diff --git a/kernel/include/multiboot.h b/kernel/include/multiboot.h
new file mode 100644
index 0000000..d45779f
--- /dev/null
+++ b/kernel/include/multiboot.h
@@ -0,0 +1,139 @@
+
+#ifndef MULTIBOOT_H
+#define MULTIBOOT_H
+
+#include "hos_types.h"
+
+/* The magic number for the Multiboot header. */
+#define MB_HEADER_MAGIC             0x1BADB002
+
+#define MB_HEADER_ALIGN_MODULES     (1 << 0)
+#define MB_HEADER_MEM_INFO          (1 << 1)
+#define MB_HEADER_VIDEO_INFO        (1 << 2)
+#define MB_HEADER_KLUDGE_OFFSETS    (1 << 16)
+
+/* The magic number passed by a Multiboot-compliant boot loader. */
+#define MB_BOOTLOADER_MAGIC         0x2BADB002
+
+#define MB_BOOTLOADER_MEM_INFO      (1 << 0)
+#define MB_BOOTLOADER_BOOT_DEVICE   (1 << 1)
+#define MB_BOOTLOADER_COMMAND_LINE  (1 << 2)
+#define MB_BOOTLOADER_MODS          (1 << 3)
+#define MB_BOOTLOADER_AOUT          (1 << 4)
+#define MB_BOOTLOADER_ELF           (1 << 5)
+#define MB_BOOTLOADER_MMAP          (1 << 6)
+#define MB_BOOTLOADER_DRIVES        (1 << 7)
+#define MB_BOOTLOADER_CONFIG        (1 << 8)
+#define MB_BOOTLOADER_APM           (1 << 9)
+#define MB_BOOTLOADER_GRAPHICS      (1 << 10)
+
+#define MB_DRIVE_MODE_CHS           0
+#define MB_DRIVE_MODE_LBA           1
+
+/* The Multiboot header. */
+typedef struct
+{
+    u32_t   magic;
+    u32_t   flags;
+    u32_t   checksum;
+    u32_t   header_addr;
+    u32_t   load_addr;
+    u32_t   load_end_addr;
+    u32_t   bss_end_addr;
+    u32_t   entry_addr;
+} mb_header_t;
+
+/* The symbol table for a.out. */
+typedef struct
+{
+    u32_t   tabsize;
+    u32_t   strsize;
+    u32_t   addr;
+    u32_t   reserved;
+} mb_aout_symbol_table_t;
+
+/* The section header table for ELF. */
+typedef struct
+{
+    u32_t   num;
+    u32_t   size;
+    u32_t   addr;
+    u32_t   shndx;
+} mb_elf_section_header_table_t;
+
+/* The Multiboot information. */
+typedef struct
+{
+    u32_t   flags;
+    u32_t   mem_lower;          // present if flags[0] is set
+    u32_t   mem_upper;
+    u32_t   boot_device;        // 1
+    u32_t   cmdline;            // 2
+    u32_t   mods_count;         // 3
+    u32_t   mods_addr;
+    union
+    {
+        mb_aout_symbol_table_t          aout_sym;   // 4
+        mb_elf_section_header_table_t   elf_sec;    // 5
+    };
+    u32_t   mmap_length;        // 6
+    u32_t   mmap_addr;
+    u32_t   drives_length;      // 7
+    u32_t   drives_addr;
+    u32_t   config_table;       // 8
+    u32_t   bootloader_name;    // 9
+    u32_t   apm_table;          // 10
+
+    u32_t   vbe_control_info;   // 11
+    u32_t   vbe_mode_info;
+    u16_t   vbe_mode;
+    u16_t   vbe_interface_seg;
+    u16_t   vbe_interface_off;
+    u16_t   vbe_interface_len;
+} mb_info_t;
+
+/* The module structure. */
+typedef struct
+{
+    u32_t   mod_start;
+    u32_t   mod_end;
+    u32_t   string;
+    u32_t   reserved;
+} mb_module_t;
+
+/* The memory map. Be careful that the offset 0 is base_addr_low, not size. */
+typedef struct
+{
+    u32_t   size;                 // offset -4
+    u64_t   base;                 // offset 0
+    u64_t   length;
+    u32_t   type;
+} mb_mmap_t;
+
+/* The drive structure */
+typedef struct
+{
+    u32_t   size;
+    u8_t    drive_number;
+    u8_t    drive_mode;
+    u8_t    drive_cylinders;
+    u8_t    drive_heads;
+    u8_t    drive_sectors;
+    u16_t   drive_ports[1];
+} mb_drive_t;
+
+/* APM table structure */
+typedef struct
+{
+    u16_t   version;
+    u16_t   cseg;
+    u32_t   offset;
+    u16_t   cseg_16;
+    u16_t   dseg;
+    u16_t   flags;
+    u16_t   cseg_len;
+    u16_t   cseg_16_len;
+    u16_t   dseg_len;
+} mb_apm_t;
+
+#endif