82173212ee
size field. The TIOCSFON ioctl size (8192) didn't get encoded properly, as there weren't enough bits for it (12) in the regular format. The new format has only one type field, and an extra flag (_IOC_BIG) turned on. FS checks for this flag and uses the alternative decoding of the ioctl codes to determine the size when doing grants. This unbreaks loadfont, although that still uses a phys copy in tty.
68 lines
2.1 KiB
C
Executable file
68 lines
2.1 KiB
C
Executable file
/* minix/ioctl.h - Ioctl helper definitions. Author: Kees J. Bot
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* 23 Nov 2002
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*
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* This file is included by every header file that defines ioctl codes.
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*/
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#ifndef _M_IOCTL_H
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#define _M_IOCTL_H
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#ifndef _TYPES_H
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#include <sys/types.h>
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#endif
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#if _EM_WSIZE >= 4
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/* Ioctls have the command encoded in the low-order word, and the size
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* of the parameter in the high-order word. The 3 high bits of the high-
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* order word are used to encode the in/out/void status of the parameter.
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*/
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#define _IOCPARM_MASK 0x0FFF
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#define _IOCPARM_MASK_BIG 0x0FFFFF
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#define _IOC_VOID 0x20000000
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#define _IOCTYPE_MASK 0xFFFF
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#define _IOC_IN 0x40000000
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#define _IOC_OUT 0x80000000
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#define _IOC_INOUT (_IOC_IN | _IOC_OUT)
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/* Flag indicating ioctl format with only one type field, and more bits
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* for the size field (using mask _IOCPARM_MASK_BIG).
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*/
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#define _IOC_BIG 0x10000000
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#define _IO(x,y) ((x << 8) | y | _IOC_VOID)
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#define _IOR(x,y,t) ((x << 8) | y | ((sizeof(t) & _IOCPARM_MASK) << 16) |\
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_IOC_OUT)
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#define _IOW(x,y,t) ((x << 8) | y | ((sizeof(t) & _IOCPARM_MASK) << 16) |\
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_IOC_IN)
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#define _IORW(x,y,t) ((x << 8) | y | ((sizeof(t) & _IOCPARM_MASK) << 16) |\
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_IOC_INOUT)
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#define _IOW_BIG(y,t) (y | ((sizeof(t) & _IOCPARM_MASK_BIG) << 8) \
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| _IOC_IN | _IOC_BIG)
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#define _IOR_BIG(y,t) (y | ((sizeof(t) & _IOCPARM_MASK_BIG) << 8) \
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| _IOC_OUT | _IOC_BIG)
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#define _IORW_BIG(y,t) (y | ((sizeof(t) & _IOCPARM_MASK_BIG) << 8) \
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| _IOC_INOUT | _IOC_BIG)
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/* Decode an ioctl call. */
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#define _MINIX_IOCTL_SIZE(i) (((i) >> 16) & _IOCPARM_MASK)
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#define _MINIX_IOCTL_IOR(i) ((i) & _IOC_OUT)
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#define _MINIX_IOCTL_IORW(i) ((i) & _IOC_INOUT)
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#define _MINIX_IOCTL_IOW(i) ((i) & _IOC_IN)
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/* Recognize and decode size of a 'big' ioctl call. */
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#define _MINIX_IOCTL_BIG(i) ((i) & _IOC_BIG)
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#define _MINIX_IOCTL_SIZE_BIG(i) (((i) >> 8) & _IOCPARM_MASK_BIG)
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#else
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/* No fancy encoding on a 16-bit machine. */
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#define _IO(x,y) ((x << 8) | y)
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#define _IOR(x,y,t) _IO(x,y)
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#define _IOW(x,y,t) _IO(x,y)
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#define _IORW(x,y,t) _IO(x,y)
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#endif
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int ioctl(int _fd, int _request, void *_data);
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#endif /* _M_IOCTL_H */
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