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1da177e4 LT |
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 */ |