| 1 |
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| 2 | #ifndef _ALPHA_IOCTL_H
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| 3 | #define _ALPHA_IOCTL_H
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| 4 |
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| 5 | |
| 6 | * The original linux ioctl numbering scheme was just a general
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| 7 | * "anything goes" setup, where more or less random numbers were
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| 8 | * assigned. Sorry, I was clueless when I started out on this.
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| 9 | *
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| 10 | * On the alpha, we'll try to clean it up a bit, using a more sane
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| 11 | * ioctl numbering, and also trying to be compatible with OSF/1 in
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| 12 | * the process. I'd like to clean it up for the i386 as well, but
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| 13 | * it's so painful recognizing both the new and the old numbers..
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| 14 |
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| 15 |
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| 16 | #define _IOC_NRBITS 8
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| 17 | #define _IOC_TYPEBITS 8
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| 18 | #define _IOC_SIZEBITS 13
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| 19 | #define _IOC_DIRBITS 3
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| 20 |
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| 21 | #define _IOC_NRMASK ((1 << _IOC_NRBITS)-1)
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| 22 | #define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1)
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| 23 | #define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1)
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| 24 | #define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1)
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| 25 |
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| 26 | #define _IOC_NRSHIFT 0
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| 27 | #define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS)
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| 28 | #define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS)
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| 29 | #define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS)
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| 30 |
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| 31 | |
| 32 | * Direction bits _IOC_NONE could be 0, but OSF/1 gives it a bit.
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| 33 | * And this turns out useful to catch old ioctl numbers in header
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| 34 | * files for us.
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| 35 |
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| 36 | #define _IOC_NONE 1U
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| 37 | #define _IOC_READ 2U
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| 38 | #define _IOC_WRITE 4U
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| 39 |
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| 40 | #define _IOC(dir,type,nr,size) \
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| 41 | ((unsigned int) \
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| 42 | (((dir) << _IOC_DIRSHIFT) | \
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| 43 | ((type) << _IOC_TYPESHIFT) | \
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| 44 | ((nr) << _IOC_NRSHIFT) | \
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| 45 | ((size) << _IOC_SIZESHIFT)))
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| 46 |
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| 47 |
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| 48 | #define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0)
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| 49 | #define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size))
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| 50 | #define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
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| 51 | #define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
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| 52 |
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| 53 |
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| 54 | #define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
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| 55 | #define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
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| 56 | #define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
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| 57 | #define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
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| 58 |
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| 59 |
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| 60 |
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| 61 | #define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT)
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| 62 | #define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT)
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| 63 | #define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
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| 64 | #define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT)
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| 65 | #define IOCSIZE_SHIFT (_IOC_SIZESHIFT)
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| 66 |
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| 67 | #endif
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