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/* protan.c: ANSI MEMORY PROTECTION
*
* $Id$
* Copyright (c) 2001-2020 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
*
* <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) 2001-2020 Ravenbrook Limited <https://www.ravenbrook.com/>.
*
* 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.
*
* 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
* HOLDER 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.
*/
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