uapi/asm/ioctl.h

0001 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
0002 #ifndef _SPARC_IOCTL_H
0003 #define _SPARC_IOCTL_H
0004
0005 /*
0006  * Our DIR and SIZE overlap in order to simulteneously provide
0007  * a non-zero _IOC_NONE (for binary compatibility) and
0008  * 14 bits of size as on i386. Here's the layout:
0009  *
0010  *   0xE0000000   DIR
0011  *   0x80000000     DIR = WRITE
0012  *   0x40000000     DIR = READ
0013  *   0x20000000     DIR = NONE
0014  *   0x3FFF0000   SIZE (overlaps NONE bit)
0015  *   0x0000FF00   TYPE
0016  *   0x000000FF   NR (CMD)
0017  */
0018
0019 #define _IOC_NRBITS      8
0020 #define _IOC_TYPEBITS    8
0021 #define _IOC_SIZEBITS   13  /* Actually 14, see below. */
0022 #define _IOC_DIRBITS     3
0023
0024 #define _IOC_NRMASK      ((1 << _IOC_NRBITS)-1)
0025 #define _IOC_TYPEMASK    ((1 << _IOC_TYPEBITS)-1)
0026 #define _IOC_SIZEMASK    ((1 << _IOC_SIZEBITS)-1)
0027 #define _IOC_XSIZEMASK   ((1 << (_IOC_SIZEBITS+1))-1)
0028 #define _IOC_DIRMASK     ((1 << _IOC_DIRBITS)-1)
0029
0030 #define _IOC_NRSHIFT     0
0031 #define _IOC_TYPESHIFT   (_IOC_NRSHIFT + _IOC_NRBITS)
0032 #define _IOC_SIZESHIFT   (_IOC_TYPESHIFT + _IOC_TYPEBITS)
0033 #define _IOC_DIRSHIFT    (_IOC_SIZESHIFT + _IOC_SIZEBITS)
0034
0035 #define _IOC_NONE        1U
0036 #define _IOC_READ        2U
0037 #define _IOC_WRITE       4U
0038
0039 #define _IOC(dir,type,nr,size) \
0040         (((dir)  << _IOC_DIRSHIFT) | \
0041          ((type) << _IOC_TYPESHIFT) | \
0042          ((nr)   << _IOC_NRSHIFT) | \
0043          ((size) << _IOC_SIZESHIFT))
0044
0045 #define _IO(type,nr)        _IOC(_IOC_NONE,(type),(nr),0)
0046 #define _IOR(type,nr,size)  _IOC(_IOC_READ,(type),(nr),sizeof(size))
0047 #define _IOW(type,nr,size)  _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
0048 #define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
0049
0050 /* Used to decode ioctl numbers in drivers despite the leading underscore... */
0051 #define _IOC_DIR(nr)    \
0052  ( (((((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) & (_IOC_WRITE|_IOC_READ)) != 0)?   \
0053                             (((nr) >> _IOC_DIRSHIFT) & (_IOC_WRITE|_IOC_READ)):  \
0054                             (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) )
0055 #define _IOC_TYPE(nr)       (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
0056 #define _IOC_NR(nr)         (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
0057 #define _IOC_SIZE(nr)   \
0058  ((((((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) & (_IOC_WRITE|_IOC_READ)) == 0)?    \
0059                          0: (((nr) >> _IOC_SIZESHIFT) & _IOC_XSIZEMASK))
0060
0061 /* ...and for the PCMCIA and sound. */
0062 #define IOC_IN          (_IOC_WRITE << _IOC_DIRSHIFT)
0063 #define IOC_OUT         (_IOC_READ << _IOC_DIRSHIFT)
0064 #define IOC_INOUT       ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
0065 #define IOCSIZE_MASK    (_IOC_XSIZEMASK << _IOC_SIZESHIFT)
0066 #define IOCSIZE_SHIFT   (_IOC_SIZESHIFT)
0067
0068 #endif /* !(_SPARC_IOCTL_H) */