/* multiboot.h - definitions for the multiboot header */

struct mbootinfo {
        uint32  flags;                  /* Multiboot information flags  */
        uint32  mem_lower;              /* Memory in KB below 1M        */
        uint32  mem_upper;              /* Memory in KB above 1M        */
        uint32  boot_device;            /* Boot device containing image */
        uint32  cmdline;                /* Address of command line      */
        uint32  mods_count;             /* No. of modules loaded        */
        uint32  mods_addr;              /* Address to the module info   */
        uint32  syms[4];                /* Info regarding ELF sections  */
        uint32  mmap_length;            /* Length(bytes) of mmap region */
        uint32  mmap_addr;              /* Address of the mmap regios   */
        uint32  drives_length;          /* Size of drives structures    */
        uint32  drives_addr;            /* Address of Drive structures  */
        uint32  config_table;           /* Address of ROM config table  */
        uint32  boot_loader_name;       /* Address of boot loader name  */
        uint32  apm_table;              /* Address of APM table         */
        uint32  vbe_control_info;       /* VBE control info             */
        uint32  vbe_mode_info;          /* VBE mode info                */
        uint16  vbe_mode;               /* Current Video mode           */
        uint16  vbe_interface_seg;      /* VBE related information      */
        uint16  vbe_interface_off;      /* VBE related information      */
        uint32  vbe_interface_len;      /* VBE related informarion      */
};

struct mbmregion {
        uint32  size;                   /* Entry Size                   */
        uint64  base_addr;              /* Memory region base address   */
        uint64  length;                 /* Memory region length         */
        uint32  type;                   /* Memory region type           */
};

/* Multiboot header magic number        */
#define MULTIBOOT_HEADER_MAGIC          0x1BADB002

/* Flags for required multiboot info    */
#define MULTIBOOT_HEADER_FLAGS          0x00010003

/* Multiboot signature verification     */
#define MULTIBOOT_SIGNATURE             0x2BADB002

/* mem_upper mem_lower fields valid     */
#define MULTIBOOT_BOOFINFO_MEM          0x00000001

/* boot device field valid              */
#define MULTIBOOT_BOOTINFO_BOOTDEV      0x00000002

/* cmdline field valid                  */
#define MULTIBOOT_BOOTINFO_CMDLINE      0x00000004

/* mods_count mods_addr valid           */
#define MULTIBOOT_BOOTINFO_MODS         0x00000008

/* mmap_length mmap_addr valid          */
#define MULTIBOOT_BOOTINFO_MMAP         0x00000040

/* Usable memory region                 */
#define MULTIBOOT_MMAP_TYPE_USABLE      0x00000001