub_video_vga_get_active_render_target,
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grub_video_register (&grub_video_vga_adapter);
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grub_video_unregister (&grub_video_vga_adapter);