#ifndef MULTIBOOT_HEADER
#define MULTIBOOT_HEADER 1

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

/* the magic field should contain this. */
#define MULTIBOOT_HEADER_MAGIC                  0x1badb002

/* this should be in eax */
#define MULTIBOOT_BOOTLOADER_MAGIC              0x2badb002

/* bits in the required part of flags field we don't support */
#define MULTIBOOT_UNSUPPORTED                   0x0000fffc

/* alignment of multiboot modules */
#define MULTIBOOT_MOD_ALIGN                     0x00001000

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

/*
 * multiboot header flags
 */

/* align each boot module on 4KB page boundary */
#define MULTIBOOT_PAGE_ALIGN                    0x00000001

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

/* 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

/* 
 * multiboot info flags
 */

/* has basic memory information */
#define MULTIBOOT_INFO_MEMORY                   0x00000001

/* has boot device */
#define MULTIBOOT_INFO_BOOTDEV                  0x00000002

/* has command-line */
#define MULTIBOOT_INFO_CMDLINE                  0x00000004

/* has modules */
#define MULTIBOOT_INFO_MODS                     0x00000008


/* only one of the next two should be set */
/* has a.out symbol table */
#define MULTIBOOT_INFO_AOUT_SYMS                0x00000010
/* has ELF section header table */
#define MULTIBOOT_INFO_ELF_SHDR                 0X00000020

/* has complete memory map */
#define MULTIBOOT_INFO_MEM_MAP                  0x00000040

/* has drive info */
#define MULTIBOOT_INFO_DRIVE_INFO               0x00000080

/* has config table */
#define MULTIBOOT_INFO_CONFIG_TABLE             0x00000100

/* has boot loader name */
#define MULTIBOOT_INFO_BOOT_LOADER_NAME         0x00000200

/* has APM table */
#define MULTIBOOT_INFO_APM_TABLE                0x00000400

/* has video information */
#define MULTIBOOT_INFO_VIDEO_INFO               0x00000800

#include <stdint.h>

struct multiboot_header {
	uint32_t magic; /* should == MULTIBOOT_MAGIC */

	uint32_t flags;

	uint32_t checksum; /* magic + flags + checksum & 0xffffffff == 0 */

	/* only valid if MULTIBOOT_AOUT_KLUDGE is set */
	uint32_t header_addr;
	uint32_t load_addr;
	uint32_t load_end_addr;
	uint32_t bss_end_addr;
	uint32_t entry_addr;

	/* only valid if MULTIBOOT_VIDEO_MODE is set */
	uint32_t mode_type;
	uint32_t width;
	uint32_t height;
	uint32_t depth;
};

/* a.out symbol table */
struct multiboot_aout_symbol_table {
	uint32_t tabsize;
	uint32_t strsize;
	uint32_t addr;
	uint32_t reserved;
};

/* ELF section header table */
struct multiboot_elf_section_header_table {
	uint32_t num;
	uint32_t size;
	uint32_t addr;
	uint32_t shndx;
};

struct multiboot_info {
	uint32_t flags;

	/* available memory from BIOS */
	uint32_t mem_lower;
	uint32_t mem_upper;

	uint32_t boot_device; /* root partition */

	uint32_t cmdline; /* kernel command line */

	uint32_t mods_count; /* number of mods */
	uint32_t mods_addr; /* physical address of list */

	union {
		struct multiboot_aout_symbol_table aout_sym;
		struct multiboot_elf_section_header_table elf_sec;
	} u;

	/* memory map */
	uint32_t mmap_length;
	uint32_t mmap_addr;

	/* drive info */
	uint32_t drives_length;
	uint32_t drives_addr;

	/* ROM configuration table */
	uint32_t config_table;

	/* boot loader Name */
	uint32_t boot_loader_name;

	/* APM table */
	uint32_t apm_table;

	/* video information */
	uint32_t vbe_control_info;
	uint32_t vbe_mode_info;
	uint16_t vbe_mode;
	uint16_t vbe_interface_seg;
	uint16_t vbe_interface_off;
	uint16_t vbe_interface_len;
};

#define MULTIBOOT_MEMORY_AVAILABLE              1
#define MULTIBOOT_MEMORY_RESERVED               2
struct multiboot_mmap_entry {
	uint32_t size;
	uint64_t addr;
	uint64_t len;
	uint32_t type;
} __attribute__((packed));

struct multiboot_mod_list {
	/* memory used goes from mod_start through mod_end-1 */
	uint32_t mod_start;
	uint32_t mod_end;

	uint32_t cmdline;

	uint32_t padding; /* each entry is 16 bytes */
};

#endif