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/bootparam.h>
   6 #include <asm/setup.h>
   7
   8 #include <xen/interface/xen.h>
   9
  10 #include "xen-ops.h"
  11
  12 void __init xen_init_vga(const struct dom0_vga_console_info *info, size_t size)
  13 {
  14         struct screen_info *screen_info = &boot_params.screen_info;
  15
  16         /* This is drawn from a dump from vgacon:startup in
  17          * standard Linux. */
  18         screen_info->orig_video_mode = 3;
  19         screen_info->orig_video_isVGA = 1;
  20         screen_info->orig_video_lines = 25;
  21         screen_info->orig_video_cols = 80;
  22         screen_info->orig_video_ega_bx = 3;
  23         screen_info->orig_video_points = 16;
  24         screen_info->orig_y = screen_info->orig_video_lines - 1;
  25
  26         switch (info->video_type) {
  27         case XEN_VGATYPE_TEXT_MODE_3:
  28                 if (size < offsetof(struct dom0_vga_console_info, u.text_mode_3)
  29                     + sizeof(info->u.text_mode_3))
  30                         break;
  31                 screen_info->orig_video_lines = info->u.text_mode_3.rows;
  32                 screen_info->orig_video_cols = info->u.text_mode_3.columns;
  33                 screen_info->orig_x = info->u.text_mode_3.cursor_x;
  34                 screen_info->orig_y = info->u.text_mode_3.cursor_y;
  35                 screen_info->orig_video_points =
  36                         info->u.text_mode_3.font_height;
  37                 break;
  38
  39         case XEN_VGATYPE_EFI_LFB:
  40         case XEN_VGATYPE_VESA_LFB:
  41                 if (size < offsetof(struct dom0_vga_console_info,
  42                                     u.vesa_lfb.gbl_caps))
  43                         break;
  44                 screen_info->orig_video_isVGA = VIDEO_TYPE_VLFB;
  45                 screen_info->lfb_width = info->u.vesa_lfb.width;
  46                 screen_info->lfb_height = info->u.vesa_lfb.height;
  47                 screen_info->lfb_depth = info->u.vesa_lfb.bits_per_pixel;
  48                 screen_info->lfb_base = info->u.vesa_lfb.lfb_base;
  49                 screen_info->lfb_size = info->u.vesa_lfb.lfb_size;
  50                 screen_info->lfb_linelength = info->u.vesa_lfb.bytes_per_line;
  51                 screen_info->red_size = info->u.vesa_lfb.red_size;
  52                 screen_info->red_pos = info->u.vesa_lfb.red_pos;
  53                 screen_info->green_size = info->u.vesa_lfb.green_size;
  54                 screen_info->green_pos = info->u.vesa_lfb.green_pos;
  55                 screen_info->blue_size = info->u.vesa_lfb.blue_size;
  56                 screen_info->blue_pos = info->u.vesa_lfb.blue_pos;
  57                 screen_info->rsvd_size = info->u.vesa_lfb.rsvd_size;
  58                 screen_info->rsvd_pos = info->u.vesa_lfb.rsvd_pos;
  59
  60                 if (size >= offsetof(struct dom0_vga_console_info,
  61                                      u.vesa_lfb.ext_lfb_base)
  62                     + sizeof(info->u.vesa_lfb.ext_lfb_base)
  63                     && info->u.vesa_lfb.ext_lfb_base) {
  64                         screen_info->ext_lfb_base = info->u.vesa_lfb.ext_lfb_base;
  65                         screen_info->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
  66                 }
  67
  68                 if (info->video_type == XEN_VGATYPE_EFI_LFB) {
  69                         screen_info->orig_video_isVGA = VIDEO_TYPE_EFI;
  70                         break;
  71                 }
  72
  73                 if (size >= offsetof(struct dom0_vga_console_info,
  74                                      u.vesa_lfb.mode_attrs)
  75                     + sizeof(info->u.vesa_lfb.mode_attrs))
  76                         screen_info->vesa_attributes = info->u.vesa_lfb.mode_attrs;
  77                 break;
  78         }
  79 }