xref: /openbmc/linux/arch/parisc/include/uapi/asm/ioctl.h (revision e2be04c7)
1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2 /*
3  *    Linux/PA-RISC Project (http://www.parisc-linux.org/)
4  *    Copyright (C) 1999,2003 Matthew Wilcox < willy at debian . org >
5  *    portions from "linux/ioctl.h for Linux" by H.H. Bergman.
6  *
7  *    This program is free software; you can redistribute it and/or modify
8  *    it under the terms of the GNU General Public License as published by
9  *    the Free Software Foundation; either version 2 of the License, or
10  *    (at your option) any later version.
11  *
12  *    This program is distributed in the hope that it will be useful,
13  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
14  *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  *    GNU General Public License for more details.
16  *
17  *    You should have received a copy of the GNU General Public License
18  *    along with this program; if not, write to the Free Software
19  *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20  */
21 
22 
23 #ifndef _ASM_PARISC_IOCTL_H
24 #define _ASM_PARISC_IOCTL_H
25 
26 /* ioctl command encoding: 32 bits total, command in lower 16 bits,
27  * size of the parameter structure in the lower 14 bits of the
28  * upper 16 bits.
29  * Encoding the size of the parameter structure in the ioctl request
30  * is useful for catching programs compiled with old versions
31  * and to avoid overwriting user space outside the user buffer area.
32  * The highest 2 bits are reserved for indicating the ``access mode''.
33  * NOTE: This limits the max parameter size to 16kB -1 !
34  */
35 
36 /*
37  * Direction bits.
38  */
39 #define _IOC_NONE	0U
40 #define _IOC_WRITE	2U
41 #define _IOC_READ	1U
42 
43 #include <asm-generic/ioctl.h>
44 
45 #endif /* _ASM_PARISC_IOCTL_H */
46