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63 | pj | 1 | /* $Id: ioctl.h,v 1.1 2003-02-28 12:10:00 pj Exp $ |
2 | * |
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3 | * linux/ioctl.h for Linux by H.H. Bergman. |
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4 | */ |
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5 | |||
6 | #ifndef _ASMI386_IOCTL_H |
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7 | #define _ASMI386_IOCTL_H |
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8 | |||
9 | /* ioctl command encoding: 32 bits total, command in lower 16 bits, |
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10 | * size of the parameter structure in the lower 14 bits of the |
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11 | * upper 16 bits. |
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12 | * Encoding the size of the parameter structure in the ioctl request |
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13 | * is useful for catching programs compiled with old versions |
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14 | * and to avoid overwriting user space outside the user buffer area. |
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15 | * The highest 2 bits are reserved for indicating the ``access mode''. |
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16 | * NOTE: This limits the max parameter size to 16kB -1 ! |
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17 | */ |
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18 | |||
19 | /* |
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20 | * The following is for compatibility across the various Linux |
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21 | * platforms. The i386 ioctl numbering scheme doesn't really enforce |
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22 | * a type field. De facto, however, the top 8 bits of the lower 16 |
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23 | * bits are indeed used as a type field, so we might just as well make |
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24 | * this explicit here. Please be sure to use the decoding macros |
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25 | * below from now on. |
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26 | */ |
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27 | #define _IOC_NRBITS 8 |
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28 | #define _IOC_TYPEBITS 8 |
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29 | #define _IOC_SIZEBITS 14 |
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30 | #define _IOC_DIRBITS 2 |
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31 | |||
32 | #define _IOC_NRMASK ((1 << _IOC_NRBITS)-1) |
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33 | #define _IOC_TYPEMASK ((1 << _IOC_TYPEBITS)-1) |
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34 | #define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS)-1) |
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35 | #define _IOC_DIRMASK ((1 << _IOC_DIRBITS)-1) |
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36 | |||
37 | #define _IOC_NRSHIFT 0 |
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38 | #define _IOC_TYPESHIFT (_IOC_NRSHIFT+_IOC_NRBITS) |
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39 | #define _IOC_SIZESHIFT (_IOC_TYPESHIFT+_IOC_TYPEBITS) |
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40 | #define _IOC_DIRSHIFT (_IOC_SIZESHIFT+_IOC_SIZEBITS) |
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41 | |||
42 | /* |
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43 | * Direction bits. |
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44 | */ |
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45 | #define _IOC_NONE 0U |
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46 | #define _IOC_WRITE 1U |
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47 | #define _IOC_READ 2U |
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48 | |||
49 | #define _IOC(dir,type,nr,size) \ |
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50 | (((dir) << _IOC_DIRSHIFT) | \ |
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51 | ((type) << _IOC_TYPESHIFT) | \ |
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52 | ((nr) << _IOC_NRSHIFT) | \ |
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53 | ((size) << _IOC_SIZESHIFT)) |
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54 | |||
55 | /* used to create numbers */ |
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56 | #define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0) |
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57 | #define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size)) |
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58 | #define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size)) |
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59 | #define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size)) |
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60 | |||
61 | /* used to decode ioctl numbers.. */ |
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62 | #define _IOC_DIR(nr) (((nr) >> _IOC_DIRSHIFT) & _IOC_DIRMASK) |
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63 | #define _IOC_TYPE(nr) (((nr) >> _IOC_TYPESHIFT) & _IOC_TYPEMASK) |
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64 | #define _IOC_NR(nr) (((nr) >> _IOC_NRSHIFT) & _IOC_NRMASK) |
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65 | #define _IOC_SIZE(nr) (((nr) >> _IOC_SIZESHIFT) & _IOC_SIZEMASK) |
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66 | |||
67 | /* ...and for the drivers/sound files... */ |
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68 | |||
69 | #define IOC_IN (_IOC_WRITE << _IOC_DIRSHIFT) |
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70 | #define IOC_OUT (_IOC_READ << _IOC_DIRSHIFT) |
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71 | #define IOC_INOUT ((_IOC_WRITE|_IOC_READ) << _IOC_DIRSHIFT) |
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72 | #define IOCSIZE_MASK (_IOC_SIZEMASK << _IOC_SIZESHIFT) |
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73 | #define IOCSIZE_SHIFT (_IOC_SIZESHIFT) |
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74 | |||
75 | #endif /* _ASMI386_IOCTL_H */ |