arch/x86/xen/vga.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/screen_info.h>
   3 #include <linux/init.h>
   4
   5 #include <asm/setup.h>
   6
   7 #include <xen/interface/xen.h>
   8
   9 #include "xen-ops.h"
  10
  11 void __init xen_init_vga(const struct dom0_vga_console_info *info, size_t size,
  12                          struct screen_info *screen_info)
  13 {
  14         /* This is drawn from a dump from vgacon:startup in
  15          * standard Linux. */
  16         screen_info->orig_video_mode = 3;
  17         screen_info->orig_video_isVGA = 1;
  18         screen_info->orig_video_lines = 25;
  19         screen_info->orig_video_cols = 80;
  20         screen_info->orig_video_ega_bx = 3;
  21         screen_info->orig_video_points = 16;
  22         screen_info->orig_y = screen_info->orig_video_lines - 1;
  23
  24         switch (info->video_type) {
  25         case XEN_VGATYPE_TEXT_MODE_3:
  26                 if (size < offsetof(struct dom0_vga_console_info, u.text_mode_3)
  27                     + sizeof(info->u.text_mode_3))
  28                         break;
  29                 screen_info->orig_video_lines = info->u.text_mode_3.rows;
  30                 screen_info->orig_video_cols = info->u.text_mode_3.columns;
  31                 screen_info->orig_x = info->u.text_mode_3.cursor_x;
  32                 screen_info->orig_y = info->u.text_mode_3.cursor_y;
  33                 screen_info->orig_video_points =
  34                         info->u.text_mode_3.font_height;
  35                 break;
  36
  37         case XEN_VGATYPE_EFI_LFB:
  38         case XEN_VGATYPE_VESA_LFB:
  39                 if (size < offsetof(struct dom0_vga_console_info,
  40                                     u.vesa_lfb.gbl_caps))
  41                         break;
  42                 screen_info->orig_video_isVGA = VIDEO_TYPE_VLFB;
  43                 screen_info->lfb_width = info->u.vesa_lfb.width;
  44                 screen_info->lfb_height = info->u.vesa_lfb.height;
  45                 screen_info->lfb_depth = info->u.vesa_lfb.bits_per_pixel;
  46                 screen_info->lfb_base = info->u.vesa_lfb.lfb_base;
  47                 screen_info->lfb_size = info->u.vesa_lfb.lfb_size;
  48                 screen_info->lfb_linelength = info->u.vesa_lfb.bytes_per_line;
  49                 screen_info->red_size = info->u.vesa_lfb.red_size;
  50                 screen_info->red_pos = info->u.vesa_lfb.red_pos;
  51                 screen_info->green_size = info->u.vesa_lfb.green_size;
  52                 screen_info->green_pos = info->u.vesa_lfb.green_pos;
  53                 screen_info->blue_size = info->u.vesa_lfb.blue_size;
  54                 screen_info->blue_pos = info->u.vesa_lfb.blue_pos;
  55                 screen_info->rsvd_size = info->u.vesa_lfb.rsvd_size;
  56                 screen_info->rsvd_pos = info->u.vesa_lfb.rsvd_pos;
  57
  58                 if (size >= offsetof(struct dom0_vga_console_info,
  59                                      u.vesa_lfb.ext_lfb_base)
  60                     + sizeof(info->u.vesa_lfb.ext_lfb_base)
  61                     && info->u.vesa_lfb.ext_lfb_base) {
  62                         screen_info->ext_lfb_base = info->u.vesa_lfb.ext_lfb_base;
  63                         screen_info->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
  64                 }
  65
  66                 if (info->video_type == XEN_VGATYPE_EFI_LFB) {
  67                         screen_info->orig_video_isVGA = VIDEO_TYPE_EFI;
  68                         break;
  69                 }
  70
  71                 if (size >= offsetof(struct dom0_vga_console_info,
  72                                      u.vesa_lfb.mode_attrs)
  73                     + sizeof(info->u.vesa_lfb.mode_attrs))
  74                         screen_info->vesa_attributes = info->u.vesa_lfb.mode_attrs;
  75                 break;
  76         }
  77 }