Add build system scaffolding and libc headers

1 files changed, 109 insertions, 0 deletions

diff --git a/include/arch/x86_64/asm-generic/ioctl.h b/include/arch/x86_64/asm-generic/ioctl.h
new file mode 100644
index 00000000..a512641b
--- /dev/null
+++ b/include/arch/x86_64/asm-generic/ioctl.h
@@ -0,0 +1,109 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _ASM_GENERIC_IOCTL_H
+#define _ASM_GENERIC_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 generic 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
+
+/*
+ * Let any architecture override either of the following before
+ * including this file.
+ */
+
+#ifndef _IOC_SIZEBITS
+#define _IOC_SIZEBITS 14
+#endif
+
+#ifndef _IOC_DIRBITS
+#define _IOC_DIRBITS 2
+#endif
+
+#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, which any architecture can choose to override
+ * before including this file.
+ *
+ * NOTE: _IOC_WRITE means userland is writing and kernel is
+ * reading. _IOC_READ means userland is reading and kernel is writing.
+ */
+
+#ifndef _IOC_NONE
+#define _IOC_NONE 0U
+#endif
+
+#ifndef _IOC_WRITE
+#define _IOC_WRITE 1U
+#endif
+
+#ifndef _IOC_READ
+#define _IOC_READ 2U
+#endif
+
+#define _IOC(dir, type, nr, size)                                \
+	(((dir) << _IOC_DIRSHIFT) | ((type) << _IOC_TYPESHIFT) | \
+	 ((nr) << _IOC_NRSHIFT) | ((size) << _IOC_SIZESHIFT))
+
+#define _IOC_TYPECHECK(t) (sizeof(t))
+
+/*
+ * Used to create numbers.
+ *
+ * NOTE: _IOW means userland is writing and kernel is reading. _IOR
+ * means userland is reading and kernel is writing.
+ */
+#define _IO(type, nr) _IOC(_IOC_NONE, (type), (nr), 0)
+#define _IOR(type, nr, argtype) \
+	_IOC(_IOC_READ, (type), (nr), (_IOC_TYPECHECK(argtype)))
+#define _IOW(type, nr, argtype) \
+	_IOC(_IOC_WRITE, (type), (nr), (_IOC_TYPECHECK(argtype)))
+#define _IOWR(type, nr, argtype) \
+	_IOC(_IOC_READ | _IOC_WRITE, (type), (nr), (_IOC_TYPECHECK(argtype)))
+#define _IOR_BAD(type, nr, argtype) \
+	_IOC(_IOC_READ, (type), (nr), sizeof(argtype))
+#define _IOW_BAD(type, nr, argtype) \
+	_IOC(_IOC_WRITE, (type), (nr), sizeof(argtype))
+#define _IOWR_BAD(type, nr, argtype) \
+	_IOC(_IOC_READ | _IOC_WRITE, (type), (nr), sizeof(argtype))
+
+/* 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 /* _ASM_GENERIC_IOCTL_H */