1 /* Access to hardware i/o ports. Hurd/x86 version.
2 Copyright (C) 2002-2022 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 #include <mach/i386/mach_i386.h>
22
23 int
ioperm(unsigned long int from,unsigned long int num,int turn_on)24 ioperm (unsigned long int from, unsigned long int num, int turn_on)
25 {
26 #if ! HAVE_I386_IO_PERM_MODIFY
27 return __hurd_fail (ENOSYS);
28 #else
29 error_t err;
30 device_t devmaster;
31
32 /* With the device master port we get a capability that represents
33 this range of io ports. */
34 err = __get_privileged_ports (NULL, &devmaster);
35 if (! err)
36 {
37 io_perm_t perm;
38 err = __i386_io_perm_create (devmaster, from, from + num - 1, &perm);
39 __mach_port_deallocate (__mach_task_self (), devmaster);
40 if (! err)
41 {
42 /* Now we add or remove that set from our task's bitmap. */
43 err = __i386_io_perm_modify (__mach_task_self (), perm, turn_on);
44 __mach_port_deallocate (__mach_task_self (), perm);
45 }
46
47 if (err == MIG_BAD_ID) /* Old kernels don't have these RPCs. */
48 err = ENOSYS;
49 }
50
51 return err ? __hurd_fail (err) : 0;
52 #endif
53 }
54