1 files changed, 24 insertions, 0 deletions
diff --git a/src/include/gpxe/uaccess.h b/src/include/gpxe/uaccess.h
new file mode 100644
index 00000000..38853bfb
--- /dev/null
+++ b/src/include/gpxe/uaccess.h
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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>
+
+#endif /* _GPXE_UACCESS_H */