/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is the Netscape Portable Runtime (NSPR).
 * 
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are 
 * Copyright (C) 1998-2000 Netscape Communications Corporation.  All
 * Rights Reserved.
 * 
 * Contributor(s):
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL"), in which case the provisions of the GPL are applicable 
 * instead of those above.  If you wish to allow use of your 
 * version of this file only under the terms of the GPL and not to
 * allow others to use your version of this file under the MPL,
 * indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by
 * the GPL.  If you do not delete the provisions above, a recipient
 * may use your version of this file under either the MPL or the
 * GPL.
 */

#include "prbit.h"
#include "prsystem.h"

#ifdef XP_UNIX
#include <unistd.h>
#endif
#ifdef SUNOS4
#include "md/sunos4.h"
#endif
#ifdef _WIN32
#include <windows.h>
#endif 
#ifdef XP_BEOS
#include <OS.h>
#endif

PRInt32 _pr_pageShift;
PRInt32 _pr_pageSize;

/*
** Get system page size
*/
static void GetPageSize(void)
{
	PRInt32 pageSize;

    /* Get page size */
#ifdef XP_UNIX
#if defined SUNOS4 || defined LINUX || defined BSDI || defined AIX \
        || defined FREEBSD || defined NETBSD || defined OPENBSD \
        || defined DARWIN || defined NEXTSTEP
    _pr_pageSize = getpagesize();
#elif defined(HPUX)
    /* I have no idea. Don't get me started. --Rob */
    _pr_pageSize = sysconf(_SC_PAGE_SIZE);
#else
    _pr_pageSize = sysconf(_SC_PAGESIZE);
#endif
#endif /* XP_UNIX */

#ifdef XP_MAC
    _pr_pageSize = 4096;
#endif /* XP_MAC */

#ifdef XP_BEOS
    _pr_pageSize = B_PAGE_SIZE;
#endif

#ifdef XP_PC
#ifdef _WIN32
    SYSTEM_INFO info;
    GetSystemInfo(&info);
    _pr_pageSize = info.dwPageSize;
#else
    _pr_pageSize = 4096;
#endif
#endif /* XP_PC */

	pageSize = _pr_pageSize;
	PR_CEILING_LOG2(_pr_pageShift, pageSize);
}

PR_IMPLEMENT(PRInt32) PR_GetPageShift(void)
{
    if (!_pr_pageSize) {
	GetPageSize();
    }
    return _pr_pageShift;
}

PR_IMPLEMENT(PRInt32) PR_GetPageSize(void)
{
    if (!_pr_pageSize) {
	GetPageSize();
    }
    return _pr_pageSize;
}