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Diffstat (limited to 'src/mem/page_table.hh')
-rw-r--r-- | src/mem/page_table.hh | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/src/mem/page_table.hh b/src/mem/page_table.hh new file mode 100644 index 000000000..fce063280 --- /dev/null +++ b/src/mem/page_table.hh @@ -0,0 +1,100 @@ +/* + * Copyright (c) 2003 The Regents of The University of Michigan + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer; + * 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; + * neither the name of the copyright holders nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * 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 + * OWNER 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. + * + * Authors: Steve Reinhardt + */ + +/** + * @file + * Declaration of a non-full system Page Table. + */ + +#ifndef __PAGE_TABLE__ +#define __PAGE_TABLE__ + +#include <string> + +#include "sim/faults.hh" +#include "arch/isa_traits.hh" +#include "base/hashmap.hh" +#include "base/trace.hh" +#include "mem/request.hh" +#include "mem/packet.hh" +#include "sim/sim_object.hh" + +class System; + +/** + * Page Table Declaration. + */ +class PageTable +{ + protected: + m5::hash_map<Addr,Addr> pTable; + + struct cacheElement { + Addr paddr; + Addr vaddr; + } ; + + struct cacheElement pTableCache[3]; + + const Addr pageSize; + const Addr offsetMask; + + System *system; + + public: + + PageTable(System *_system, Addr _pageSize = TheISA::VMPageSize); + + ~PageTable(); + + Addr pageAlign(Addr a) { return (a & ~offsetMask); } + Addr pageOffset(Addr a) { return (a & offsetMask); } + + Fault page_check(Addr addr, int64_t size) const; + + void allocate(Addr vaddr, int64_t size); + + /** + * Translate function + * @param vaddr The virtual address. + * @return Physical address from translation. + */ + bool translate(Addr vaddr, Addr &paddr); + + /** + * Perform a translation on the memory request, fills in paddr + * field of mem_req. + * @param req The memory request. + */ + Fault translate(RequestPtr &req); + +}; + +#endif |