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1 | /* |
2 | * Linux/PA-RISC Project (http://www.parisc-linux.org/) | |
3 | * Copyright (C) 1999,2003 Matthew Wilcox < willy at debian . org > | |
4 | * portions from "linux/ioctl.h for Linux" by H.H. Bergman. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
20 | ||
21 | ||
22 | #ifndef _ASM_PARISC_IOCTL_H | |
23 | #define _ASM_PARISC_IOCTL_H | |
24 | ||
25 | /* ioctl command encoding: 32 bits total, command in lower 16 bits, | |
26 | * size of the parameter structure in the lower 14 bits of the | |
27 | * upper 16 bits. | |
28 | * Encoding the size of the parameter structure in the ioctl request | |
29 | * is useful for catching programs compiled with old versions | |
30 | * and to avoid overwriting user space outside the user buffer area. | |
31 | * The highest 2 bits are reserved for indicating the ``access mode''. | |
32 | * NOTE: This limits the max parameter size to 16kB -1 ! | |
33 | */ | |
34 | ||
35 | #define _IOC_NRBITS 8 | |
36 | #define _IOC_TYPEBITS 8 | |
37 | #define _IOC_SIZEBITS 14 | |
38 | #define _IOC_DIRBITS 2 | |
39 | ||
40 | #define _IOC_NRMASK ((1 << _IOC_NRBITS)-1) | |
41 | #define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1) | |
42 | #define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1) | |
43 | #define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1) | |
44 | ||
45 | #define _IOC_NRSHIFT 0 | |
46 | #define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS) | |
47 | #define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS) | |
48 | #define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS) | |
49 | ||
50 | /* | |
51 | * Direction bits. | |
52 | */ | |
53 | #define _IOC_NONE 0U | |
54 | #define _IOC_WRITE 2U | |
55 | #define _IOC_READ 1U | |
56 | ||
57 | #define _IOC(dir,type,nr,size) \ | |
58 | (((dir) << _IOC_DIRSHIFT) | \ | |
59 | ((type) << _IOC_TYPESHIFT) | \ | |
60 | ((nr) << _IOC_NRSHIFT) | \ | |
61 | ((size) << _IOC_SIZESHIFT)) | |
62 | ||
63 | /* provoke compile error for invalid uses of size argument */ | |
64 | extern unsigned int __invalid_size_argument_for_IOC; | |
65 | #define _IOC_TYPECHECK(t) \ | |
66 | ((sizeof(t) == sizeof(t[1]) && \ | |
67 | sizeof(t) < (1 << _IOC_SIZEBITS)) ? \ | |
68 | sizeof(t) : __invalid_size_argument_for_IOC) | |
69 | ||
70 | /* used to create numbers */ | |
71 | #define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0) | |
72 | #define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size))) | |
73 | #define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size))) | |
74 | #define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size))) | |
75 | #define _IOR_BAD(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size)) | |
76 | #define _IOW_BAD(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size)) | |
77 | #define _IOWR_BAD(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size)) | |
78 | ||
79 | /* used to decode ioctl numbers.. */ | |
80 | #define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) | |
81 | #define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK) | |
82 | #define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK) | |
83 | #define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK) | |
84 | ||
85 | /* ...and for the drivers/sound files... */ | |
86 | ||
87 | #define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT) | |
88 | #define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT) | |
89 | #define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT) | |
90 | #define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT) | |
91 | #define IOCSIZE_SHIFT (_IOC_SIZESHIFT) | |
92 | ||
93 | #endif /* _ASM_PARISC_IOCTL_H */ |