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authorBrian Gerst <bgerst@didntduck.org>2006-01-09 23:52:18 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-10 11:01:34 -0500
commitaf4cd3fe4cfa75ca74f8d8622867371289043a8d (patch)
tree70dc7836a98758578628a96dc609a0c67f78dffb /include/asm-arm
parent7ff92053ddff48d9d7908a353bd85f893944463e (diff)
[PATCH] Generic ioctl.h
Most arches copied the i386 ioctl.h. Combine them into a generic header. Signed-off-by: Brian Gerst <bgerst@didntduck.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-arm')
-rw-r--r--include/asm-arm/ioctl.h75
1 files changed, 1 insertions, 74 deletions
diff --git a/include/asm-arm/ioctl.h b/include/asm-arm/ioctl.h
index 2cbb7d0e9dc6..b279fe06dfe5 100644
--- a/include/asm-arm/ioctl.h
+++ b/include/asm-arm/ioctl.h
@@ -1,74 +1 @@
1/* #include <asm-generic/ioctl.h>
2 * linux/ioctl.h for Linux by H.H. Bergman.
3 */
4
5#ifndef _ASMARM_IOCTL_H
6#define _ASMARM_IOCTL_H
7
8/* ioctl command encoding: 32 bits total, command in lower 16 bits,
9 * size of the parameter structure in the lower 14 bits of the
10 * upper 16 bits.
11 * Encoding the size of the parameter structure in the ioctl request
12 * is useful for catching programs compiled with old versions
13 * and to avoid overwriting user space outside the user buffer area.
14 * The highest 2 bits are reserved for indicating the ``access mode''.
15 * NOTE: This limits the max parameter size to 16kB -1 !
16 */
17
18/*
19 * The following is for compatibility across the various Linux
20 * platforms. The i386 ioctl numbering scheme doesn't really enforce
21 * a type field. De facto, however, the top 8 bits of the lower 16
22 * bits are indeed used as a type field, so we might just as well make
23 * this explicit here. Please be sure to use the decoding macros
24 * below from now on.
25 */
26#define _IOC_NRBITS 8
27#define _IOC_TYPEBITS 8
28#define _IOC_SIZEBITS 14
29#define _IOC_DIRBITS 2
30
31#define _IOC_NRMASK ((1 << _IOC_NRBITS)-1)
32#define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1)
33#define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1)
34#define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1)
35
36#define _IOC_NRSHIFT 0
37#define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS)
38#define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS)
39#define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS)
40
41/*
42 * Direction bits.
43 */
44#define _IOC_NONE 0U
45#define _IOC_WRITE 1U
46#define _IOC_READ 2U
47
48#define _IOC(dir,type,nr,size) \
49 (((dir) << _IOC_DIRSHIFT) | \
50 ((type) << _IOC_TYPESHIFT) | \
51 ((nr) << _IOC_NRSHIFT) | \
52 ((size) << _IOC_SIZESHIFT))
53
54/* used to create numbers */
55#define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0)
56#define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size))
57#define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
58#define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
59
60/* used to decode ioctl numbers.. */
61#define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
62#define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
63#define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
64#define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
65
66/* ...and for the drivers/sound files... */
67
68#define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT)
69#define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT)
70#define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
71#define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT)
72#define IOCSIZE_SHIFT (_IOC_SIZESHIFT)
73
74#endif /* _ASMARM_IOCTL_H */