PMM and liballoc port

kernel/libk/align.h

@@ -0,0 +1,8 @@
+#ifndef _KERNEL_LIBK_ALIGN_H
+#define _KERNEL_LIBK_ALIGN_H
+
+#define div_align_up(x, div) (((x) + (div) - 1) / (div))
+#define align_down(x, a)  ((x) & ~((a) - 1))
+#define align_up(x, a)  (((x) + ((a) - 1)) & ~((a) - 1))
+
+#endif // _KERNEL_LIBK_ALIGN_H