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107 lines
3.4 KiB
107 lines
3.4 KiB
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
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#ifndef _UAPI_ASM_GENERIC_IOCTL_H |
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#define _UAPI_ASM_GENERIC_IOCTL_H |
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/* ioctl command encoding: 32 bits total, command in lower 16 bits, |
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* size of the parameter structure in the lower 14 bits of the |
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* upper 16 bits. |
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* Encoding the size of the parameter structure in the ioctl request |
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* is useful for catching programs compiled with old versions |
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* and to avoid overwriting user space outside the user buffer area. |
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* The highest 2 bits are reserved for indicating the ``access mode''. |
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* NOTE: This limits the max parameter size to 16kB -1 ! |
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*/ |
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/* |
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* The following is for compatibility across the various Linux |
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* platforms. The generic ioctl numbering scheme doesn't really enforce |
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* a type field. De facto, however, the top 8 bits of the lower 16 |
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* bits are indeed used as a type field, so we might just as well make |
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* this explicit here. Please be sure to use the decoding macros |
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* below from now on. |
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*/ |
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#define _IOC_NRBITS 8 |
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#define _IOC_TYPEBITS 8 |
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/* |
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* Let any architecture override either of the following before |
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* including this file. |
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*/ |
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#ifndef _IOC_SIZEBITS |
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# define _IOC_SIZEBITS 14 |
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#endif |
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#ifndef _IOC_DIRBITS |
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# define _IOC_DIRBITS 2 |
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#endif |
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#define _IOC_NRMASK ((1 << _IOC_NRBITS)-1) |
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#define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1) |
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#define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1) |
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#define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1) |
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#define _IOC_NRSHIFT 0 |
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#define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS) |
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#define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS) |
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#define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS) |
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/* |
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* Direction bits, which any architecture can choose to override |
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* before including this file. |
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* |
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* NOTE: _IOC_WRITE means userland is writing and kernel is |
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* reading. _IOC_READ means userland is reading and kernel is writing. |
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*/ |
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#ifndef _IOC_NONE |
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# define _IOC_NONE 0U |
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#endif |
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#ifndef _IOC_WRITE |
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# define _IOC_WRITE 1U |
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#endif |
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#ifndef _IOC_READ |
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# define _IOC_READ 2U |
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#endif |
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#define _IOC(dir,type,nr,size) \ |
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(((dir) << _IOC_DIRSHIFT) | \ |
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((type) << _IOC_TYPESHIFT) | \ |
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((nr) << _IOC_NRSHIFT) | \ |
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((size) << _IOC_SIZESHIFT)) |
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#ifndef __KERNEL__ |
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#define _IOC_TYPECHECK(t) (sizeof(t)) |
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#endif |
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/* |
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* Used to create numbers. |
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* |
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* NOTE: _IOW means userland is writing and kernel is reading. _IOR |
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* means userland is reading and kernel is writing. |
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*/ |
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#define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0) |
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#define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size))) |
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#define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size))) |
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#define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size))) |
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#define _IOR_BAD(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size)) |
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#define _IOW_BAD(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size)) |
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#define _IOWR_BAD(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size)) |
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/* used to decode ioctl numbers.. */ |
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#define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) |
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#define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK) |
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#define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK) |
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#define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK) |
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/* ...and for the drivers/sound files... */ |
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#define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT) |
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#define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT) |
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#define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT) |
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#define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT) |
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#define IOCSIZE_SHIFT (_IOC_SIZESHIFT) |
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#endif /* _UAPI_ASM_GENERIC_IOCTL_H */
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