diff options
Diffstat (limited to 'include/asm-s390')
-rw-r--r-- | include/asm-s390/ioctl.h | 89 |
1 files changed, 1 insertions, 88 deletions
diff --git a/include/asm-s390/ioctl.h b/include/asm-s390/ioctl.h index df7394345ac4..b279fe06dfe5 100644 --- a/include/asm-s390/ioctl.h +++ b/include/asm-s390/ioctl.h | |||
@@ -1,88 +1 @@ | |||
1 | /* | #include <asm-generic/ioctl.h> | |
2 | * include/asm-s390/ioctl.h | ||
3 | * | ||
4 | * S390 version | ||
5 | * | ||
6 | * Derived from "include/asm-i386/ioctl.h" | ||
7 | */ | ||
8 | |||
9 | #ifndef _S390_IOCTL_H | ||
10 | #define _S390_IOCTL_H | ||
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 | /* provoke compile error for invalid uses of size argument */ | ||
59 | extern unsigned long __invalid_size_argument_for_IOC; | ||
60 | #define _IOC_TYPECHECK(t) \ | ||
61 | ((sizeof(t) == sizeof(t[1]) && \ | ||
62 | sizeof(t) < (1 << _IOC_SIZEBITS)) ? \ | ||
63 | sizeof(t) : __invalid_size_argument_for_IOC) | ||
64 | |||
65 | /* used to create numbers */ | ||
66 | #define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0) | ||
67 | #define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size))) | ||
68 | #define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size))) | ||
69 | #define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size))) | ||
70 | #define _IOR_BAD(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size)) | ||
71 | #define _IOW_BAD(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size)) | ||
72 | #define _IOWR_BAD(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size)) | ||
73 | |||
74 | /* used to decode ioctl numbers.. */ | ||
75 | #define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) | ||
76 | #define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK) | ||
77 | #define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK) | ||
78 | #define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK) | ||
79 | |||
80 | /* ...and for the drivers/sound files... */ | ||
81 | |||
82 | #define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT) | ||
83 | #define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT) | ||
84 | #define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT) | ||
85 | #define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT) | ||
86 | #define IOCSIZE_SHIFT (_IOC_SIZESHIFT) | ||
87 | |||
88 | #endif /* _S390_IOCTL_H */ | ||