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From: Rui Paulo <rpaulo@FreeBSD.org>
Date: Tue, 6 Jul 2010 16:56:27 +0000 (UTC)
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Subject: svn commit: r209731 - head/sys/amd64/include
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Author: rpaulo
Date: Tue Jul  6 16:56:27 2010
New Revision: 209731
URL: http://svn.freebsd.org/changeset/base/209731

Log:
  Introduce USD_{SET,GET}{BASE,LIMIT}. These help setting up the user
  segment descriptor hi and lo values. Idea from Solaris.
  
  Reviewed by:	kib

Modified:
  head/sys/amd64/include/segments.h

Modified: head/sys/amd64/include/segments.h
==============================================================================
--- head/sys/amd64/include/segments.h	Tue Jul  6 16:55:39 2010	(r209730)
+++ head/sys/amd64/include/segments.h	Tue Jul  6 16:56:27 2010	(r209731)
@@ -74,6 +74,13 @@ struct	user_segment_descriptor {
 	u_int64_t sd_hibase:8;		/* segment base address  (msb) */
 } __packed;
 
+#define USD_GETBASE(_sd)	(((_sd)->sd_lobase) | (_sd)->sd_hibase << 24) 
+#define USD_SETBASE(_sd, _b)	(_sd)->sd_lobase = (_b); 	\
+				(_sd)->sd_hibase = ((_b) >> 24);
+#define USD_GETLIMIT(_sd)	(((_sd)->sd_lolimit) | (_sd)->sd_hilimit << 16)
+#define USD_SETLIMIT(_sd, _l)	(_sd)->sd_lolimit = (_l);	\
+				(_sd)->sd_hilimit = ((_l) >> 16);
+
 /*
  * System segment descriptors (128 bit wide)
  */