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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/x86/xen/vga.c
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// SPDX-License-Identifier: GPL-2.0

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#include <linux/screen_info.h>

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#include <linux/init.h>

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#include <asm/setup.h>

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#include <xen/interface/xen.h>

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#include "xen-ops.h"

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void __init xen_init_vga(const struct dom0_vga_console_info *info, size_t size,

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			 struct screen_info *screen_info)

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{

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	/* This is drawn from a dump from vgacon:startup in

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	 * standard Linux. */

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	screen_info->orig_video_mode = 3;

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	screen_info->orig_video_isVGA = 1;

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	screen_info->orig_video_lines = 25;

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	screen_info->orig_video_cols = 80;

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	screen_info->orig_video_ega_bx = 3;

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	screen_info->orig_video_points = 16;

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	screen_info->orig_y = screen_info->orig_video_lines - 1;

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	switch (info->video_type) {

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	case XEN_VGATYPE_TEXT_MODE_3:

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		if (size < offsetof(struct dom0_vga_console_info, u.text_mode_3)

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		    + sizeof(info->u.text_mode_3))

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			break;

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		screen_info->orig_video_lines = info->u.text_mode_3.rows;

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		screen_info->orig_video_cols = info->u.text_mode_3.columns;

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		screen_info->orig_x = info->u.text_mode_3.cursor_x;

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		screen_info->orig_y = info->u.text_mode_3.cursor_y;

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		screen_info->orig_video_points =

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			info->u.text_mode_3.font_height;

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		break;

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	case XEN_VGATYPE_EFI_LFB:

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	case XEN_VGATYPE_VESA_LFB:

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		if (size < offsetof(struct dom0_vga_console_info,

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				    u.vesa_lfb.gbl_caps))

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			break;

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		screen_info->orig_video_isVGA = VIDEO_TYPE_VLFB;

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		screen_info->lfb_width = info->u.vesa_lfb.width;

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		screen_info->lfb_height = info->u.vesa_lfb.height;

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		screen_info->lfb_depth = info->u.vesa_lfb.bits_per_pixel;

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		screen_info->lfb_base = info->u.vesa_lfb.lfb_base;

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		screen_info->lfb_size = info->u.vesa_lfb.lfb_size;

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		screen_info->lfb_linelength = info->u.vesa_lfb.bytes_per_line;

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		screen_info->red_size = info->u.vesa_lfb.red_size;

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		screen_info->red_pos = info->u.vesa_lfb.red_pos;

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		screen_info->green_size = info->u.vesa_lfb.green_size;

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		screen_info->green_pos = info->u.vesa_lfb.green_pos;

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		screen_info->blue_size = info->u.vesa_lfb.blue_size;

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		screen_info->blue_pos = info->u.vesa_lfb.blue_pos;

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		screen_info->rsvd_size = info->u.vesa_lfb.rsvd_size;

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		screen_info->rsvd_pos = info->u.vesa_lfb.rsvd_pos;

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		if (size >= offsetof(struct dom0_vga_console_info,

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				     u.vesa_lfb.ext_lfb_base)

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		    + sizeof(info->u.vesa_lfb.ext_lfb_base)

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		    && info->u.vesa_lfb.ext_lfb_base) {

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			screen_info->ext_lfb_base = info->u.vesa_lfb.ext_lfb_base;

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			screen_info->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;

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		}

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		if (info->video_type == XEN_VGATYPE_EFI_LFB) {

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			screen_info->orig_video_isVGA = VIDEO_TYPE_EFI;

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			break;

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		}

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		if (size >= offsetof(struct dom0_vga_console_info,

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				     u.vesa_lfb.mode_attrs)

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		    + sizeof(info->u.vesa_lfb.mode_attrs))

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			screen_info->vesa_attributes = info->u.vesa_lfb.mode_attrs;

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		break;

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	}

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}

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