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