text: /* Access to hardware i/o ports.  Hurd/x86 version.
     Copyright (C) 2002-2020 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
  
     The GNU C Library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License as published by the Free Software Foundation; either
     version 2.1 of the License, or (at your option) any later version.
  
     The GNU C Library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public
     License along with the GNU C Library; if not, see
     <https://www.gnu.org/licenses/>.  */
  
  #include <sys/io.h>
  #include <hurd.h>
  #include <mach/i386/mach_i386.h>
  
  int
  ioperm (unsigned long int from, unsigned long int num, int turn_on)
  {
  #if ! HAVE_I386_IO_PERM_MODIFY
    return __hurd_fail (ENOSYS);
  #else
    error_t err;
    device_t devmaster;
  
    /* With the device master port we get a capability that represents
       this range of io ports.  */
    err = __get_privileged_ports (NULL, &devmaster);
    if (! err)
      {
        io_perm_t perm;
        err = __i386_io_perm_create (devmaster, from, from + num - 1, &perm);
        __mach_port_deallocate (__mach_task_self (), devmaster);
        if (! err)
  	{
  	  /* Now we add or remove that set from our task's bitmap.  */
  	  err = __i386_io_perm_modify (__mach_task_self (), perm, turn_on);
  	  __mach_port_deallocate (__mach_task_self (), perm);
  	}
  
        if (err == MIG_BAD_ID)	/* Old kernels don't have these RPCs.  */
  	err = ENOSYS;
      }
  
    return err ? __hurd_fail (err) : 0;
  #endif
  }
  