Rework x86_64 paging and vmm

kernel/kprintf.h

@@ -2,8 +2,21 @@
 #define KPRINTF_H_
 
 #include <printf/printf.h>
+#include "term/term.h"
+#include "spinlock/spinlock.h"
+
+#define kprintf(fmt, ...) \
+  do { \
+    spinlock_acquire(&TERM.spinlock); \
+    printf_(fmt, ##__VA_ARGS__); \
+    spinlock_release(&TERM.spinlock); \
+  } while(0)
+
+#define kprintf_unsafe(fmt, ...) \
+  do { \
+    printf_(fmt, ##__VA_ARGS__); \
+  } while(0)
 
-#define kprintf     printf_
 #define ksprintf    sprintf_
 #define kvsprintf   vsprintf_
 #define ksnprintf   snprintf_