1/* $Id: ioctl.h,v 1.1.1.1 2007/08/03 18:53:36 Exp $ */
2#ifndef _SPARC64_IOCTL_H
3#define _SPARC64_IOCTL_H
4
5/*
6 * Our DIR and SIZE overlap in order to simulteneously provide
7 * a non-zero _IOC_NONE (for binary compatibility) and
8 * 14 bits of size as on i386. Here's the layout:
9 *
10 *   0xE0000000   DIR
11 *   0x80000000     DIR = WRITE
12 *   0x40000000     DIR = READ
13 *   0x20000000     DIR = NONE
14 *   0x3FFF0000   SIZE (overlaps NONE bit)
15 *   0x0000FF00   TYPE
16 *   0x000000FF   NR (CMD)
17 */
18
19#define _IOC_NRBITS      8
20#define _IOC_TYPEBITS    8
21#define _IOC_SIZEBITS   13	/* Actually 14, see below. */
22#define _IOC_DIRBITS     3
23
24#define _IOC_NRMASK      ((1 << _IOC_NRBITS)-1)
25#define _IOC_TYPEMASK    ((1 << _IOC_TYPEBITS)-1)
26#define _IOC_SIZEMASK    ((1 << _IOC_SIZEBITS)-1)
27#define _IOC_XSIZEMASK   ((1 << (_IOC_SIZEBITS+1))-1)
28#define _IOC_DIRMASK     ((1 << _IOC_DIRBITS)-1)
29
30#define _IOC_NRSHIFT     0
31#define _IOC_TYPESHIFT   (_IOC_NRSHIFT + _IOC_NRBITS)
32#define _IOC_SIZESHIFT   (_IOC_TYPESHIFT + _IOC_TYPEBITS)
33#define _IOC_DIRSHIFT    (_IOC_SIZESHIFT + _IOC_SIZEBITS)
34
35#define _IOC_NONE        1U
36#define _IOC_READ        2U
37#define _IOC_WRITE       4U
38
39#define _IOC(dir,type,nr,size) \
40        (((dir)  << _IOC_DIRSHIFT) | \
41         ((type) << _IOC_TYPESHIFT) | \
42         ((nr)   << _IOC_NRSHIFT) | \
43         ((size) << _IOC_SIZESHIFT))
44
45#define _IO(type,nr)        _IOC(_IOC_NONE,(type),(nr),0)
46#define _IOR(type,nr,size)  _IOC(_IOC_READ,(type),(nr),sizeof(size))
47#define _IOW(type,nr,size)  _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
48#define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
49
50/* Used to decode ioctl numbers in drivers despite the leading underscore... */
51#define _IOC_DIR(nr)    \
52 ( (((((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) & (_IOC_WRITE|_IOC_READ)) != 0)?   \
53                            (((nr) >> _IOC_DIRSHIFT) & (_IOC_WRITE|_IOC_READ)):  \
54                            (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) )
55#define _IOC_TYPE(nr)       (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
56#define _IOC_NR(nr)         (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
57#define _IOC_SIZE(nr)   \
58 ((((((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) & (_IOC_WRITE|_IOC_READ)) == 0)?    \
59                         0: (((nr) >> _IOC_SIZESHIFT) & _IOC_XSIZEMASK))
60
61/* ...and for the PCMCIA and sound. */
62#define IOC_IN          (_IOC_WRITE << _IOC_DIRSHIFT)
63#define IOC_OUT         (_IOC_READ << _IOC_DIRSHIFT)
64#define IOC_INOUT       ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
65#define IOCSIZE_MASK    (_IOC_XSIZEMASK << _IOC_SIZESHIFT)
66#define IOCSIZE_SHIFT   (_IOC_SIZESHIFT)
67
68#endif /* !(_SPARC64_IOCTL_H) */
69