mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 21:54:06 +08:00
67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
|
#ifndef _ALPHA_IOCTL_H
|
||
|
|
#define _ALPHA_IOCTL_H
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The original linux ioctl numbering scheme was just a general
|
||
|
|
* "anything goes" setup, where more or less random numbers were
|
||
|
|
* assigned. Sorry, I was clueless when I started out on this.
|
||
|
|
*
|
||
|
|
* On the alpha, we'll try to clean it up a bit, using a more sane
|
||
|
|
* ioctl numbering, and also trying to be compatible with OSF/1 in
|
||
|
|
* the process. I'd like to clean it up for the i386 as well, but
|
||
|
|
* it's so painful recognizing both the new and the old numbers..
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define _IOC_NRBITS 8
|
||
|
|
#define _IOC_TYPEBITS 8
|
||
|
|
#define _IOC_SIZEBITS 13
|
||
|
|
#define _IOC_DIRBITS 3
|
||
|
|
|
||
|
|
#define _IOC_NRMASK ((1 << _IOC_NRBITS)-1)
|
||
|
|
#define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1)
|
||
|
|
#define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1)
|
||
|
|
#define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1)
|
||
|
|
|
||
|
|
#define _IOC_NRSHIFT 0
|
||
|
|
#define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS)
|
||
|
|
#define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS)
|
||
|
|
#define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS)
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Direction bits _IOC_NONE could be 0, but OSF/1 gives it a bit.
|
||
|
|
* And this turns out useful to catch old ioctl numbers in header
|
||
|
|
* files for us.
|
||
|
|
*/
|
||
|
|
#define _IOC_NONE 1U
|
||
|
|
#define _IOC_READ 2U
|
||
|
|
#define _IOC_WRITE 4U
|
||
|
|
|
||
|
|
#define _IOC(dir,type,nr,size) \
|
||
|
|
((unsigned int) \
|
||
|
|
(((dir) << _IOC_DIRSHIFT) | \
|
||
|
|
((type) << _IOC_TYPESHIFT) | \
|
||
|
|
((nr) << _IOC_NRSHIFT) | \
|
||
|
|
((size) << _IOC_SIZESHIFT)))
|
||
|
|
|
||
|
|
/* used to create numbers */
|
||
|
|
#define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0)
|
||
|
|
#define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size))
|
||
|
|
#define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
|
||
|
|
#define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
|
||
|
|
|
||
|
|
/* used to decode them.. */
|
||
|
|
#define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK)
|
||
|
|
#define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK)
|
||
|
|
#define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK)
|
||
|
|
#define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK)
|
||
|
|
|
||
|
|
/* ...and for the drivers/sound files... */
|
||
|
|
|
||
|
|
#define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT)
|
||
|
|
#define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT)
|
||
|
|
#define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT)
|
||
|
|
#define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT)
|
||
|
|
#define IOCSIZE_SHIFT (_IOC_SIZESHIFT)
|
||
|
|
|
||
|
|
#endif /* _ALPHA_IOCTL_H */
|