Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/include/asm-m32r/ioctl.h
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Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
File MIME type: text/plain
File size: 2617 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | #ifndef _ASM_M32R_IOCTL_H |
2 | #define _ASM_M32R_IOCTL_H |
3 | |
4 | /* $Id$ */ |
5 | |
6 | /* orig : i386 2.4.18 */ |
7 | |
8 | /* |
9 | * linux/ioctl.h for Linux by H.H. Bergman. |
10 | */ |
11 | |
12 | /* ioctl command encoding: 32 bits total, command in lower 16 bits, |
13 | * size of the parameter structure in the lower 14 bits of the |
14 | * upper 16 bits. |
15 | * Encoding the size of the parameter structure in the ioctl request |
16 | * is useful for catching programs compiled with old versions |
17 | * and to avoid overwriting user space outside the user buffer area. |
18 | * The highest 2 bits are reserved for indicating the ``access mode''. |
19 | * NOTE: This limits the max parameter size to 16kB -1 ! |
20 | */ |
21 | |
22 | /* |
23 | * The following is for compatibility across the various Linux |
24 | * platforms. The i386 ioctl numbering scheme doesn't really enforce |
25 | * a type field. De facto, however, the top 8 bits of the lower 16 |
26 | * bits are indeed used as a type field, so we might just as well make |
27 | * this explicit here. Please be sure to use the decoding macros |
28 | * below from now on. |
29 | */ |
30 | #define _IOC_NRBITS 8 |
31 | #define _IOC_TYPEBITS 8 |
32 | #define _IOC_SIZEBITS 14 |
33 | #define _IOC_DIRBITS 2 |
34 | |
35 | #define _IOC_NRMASK ((1 << _IOC_NRBITS)-1) |
36 | #define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1) |
37 | #define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1) |
38 | #define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1) |
39 | |
40 | #define _IOC_NRSHIFT 0 |
41 | #define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS) |
42 | #define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS) |
43 | #define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS) |
44 | |
45 | /* |
46 | * Direction bits. |
47 | */ |
48 | #define _IOC_NONE 0U |
49 | #define _IOC_WRITE 1U |
50 | #define _IOC_READ 2U |
51 | |
52 | #define _IOC(dir,type,nr,size) \ |
53 | (((dir) << _IOC_DIRSHIFT) | \ |
54 | ((type) << _IOC_TYPESHIFT) | \ |
55 | ((nr) << _IOC_NRSHIFT) | \ |
56 | ((size) << _IOC_SIZESHIFT)) |
57 | |
58 | /* used to create numbers */ |
59 | #define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0) |
60 | #define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size)) |
61 | #define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size)) |
62 | #define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size)) |
63 | |
64 | /* used to decode ioctl numbers.. */ |
65 | #define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) |
66 | #define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK) |
67 | #define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK) |
68 | #define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK) |
69 | |
70 | /* ...and for the drivers/sound files... */ |
71 | |
72 | #define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT) |
73 | #define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT) |
74 | #define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT) |
75 | #define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT) |
76 | #define IOCSIZE_SHIFT (_IOC_SIZESHIFT) |
77 | |
78 | #endif /* _ASM_M32R_IOCTL_H */ |