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diff --git a/libitm/config/generic/cachepage.h b/libitm/config/generic/cachepage.h
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+++ b/libitm/config/generic/cachepage.h
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+/* Copyright (C) 2009, 2011 Free Software Foundation, Inc.
+   Contributed by Richard Henderson <rth@redhat.com>.
+
+   This file is part of the GNU Transactional Memory Library (libitm).
+
+   Libitm is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
+   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+   FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+   more details.
+
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef LIBITM_CACHEPAGE_H
+#define LIBITM_CACHEPAGE_H 1
+
+namespace GTM HIDDEN {
+
+// A "page" worth of saved cachelines plus modification masks.  This
+// arrangement is intended to minimize the overhead of alignment.  The
+// PAGE_SIZE defined by the target must be a constant for this to work,
+// which means that this definition may not be the same as the real
+// system page size.  An additional define of FIXED_PAGE_SIZE by the
+// target indicates that PAGE_SIZE exactly matches the system page size.
+
+#ifndef PAGE_SIZE
+#define PAGE_SIZE 4096
+#endif
+
+struct gtm_cacheline_page
+{
+  static const size_t LINES
+    = ((PAGE_SIZE - sizeof(gtm_cacheline_page *))
+       / (CACHELINE_SIZE + sizeof(gtm_cacheline_mask)));
+
+  gtm_cacheline lines[LINES] __attribute__((aligned(PAGE_SIZE)));
+  gtm_cacheline_mask masks[LINES];
+  gtm_cacheline_page *prev;
+
+  static gtm_cacheline_page *
+  page_for_line (gtm_cacheline *c)
+  {
+    return (gtm_cacheline_page *)((uintptr_t)c & -PAGE_SIZE);
+  }
+
+  gtm_cacheline_mask *
+  mask_for_line (gtm_cacheline *c)
+  {
+    size_t index = c - &this->lines[0];
+    return &this->masks[index];
+  }
+
+  static gtm_cacheline_mask *
+  mask_for_page_line (gtm_cacheline *c)
+  {
+    gtm_cacheline_page *p = page_for_line (c);
+    return p->mask_for_line (c);
+  }
+
+  static void *operator new (size_t);
+  static void operator delete (void *);
+};
+
+} // namespace GTM
+
+#endif // LIBITM_CACHEPAGE_H