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Add support for Vesa BIOS extensions 

For option ROMs we can use these extensions to request a particular video
mode. Add a header file which defines the binary interface.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2014-11-14 20:56:31 -07:00
parent 22465fc46c
commit 647f56e74e
1 changed files with 103 additions and 0 deletions
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include/vbe.h Normal file
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/******************************************************************************
* Copyright (c) 2004, 2008 IBM Corporation
* Copyright (c) 2009 Pattrick Hueper <phueper@hueper.net>
* All rights reserved.
*
* SPDX-License-Identifier: BSD-2-Clause
*
* Contributors:
* IBM Corporation - initial implementation
*****************************************************************************/
#ifndef _VBE_H
#define _VBE_H
/* these structs are for input from and output to OF */
struct __packed screen_info {
u8 display_type; /* 0=NONE, 1= analog, 2=digital */
u16 screen_width;
u16 screen_height;
/* bytes per line in framebuffer, may be more than screen_width */
u16 screen_linebytes;
u8 color_depth; /* color depth in bits per pixel */
u32 framebuffer_address;
u8 edid_block_zero[128];
};
struct __packed screen_info_input {
u8 signature[4];
u16 size_reserved;
u8 monitor_number;
u16 max_screen_width;
u8 color_depth;
};
/* these structs only store the required a subset of the VBE-defined fields */
struct __packed vbe_info {
char signature[4];
u16 version;
u8 *oem_string_ptr;
u32 capabilities;
u16 video_mode_list[256];
u16 total_memory;
};
struct __packed vesa_mode_info {
u16 mode_attributes; /* 00 */
u8 win_a_attributes; /* 02 */
u8 win_b_attributes; /* 03 */
u16 win_granularity; /* 04 */
u16 win_size; /* 06 */
u16 win_a_segment; /* 08 */
u16 win_b_segment; /* 0a */
u32 win_func_ptr; /* 0c */
u16 bytes_per_scanline; /* 10 */
u16 x_resolution; /* 12 */
u16 y_resolution; /* 14 */
u8 x_charsize; /* 16 */
u8 y_charsize; /* 17 */
u8 number_of_planes; /* 18 */
u8 bits_per_pixel; /* 19 */
u8 number_of_banks; /* 20 */
u8 memory_model; /* 21 */
u8 bank_size; /* 22 */
u8 number_of_image_pages; /* 23 */
u8 reserved_page;
u8 red_mask_size;
u8 red_mask_pos;
u8 green_mask_size;
u8 green_mask_pos;
u8 blue_mask_size;
u8 blue_mask_pos;
u8 reserved_mask_size;
u8 reserved_mask_pos;
u8 direct_color_mode_info;
u32 phys_base_ptr;
u32 offscreen_mem_offset;
u16 offscreen_mem_size;
u8 reserved[206];
};
struct vbe_mode_info {
u16 video_mode;
bool valid;
union {
struct vesa_mode_info vesa;
u8 mode_info_block[256];
};
};
struct vbe_ddc_info {
u8 port_number; /* i.e. monitor number */
u8 edid_transfer_time;
u8 ddc_level;
u8 edid_block_zero[128];
};
#define VESA_GET_INFO 0x4f00
#define VESA_GET_MODE_INFO 0x4f01
#define VESA_SET_MODE 0x4f02
struct graphic_device;
int vbe_get_video_info(struct graphic_device *gdev);
#endif