/*******************************************************************************/
/* COS2000 - Compatible Operating System - LGPL v3 - Hordé Nicolas             */
/*                                                                             */
#include "types.h"
#include "video.h"

#define TEXTSCREEN 0xB8000	/* debut de la memoire video texte */
#define GRPHSCREEN 0xA0000	/* debut de la memoire video graphique */
#define ENDOFVMEM  0xC0000

/* Registres VGAs */

#define SEQUENCER   0x3c4
#define MISC_WRITE  0x3c2
#define MISC_READ   0x3cc
#define CCRT        0x3D4
#define ATTRIBS     0x3c0
#define GRAPHICS    0x3ce
#define STATE       0x3da

/* Taille d'un plan de bit */

#define PLANESIZE 0x10000

/* Registres VGA */
typedef struct misc_regs
{
	u8      Miscellaneous_Output_Register;
} misc_regs __attribute__ ((packed));

typedef struct sequencer_regs
{
	u8      Reset_Register;
	u8      Clocking_Mode_Register;
	u8      Map_Mask_Register;
	u8      Character_Map_Select_Register;
	u8      Sequencer_Memory_Mode_Register;
} sequencer_regs __attribute__ ((packed));

typedef struct crtc_regs
{
	u8      Horizontal_Total_Register;
	u8      End_Horizontal_Display_Register;
	u8      Start_Horizontal_Blanking_Register;
	u8      End_Horizontal_Blanking_Register;
	u8      Start_Horizontal_Retrace_Register;
	u8      End_Horizontal_Retrace_Register;
	u8      Vertical_Total_Register;
	u8      Overflow_Register;
	u8      Preset_Row_Scan_Register;
	u8      Maximum_Scan_Line_Register;
	u8      Cursor_Start_Register;
	u8      Cursor_End_Register;
	u8      Start_Address_High_Register;
	u8      Start_Address_Low_Register;
	u8      Cursor_Location_High_Register;
	u8      Cursor_Location_Low_Register;
	u8      Vertical_Retrace_Start_Register;
	u8      Vertical_Retrace_End_Register;
	u8      Vertical_Display_End_Register;
	u8      Offset_Register;
	u8      Underline_Location_Register;
	u8      Start_Vertical_Blanking_Register;
	u8      End_Vertical_Blanking;
	u8      CRTC_Mode_Control_Register;
	u8      Line_Compare_Register;
} crtc_regs __attribute__ ((packed));

typedef struct graphics_regs
{
	u8      Set_Reset_Register;
	u8      Enable_Set_Reset_Register;
	u8      Color_Compare_Register;
	u8      Data_Rotate_Register;
	u8      Read_Map_Select_Register;
	u8      Graphics_Mode_Register;
	u8      Miscellaneous_Graphics_Register;
	u8      Color_Dont_Care_Register;
	u8      Bit_Mask_Register;
} graphics_regs __attribute__ ((packed));

typedef struct attributs_regs
{
	u8      Palette_Registers[16];
	u8      Attribute_Mode_Control_Register;
	u8      Overscan_Color_Register;
	u8      Color_Plane_Enable_Register;
	u8      Horizontal_Pixel_Panning_Register;
	u8      Color_Select_Register;
} attributs_regs __attribute__ ((packed));

typedef struct vgamode
{
	misc_regs misc;
	sequencer_regs sequencer;
	crtc_regs ctrc;
	graphics_regs graphic;
	attributs_regs attribut;
} vgamode __attribute__ ((packed));

/* fonction obligatoires */
void    VGA_remap_memory(u32 vaddr);
u8     *VGA_detect_hardware(void);
u8      VGA_setvideo_mode(u8 mode);
u8     *VGA_getvideo_drivername(void);
u8     *VGA_getvideo_capabilities(void);
videoinfos *VGA_getvideo_info(void);
u32     VGA_mem_to_video(void *src, u32 dst, u32 size, bool increment_src);
u32     VGA_video_to_mem(u32 src, void *dst, u32 size);
u32     VGA_video_to_video(u32 src, u32 dst, u32 size);
void    VGA_wait_vretrace(void);
void    VGA_wait_hretrace(void);
void    VGA_page_set(u8 page);
void    VGA_page_show(u8 page);
void    VGA_page_split(u16 y);
void    VGA_cursor_enable(void);
void    VGA_cursor_disable(void);
void    VGA_cursor_set(u16 x, u16 y);
u32     VGA_font_load(u8 * def, u8 size, u8 font);
void    VGA_font1_set(u8 num);
void    VGA_font2_set(u8 num);
void    VGA_blink_enable(void);
void    VGA_blink_disable(void);

static videofonction vgafonctions = {
	&VGA_remap_memory,
	&VGA_detect_hardware,
	&VGA_setvideo_mode,
	&VGA_getvideo_drivername,
	&VGA_getvideo_capabilities,
	&VGA_getvideo_info,
	&VGA_mem_to_video,
	&VGA_video_to_mem,
	&VGA_video_to_video,
	&VGA_wait_vretrace,
	&VGA_wait_hretrace,
	&VGA_page_set,
	&VGA_page_show,
	&VGA_page_split,
	&VGA_cursor_enable,
	&VGA_cursor_disable,
	&VGA_cursor_set,
	&VGA_font_load,
	&VGA_font1_set,
	&VGA_font2_set,
	&VGA_blink_enable,
	&VGA_blink_disable
};