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#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 */
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