//----------------------------------------------------------------------------//
//                                OS on Kaleid                                //
//                                                                            //
//  Desc:   multiboot.h - Multiboot header file.                              //
//                                                                            //
//                                                                            //
//  Copyright © 1999,2003,2007-2010  Free Software Foundation, Inc.           //
//  Copyright © 2018-2020 The OS/K Team                                       //
//                                                                            //
//  This file is part of OS/K.                                                //
//                                                                            //
//  OS/K is free software: you can redistribute it and/or modify              //
//  it under the terms of the GNU General Public License as published by      //
//  the Free Software Foundation, either version 3 of the License, or         //
//  any later version.                                                        //
//                                                                            //
//  OS/K is distributed in the hope that it will be useful,                   //
//  but WITHOUT ANY WARRANTY//without even the implied warranty of            //
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             //
//  GNU General Public License for more details.                              //
//                                                                            //
//  You should have received a copy of the GNU General Public License         //
//  along with OS/K.  If not, see <https://www.gnu.org/licenses/>.            //
//----------------------------------------------------------------------------//

#ifndef _KERNEL_H
#include <kernel.h>
#endif

#ifndef MULTIBOOT_HEADER
#define MULTIBOOT_HEADER 1

/* How many bytes from the start of the file we search for the header.  */
#define MULTIBOOT_SEARCH                    8192
#define MULTIBOOT_HEADER_ALIGN              4

/* The magic field should contain this.  */
#define MULTIBOOT_HEADER_MAGIC              0x1BADB002

/* This should be in %eax.  */
#define MULTIBOOT_BOOTLOADER_MAGIC          0x2BADB002

/* Alignment of multiboot modules.  */
#define MULTIBOOT_MOD_ALIGN                 0x00001000

/* Alignment of the multiboot info structure.  */
#define MULTIBOOT_INFO_ALIGN                0x00000004

/* Flags set in the 'flags' member of the multiboot header.  */

/* Align all boot modules on i386 page (4KB) boundaries.  */
#define MULTIBOOT_PAGE_ALIGN                0x00000001

/* Must pass memory information to OS.  */
#define MULTIBOOT_MEMORY_INFO               0x00000002

/* Must pass video information to OS.  */
#define MULTIBOOT_VIDEO_MODE                0x00000004

/* This flag indicates the use of the address fields in the header.  */
#define MULTIBOOT_AOUT_KLUDGE               0x00010000


#define MULTIBOOT_INFO_MEMORY               0x00000001
/* is there a boot device set? */
#define MULTIBOOT_INFO_BOOTDEV              0x00000002
/* is the command-line defined? */
#define MULTIBOOT_INFO_CMDLINE              0x00000004
/* are there modules to do something with? */
#define MULTIBOOT_INFO_MODS                 0x00000008

/* These next two are mutually exclusive */

/* is there a symbol table loaded? */
#define MULTIBOOT_INFO_AOUT_SYMS            0x00000010
/* is there an ELF section header table? */
#define MULTIBOOT_INFO_ELF_SHDR             0x00000020

/* is there a full memory map? */
#define MULTIBOOT_INFO_MEM_MAP              0x00000040

/* Is there drive info?  */
#define MULTIBOOT_INFO_DRIVE_INFO           0x00000080

/* Is there a config table?  */
#define MULTIBOOT_INFO_CONFIG_TABLE         0x00000100

/* Is there a boot loader name?  */
#define MULTIBOOT_INFO_BOOT_LOADER_NAME     0x00000200

/* Is there a APM table?  */
#define MULTIBOOT_INFO_APM_TABLE            0x00000400

/* Is there video information?  */
#define MULTIBOOT_INFO_VBE_INFO             0x00000800
#define MULTIBOOT_INFO_FRAMEBUFFER_INFO     0x00001000

#ifndef ASM_FILE

typedef unsigned char uchar;
typedef unsigned short ushort;
typedef unsigned int uint;
typedef unsigned long ulong;

struct multiboot_header
{
  /* Must be MULTIBOOT_MAGIC - see above.  */
  uint magic;

  /* Feature flags.  */
  uint flags;

  /* The above fields plus this one must equal 0 mod 2^32. */
  uint checksum;

  /* These are only valid if MULTIBOOT_AOUT_KLUDGE is set.  */
  uint header_addr;
  uint load_addr;
  uint load_end_addr;
  uint bss_end_addr;
  uint entry_addr;

  /* These are only valid if MULTIBOOT_VIDEO_MODE is set.  */
  uint mode_type;
  uint width;
  uint height;
  uint depth;
};

/* The symbol table for a.out.  */
struct multiboot_aout_symbol_table
{
  uint tabsize;
  uint strsize;
  uint addr;
  uint reserved;
};
typedef struct multiboot_aout_symbol_table multiboot_aout_symbol_table_t;

/* The section header table for ELF.  */
struct multiboot_elf_section_header_table
{
  uint num;
  uint size;
  uint addr;
  uint shndx;
};
typedef struct multiboot_elf_section_header_table
                        multiboot_elf_section_header_table_t;

struct multiboot_info
{
  /* Multiboot info version number */
  uint flags;

  /* Available memory from BIOS */
  uint mem_lower;
  uint mem_upper;

  /* "root" partition */
  uint boot_device;

  /* Kernel command line */
  uint cmdline;

  /* Boot-Module list */
  uint mods_count;
  uint mods_addr;

  union
  {
    multiboot_aout_symbol_table_t aout_sym;
    multiboot_elf_section_header_table_t elf_sec;
  } u;

  /* Memory Mapping buffer */
  uint mmap_length;
  uint mmap_addr;

  /* Drive Info buffer */
  uint drives_length;
  uint drives_addr;

  /* ROM configuration table */
  uint config_table;

  /* Boot Loader Name */
  uint boot_loader_name;

  /* APM table */
  uint apm_table;

  /* Video */
  uint vbe_control_info;
  uint vbe_mode_info;
  ushort vbe_mode;
  ushort vbe_interface_seg;
  ushort vbe_interface_off;
  ushort vbe_interface_len;

  ulong framebuffer_addr;
  uint framebuffer_pitch;
  uint framebuffer_width;
  uint framebuffer_height;
  uchar framebuffer_bpp;
#define MULTIBOOT_FRAMEBUFFER_TYPE_INDEXED 0
#define MULTIBOOT_FRAMEBUFFER_TYPE_RGB     1
#define MULTIBOOT_FRAMEBUFFER_TYPE_EGA_TEXT    2
  uchar framebuffer_type;
  union
  {
    struct
    {
      uint framebuffer_palette_addr;
      ushort framebuffer_palette_num_colors;
    };
    struct
    {
      uchar framebuffer_red_field_position;
      uchar framebuffer_red_mask_size;
      uchar framebuffer_green_field_position;
      uchar framebuffer_green_mask_size;
      uchar framebuffer_blue_field_position;
      uchar framebuffer_blue_mask_size;
    };
  };
};
typedef struct multiboot_info multiboot_info_t;

struct multiboot_color
{
  uchar red;
  uchar green;
  uchar blue;
};

struct multiboot_mmap_entry
{
  uint size;
  uint addr_low;
  uint addr_high;
  uint len_low;
  uint len_high;
  uint type;
} __attribute__((packed)) __attribute__((aligned (4)));
typedef struct multiboot_mmap_entry multiboot_memory_map_t;

struct multiboot_mod_list
{
  /* the memory used goes from bytes 'mod_start' to 'mod_end-1' inclusive */
  uint mod_start;
  uint mod_end;

  /* Module command line */
  uint cmdline;

  /* padding to take it to 16 bytes (must be zero) */
  uint pad;
};
typedef struct multiboot_mod_list multiboot_module_t;

/* APM BIOS info.  */
struct multiboot_apm_info
{
  ushort version;
  ushort cseg;
  uint offset;
  ushort cseg_16;
  ushort dseg;
  ushort flags;
  ushort cseg_len;
  ushort cseg_16_len;
  ushort dseg_len;
};

#endif /* ! ASM_FILE */

#endif /* ! MULTIBOOT_HEADER */