Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/include/asm-alpha/ioctl.h
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File MIME type: text/plain
File size: 2292 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | #ifndef _ALPHA_IOCTL_H |
2 | #define _ALPHA_IOCTL_H |
3 | |
4 | /* |
5 | * The original linux ioctl numbering scheme was just a general |
6 | * "anything goes" setup, where more or less random numbers were |
7 | * assigned. Sorry, I was clueless when I started out on this. |
8 | * |
9 | * On the alpha, we'll try to clean it up a bit, using a more sane |
10 | * ioctl numbering, and also trying to be compatible with OSF/1 in |
11 | * the process. I'd like to clean it up for the i386 as well, but |
12 | * it's so painful recognizing both the new and the old numbers.. |
13 | */ |
14 | |
15 | #define _IOC_NRBITS 8 |
16 | #define _IOC_TYPEBITS 8 |
17 | #define _IOC_SIZEBITS 13 |
18 | #define _IOC_DIRBITS 3 |
19 | |
20 | #define _IOC_NRMASK ((1 << _IOC_NRBITS)-1) |
21 | #define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1) |
22 | #define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1) |
23 | #define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1) |
24 | |
25 | #define _IOC_NRSHIFT 0 |
26 | #define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS) |
27 | #define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS) |
28 | #define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS) |
29 | |
30 | /* |
31 | * Direction bits _IOC_NONE could be 0, but OSF/1 gives it a bit. |
32 | * And this turns out useful to catch old ioctl numbers in header |
33 | * files for us. |
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 | ((unsigned int) \ |
41 | (((dir) << _IOC_DIRSHIFT) | \ |
42 | ((type) << _IOC_TYPESHIFT) | \ |
43 | ((nr) << _IOC_NRSHIFT) | \ |
44 | ((size) << _IOC_SIZESHIFT))) |
45 | |
46 | /* used to create numbers */ |
47 | #define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0) |
48 | #define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size)) |
49 | #define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size)) |
50 | #define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size)) |
51 | |
52 | /* used to decode them.. */ |
53 | #define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) |
54 | #define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK) |
55 | #define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK) |
56 | #define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK) |
57 | |
58 | /* ...and for the drivers/sound files... */ |
59 | |
60 | #define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT) |
61 | #define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT) |
62 | #define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT) |
63 | #define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT) |
64 | #define IOCSIZE_SHIFT (_IOC_SIZESHIFT) |
65 | |
66 | #endif /* _ALPHA_IOCTL_H */ |