X-Git-Url: http://pilppa.org/gitweb/?a=blobdiff_plain;f=include%2Fxen%2Finterface%2Fxen.h;h=2befa3e2f1bce59edaddfb25ce1b301aa6e554e3;hb=375614422509c98a1f3dbef410206bf81775169b;hp=819a0331cda9d440fd368f16d38941db371caa8c;hpb=fa6868508a0102b150ca03d976e3a1c234e4e387;p=linux-2.6-omap-h63xx.git

diff --git a/include/xen/interface/xen.h b/include/xen/interface/xen.h
index 819a0331cda..2befa3e2f1b 100644
--- a/include/xen/interface/xen.h
+++ b/include/xen/interface/xen.h
@@ -114,9 +114,14 @@
  * ptr[:2]  -- Machine address within the frame whose mapping to modify.
  *             The frame must belong to the FD, if one is specified.
  * val      -- Value to write into the mapping entry.
+ *
+ * ptr[1:0] == MMU_PT_UPDATE_PRESERVE_AD:
+ * As MMU_NORMAL_PT_UPDATE above, but A/D bits currently in the PTE are ORed
+ * with those in @val.
  */
-#define MMU_NORMAL_PT_UPDATE     0 /* checked '*ptr = val'. ptr is MA.       */
-#define MMU_MACHPHYS_UPDATE      1 /* ptr = MA of frame to modify entry for  */
+#define MMU_NORMAL_PT_UPDATE      0 /* checked '*ptr = val'. ptr is MA.       */
+#define MMU_MACHPHYS_UPDATE       1 /* ptr = MA of frame to modify entry for  */
+#define MMU_PT_UPDATE_PRESERVE_AD 2 /* atomically: *ptr = val | (*ptr&(A|D)) */
 
 /*
  * MMU EXTENDED OPERATIONS