/*
 * page.h:  definitions for page size/mask/shift/etc.
 *
 * Copyright (c) 2010, Intel Corporation
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
 *   * Neither the name of the Intel Corporation nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef __PAGE_H__
#define __PAGE_H__

/* From http://fxr.watson.org/fxr/source/i386/include/param.h */
#define PAGE_SHIFT       12                 /* LOG2(PAGE_SIZE) */
#define PAGE_SIZE        (1 << PAGE_SHIFT)  /* bytes/page */
/* PAGE_MASK is used to pass bits 12 and above. */
#define PAGE_MASK        (~(PAGE_SIZE-1))

/* This is used to address the L2's 4MB pages */
/* From figure 4-3 of IA64/IA32 Arch SDM vol 3A */
#define FOURMB_PAGE_SHIFT 22

/* macros to rounds things up/down to a page/pfn */
#define PAGE_UP(p)   (((unsigned long long)(p) + PAGE_SIZE- 1) & PAGE_MASK)
#define PAGE_DOWN(p) ((unsigned long long)(p) & PAGE_MASK)
#define PFN_DOWN(x)   ((x) >> PAGE_SHIFT)
#define PFN_UP(x)     (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)

#endif    /* __PAGE_H__ */


/*
 * Local variables:
 * mode: C
 * c-set-style: "BSD"
 * c-basic-offset: 4
 * tab-width: 4
 * indent-tabs-mode: nil
 * End:
 */