diff --git a/src/hulk/time.d b/src/hulk/time.d
index 70954ea..b6bd041 100644
--- a/src/hulk/time.d
+++ b/src/hulk/time.d
@@ -3,12 +3,12 @@
  */
 module hulk.time;
 
-import core.volatile;
+import hulk.volatile;
 
 struct Time
 {
     /** System uptime (ms). */
-    private static __gshared ulong s_uptime;
+    private static __gshared Volatile!ulong s_uptime;
 
     /**
      * Millisecond ISR.
@@ -23,7 +23,7 @@ struct Time
      */
     public static @property ulong uptime()
     {
-        return volatileLoad(&s_uptime);
+        return s_uptime;
     }
 
     /**
diff --git a/src/hulk/usb/xhci.d b/src/hulk/usb/xhci.d
index c6c1eb2..a1a4321 100644
--- a/src/hulk/usb/xhci.d
+++ b/src/hulk/usb/xhci.d
@@ -12,7 +12,7 @@ import hulk.pci;
 import hulk.hurl.a1;
 import hulk.klog;
 import hulk.time;
-import core.volatile;
+import hulk.volatile;
 
 struct XHCI
 {
@@ -27,14 +27,14 @@ struct XHCI
          * Offset from beginning of capability registers to beginning of
          * operational registers.
          */
-        ubyte capability_length;
+        Volatile!ubyte capability_length;
 
         ubyte _reserved01;
 
         /**
          * Interface version number supported (psuedo-BSD).
          */
-        ushort hci_version;
+        Volatile!ushort hci_version;
 
         /**
          * HCSPARAMS1.
@@ -43,7 +43,7 @@ struct XHCI
          * 23:19 reserved
          * 31:24 number of ports (MaxPorts)
          */
-        uint hcs_params1;
+        Volatile!uint hcs_params1;
 
         /**
          * 3:0 isochronous scheduling threshold (IST)
@@ -53,14 +53,14 @@ struct XHCI
          * 26 scratchpad restore (SPR)
          * 31:27 max scratchpad buffers (low 5 bits)
          */
-        uint hcs_params2;
+        Volatile!uint hcs_params2;
 
         /**
          * 7:0 U1 device exit latency
          * 15:8 reserved
          * 31:16 U2 device exit latency
          */
-        uint hcs_params3;
+        Volatile!uint hcs_params3;
 
         /**
          * 0 64-bit addressing capability (AC64)
@@ -80,7 +80,7 @@ struct XHCI
          *   offset in 32-bit words from base of capability registers to base
          *   of capabilities list
          */
-        uint hcc_params1;
+        Volatile!uint hcc_params1;
 
         /**
          * 1:0 reserved
@@ -88,13 +88,13 @@ struct XHCI
          *   offset in 32-bit words from base of capability registers to the
          *   doorbell array
          */
-        uint doorbell_offset;
+        Volatile!uint doorbell_offset;
 
         /**
          * 4:0 reserved
          * 31:5 runtime register space offset
          */
-        uint rts_offset;
+        Volatile!uint rts_offset;
 
         /**
          * 0 U3 entry capability (U3C)
@@ -109,13 +109,13 @@ struct XHCI
          * 9 virtualization based trusted I/O capability (VTC; xHCI v1.2+)
          * 31:10 reserved
          */
-        uint hcc_params2;
+        Volatile!uint hcc_params2;
 
         /**
          * 11:0 reserved
          * 31:12 VTIO register space offset (xHCI v1.2+)
          */
-        uint vtios_offset;
+        Volatile!uint vtios_offset;
     }
     static assert(CapabilityRegisters.sizeof == 0x24u);
 
@@ -142,7 +142,7 @@ struct XHCI
          * 16 VTIO enable (VTIOE; xHCI v1.2+)
          * 31:17 reserved
          */
-        uint usb_command;
+        Volatile!uint usb_command;
 
         /**
          * 0 HCHalted
@@ -158,13 +158,13 @@ struct XHCI
          * 12 Host Controller Error (HCE)
          * 31:13 reserved
          */
-        uint usb_status;
+        Volatile!uint usb_status;
 
         /**
          * 15:0 Page Size (actual page size is 2^(x+12))
          * 31:16 reserved
          */
-        uint page_size;
+        Volatile!uint page_size;
 
         uint[2] _reserved01;
 
@@ -172,7 +172,7 @@ struct XHCI
          * 15:0 Notification Enable
          * 31:16 reserved
          */
-        uint dn_ctrl;
+        Volatile!uint dn_ctrl;
 
         /**
          * 0 Ring Cycle State (RCS)
@@ -182,7 +182,7 @@ struct XHCI
          * 5:4 reserved
          * 63:6 Command Ring Pointer
          */
-        ulong cr_ctrl;
+        Volatile!ulong cr_ctrl;
 
         uint[4] _reserved02;
 
@@ -190,7 +190,7 @@ struct XHCI
          * 5:0 reserved
          * 63:6 Device Context Base Address Array Pointer
          */
-        ulong dcbaap;
+        Volatile!ulong dcbaap;
 
         /**
          * 7:0 Max Device Slots Enabled (MaxSlotsEn)
@@ -198,7 +198,7 @@ struct XHCI
          * 9 Configuration Information Enable (CIE; xHCI v1.1+)
          * 31:10 reserved
          */
-        uint config;
+        Volatile!uint config;
 
         uint _reserved03;
     }
@@ -239,22 +239,22 @@ struct XHCI
          * 30 Device Removable
          * 31 Warm Port Reset
          */
-        uint portsc;
+        Volatile!uint portsc;
 
         /**
          * Port Power Management Status and Control
          */
-        uint portpmsc;
+        Volatile!uint portpmsc;
 
         /**
          * Port Link Info
          */
-        uint portli;
+        Volatile!uint portli;
 
         /**
          * Port Hardware LPM Control (xHCI v1.1+)
          */
-        uint porthlpmc;
+        Volatile!uint porthlpmc;
     }
     static assert(PortRegisters.sizeof == 0x10u);
 
@@ -266,7 +266,7 @@ struct XHCI
         /**
          * Microframe index. Incremented by controller each microframe.
          */
-        uint mfindex;
+        Volatile!uint mfindex;
 
         uint[7] _reserved01;
 
@@ -289,21 +289,21 @@ struct XHCI
          * 1 Interrupt Enable
          * 31:2 reserved
          */
-        uint imr;
+        Volatile!uint imr;
 
         /**
          * Interrupter Moderation.
          * 15:0 Interrupt Moderation Interval
          * 31:16 Interrupt Moderation Counter
          */
-        uint im;
+        Volatile!uint im;
 
         /**
          * Event Ring Segment Table Size.
          * 15:0 Event Ring Segment Table Size
          * 31:16 reserved
          */
-        uint ersts;
+        Volatile!uint ersts;
 
         uint reserved;
 
@@ -312,7 +312,7 @@ struct XHCI
          * 5:0 reserved
          * 63:6 Event Ring Segment Table Base Address
          */
-        ulong erstba;
+        Volatile!ulong erstba;
 
         /**
          * Event Ring Dequeue Pointer.
@@ -320,7 +320,7 @@ struct XHCI
          * 3 Event Handler Busy
          * 63:4 Event Ring Dequeue Pointer
          */
-        ulong erdp;
+        Volatile!ulong erdp;
     }
 
     /**
@@ -331,9 +331,9 @@ struct XHCI
      */
     struct DoorbellRegister
     {
-        ubyte target;
+        Volatile!ubyte target;
         ubyte _reserved01;
-        ushort task_id;
+        Volatile!ushort task_id;
     }
     static assert(DoorbellRegister.sizeof == 4u);
 
@@ -361,7 +361,7 @@ struct XHCI
         /* TODO: write dcbaap. */
         /* TODO: write cr_ctrl. */
         /+ TODO:
-        m_operational_registers.config = volatileLoad(&m_capability_registers.hcs_params1) & 0xFu;
+        m_operational_registers.config = m_capability_registers.hcs_params1 & 0xFu;
         m_operational_registers.dn_ctrl = 1u << 1u;
         +/
         /* TODO: set up interrupt register set. */
@@ -419,7 +419,7 @@ struct XHCI
         {
             Time.msleep(1u);
 
-            if ((volatileLoad(&m_operational_registers.usb_status) & 1u) != 0u)
+            if ((m_operational_registers.usb_status & 1u) != 0u)
             {
                 break;
             }
@@ -441,8 +441,8 @@ struct XHCI
         {
             Time.msleep(1u);
 
-            if (((volatileLoad(&m_operational_registers.usb_command) & (1u << 1u)) == 0u) &&
-                ((volatileLoad(&m_operational_registers.usb_status) & (1u << 11u)) == 0u))
+            if (((m_operational_registers.usb_command & (1u << 1u)) == 0u) &&
+                ((m_operational_registers.usb_status & (1u << 11u)) == 0u))
             {
                 break;
             }
diff --git a/src/hulk/volatile.d b/src/hulk/volatile.d
new file mode 100644
index 0000000..f202d24
--- /dev/null
+++ b/src/hulk/volatile.d
@@ -0,0 +1,35 @@
+module hulk.volatile;
+
+import core.volatile;
+
+struct Volatile(T)
+{
+    private T value;
+
+    public @property T read()
+    {
+        return volatileLoad(&value);
+    }
+    alias read this;
+
+    public void opAssign(T value)
+    {
+        volatileStore(&this.value, value);
+    }
+
+    public T opUnary(string s)()
+    {
+        T v = read();
+        mixin(s ~ "v;");
+        volatileStore(&this.value, v);
+        return v;
+    }
+
+    public T opOpAssign(string s)(T rhs)
+    {
+        T v = read();
+        mixin("v " ~ s ~ "= rhs;");
+        volatileStore(&this.value, v);
+        return v;
+    }
+}