Initialize USB after enabling interrupts so Time can be used

src/hulk/hulk.d

@@ -84,11 +84,12 @@ void hulk_start()
     Rtc.initialize();
     Pit.initialize();
     Pci.initialize();
-    Usb.initialize();
     Thread.initialize();
 
     resume_interrupts();
 
+    Usb.initialize();
+
     /* Run kernel tests. */
     Test.run();
     Klog.writefln("\a5HULK Initialization Complete!");

src/hulk/pci.d

@@ -223,7 +223,7 @@ struct Pci
                 ulong mm_region_address = (cast(ulong)r[0] & 0xFFFF_FFF0u) | (cast(ulong)r[1] << 32u);
                 ulong length = ~((cast(ulong)s[0] & 0xFFFF_FFF0u) | (cast(ulong)s[1] << 32u)) + 1u;
                 ulong flags = (r[0] & 0x8) != 0u ? PT_WRITE_THROUGH : 0u;
-                Hurl.identity_map_range(mm_region_address, length, flags);
+                Hurl.identity_map_range(mm_region_address, length, PT_WRITABLE | flags);
                 memory_ranges[range_index].address = mm_region_address;
                 memory_ranges[range_index].length = length;
                 range_index++;

src/hulk/time.d

@@ -34,7 +34,7 @@ struct Time
      */
     public static void msleep(ulong count)
     {
-        ulong wait_for = s_uptime + count + 1;
+        ulong wait_for = uptime() + count + 1;
         while (uptime() < wait_for)
         {
         }