/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "prbit.h"

#include "prsystem.h"

#ifdef XP_UNIX

#  include <unistd.h>

#endif

#ifdef _WIN32

#  include <windows.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 AIX || defined LINUX || defined __GNU__ || defined __GLIBC__ || \

      defined FREEBSD || defined NETBSD || defined OPENBSD || defined DARWIN

  _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_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;

}