x86/xen/vga.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <linux/screen_info.h>
0003 #include <linux/init.h>
0004
0005 #include <asm/bootparam.h>
0006 #include <asm/setup.h>
0007
0008 #include <xen/interface/xen.h>
0009
0010 #include "xen-ops.h"
0011
0012 void __init xen_init_vga(const struct dom0_vga_console_info *info, size_t size)
0013 {
0014     struct screen_info *screen_info = &boot_params.screen_info;
0015
0016     /* This is drawn from a dump from vgacon:startup in
0017      * standard Linux. */
0018     screen_info->orig_video_mode = 3;
0019     screen_info->orig_video_isVGA = 1;
0020     screen_info->orig_video_lines = 25;
0021     screen_info->orig_video_cols = 80;
0022     screen_info->orig_video_ega_bx = 3;
0023     screen_info->orig_video_points = 16;
0024     screen_info->orig_y = screen_info->orig_video_lines - 1;
0025
0026     switch (info->video_type) {
0027     case XEN_VGATYPE_TEXT_MODE_3:
0028         if (size < offsetof(struct dom0_vga_console_info, u.text_mode_3)
0029             + sizeof(info->u.text_mode_3))
0030             break;
0031         screen_info->orig_video_lines = info->u.text_mode_3.rows;
0032         screen_info->orig_video_cols = info->u.text_mode_3.columns;
0033         screen_info->orig_x = info->u.text_mode_3.cursor_x;
0034         screen_info->orig_y = info->u.text_mode_3.cursor_y;
0035         screen_info->orig_video_points =
0036             info->u.text_mode_3.font_height;
0037         break;
0038
0039     case XEN_VGATYPE_EFI_LFB:
0040     case XEN_VGATYPE_VESA_LFB:
0041         if (size < offsetof(struct dom0_vga_console_info,
0042                     u.vesa_lfb.gbl_caps))
0043             break;
0044         screen_info->orig_video_isVGA = VIDEO_TYPE_VLFB;
0045         screen_info->lfb_width = info->u.vesa_lfb.width;
0046         screen_info->lfb_height = info->u.vesa_lfb.height;
0047         screen_info->lfb_depth = info->u.vesa_lfb.bits_per_pixel;
0048         screen_info->lfb_base = info->u.vesa_lfb.lfb_base;
0049         screen_info->lfb_size = info->u.vesa_lfb.lfb_size;
0050         screen_info->lfb_linelength = info->u.vesa_lfb.bytes_per_line;
0051         screen_info->red_size = info->u.vesa_lfb.red_size;
0052         screen_info->red_pos = info->u.vesa_lfb.red_pos;
0053         screen_info->green_size = info->u.vesa_lfb.green_size;
0054         screen_info->green_pos = info->u.vesa_lfb.green_pos;
0055         screen_info->blue_size = info->u.vesa_lfb.blue_size;
0056         screen_info->blue_pos = info->u.vesa_lfb.blue_pos;
0057         screen_info->rsvd_size = info->u.vesa_lfb.rsvd_size;
0058         screen_info->rsvd_pos = info->u.vesa_lfb.rsvd_pos;
0059
0060         if (size >= offsetof(struct dom0_vga_console_info,
0061                      u.vesa_lfb.ext_lfb_base)
0062             + sizeof(info->u.vesa_lfb.ext_lfb_base)
0063             && info->u.vesa_lfb.ext_lfb_base) {
0064             screen_info->ext_lfb_base = info->u.vesa_lfb.ext_lfb_base;
0065             screen_info->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
0066         }
0067
0068         if (info->video_type == XEN_VGATYPE_EFI_LFB) {
0069             screen_info->orig_video_isVGA = VIDEO_TYPE_EFI;
0070             break;
0071         }
0072
0073         if (size >= offsetof(struct dom0_vga_console_info,
0074                      u.vesa_lfb.mode_attrs)
0075             + sizeof(info->u.vesa_lfb.mode_attrs))
0076             screen_info->vesa_attributes = info->u.vesa_lfb.mode_attrs;
0077         break;
0078     }
0079 }