123456789101112131415161718192021222324252627 |
- #ifndef _GPXE_UACCESS_H
- #define _GPXE_UACCESS_H
-
- /**
- * @file
- *
- * Access to external ("user") memory
- *
- * gPXE often needs to transfer data between internal and external
- * buffers. On i386, the external buffers may require access via a
- * different segment, and the buffer address cannot be encoded into a
- * simple void * pointer. The @c userptr_t type encapsulates the
- * information needed to identify an external buffer, and the
- * copy_to_user() and copy_from_user() functions provide methods for
- * transferring data between internal and external buffers.
- *
- * Note that userptr_t is an opaque type; in particular, performing
- * arithmetic upon a userptr_t is not allowed.
- *
- */
-
- #include <bits/uaccess.h>
-
- /** Equivalent of NULL for user pointers */
- #define UNULL ( ( userptr_t ) 0 )
-
- #endif /* _GPXE_UACCESS_H */
|