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-rw-r--r--include/asm-s390/ioctl.h88
1 files changed, 88 insertions, 0 deletions
diff --git a/include/asm-s390/ioctl.h b/include/asm-s390/ioctl.h
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+++ b/include/asm-s390/ioctl.h
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+/*
+ * include/asm-s390/ioctl.h
+ *
+ * S390 version
+ *
+ * Derived from "include/asm-i386/ioctl.h"
+ */
+
+#ifndef _S390_IOCTL_H
+#define _S390_IOCTL_H
+
+/* ioctl command encoding: 32 bits total, command in lower 16 bits,
+ * size of the parameter structure in the lower 14 bits of the
+ * upper 16 bits.
+ * Encoding the size of the parameter structure in the ioctl request
+ * is useful for catching programs compiled with old versions
+ * and to avoid overwriting user space outside the user buffer area.
+ * The highest 2 bits are reserved for indicating the ``access mode''.
+ * NOTE: This limits the max parameter size to 16kB -1 !
+ */
+
+/*
+ * The following is for compatibility across the various Linux
+ * platforms. The i386 ioctl numbering scheme doesn't really enforce
+ * a type field. De facto, however, the top 8 bits of the lower 16
+ * bits are indeed used as a type field, so we might just as well make
+ * this explicit here. Please be sure to use the decoding macros
+ * below from now on.
+ */
+#define _IOC_NRBITS 8
+#define _IOC_TYPEBITS 8
+#define _IOC_SIZEBITS 14
+#define _IOC_DIRBITS 2
+
+#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.
+ */
+#define _IOC_NONE 0U
+#define _IOC_WRITE 1U
+#define _IOC_READ 2U
+
+#define _IOC(dir,type,nr,size) \
+ (((dir) << _IOC_DIRSHIFT) | \
+ ((type) << _IOC_TYPESHIFT) | \
+ ((nr) << _IOC_NRSHIFT) | \
+ ((size) << _IOC_SIZESHIFT))
+
+/* provoke compile error for invalid uses of size argument */
+extern unsigned long __invalid_size_argument_for_IOC;
+#define _IOC_TYPECHECK(t) \
+ ((sizeof(t) == sizeof(t[1]) && \
+ sizeof(t) < (1 << _IOC_SIZEBITS)) ? \
+ sizeof(t) : __invalid_size_argument_for_IOC)
+
+/* used to create numbers */
+#define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0)
+#define _IOR(type,nr,size) _IOC(_IOC_READ,(type),(nr),(_IOC_TYPECHECK(size)))
+#define _IOW(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
+#define _IOWR(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),(_IOC_TYPECHECK(size)))
+#define _IOR_BAD(type,nr,size) _IOC(_IOC_READ,(type),(nr),sizeof(size))
+#define _IOW_BAD(type,nr,size) _IOC(_IOC_WRITE,(type),(nr),sizeof(size))
+#define _IOWR_BAD(type,nr,size) _IOC(_IOC_READ|_IOC_WRITE,(type),(nr),sizeof(size))
+
+/* used to decode ioctl numbers.. */
+#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 /* _S390_IOCTL_H */