/* protan.c: ANSI MEMORY PROTECTION
 *
 * $Id$
 * Copyright (c) 2001-2015 Ravenbrook Limited.  See end of file for license.
 *
 *
 * DESIGN
 *
 * <design/protan/>
 */

#include "mpm.h"

SRCID(protan, "$Id$");


/* ProtSetup -- global protection setup */

void ProtSetup(void)
{
  NOOP;
}


/* ProtGranularity -- return the granularity of protection */

Size ProtGranularity(void)
{
  /* Any range of addresses can be "protected" since ProtSet does nothing. */
  return (Size)MPS_PF_ALIGN;
}


/* ProtSet -- set the protection for a page */

void ProtSet(Addr base, Addr limit, AccessSet pm)
{
  AVER(base < limit);
  AVERT(AccessSet, pm);
  UNUSED(pm);
  NOOP;
}


/* ProtSync -- synchronize protection settings with hardware
 *
 * See <design/protan/#fun.sync>.
 */

void ProtSync(Arena arena)
{
  Bool synced;

  AVERT(Arena, arena);

  do {
    Seg seg;

    synced = TRUE;
    if (SegFirst(&seg, arena)) {
      do {
        if (SegPM(seg) != AccessSetEMPTY) { /* <design/protan/#fun.sync.seg> */
          ShieldEnter(arena);
          TraceSegAccess(arena, seg, SegPM(seg));
          ShieldLeave(arena);
          synced = FALSE;
        }
      } while(SegNext(&seg, arena, seg));
    }
  } while(!synced);
}


/* C. COPYRIGHT AND LICENSE
 *
 * Copyright (C) 2001-2015 Ravenbrook Limited <http://www.ravenbrook.com/>.
 * All rights reserved.  This is an open source license.  Contact
 * Ravenbrook for commercial licensing options.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 
 * 2. 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.
 * 
 * 3. Redistributions in any form must be accompanied by information on how
 * to obtain complete source code for this software and any accompanying
 * software that uses this software.  The source code must either be
 * included in the distribution or be available for no more than the cost
 * of distribution plus a nominal fee, and must be freely redistributable
 * under reasonable conditions.  For an executable file, complete source
 * code means the source code for all modules it contains. It does not
 * include source code for modules or files that typically accompany the
 * major components of the operating system on which the executable file
 * runs.
 * 
 * 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, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS AND 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.
 */