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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
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