diff --git a/arch/main.c b/arch/main.c
index 5c2e3ae..00cb44a 100644
--- a/arch/main.c
+++ b/arch/main.c
@@ -4,6 +4,8 @@
 #include "gdt.h"
 #include "idt.h"
 
+static void print_multiboot2_info(unsigned long addr);
+
 void main(unsigned int multiboot_magic, unsigned long multiboot_info)
 {
     logger_initialize();
@@ -13,6 +15,7 @@ void main(unsigned int multiboot_magic, unsigned long multiboot_info)
     }
     else if (multiboot_magic == KERNELMQ_MULTIBOOT_2_MAGIC) {
         logger_info("Loaded with Multiboot-compliant bootloader, specification version 2.");
+        print_multiboot2_info(multiboot_info);
     }
     else {
         logger_warn("Loaded with no Multiboot-compliant bootloader.");
@@ -33,3 +36,121 @@ void main(unsigned int multiboot_magic, unsigned long multiboot_info)
     logger_warn("Nothing to do.");
     logger_fail("Halt.");
 }
+
+#include "console.h"
+
+#define COLUMNS   80
+#define LINES     24
+#define ATTRIBUTE 7
+#define VIDEO     0xB8000
+
+static int xpos;
+static int ypos;
+
+static volatile unsigned char *video;
+
+static void itoa(char *buf, int base, int d);
+static void printf(const char *format, ...);
+
+void print_multiboot2_info(unsigned long addr)
+{
+    logger_info("Multiboot 2 info:");
+}
+
+void itoa(char *buf, int base, int d)
+{
+    char *p = buf;
+    char *p1, *p2;
+    unsigned long ud = d;
+    int divisor = 10;
+    /*
+     * If %d is specified and D is minus, put '-' in the head.
+     * */
+    if (base == 'd' && d < 0)
+    {
+        *p++ = '-';
+        buf++;
+        ud = -d;
+    }
+    else if (base == 'x')
+        divisor = 16;
+    /*
+     * Divide UD by DIVISOR until UD == 0.
+     * */
+    do
+    {
+        int remainder = ud % divisor;
+        *p++ = (remainder < 10) ? remainder + '0' : remainder + 'a' - 10;
+    }
+    while (ud /= divisor);
+    /*
+     * Terminate BUF.
+     * */
+    *p = 0;
+    /*
+     * Reverse BUF.
+     * */
+    p1 = buf;
+    p2 = p - 1;
+    while (p1 < p2)
+    {
+        char tmp = *p1;
+        *p1 = *p2;
+        *p2 = tmp;
+        p1++;
+        p2--;
+    }
+}
+
+void printf(const char *format, ...)
+{
+    char **arg = (char **) &format;
+    int c;
+    char buf[20];
+    arg++;
+    while ((c = *format++) != 0)
+    {
+        if (c != '%')
+            console_putc(c);
+        else
+        {
+            char *p, *p2;
+            int pad0 = 0, pad = 0;
+            c = *format++;
+            if (c == '0')
+            {
+                pad0 = 1;
+                c = *format++;
+            }
+            if (c >= '0' && c <= '9')
+            {
+                pad = c - '0';
+                c = *format++;
+            }
+            switch (c)
+            {
+                case 'd':
+                case 'u':
+                case 'x':
+                    itoa (buf, c, *((int *) arg++));
+                    p = buf;
+                    goto string;
+                    break;
+                case 's':
+                    p = *arg++;
+                    if (! p)
+                        p = "(null)";
+string:
+                    for (p2 = p; *p2; p2++);
+                    for (; p2 < p + pad; p2++)
+                        console_putc(pad0 ? '0' : ' ');
+                    while (*p)
+                        console_putc(*p++);
+                    break;
+                default:
+                    console_putc(*((int *) arg++));
+                    break;
+            }
+        }
+    }
+}