1  /* Access to hardware i/o ports.  Hurd/x86 version.
       2     Copyright (C) 2002-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <sys/io.h>
      20  #include <hurd.h>
      21  #ifdef __x86_64__
      22  #include <mach/x86_64/mach_i386.h>
      23  #else
      24  #include <mach/i386/mach_i386.h>
      25  #endif
      26  
      27  int
      28  ioperm (unsigned long int from, unsigned long int num, int turn_on)
      29  {
      30  #if ! HAVE_I386_IO_PERM_MODIFY
      31    return __hurd_fail (ENOSYS);
      32  #else
      33    error_t err;
      34    device_t devmaster;
      35  
      36    /* With the device master port we get a capability that represents
      37       this range of io ports.  */
      38    err = __get_privileged_ports (NULL, &devmaster);
      39    if (! err)
      40      {
      41        io_perm_t perm;
      42        err = __i386_io_perm_create (devmaster, from, from + num - 1, &perm);
      43        __mach_port_deallocate (__mach_task_self (), devmaster);
      44        if (! err)
      45  	{
      46  	  /* Now we add or remove that set from our task's bitmap.  */
      47  	  err = __i386_io_perm_modify (__mach_task_self (), perm, turn_on);
      48  	  __mach_port_deallocate (__mach_task_self (), perm);
      49  	}
      50  
      51        if (err == MIG_BAD_ID)	/* Old kernels don't have these RPCs.  */
      52  	err = ENOSYS;
      53      }
      54  
      55    return err ? __hurd_fail (err) : 0;
      56  #endif
      57  }