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#ifndef MELVIX_VESA_H
#define MELVIX_VESA_H
#include <stdint.h>
#include "../system.h"
int vesa_available;
struct edid_data {
uint8_t padding[8];
uint16_t manufacture_id;
uint16_t product_code;
uint32_t serial_number;
uint8_t manufacture_week;
uint8_t manufacture_year;
uint8_t edid_version;
uint8_t edid_revision;
uint8_t video_input_type;
uint8_t max_horizontal_size;
uint8_t max_vertical_size;
uint8_t gamma_factor;
uint8_t dpms_flags;
uint8_t chroma_information[10];
uint8_t timings_1;
uint8_t timings_2;
uint8_t reserved_timings;
uint32_t timing_identification[8];
uint8_t timing_description_1[18];
uint8_t timing_description_2[18];
uint8_t timing_description_3[18];
uint8_t timing_description_4[18];
uint8_t unused;
uint8_t checksum;
};
/**
* The CPUs response to the 0x4F00 call
* Used to receive the supported video modes
*/
struct vbe_info {
char signature[4];
uint32_t version;
struct far_ptr oem;
uint32_t capabilities;
struct far_ptr video_modes;
uint32_t video_memory;
uint32_t software_rev;
uint32_t vendor;
uint32_t product_name;
uint32_t product_rev;
char reserved[222];
char oem_data[256];
} __attribute__ ((packed));
/**
* The CPUs response to the 0x4F01 call
* Used to get information about a specific video mode code
*/
struct vbe_mode_info_all {
uint16_t attributes;
uint8_t window_a;
uint8_t window_b;
uint16_t granularity;
uint16_t window_size;
uint16_t segment_a;
uint16_t segment_b;
uint32_t win_func_ptr;
uint16_t pitch;
uint16_t width;
uint16_t height;
uint8_t w_char;
uint8_t y_char;
uint8_t planes;
uint8_t bpp;
uint8_t banks;
uint8_t memory_model;
uint8_t bank_size;
uint8_t image_pages;
uint8_t reserved0;
uint8_t red_mask;
uint8_t red_position;
uint8_t green_mask;
uint8_t green_position;
uint8_t blue_mask;
uint8_t blue_position;
uint8_t reserved_mask;
uint8_t reserved_position;
uint8_t direct_color_attributes;
uint32_t framebuffer;
uint32_t off_screen_mem_off;
uint16_t off_screen_mem_size;
uint8_t reserved1[206];
} __attribute__ ((packed));
/**
* The actual vbe mode info structure
*/
struct vbe_mode_info {
uint16_t attributes;
uint16_t width;
uint16_t height;
uint8_t bpp;
uint32_t framebuffer;
} __attribute__ ((packed));
/**
* Get the monitors EDID information
* TODO: Add EDID/VBE resolution mode verification
* @return The EDID information
*/
struct edid_data get_edid();
/**
* Forces switch to VGA, displays an error and halts the CPU
*/
void switch_to_vga();
/**
* Set the video mode to a specified resolution using
* a video mode code
* @param mode The requested video mode code from 0x4F00 call
*/
void vbe_set_mode(unsigned short mode);
/**
* Find the highest resolution using 0x4F00 and call
* vbe_set_mode using the video_modes far_ptr
*/
void set_optimal_resolution();
/**
* Draw a string in VESA mode
* @param ch
*/
void vesa_draw_string(char *data);
/**
* The current video mode
*/
int vbe_current_mode;
/**
* The width of the current video mode
*/
int vbe_width;
/**
* The height of the current video mode
*/
int vbe_height;
/**
* The bytes per pixel (pixel width) of the current video mode
*/
int vbe_bpp;
/**
* The framebuffer interface
*/
uint32_t fb;
#endif
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