Implemented multiboot check

kernel/include/kmain/multiboot.h

@@ -0,0 +1,20 @@
+#ifndef KMAIN_MULTIBOOT_H_
+#define KMAIN_MULTIBOOT_H_
+
+#include "kernel/multiboot.h"
+
+#include <stdint.h>
+
+/*
+ * multiboot_init
+ *  Check whether important information is present in multiboot info structure.
+ *  Also check that the magic number is correct.
+ *
+ * @param mb_info  - Multiboot info structure
+ * @param mb_magic - Multiboot magic number
+ *
+ */
+
+void multiboot_init(multiboot_info_t *mb_info, uint32_t mb_magic);
+
+#endif

kernel/kernel/multiboot.c

@@ -0,0 +1,24 @@
+#include "kernel/multiboot.h"
+#include "kmain/multiboot.h"
+#include "kernel/log.h"
+
+/*
+ * multiboot_init:
+ * ---------------
+ *
+ *  Check flags field in mb_info and check the magic number.
+ *
+ */
+
+void multiboot_init(multiboot_info_t *mb_info, uint32_t mb_magic) {
+
+    if (mb_magic != MULTIBOOT_BOOTLOADER_MAGIC)
+        panic("Not a multiboot bootloader!");
+
+    if (!mb_info)
+        panic("Invalid multiboot pointer");
+
+    if (!(mb_info->flags & MULTIBOOT_INFO_MEMORY))
+        panic("There is no memory info in multiboot");
+
+}