#ifndef __HOS_MULTIBOOT_H__
#define __HOS_MULTIBOOT_H__ __HOS_MULTIBOOT_H__

#include "hos_defines.h"

/* The magic number for the Multiboot header. */
#define MULTIBOOT_HEADER_MAGIC          0x1BADB002

#define MB_HEADER_ALIGN_MODULES 0x01
#define MB_HEADER_MEM_INFO 0x02
#define MB_HEADER_VIDEO_INFO 0x04
#define MB_HEADER_KLUDGE_OFFSETS 0x10000

/* The magic number passed by a Multiboot-compliant boot loader. */
#define MULTIBOOT_BOOTLOADER_MAGIC      0x2BADB002

#define MB_BOOTLOADER_MEM_INFO 0x01
#define MB_BOOTLOADER_BOOT_DEVICE 0x02
#define MB_BOOTLOADER_COMMAND_LINE 0x04
#define MB_BOOTLOADER_MODS 0x08
#define MB_BOOTLOADER_AOUT 0x10
#define MB_BOOTLOADER_ELF 0x20
#define MB_BOOTLOADER_MMAP 0x40
#define MB_BOOTLOADER_DRIVES 0x80
#define MB_BOOTLOADER_CONFIG 0x0100
#define MB_BOOTLOADER_APM 0x0200
#define MB_BOOTLOADER_GRAPHICS 0x0400

#define MB_DRIVE_MODE_CHS 0
#define MB_DRIVE_MODE_LBA 1

/* The Multiboot header. */
typedef struct
{
	unsigned int magic;
	unsigned int flags;
	unsigned int checksum;
	unsigned int header_addr;
	unsigned int load_addr;
	unsigned int load_end_addr;
	unsigned int bss_end_addr;
	unsigned int entry_addr;
} mb_header_t;

/* The symbol table for a.out. */
typedef struct
{
	unsigned int tabsize;
	unsigned int strsize;
	unsigned int addr;
	unsigned int reserved;
} mb_aout_symbol_table_t;

/* The section header table for ELF. */
typedef struct
{
	unsigned int num;
	unsigned int size;
	unsigned int addr;
	unsigned int shndx;
} mb_elf_section_header_table_t;

/* The Multiboot information. */
typedef struct
{
	unsigned int flags;
	unsigned int mem_lower;		// present if flags[0] is set
	unsigned int mem_upper;
	unsigned int boot_device;	// 1
	unsigned int cmdline;		// 2
	unsigned int mods_count;	// 3
	unsigned int mods_addr;
	union
	{
		mb_aout_symbol_table_t aout_sym;	// 4
		mb_elf_section_header_table_t elf_sec;	// 5
	};
	unsigned int mmap_length;	// 6
	unsigned int mmap_addr;
	unsigned int drives_length;	// 7
	unsigned int drives_addr;
	unsigned int config_table;	// 8
	unsigned int bootloader_name;	// 9
	unsigned int apm_table;		// 10

	unsigned int vbe_control_info;	// 11
	unsigned int vbe_mode_info;
	unsigned short vbe_mode;
	unsigned short vbe_interface_seg;
	unsigned short vbe_interface_off;
	unsigned short vbe_interface_len;
} mb_info_t;

/* The module structure. */
typedef struct
{
	unsigned int mod_start;
	unsigned int mod_end;
	unsigned int string;
	unsigned int reserved;
} mb_module_t;

/* The memory map. Be careful that the offset 0 is base_addr_low, not size. */
typedef struct
{
	unsigned int size;		//offset -4
//	unsigned int base_addr_low;	//offset 0
//	unsigned int base_addr_high;
//	unsigned int length_low;
//	unsigned int length_high;
	u64_t base;
	u64_t length;
	unsigned int type;
} mb_mmap_t;

/* The drive structure */
typedef struct
{
	unsigned int size;
	unsigned char drive_number;
	unsigned char drive_mode;
	unsigned char drive_cylinders;
	unsigned char drive_heads;
	unsigned char drive_sectors;
	unsigned short drive_ports[1];
} mb_drive_t;

/* APM table structure */
typedef struct
{
	unsigned short version;
	unsigned short cseg;
	unsigned int offset;
	unsigned short cseg_16;
	unsigned short dseg;
	unsigned short flags;
	unsigned short cseg_len;
	unsigned short cseg_16_len;
	unsigned short dseg_len;
} mb_apm_t;


#endif