diff --git a/arch/arm/include/arm/irq.h b/arch/arm/include/arm/irq.h
index 65ccd135630..befc1218b25 100644
--- a/arch/arm/include/arm/irq.h
+++ b/arch/arm/include/arm/irq.h
@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/arm/include/arm/irq.h
  *
- *   Copyright (C) 2009-2010 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009-2011 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -204,8 +204,46 @@ static inline void irqrestore(irqstate_t flags)
      : "memory");
 }
 
-static inline void system_call(swint_t func, int parm1,
-			       int parm2, int parm3)
+static inline void system_call0(unsigned int nbr)
+{
+  __asm__ __volatile__
+    (
+     "mov\tr0,%0\n\t"
+     "swi\t0x900001\n\t"
+     :
+     : "r" ((long)(nbr))
+     : "r0", "lr");
+}
+
+static inline void system_call1(unsigned int nbr, uintptr_t parm1)
+{
+  __asm__ __volatile__
+    (
+     "mov\tr0,%0\n\t"
+     "mov\tr1,%1\n\t"
+     "swi\t0x900001\n\t"
+     :
+     : "r" ((long)(nbr)),  "r" ((long)(parm1))
+     : "r0", "r1", "lr");
+}
+
+static inline void system_call2(unsigned int nbr, uintptr_t parm1,
+			                    uintptr_t parm2)
+{
+  __asm__ __volatile__
+    (
+     "mov\tr0,%0\n\t"
+     "mov\tr1,%1\n\t"
+     "mov\tr2,%2\n\t"
+     "swi\t0x900001\n\t"
+     :
+     : "r" ((long)(nbr)),  "r" ((long)(parm1)),
+       "r" ((long)(parm2))
+     : "r0", "r1", "r2", "lr");
+}
+
+static inline void system_call3(unsigned int nbr, uintptr_t parm1,
+			                    uintptr_t parm2, uintptr_t parm3)
 {
   __asm__ __volatile__
     (
@@ -215,10 +253,11 @@ static inline void system_call(swint_t func, int parm1,
      "mov\tr3,%3\n\t"
      "swi\t0x900001\n\t"
      :
-     : "r" ((long)(func)),  "r" ((long)(parm1)),
+     : "r" ((long)(nbr)),  "r" ((long)(parm1)),
        "r" ((long)(parm2)), "r" ((long)(parm3))
      : "r0", "r1", "r2", "r3", "lr");
 }
+
 #endif /* __ASSEMBLY__ */
 
 /****************************************************************************
diff --git a/arch/arm/include/cortexm3/irq.h b/arch/arm/include/cortexm3/irq.h
index 3f731385b46..f57c1dc332f 100644
--- a/arch/arm/include/cortexm3/irq.h
+++ b/arch/arm/include/cortexm3/irq.h
@@ -1,7 +1,7 @@
 /****************************************************************************
  * arch/arm/include/cortexm3/irq.h
  *
- *   Copyright (C) 2009 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -49,7 +49,6 @@
 #  include <stdint.h>
 #endif
 
-
 /****************************************************************************
  * Definitions
  ****************************************************************************/
@@ -281,6 +280,61 @@ static inline void svcall(uint32_t cmd, uint32_t arg)
       : "r" (cmd), "r" (arg)
       : "memory");
 }
+
+static inline void system_call0(unsigned int nbr)
+{
+  __asm__ __volatile__
+    (
+      "mov\tr0,%0\n\t"
+      "\tsvc  0\n"
+      :
+      : "r" ((long)(nbr))
+      : "r0", "lr");
+}
+
+static inline void system_call1(unsigned int nbr, uintptr_t parm1)
+{
+  __asm__ __volatile__
+    (
+      "mov\tr0,%0\n\t"
+      "mov\tr1,%1\n\t"
+      "\tsvc  0\n"
+      :
+      : "r" ((long)(nbr)), "r" ((long)(parm1))
+      : "r0", "r1", "lr");
+}
+
+static inline void system_call2(unsigned int nbr, uintptr_t parm1,
+			                    uintptr_t parm2)
+{
+  __asm__ __volatile__
+    (
+      "mov\tr0,%0\n\t"
+      "mov\tr1,%1\n\t"
+      "mov\tr2,%2\n\t"
+      "\tsvc  0\n"
+      :
+      : "r" ((long)(nbr)), "r" ((long)(parm1)),
+       "r" ((long)(parm2))
+      : "r0", "r1", "r2", "lr");
+}
+
+static inline void system_call3(unsigned int nbr, uintptr_t parm1,
+			                    uintptr_t parm2, uintptr_t parm3)
+{
+  __asm__ __volatile__
+    (
+      "mov\tr0,%0\n\t"
+      "mov\tr1,%1\n\t"
+      "mov\tr2,%2\n\t"
+      "mov\tr3,%3\n\t"
+      "\tsvc  0\n"
+      :
+      : "r" ((long)(nbr)),  "r" ((long)(parm1)),
+        "r" ((long)(parm2)), "r" ((long)(parm3))
+      : "r0", "r1", "r2", "r3", "lr");
+}
+
 #endif /* __ASSEMBLY__ */
 
 /****************************************************************************
diff --git a/arch/avr/include/avr32/irq.h b/arch/avr/include/avr32/irq.h
index a9d0d862645..691bc72d48f 100644
--- a/arch/avr/include/avr32/irq.h
+++ b/arch/avr/include/avr32/irq.h
@@ -188,6 +188,12 @@ static inline void irqrestore(irqstate_t flags)
       );
     }
 }
+
+static inline void system_call3(unsigned int nbr, uintptr_t parm1,
+			                    uintptr_t parm2, uintptr_t parm3)
+{
+  /* To be provided */
+}
 #endif /* __ASSEMBLY__ */
 
 /****************************************************************************
diff --git a/arch/hc/include/hc12/irq.h b/arch/hc/include/hc12/irq.h
index b499b171d1b..8754dc5d8ae 100755
--- a/arch/hc/include/hc12/irq.h
+++ b/arch/hc/include/hc12/irq.h
@@ -1,7 +1,7 @@
 /************************************************************************************
  * arch/hc/include/hc12/irq.h
  *
- *   Copyright (C) 2009 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -81,8 +81,8 @@ static inline void irqrestore(irqstate_t flags)
   /* To be provided */
 }
 
-static inline void system_call(swint_t func, int parm1,
-                               int parm2, int parm3)
+static inline void system_call3(unsigned int nbr, uintptr_t parm1,
+			                    uintptr_t parm2, uintptr_t parm3)
 {
   /* To be provided */
 }
diff --git a/arch/hc/include/hcs12/irq.h b/arch/hc/include/hcs12/irq.h
index cb3eb8ecbb2..d6162b82e23 100755
--- a/arch/hc/include/hcs12/irq.h
+++ b/arch/hc/include/hcs12/irq.h
@@ -243,7 +243,12 @@ static inline void irqrestore(irqstate_t flags)
 
 /* System call */
 
-#define system_call(f,p1,p2,p3) __asm("swi")
+static inline void system_call3(unsigned int nbr, uintptr_t parm1,
+			                    uintptr_t parm2, uintptr_t parm3)
+{
+  /* To be provided */
+  /* __asm("swi") */
+}
 
 /************************************************************************************
  * Public Data
diff --git a/arch/x86/include/i486/irq.h b/arch/x86/include/i486/irq.h
index 43735219936..bca34b3ba98 100755
--- a/arch/x86/include/i486/irq.h
+++ b/arch/x86/include/i486/irq.h
@@ -256,6 +256,12 @@ static inline void irqrestore(irqstate_t flags)
     }
 }
 
+static inline void system_call3(unsigned int nbr, uintptr_t parm1,
+			                    uintptr_t parm2, uintptr_t parm3)
+{
+  /* To be provided */
+}
+
 /****************************************************************************
  * Public Variables
  ****************************************************************************/