| [142] | 1 | /* $Id: ioctl.h 142 2000-04-23 14:55:46Z ktk $
|
|---|
| 2 | *
|
|---|
| 3 | * linux/ioctl.h for Linux by H.H. Bergman.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | #ifndef _ASMI386_IOCTL_H
|
|---|
| 7 | #define _ASMI386_IOCTL_H
|
|---|
| 8 |
|
|---|
| 9 | /* ioctl command encoding: 32 bits total, command in lower 16 bits,
|
|---|
| 10 | * size of the parameter structure in the lower 14 bits of the
|
|---|
| 11 | * upper 16 bits.
|
|---|
| 12 | * Encoding the size of the parameter structure in the ioctl request
|
|---|
| 13 | * is useful for catching programs compiled with old versions
|
|---|
| 14 | * and to avoid overwriting user space outside the user buffer area.
|
|---|
| 15 | * The highest 2 bits are reserved for indicating the ``access mode''.
|
|---|
| 16 | * NOTE: This limits the max parameter size to 16kB -1 !
|
|---|
| 17 | */
|
|---|
| 18 |
|
|---|
| 19 | /*
|
|---|
| 20 | * The following is for compatibility across the various Linux
|
|---|
| 21 | * platforms. The i386 ioctl numbering scheme doesn't really enforce
|
|---|
| 22 | * a type field. De facto, however, the top 8 bits of the lower 16
|
|---|
| 23 | * bits are indeed used as a type field, so we might just as well make
|
|---|
| 24 | * this explicit here. Please be sure to use the decoding macros
|
|---|
| 25 | * below from now on.
|
|---|
| 26 | */
|
|---|
| 27 | #define _IOC_NRBITS 8
|
|---|
| 28 | #define _IOC_TYPEBITS 8
|
|---|
| 29 | #define _IOC_SIZEBITS 14
|
|---|
| 30 | #define _IOC_DIRBITS 2
|
|---|
| 31 |
|
|---|
| 32 | #define _IOC_NRMASK ((1 << _IOC_NRBITS)-1)
|
|---|
| 33 | #define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1)
|
|---|
| 34 | #define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1)
|
|---|
| 35 | #define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1)
|
|---|
| 36 |
|
|---|
| 37 | #define _IOC_NRSHIFT 0
|
|---|
| 38 | #define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS)
|
|---|
| 39 | #define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS)
|
|---|
| 40 | #define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS)
|
|---|
| 41 |
|
|---|
| 42 | /*
|
|---|
| 43 | * Direction bits.
|
|---|
| 44 | */
|
|---|
| 45 | #define _IOC_NONE 0U
|
|---|
| 46 | #define _IOC_WRITE 1U
|
|---|
| 47 | #define _IOC_READ 2U
|
|---|
| 48 |
|
|---|
| 49 | #define _IOC(dir,type,nr,size) \
|
|---|
| 50 | (((dir) << _IOC_DIRSHIFT) | \
|
|---|
| 51 | ((type) << _IOC_TYPESHIFT) | \
|
|---|
| 52 | ((nr) << _IOC_NRSHIFT) | \
|
|---|
| 53 | ((size) << _IOC_SIZESHIFT))
|
|---|
| 54 |
|
|---|
| 55 | /* used to create numbers */
|
|---|
| 56 | #define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0)
|
|---|
| 57 | #define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size))
|
|---|
| 58 | #define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
|
|---|
| 59 | #define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
|
|---|
| 60 |
|
|---|
| 61 | /* used to decode ioctl numbers.. */
|
|---|
| 62 | #define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
|
|---|
| 63 | #define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
|
|---|
| 64 | #define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
|
|---|
| 65 | #define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
|
|---|
| 66 |
|
|---|
| 67 | /* ...and for the drivers/sound files... */
|
|---|
| 68 |
|
|---|
| 69 | #define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT)
|
|---|
| 70 | #define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT)
|
|---|
| 71 | #define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
|
|---|
| 72 | #define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT)
|
|---|
| 73 | #define IOCSIZE_SHIFT (_IOC_SIZESHIFT)
|
|---|
| 74 |
|
|---|
| 75 | #endif /* _ASMI386_IOCTL_H */
|
|---|
