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- /*
- * Linux/PA-RISC Project (http://www.parisc-linux.org/)
- * Copyright (C) 1999,2003 Matthew Wilcox < willy at debian . org >
- * portions from "linux/ioctl.h for Linux" by H.H. Bergman.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #ifndef _ASM_PARISC_IOCTL_H
- #define _ASM_PARISC_IOCTL_H
- /* ioctl command encoding: 32 bits total, command in lower 16 bits,
- * size of the parameter structure in the lower 14 bits of the
- * upper 16 bits.
- * Encoding the size of the parameter structure in the ioctl request
- * is useful for catching programs compiled with old versions
- * and to avoid overwriting user space outside the user buffer area.
- * The highest 2 bits are reserved for indicating the ``access mode''.
- * NOTE: This limits the max parameter size to 16kB -1 !
- */
- #define _IOC_NRBITS 8
- #define _IOC_TYPEBITS 8
- #define _IOC_SIZEBITS 14
- #define _IOC_DIRBITS 2
- #define _IOC_NRMASK ((1 << _IOC_NRBITS)-1)
- #define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1)
- #define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1)
- #define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1)
- #define _IOC_NRSHIFT 0
- #define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS)
- #define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS)
- #define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS)
- /*
- * Direction bits.
- */
- #define _IOC_NONE 0U
- #define _IOC_WRITE 2U
- #define _IOC_READ 1U
- #define _IOC(dir,type,nr,size) \
- (((dir) << _IOC_DIRSHIFT) | \
- ((type) << _IOC_TYPESHIFT) | \
- ((nr) << _IOC_NRSHIFT) | \
- ((size) << _IOC_SIZESHIFT))
- /* provoke compile error for invalid uses of size argument */
- extern unsigned int __invalid_size_argument_for_IOC;
- #define _IOC_TYPECHECK(t) \
- ((sizeof(t) == sizeof(t[1]) && \
- sizeof(t) < (1 << _IOC_SIZEBITS)) ? \
- sizeof(t) : __invalid_size_argument_for_IOC)
- /* used to create numbers */
- #define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0)
- #define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))
- #define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
- #define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
- #define _IOR_BAD(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size))
- #define _IOW_BAD(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
- #define _IOWR_BAD(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
- /* used to decode ioctl numbers.. */
- #define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
- #define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
- #define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
- #define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
- /* ...and for the drivers/sound files... */
- #define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT)
- #define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT)
- #define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
- #define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT)
- #define IOCSIZE_SHIFT (_IOC_SIZESHIFT)
- #endif /* _ASM_PARISC_IOCTL_H */
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