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//
// vga.h
//
// VESA BIOS Extension definitions
//
// Copyright (C) 2015 Michael Ringgaard. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. Neither the name of the project nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
// SUCH DAMAGE.
//
#ifndef VGA_H
#define VGA_H
#define VESA_ADDR(ptr) (((ptr) & 0xFFFF) | ((ptr) >> 12))
#pragma pack(push, 1)
// VGA driver ioctl codes
#define IOCTL_VGA_GET_VIDEO_MODE 1024
#define IOCTL_VGA_GET_FRAME_BUFFER 1025
// VESA BIOS extension information
struct vesa_info {
unsigned char vesa_signature[4];
unsigned short vesa_version;
unsigned long oem_string_ptr;
unsigned char capabilities[4];
unsigned long video_mode_ptr;
unsigned short total_memory;
unsigned short oem_software_rev;
unsigned long oem_vendor_name_ptr;
unsigned long oem_product_name_ptr;
unsigned long oem_product_rev_ptr;
unsigned char reserved[222];
unsigned char oem_data[256];
};
// VESA mode information
struct vesa_mode_info {
unsigned short attributes;
unsigned char wina_attributes;
unsigned char winb_attributes;
unsigned short win_granularity;
unsigned short win_size;
unsigned short wina_segment;
unsigned short winb_segment;
unsigned long win_func_ptr;
unsigned short bytes_per_scanline;
unsigned short x_resolution;
unsigned short y_resolution;
unsigned char x_char_size;
unsigned char y_char_size;
unsigned char number_of_planes;
unsigned char bits_per_pixel;
unsigned char number_of_banks;
unsigned char memory_model;
unsigned char bank_size;
unsigned char number_of_image_pages;
unsigned char reserved_page;
unsigned char red_mask_size;
unsigned char red_mask_pos;
unsigned char green_mask_size;
unsigned char green_mask_pos;
unsigned char blue_mask_size;
unsigned char blue_mask_pos;
unsigned char reserved_mask_size;
unsigned char reserved_mask_pos;
unsigned char direct_color_mode_info;
unsigned long phys_base_ptr;
unsigned long off_screen_mem_offset;
unsigned short off_screen_mem_size;
unsigned char reserved[206];
};
#pragma pack(pop)
#endif