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Diffstat (limited to 'include/asm-ia64/ioctl.h')
-rw-r--r-- | include/asm-ia64/ioctl.h | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/include/asm-ia64/ioctl.h b/include/asm-ia64/ioctl.h new file mode 100644 index 000000000000..be9cc2403d2a --- /dev/null +++ b/include/asm-ia64/ioctl.h | |||
@@ -0,0 +1,77 @@ | |||
1 | #ifndef _ASM_IA64_IOCTL_H | ||
2 | #define _ASM_IA64_IOCTL_H | ||
3 | |||
4 | /* | ||
5 | * Based on <asm-i386/ioctl.h>. | ||
6 | * | ||
7 | * Modified 1998, 1999 | ||
8 | * David Mosberger-Tang <davidm@hpl.hp.com>, Hewlett-Packard Co | ||
9 | */ | ||
10 | |||
11 | /* ioctl command encoding: 32 bits total, command in lower 16 bits, | ||
12 | * size of the parameter structure in the lower 14 bits of the | ||
13 | * upper 16 bits. | ||
14 | * Encoding the size of the parameter structure in the ioctl request | ||
15 | * is useful for catching programs compiled with old versions | ||
16 | * and to avoid overwriting user space outside the user buffer area. | ||
17 | * The highest 2 bits are reserved for indicating the ``access mode''. | ||
18 | * NOTE: This limits the max parameter size to 16kB -1 ! | ||
19 | */ | ||
20 | |||
21 | /* | ||
22 | * The following is for compatibility across the various Linux | ||
23 | * platforms. The ia64 ioctl numbering scheme doesn't really enforce | ||
24 | * a type field. De facto, however, the top 8 bits of the lower 16 | ||
25 | * bits are indeed used as a type field, so we might just as well make | ||
26 | * this explicit here. Please be sure to use the decoding macros | ||
27 | * below from now on. | ||
28 | */ | ||
29 | #define _IOC_NRBITS 8 | ||
30 | #define _IOC_TYPEBITS 8 | ||
31 | #define _IOC_SIZEBITS 14 | ||
32 | #define _IOC_DIRBITS 2 | ||
33 | |||
34 | #define _IOC_NRMASK ((1 << _IOC_NRBITS)-1) | ||
35 | #define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1) | ||
36 | #define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1) | ||
37 | #define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1) | ||
38 | |||
39 | #define _IOC_NRSHIFT 0 | ||
40 | #define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS) | ||
41 | #define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS) | ||
42 | #define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS) | ||
43 | |||
44 | /* | ||
45 | * Direction bits. | ||
46 | */ | ||
47 | #define _IOC_NONE 0U | ||
48 | #define _IOC_WRITE 1U | ||
49 | #define _IOC_READ 2U | ||
50 | |||
51 | #define _IOC(dir,type,nr,size) \ | ||
52 | (((dir) << _IOC_DIRSHIFT) | \ | ||
53 | ((type) << _IOC_TYPESHIFT) | \ | ||
54 | ((nr) << _IOC_NRSHIFT) | \ | ||
55 | ((size) << _IOC_SIZESHIFT)) | ||
56 | |||
57 | /* used to create numbers */ | ||
58 | #define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0) | ||
59 | #define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size)) | ||
60 | #define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size)) | ||
61 | #define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size)) | ||
62 | |||
63 | /* used to decode ioctl numbers.. */ | ||
64 | #define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) | ||
65 | #define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK) | ||
66 | #define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK) | ||
67 | #define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK) | ||
68 | |||
69 | /* ...and for the drivers/sound files... */ | ||
70 | |||
71 | #define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT) | ||
72 | #define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT) | ||
73 | #define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT) | ||
74 | #define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT) | ||
75 | #define IOCSIZE_SHIFT (_IOC_SIZESHIFT) | ||
76 | |||
77 | #endif /* _ASM_IA64_IOCTL_H */ | ||