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101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/* protan.c: ANSI MEMORY PROTECTION
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*
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* $Id$
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* Copyright (c) 2001-2020 Ravenbrook Limited. See end of file for license.
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*
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*
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* DESIGN
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*
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* <design/protan>
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*/
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#include "mpm.h"
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SRCID(protan, "$Id$");
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/* ProtSetup -- global protection setup */
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void ProtSetup(void)
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{
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NOOP;
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}
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/* ProtGranularity -- return the granularity of protection */
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Size ProtGranularity(void)
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{
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/* Any range of addresses can be "protected" since ProtSet does nothing. */
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return (Size)MPS_PF_ALIGN;
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}
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/* ProtSet -- set the protection for a page */
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void ProtSet(Addr base, Addr limit, AccessSet pm)
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{
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AVER(base < limit);
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AVERT(AccessSet, pm);
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UNUSED(pm);
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NOOP;
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}
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/* ProtSync -- synchronize protection settings with hardware
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*
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* <design/protan#.fun.sync>.
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*/
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void ProtSync(Arena arena)
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{
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Bool synced;
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AVERT(Arena, arena);
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do {
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Seg seg;
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synced = TRUE;
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if (SegFirst(&seg, arena)) {
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do {
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if (SegPM(seg) != AccessSetEMPTY) { /* <design/protan#.fun.sync.seg> */
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ShieldEnter(arena);
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TraceSegAccess(arena, seg, SegPM(seg));
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ShieldLeave(arena);
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synced = FALSE;
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}
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} while(SegNext(&seg, arena, seg));
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}
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} while(!synced);
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}
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/* C. COPYRIGHT AND LICENSE
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*
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* Copyright (C) 2001-2020 Ravenbrook Limited <https://www.ravenbrook.com/>.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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