Add multiboot header

src/multiboot.h

+/*
+  multiboot.h defines structures used in the multiboot standard
+
+  much of this file was closely inspired by the gnu version
+*/
+
+#ifndef _MULTIBOOT_INC
+#define _MULTIBOOT_INC
+
+#include <stdint.h>
+
+typedef struct
+{
+    uint32_t size;
+    uint64_t base_addr;
+    uint64_t length;
+    uint32_t type;
+} multiboot_memory_map;
+
+typedef struct
+{
+    uint32_t tabsize;
+    uint32_t strsize;
+    uint32_t addr;
+    uint32_t reserved;
+} aout_symbol_table;
+
+typedef struct
+{
+    uint32_t flags;
+    uint32_t mem_lower;
+    uint32_t mem_upper;
+    uint32_t boot_device;
+    uint32_t cmdline;
+    uint32_t mods_count;
+    uint32_t mods_addr;
+    union
+    {
+        aout_symbol_table aout_sym;
+    } u;
+    uint32_t mmap_length;
+    multiboot_memory_map* mmap_addr;
+
+} multiboot_info;
+
+
+
+#endif