vga.c

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#include <linux/screen_info.h>
#include <linux/init.h>

#include <asm/bootparam.h>
#include <asm/setup.h>

#include <xen/interface/xen.h>

#include "xen-ops.h"

void __init xen_init_vga(const struct dom0_vga_console_info *info, size_t size)
{
    struct screen_info *screen_info = &boot_params.screen_info;

    /* This is drawn from a dump from vgacon:startup in
     * standard Linux. */
    screen_info->orig_video_mode = 3;
    screen_info->orig_video_isVGA = 1;
    screen_info->orig_video_lines = 25;
    screen_info->orig_video_cols = 80;
    screen_info->orig_video_ega_bx = 3;
    screen_info->orig_video_points = 16;
    screen_info->orig_y = screen_info->orig_video_lines - 1;

    switch (info->video_type) {
    case XEN_VGATYPE_TEXT_MODE_3:
        if (size < offsetof(struct dom0_vga_console_info, u.text_mode_3)
            + sizeof(info->u.text_mode_3))
            break;
        screen_info->orig_video_lines = info->u.text_mode_3.rows;
        screen_info->orig_video_cols = info->u.text_mode_3.columns;
        screen_info->orig_x = info->u.text_mode_3.cursor_x;
        screen_info->orig_y = info->u.text_mode_3.cursor_y;
        screen_info->orig_video_points =
            info->u.text_mode_3.font_height;
        break;

    case XEN_VGATYPE_EFI_LFB:
    case XEN_VGATYPE_VESA_LFB:
        if (size < offsetof(struct dom0_vga_console_info,
                    u.vesa_lfb.gbl_caps))
            break;
        screen_info->orig_video_isVGA = VIDEO_TYPE_VLFB;
        screen_info->lfb_width = info->u.vesa_lfb.width;
        screen_info->lfb_height = info->u.vesa_lfb.height;
        screen_info->lfb_depth = info->u.vesa_lfb.bits_per_pixel;
        screen_info->lfb_base = info->u.vesa_lfb.lfb_base;
        screen_info->lfb_size = info->u.vesa_lfb.lfb_size;
        screen_info->lfb_linelength = info->u.vesa_lfb.bytes_per_line;
        screen_info->red_size = info->u.vesa_lfb.red_size;
        screen_info->red_pos = info->u.vesa_lfb.red_pos;
        screen_info->green_size = info->u.vesa_lfb.green_size;
        screen_info->green_pos = info->u.vesa_lfb.green_pos;
        screen_info->blue_size = info->u.vesa_lfb.blue_size;
        screen_info->blue_pos = info->u.vesa_lfb.blue_pos;
        screen_info->rsvd_size = info->u.vesa_lfb.rsvd_size;
        screen_info->rsvd_pos = info->u.vesa_lfb.rsvd_pos;

        if (info->video_type == XEN_VGATYPE_EFI_LFB) {
            screen_info->orig_video_isVGA = VIDEO_TYPE_EFI;
            break;
        }

        if (size >= offsetof(struct dom0_vga_console_info,
                     u.vesa_lfb.gbl_caps)
            + sizeof(info->u.vesa_lfb.gbl_caps))
            screen_info->capabilities = info->u.vesa_lfb.gbl_caps;
        if (size >= offsetof(struct dom0_vga_console_info,
                     u.vesa_lfb.mode_attrs)
            + sizeof(info->u.vesa_lfb.mode_attrs))
            screen_info->vesa_attributes = info->u.vesa_lfb.mode_attrs;
        break;
    }
}