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6 #ifndef _LINUX_IOCTL_H
7 #define _LINUX_IOCTL_H
8
9 #include <asm/page.h>
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20
21 #define IOC_VOID 0x00000000
22 #define IOC_IN 0x40000000
23 #define IOC_OUT 0x80000000
24 #define IOC_INOUT (IOC_IN | IOC_OUT)
25 #define IOCSIZE_MASK 0x3fff0000
26 #define IOCSIZE_SHIFT 16
27 #define IOCSIZE_MAX ((PAGE_SIZE-1)&(IOCSIZE_MASK >> IOCSIZE_SHIFT))
28 #define IOCCMD_MASK 0x0000ffff
29 #define IOCCMD_SHIFT 0
30 #define IOCPARM_MASK IOCCMD_MASK
31 #define IOCPARM_SHIFT IOCCMD_SHIFT
32
33 #define IOC_SIZE(cmd) (((cmd) & IOCSIZE_MASK) >> IOCSIZE_SHIFT)
34 #define IOCBASECMD(cmd) ((cmd) & ~IOCPARM_MASK)
35 #define IOCGROUP(cmd) (((cmd) >> 8) & 0xFF)
36
37 #ifndef _IO
38
39
40
41 #define _IO(c,d) (IOC_VOID | ((c)<<8) | (d))
42 #endif
43
44 #ifndef _IOW
45
46
47
48 #define _IOW(c,d,t) (IOC_IN | ((sizeof(t)<<16) & IOCSIZE_MASK) | \
49 ((c)<<8) | (d))
50 #define _IOR(c,d,t) (IOC_OUT | ((sizeof(t)<<16) & IOCSIZE_MASK) | \
51 ((c)<<8) | (d))
52
53 #define _IOWR(c,d,t) (IOC_INOUT | ((sizeof(t)<<16) & IOCSIZE_MASK) | \
54 ((c)<<8) | (d))
55 #endif
56
57 #endif
58