diff --git a/reactos/drivers/storage/scsiport/scsiport.pspec b/reactos/drivers/storage/scsiport/scsiport.pspec
new file mode 100644
index 00000000000..65c75471c4d
--- /dev/null
+++ b/reactos/drivers/storage/scsiport/scsiport.pspec
@@ -0,0 +1,51 @@
+#ifdef __x86_64__
+#define MAYBEFWD(x)
+#else
+#define MAYBEFWD(x) x
+#endif
+
+@ cdecl ScsiDebugPrint()
+@ stdcall ScsiPortCompleteRequest(ptr long long long long)
+@ stdcall ScsiPortConvertPhysicalAddressToUlong(long long)
+@ stdcall ScsiPortConvertUlongToPhysicalAddress(long) MAYBEFWD(NTOSKRNL.RtlConvertUlongToLargeInteger)
+@ stdcall ScsiPortFlushDma(ptr)
+@ stdcall ScsiPortFreeDeviceBase(ptr ptr)
+@ stdcall ScsiPortGetBusData(ptr long long long ptr long)
+@ stdcall ScsiPortGetDeviceBase(ptr long long long long long long)
+@ stdcall ScsiPortGetLogicalUnit(ptr long long long)
+@ stdcall ScsiPortGetPhysicalAddress(ptr ptr ptr long)
+@ stdcall ScsiPortGetSrb(ptr long long long long)
+@ stdcall ScsiPortGetUncachedExtension(ptr ptr long)
+@ stdcall ScsiPortGetVirtualAddress(ptr long long)
+@ stdcall ScsiPortInitialize(ptr ptr ptr ptr)
+@ stdcall ScsiPortIoMapTransfer(ptr ptr long long)
+@ stdcall ScsiPortLogError(ptr ptr long long long long long)
+@ stdcall ScsiPortMoveMemory(ptr ptr long)
+@ cdecl ScsiPortNotification()
+@ stdcall ScsiPortReadPortBufferUchar(ptr ptr long) MAYBEFWD(HAL.READ_PORT_BUFFER_UCHAR)
+@ stdcall ScsiPortReadPortBufferUshort(ptr ptr long) MAYBEFWD(HAL.READ_PORT_BUFFER_USHORT)
+@ stdcall ScsiPortReadPortBufferUlong(ptr ptr long) MAYBEFWD(HAL.READ_PORT_BUFFER_ULONG)
+@ stdcall ScsiPortReadPortUchar(ptr) MAYBEFWD(HAL.READ_PORT_UCHAR)
+@ stdcall ScsiPortReadPortUshort(ptr) MAYBEFWD(HAL.READ_PORT_USHORT)
+@ stdcall ScsiPortReadPortUlong(ptr) MAYBEFWD(HAL.READ_PORT_ULONG)
+@ stdcall ScsiPortReadRegisterBufferUchar(ptr ptr long) MAYBEFWD(NTOSKRNL.READ_REGISTER_BUFFER_UCHAR)
+@ stdcall ScsiPortReadRegisterBufferUshort(ptr ptr long) MAYBEFWD(NTOSKRNL.READ_REGISTER_BUFFER_USHORT)
+@ stdcall ScsiPortReadRegisterBufferUlong(ptr ptr long) MAYBEFWD(NTOSKRNL.READ_REGISTER_BUFFER_ULONG)
+@ stdcall ScsiPortReadRegisterUchar(ptr) MAYBEFWD(NTOSKRNL.READ_REGISTER_UCHAR)
+@ stdcall ScsiPortReadRegisterUshort(ptr) MAYBEFWD(NTOSKRNL.READ_REGISTER_USHORT)
+@ stdcall ScsiPortReadRegisterUlong(ptr) MAYBEFWD(NTOSKRNL.READ_REGISTER_ULONG)
+@ stdcall ScsiPortSetBusDataByOffset(ptr long long long ptr long long)
+@ stdcall ScsiPortStallExecution(long) HAL.KeStallExecutionProcessor
+@ stdcall ScsiPortValidateRange(ptr long long long long long long)
+@ stdcall ScsiPortWritePortBufferUchar(ptr ptr long) MAYBEFWD(HAL.WRITE_PORT_BUFFER_UCHAR)
+@ stdcall ScsiPortWritePortBufferUshort(ptr ptr long) MAYBEFWD(HAL.WRITE_PORT_BUFFER_USHORT)
+@ stdcall ScsiPortWritePortBufferUlong(ptr ptr long) MAYBEFWD(HAL.WRITE_PORT_BUFFER_ULONG)
+@ stdcall ScsiPortWritePortUchar(ptr long) MAYBEFWD(HAL.WRITE_PORT_UCHAR)
+@ stdcall ScsiPortWritePortUshort(ptr long) MAYBEFWD(HAL.WRITE_PORT_USHORT)
+@ stdcall ScsiPortWritePortUlong(ptr long) MAYBEFWD(HAL.WRITE_PORT_ULONG)
+@ stdcall ScsiPortWriteRegisterBufferUchar(ptr ptr long) MAYBEFWD(NTOSKRNL.WRITE_REGISTER_BUFFER_UCHAR)
+@ stdcall ScsiPortWriteRegisterBufferUshort(ptr ptr long) MAYBEFWD(NTOSKRNL.WRITE_REGISTER_BUFFER_USHORT)
+@ stdcall ScsiPortWriteRegisterBufferUlong(ptr ptr long) MAYBEFWD(NTOSKRNL.WRITE_REGISTER_BUFFER_ULONG)
+@ stdcall ScsiPortWriteRegisterUchar(ptr long) MAYBEFWD(NTOSKRNL.WRITE_REGISTER_UCHAR)
+@ stdcall ScsiPortWriteRegisterUshort(ptr long) MAYBEFWD(NTOSKRNL.WRITE_REGISTER_USHORT)
+@ stdcall ScsiPortWriteRegisterUlong(ptr long) MAYBEFWD(NTOSKRNL.WRITE_REGISTER_ULONG)
diff --git a/reactos/drivers/storage/scsiport/scsiport.rbuild b/reactos/drivers/storage/scsiport/scsiport.rbuild
index 81a67633467..6686e93c752 100644
--- a/reactos/drivers/storage/scsiport/scsiport.rbuild
+++ b/reactos/drivers/storage/scsiport/scsiport.rbuild
@@ -3,11 +3,12 @@
 <module name="scsiport" type="kernelmodedriver" installbase="system32/drivers" installname="scsiport.sys">
 	<bootstrap installbase="$(CDOUTPUT)" />
 	<define name="_SCSIPORT_" />
-	<importlibrary definition="scsiport.spec" />
+	<importlibrary definition="scsiport.pspec" />
 	<include base="scsiport">.</include>
 	<library>ntoskrnl</library>
 	<library>hal</library>
 	<file>scsiport.c</file>
+	<file>stubs.c</file>
 	<file>scsiport.rc</file>
-	<file>scsiport.spec</file>
+	<file>scsiport.pspec</file>
 </module>
diff --git a/reactos/drivers/storage/scsiport/scsiport.spec b/reactos/drivers/storage/scsiport/scsiport.spec
deleted file mode 100644
index b779b1ee557..00000000000
--- a/reactos/drivers/storage/scsiport/scsiport.spec
+++ /dev/null
@@ -1,45 +0,0 @@
-@ cdecl ScsiDebugPrint()
-@ stdcall ScsiPortCompleteRequest(ptr long long long long)
-@ stdcall ScsiPortConvertPhysicalAddressToUlong(long long)
-@ stdcall ScsiPortConvertUlongToPhysicalAddress(long) NTOSKRNL.RtlConvertUlongToLargeInteger
-@ stdcall ScsiPortFlushDma(ptr)
-@ stdcall ScsiPortFreeDeviceBase(ptr ptr)
-@ stdcall ScsiPortGetBusData(ptr long long long ptr long)
-@ stdcall ScsiPortGetDeviceBase(ptr long long long long long long)
-@ stdcall ScsiPortGetLogicalUnit(ptr long long long)
-@ stdcall ScsiPortGetPhysicalAddress(ptr ptr ptr long)
-@ stdcall ScsiPortGetSrb(ptr long long long long)
-@ stdcall ScsiPortGetUncachedExtension(ptr ptr long)
-@ stdcall ScsiPortGetVirtualAddress(ptr long long)
-@ stdcall ScsiPortInitialize(ptr ptr ptr ptr)
-@ stdcall ScsiPortIoMapTransfer(ptr ptr long long)
-@ stdcall ScsiPortLogError(ptr ptr long long long long long)
-@ stdcall ScsiPortMoveMemory(ptr ptr long)
-@ cdecl ScsiPortNotification()
-@ stdcall ScsiPortReadPortBufferUchar(ptr ptr long) HAL.READ_PORT_BUFFER_UCHAR
-@ stdcall ScsiPortReadPortBufferUshort(ptr ptr long) HAL.READ_PORT_BUFFER_USHORT
-@ stdcall ScsiPortReadPortBufferUlong(ptr ptr long) HAL.READ_PORT_BUFFER_ULONG
-@ stdcall ScsiPortReadPortUchar(ptr) HAL.READ_PORT_UCHAR
-@ stdcall ScsiPortReadPortUshort(ptr) HAL.READ_PORT_USHORT
-@ stdcall ScsiPortReadPortUlong(ptr) HAL.READ_PORT_ULONG
-@ stdcall ScsiPortReadRegisterBufferUchar(ptr ptr long) NTOSKRNL.READ_REGISTER_BUFFER_UCHAR
-@ stdcall ScsiPortReadRegisterBufferUshort(ptr ptr long) NTOSKRNL.READ_REGISTER_BUFFER_USHORT
-@ stdcall ScsiPortReadRegisterBufferUlong(ptr ptr long) NTOSKRNL.READ_REGISTER_BUFFER_ULONG
-@ stdcall ScsiPortReadRegisterUchar(ptr) NTOSKRNL.READ_REGISTER_UCHAR
-@ stdcall ScsiPortReadRegisterUshort(ptr) NTOSKRNL.READ_REGISTER_USHORT
-@ stdcall ScsiPortReadRegisterUlong(ptr) NTOSKRNL.READ_REGISTER_ULONG
-@ stdcall ScsiPortSetBusDataByOffset(ptr long long long ptr long long)
-@ stdcall ScsiPortStallExecution(long) HAL.KeStallExecutionProcessor
-@ stdcall ScsiPortValidateRange(ptr long long long long long long)
-@ stdcall ScsiPortWritePortBufferUchar(ptr ptr long) HAL.WRITE_PORT_BUFFER_UCHAR
-@ stdcall ScsiPortWritePortBufferUshort(ptr ptr long) HAL.WRITE_PORT_BUFFER_USHORT
-@ stdcall ScsiPortWritePortBufferUlong(ptr ptr long) HAL.WRITE_PORT_BUFFER_ULONG
-@ stdcall ScsiPortWritePortUchar(ptr long) HAL.WRITE_PORT_UCHAR
-@ stdcall ScsiPortWritePortUshort(ptr long) HAL.WRITE_PORT_USHORT
-@ stdcall ScsiPortWritePortUlong(ptr long) HAL.WRITE_PORT_ULONG
-@ stdcall ScsiPortWriteRegisterBufferUchar(ptr ptr long) NTOSKRNL.WRITE_REGISTER_BUFFER_UCHAR
-@ stdcall ScsiPortWriteRegisterBufferUshort(ptr ptr long) NTOSKRNL.WRITE_REGISTER_BUFFER_USHORT
-@ stdcall ScsiPortWriteRegisterBufferUlong(ptr ptr long) NTOSKRNL.WRITE_REGISTER_BUFFER_ULONG
-@ stdcall ScsiPortWriteRegisterUchar(ptr long) NTOSKRNL.WRITE_REGISTER_UCHAR
-@ stdcall ScsiPortWriteRegisterUshort(ptr long) NTOSKRNL.WRITE_REGISTER_USHORT
-@ stdcall ScsiPortWriteRegisterUlong(ptr long) NTOSKRNL.WRITE_REGISTER_ULONG
diff --git a/reactos/drivers/storage/scsiport/stubs.c b/reactos/drivers/storage/scsiport/stubs.c
new file mode 100644
index 00000000000..9e286d186f4
--- /dev/null
+++ b/reactos/drivers/storage/scsiport/stubs.c
@@ -0,0 +1,250 @@
+/*
+ * COPYRIGHT:       See COPYING in the top level directory
+ * PROJECT:         ReactOS Storage Stack
+ * FILE:            drivers/storage/scsiport/stubs.c
+ * PURPOSE:         SCSI port driver
+ * PROGRAMMER:      Timo Kreuzer (timo.kreuzer@reactos.org)
+ */
+
+/* INCLUDES *****************************************************************/
+
+#include <ntddk.h>
+#include <srb.h>
+
+#define NDEBUG
+#include <debug.h>
+
+#ifdef _MSC_VER
+  #define DDKAPI
+#endif
+
+SCSI_PHYSICAL_ADDRESS
+DDKAPI
+ScsiPortConvertUlongToPhysicalAddress(
+    IN ULONG  UlongAddress)
+{
+    return RtlConvertUlongToLargeInteger(UlongAddress);
+}
+
+VOID
+DDKAPI
+ScsiPortReadPortBufferUchar(
+    IN PUCHAR Port,
+    IN PUCHAR Buffer,
+    IN ULONG  Count)
+{
+    READ_PORT_BUFFER_UCHAR(Port, Buffer, Count);
+}
+
+VOID
+DDKAPI
+ScsiPortReadPortBufferUshort(
+    IN PUSHORT Port,
+    IN PUSHORT Buffer,
+    IN ULONG   Count)
+{
+    READ_PORT_BUFFER_USHORT(Port, Buffer, Count);
+}
+
+VOID
+DDKAPI
+ScsiPortReadPortBufferUlong(
+    IN PULONG Port,
+    IN PULONG Buffer,
+    IN ULONG  Count)
+{
+    READ_PORT_BUFFER_ULONG(Port, Buffer, Count);
+}
+
+UCHAR
+DDKAPI
+ScsiPortReadPortUchar(
+    IN PUCHAR Port)
+{
+    return READ_PORT_UCHAR(Port);
+}
+
+USHORT
+DDKAPI
+ScsiPortReadPortUshort(
+    IN PUSHORT Port)
+{
+    return READ_PORT_USHORT(Port);
+}
+
+ULONG
+DDKAPI
+ScsiPortReadPortUlong(
+    IN PULONG Port)
+{
+    return READ_PORT_ULONG(Port);
+}
+
+VOID
+DDKAPI
+ScsiPortReadRegisterBufferUchar(
+    IN PUCHAR Register,
+    IN PUCHAR Buffer,
+    IN ULONG Count)
+{
+    READ_REGISTER_BUFFER_UCHAR(Register, Buffer, Count);
+}
+
+VOID
+DDKAPI
+ScsiPortReadRegisterBufferUshort(
+    IN PUSHORT Register,
+    IN PUSHORT Buffer,
+    IN ULONG Count)
+{
+    READ_REGISTER_BUFFER_USHORT(Register, Buffer, Count);
+}
+
+VOID
+DDKAPI
+ScsiPortReadRegisterBufferUlong(
+    IN PULONG Register,
+    IN PULONG Buffer,
+    IN ULONG Count)
+{
+    READ_REGISTER_BUFFER_ULONG(Register, Buffer, Count);
+}
+
+UCHAR
+DDKAPI
+ScsiPortReadRegisterUchar(
+    IN PUCHAR Register)
+{
+    return READ_REGISTER_UCHAR(Register);
+}
+
+USHORT
+DDKAPI
+ScsiPortReadRegisterUshort(
+    IN PUSHORT Register)
+{
+    return READ_REGISTER_USHORT(Register);
+}
+
+ULONG
+DDKAPI
+ScsiPortReadRegisterUlong(
+    IN PULONG Register)
+{
+    return READ_REGISTER_ULONG(Register);
+}
+
+VOID
+DDKAPI
+ScsiPortWritePortBufferUchar(
+    IN PUCHAR Port,
+    IN PUCHAR Buffer,
+    IN ULONG Count)
+{
+    WRITE_PORT_BUFFER_UCHAR(Port, Buffer, Count);
+}
+
+VOID
+DDKAPI
+ScsiPortWritePortBufferUshort(
+    IN PUSHORT Port,
+    IN PUSHORT Buffer,
+    IN ULONG Count)
+{
+    WRITE_PORT_BUFFER_USHORT(Port, Buffer, Count);
+}
+
+VOID
+DDKAPI
+ScsiPortWritePortBufferUlong(
+    IN PULONG Port,
+    IN PULONG Buffer,
+    IN ULONG Count)
+{
+    WRITE_PORT_BUFFER_ULONG(Port, Buffer, Count);
+}
+
+VOID
+DDKAPI
+ScsiPortWritePortUchar(
+    IN PUCHAR Port,
+    IN UCHAR Value)
+{
+    WRITE_PORT_UCHAR(Port, Value);
+}
+
+VOID
+DDKAPI
+ScsiPortWritePortUshort(
+    IN PUSHORT Port,
+    IN USHORT Value)
+{
+    WRITE_PORT_USHORT(Port, Value);
+}
+
+VOID
+DDKAPI
+ScsiPortWritePortUlong(
+    IN PULONG Port,
+    IN ULONG Value)
+{
+    WRITE_PORT_ULONG(Port, Value);
+}
+
+VOID
+DDKAPI
+ScsiPortWriteRegisterBufferUchar(
+    IN PUCHAR Register,
+    IN PUCHAR Buffer,
+    IN ULONG Count)
+{
+    WRITE_REGISTER_BUFFER_UCHAR(Register, Buffer, Count);
+}
+
+VOID
+DDKAPI
+ScsiPortWriteRegisterBufferUshort(
+    IN PUSHORT Register,
+    IN PUSHORT Buffer,
+    IN ULONG Count)
+{
+    WRITE_REGISTER_BUFFER_USHORT(Register, Buffer, Count);
+}
+
+VOID
+DDKAPI
+ScsiPortWriteRegisterBufferUlong(
+    IN PULONG Register,
+    IN PULONG Buffer,
+    IN ULONG Count)
+{
+    WRITE_REGISTER_BUFFER_ULONG(Register, Buffer, Count);
+}
+
+VOID
+DDKAPI
+ScsiPortWriteRegisterUchar(
+    IN PUCHAR  Register,
+    IN ULONG  Value)
+{
+    WRITE_REGISTER_UCHAR(Register, Value);
+}
+
+VOID
+DDKAPI
+ScsiPortWriteRegisterUshort(
+    IN PUSHORT Register,
+    IN USHORT Value)
+{
+    WRITE_REGISTER_USHORT(Register, Value);
+}
+
+VOID
+DDKAPI
+ScsiPortWriteRegisterUlong(
+    IN PULONG Register,
+    IN ULONG Value)
+{
+    WRITE_REGISTER_ULONG(Register, Value);
+}
+