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a37c8875 | 1 | #ifndef _ASM_POWERPC_IOCTL_H |
2 | #define _ASM_POWERPC_IOCTL_H | |
1da177e4 LT |
3 | |
4 | ||
5 | /* | |
6 | * this was copied from the alpha as it's a bit cleaner there. | |
7 | * -- Cort | |
8 | */ | |
9 | ||
10 | #define _IOC_NRBITS 8 | |
11 | #define _IOC_TYPEBITS 8 | |
12 | #define _IOC_SIZEBITS 13 | |
13 | #define _IOC_DIRBITS 3 | |
14 | ||
15 | #define _IOC_NRMASK ((1 << _IOC_NRBITS)-1) | |
16 | #define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1) | |
17 | #define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1) | |
18 | #define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1) | |
19 | ||
20 | #define _IOC_NRSHIFT 0 | |
21 | #define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS) | |
22 | #define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS) | |
23 | #define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS) | |
24 | ||
25 | /* | |
26 | * Direction bits _IOC_NONE could be 0, but OSF/1 gives it a bit. | |
27 | * And this turns out useful to catch old ioctl numbers in header | |
28 | * files for us. | |
29 | */ | |
30 | #define _IOC_NONE 1U | |
31 | #define _IOC_READ 2U | |
32 | #define _IOC_WRITE 4U | |
33 | ||
34 | #define _IOC(dir,type,nr,size) \ | |
35 | (((dir) << _IOC_DIRSHIFT) | \ | |
36 | ((type) << _IOC_TYPESHIFT) | \ | |
37 | ((nr) << _IOC_NRSHIFT) | \ | |
38 | ((size) << _IOC_SIZESHIFT)) | |
39 | ||
40 | /* provoke compile error for invalid uses of size argument */ | |
41 | extern unsigned int __invalid_size_argument_for_IOC; | |
42 | #define _IOC_TYPECHECK(t) \ | |
43 | ((sizeof(t) == sizeof(t[1]) && \ | |
44 | sizeof(t) < (1 << _IOC_SIZEBITS)) ? \ | |
45 | sizeof(t) : __invalid_size_argument_for_IOC) | |
46 | ||
47 | /* used to create numbers */ | |
48 | #define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0) | |
49 | #define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size))) | |
50 | #define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size))) | |
51 | #define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size))) | |
52 | #define _IOR_BAD(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size)) | |
53 | #define _IOW_BAD(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size)) | |
54 | #define _IOWR_BAD(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size)) | |
55 | ||
56 | /* used to decode them.. */ | |
57 | #define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) | |
58 | #define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK) | |
59 | #define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK) | |
60 | #define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK) | |
61 | ||
62 | /* various drivers, such as the pcmcia stuff, need these... */ | |
63 | #define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT) | |
64 | #define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT) | |
65 | #define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT) | |
66 | #define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT) | |
67 | #define IOCSIZE_SHIFT (_IOC_SIZESHIFT) | |
68 | ||
a37c8875 | 69 | #endif /* _ASM_POWERPC_IOCTL_H */ |