kernel/arch/i386/do_iopenable.c

   1 /* The system call implemented in this file:
   2  *   m_type:    SYS_IOPENABLE
   3  *
   4  * The parameters for this system call are:
   5  *    m2_i2:    IO_ENDPT        (process to give I/O Protection Level bits)
   6  *
   7  * Author:
   8  *    Jorrit N. Herder <jnherder@cs.vu.nl>
   9  */
  10
  11 #include "../../system.h"
  12 #include "../../kernel.h"
  13 #include <minix/endpoint.h>
  14
  15 #include "proto.h"
  16
  17 /*===========================================================================*
  18  *                              do_iopenable                                 *
  19  *===========================================================================*/
  20 PUBLIC int do_iopenable(struct proc * caller, message * m_ptr)
  21 {
  22   int proc_nr;
  23
  24 #if 1 /* ENABLE_USERPRIV && ENABLE_USERIOPL */
  25   if (m_ptr->IO_ENDPT == SELF) {
  26         proc_nr = _ENDPOINT_P(caller->p_endpoint);
  27   } else if(!isokendpt(m_ptr->IO_ENDPT, &proc_nr))
  28         return(EINVAL);
  29   enable_iop(proc_addr(proc_nr));
  30   return(OK);
  31 #else
  32   return(EPERM);
  33 #endif
  34 }
  35
  36