Big code refactor, get rid of HAL entirely

kernel/pmm/pmm.c

@@ -1,13 +1,13 @@
 #include <stddef.h>
 #include <limine.h>
-#include "pmm.h"
-#include "kprintf.h"
+#include "pmm/pmm.h"
 #include "bitmap/bitmap.h"
 #include "bootinfo/bootinfo.h"
 #include "spinlock/spinlock.h"
 #include "util/util.h"
-#include "hal/hal.h"
 #include "std/string.h"
+#include "cpu/hang.h"
+#include "kprintf.h"
 
 PhysMem PHYS_MEM;
 
@@ -32,7 +32,7 @@ void pmm_init(void) {
 
   if (!memmap_ent) {
     ERR("pmm", "required memory: {%lx}\n", bm->nbytes);
-    hal_hang();
+    cpu_hang();
   }
 
   size_t physbegin = memmap_ent->base;