diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index daa2f7181..c346b8764 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -316,7 +316,7 @@ int devind;
 int proc;
 {
 	int i, r;
-	u8_t ilr;
+	int ilr;
 	struct io_range ior;
 	struct mem_range mr;
 
@@ -348,7 +348,7 @@ int proc;
 		"pci_reserve3: for proc %d, adding I/O range [0x%x..0x%x]\n",
 				proc, ior.ior_base, ior.ior_limit);
 			}
-			r= sys_privctl(proc, SYS_PRIV_ADD_IO, 0, &ior);
+			r= sys_privctl(proc, SYS_PRIV_ADD_IO, &ior);
 			if (r != OK)
 			{
 				printf("sys_privctl failed for proc %d: %d\n",
@@ -366,7 +366,7 @@ int proc;
 	"pci_reserve3: for proc %d, should add memory range [0x%x..0x%x]\n",
 				proc, mr.mr_base, mr.mr_limit);
 			}
-			r= sys_privctl(proc, SYS_PRIV_ADD_MEM, 0, &mr);
+			r= sys_privctl(proc, SYS_PRIV_ADD_MEM, &mr);
 			if (r != OK)
 			{
 				printf("sys_privctl failed for proc %d: %d\n",
@@ -378,7 +378,7 @@ int proc;
 	if (ilr != PCI_ILR_UNKNOWN)
 	{
 		if(debug) printf("pci_reserve3: adding IRQ %d\n", ilr);
-		r= sys_privctl(proc, SYS_PRIV_ADD_IRQ, ilr, NULL);
+		r= sys_privctl(proc, SYS_PRIV_ADD_IRQ, &ilr);
 		if (r != OK)
 		{
 			printf("sys_privctl failed for proc %d: %d\n",
diff --git a/include/minix/com.h b/include/minix/com.h
index 4402fa760..b13d7e65d 100755
--- a/include/minix/com.h
+++ b/include/minix/com.h
@@ -493,7 +493,6 @@
 /* Field names for SYS_TRACE, SYS_PRIVCTL. */
 #define CTL_ENDPT    m2_i1	/* process number of the caller */
 #define CTL_REQUEST    m2_i2	/* server control request */
-#define CTL_MM_PRIV    m2_i3	/* privilege as seen by PM */
 #define CTL_ARG_PTR    m2_p1	/* pointer to argument */
 #define CTL_ADDRESS    m2_l1	/* address at traced process' space */
 #define CTL_DATA       m2_l2	/* data field for tracing */
diff --git a/include/minix/syslib.h b/include/minix/syslib.h
index 9b51b76ac..8af499dc5 100755
--- a/include/minix/syslib.h
+++ b/include/minix/syslib.h
@@ -40,7 +40,7 @@ _PROTOTYPE( int sys_newmap, (endpoint_t proc, struct mem_map *ptr));
 _PROTOTYPE( int sys_exit, (endpoint_t proc));
 _PROTOTYPE( int sys_trace, (int req, endpoint_t proc, long addr, long *data_p));
 
-_PROTOTYPE( int sys_privctl, (endpoint_t proc, int req, int i, void *p));
+_PROTOTYPE( int sys_privctl, (endpoint_t proc, int req, void *p));
 _PROTOTYPE( int sys_setgrant, (cp_grant_t *grants, int ngrants));
 _PROTOTYPE( int sys_nice, (endpoint_t proc, int priority));
 
diff --git a/kernel/system/do_privctl.c b/kernel/system/do_privctl.c
index 175da2bf7..a44201f5c 100644
--- a/kernel/system/do_privctl.c
+++ b/kernel/system/do_privctl.c
@@ -2,7 +2,9 @@
  *   m_type:	SYS_PRIVCTL
  *
  * The parameters for this kernel call are:
- *    m1_i1:	PR_ENDPT 	(process number of caller)	
+ *    m2_i1:	CTL_ENDPT 	(process endpoint of target)
+ *    m2_i2:	CTL_REQUEST	(privilege control request)
+ *    m2_p1:	CTL_ARG_PTR	(pointer to request data)
  */
 
 #include "../system.h"
@@ -32,6 +34,7 @@ message *m_ptr;			/* pointer to request message */
   struct io_range io_range;
   struct mem_range mem_range;
   struct priv priv;
+  int irq;
 
   /* Check whether caller is allowed to make this call. Privileged proceses 
    * can only update the privileges of processes that are inhibited from 
@@ -40,8 +43,8 @@ message *m_ptr;			/* pointer to request message */
    */
   caller_ptr = proc_addr(who_p);
   if (! (priv(caller_ptr)->s_flags & SYS_PROC)) return(EPERM); 
-  if(m_ptr->PR_ENDPT == SELF) proc_nr = who_p;
-  else if(!isokendpt(m_ptr->PR_ENDPT, &proc_nr)) return(EINVAL);
+  if(m_ptr->CTL_ENDPT == SELF) proc_nr = who_p;
+  else if(!isokendpt(m_ptr->CTL_ENDPT, &proc_nr)) return(EINVAL);
   rp = proc_addr(proc_nr);
 
   switch(m_ptr->CTL_REQUEST)
@@ -216,12 +219,14 @@ message *m_ptr;			/* pointer to request message */
 	if (!(priv(rp)->s_flags & SYS_PROC))
 		return EPERM;
 
+	data_copy(who_e, (vir_bytes) m_ptr->CTL_ARG_PTR,
+		SYSTEM, (vir_bytes) &irq, sizeof(irq));
 	priv(rp)->s_flags |= CHECK_IRQ;	/* Check IRQs */
 
 	i= priv(rp)->s_nr_irq;
 	if (i >= NR_IRQ)
 		return ENOMEM;
-	priv(rp)->s_irq_tab[i]= m_ptr->CTL_MM_PRIV;
+	priv(rp)->s_irq_tab[i]= irq;
 	priv(rp)->s_nr_irq++;
 
 	return OK;
diff --git a/lib/syslib/sys_privctl.c b/lib/syslib/sys_privctl.c
index 9c14aa5c8..71a1bee1c 100644
--- a/lib/syslib/sys_privctl.c
+++ b/lib/syslib/sys_privctl.c
@@ -1,12 +1,11 @@
 #include "syslib.h"
 
-int sys_privctl(int proc, int request, int i, void *p)
+int sys_privctl(endpoint_t proc, int request, void *p)
 {
   message m;
 
   m.CTL_ENDPT = proc;
   m.CTL_REQUEST = request;
-  m.CTL_MM_PRIV = i;
   m.CTL_ARG_PTR = p;
 
   return _taskcall(SYSTASK, SYS_PRIVCTL, &m);
diff --git a/lib/syslib/sys_svrctl.c b/lib/syslib/sys_svrctl.c
deleted file mode 100644
index 7fc8ad130..000000000
--- a/lib/syslib/sys_svrctl.c
+++ /dev/null
@@ -1,13 +0,0 @@
-#include "syslib.h"
-
-int sys_svrctl(int proc, int request, int priv, vir_bytes argp)
-{
-  message m;
-
-  m.CTL_ENDPT = proc;
-  m.CTL_REQUEST = request;
-  m.CTL_MM_PRIV = priv;
-  m.CTL_ARG_PTR = (char *) argp;
-
-  return _taskcall(SYSTASK, SYS_PRIVCTL, &m);
-}
diff --git a/servers/rs/manager.c b/servers/rs/manager.c
index 49b4f17f4..884f36480 100644
--- a/servers/rs/manager.c
+++ b/servers/rs/manager.c
@@ -855,7 +855,7 @@ endpoint_t *endpoint;
   /* Set the privilege structure for the child process to let is run.
    * This should succeed: we tested number in use above.
    */
-  if ((s = sys_privctl(child_proc_nr_e, SYS_PRIV_INIT, 0, privp)) < 0) {
+  if ((s = sys_privctl(child_proc_nr_e, SYS_PRIV_INIT, privp)) < 0) {
       report("RS","sys_privctl call failed", s);	/* to let child run */
       rp->r_flags |= RS_EXITING;			/* expect exit */
       if(child_pid > 0) kill(child_pid, SIGKILL);	/* kill driver */
@@ -1080,7 +1080,7 @@ struct rproc *rp;
 		 * run.
 		 */
 		proc_nr_e = getnprocnr(pid);
-		r= sys_privctl(proc_nr_e, SYS_PRIV_USER, 0, NULL);
+		r= sys_privctl(proc_nr_e, SYS_PRIV_USER, NULL);
 		if (r < 0)
 			printf("RS: run_script: sys_privctl call failed: %d\n", r);