--- /dev/null
+/*
+ * 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.
+ */
+
+/**
+ * @file
+ * Definitions of page table.
+ */
+#include <string>
+#include <map>
+#include <fstream>
+
+#include "base/bitfield.hh"
+#include "base/intmath.hh"
+#include "base/trace.hh"
+#include "mem/mem_cmd.hh"
+#include "mem/mem_req.hh"
+#include "mem/page_table.hh"
+#include "sim/builder.hh"
+#include "sim/sim_object.hh"
+#include "sim/system.hh"
+
+using namespace std;
+
+PageTable::PageTable(System *_system, Addr _pageSize)
+ : pageSize(_pageSize), offsetMask(mask(FloorLog2(_pageSize))),
+ system(_system)
+{
+ assert(IsPowerOf2(pageSize));
+}
+
+PageTable::~PageTable()
+{
+}
+
+Fault
+PageTable::page_check(Addr addr, int size) const
+{
+ if (size < sizeof(uint64_t)) {
+ if (!IsPowerOf2(size)) {
+ panic("Invalid request size!\n");
+ return Machine_Check_Fault;
+ }
+
+ if ((size - 1) & addr)
+ return Alignment_Fault;
+ }
+ else {
+ if ((addr & (VMPageSize - 1)) + size > VMPageSize) {
+ panic("Invalid request size!\n");
+ return Machine_Check_Fault;
+ }
+
+ if ((sizeof(uint64_t) - 1) & addr)
+ return Alignment_Fault;
+ }
+
+ return No_Fault;
+}
+
+
+
+
+void
+PageTable::allocate(Addr vaddr, int size)
+{
+ // starting address must be page aligned
+ assert(pageOffset(vaddr) == 0);
+
+ for (; size > 0; size -= pageSize, vaddr += pageSize) {
+ std::map<Addr,Addr>::iterator iter = pTable.find(vaddr);
+
+ if (iter != pTable.end()) {
+ // already mapped
+ fatal("PageTable::allocate: address 0x%x already mapped", vaddr);
+ }
+
+ pTable[vaddr] = system->new_page();
+ }
+}
+
+
+
+bool
+PageTable::translate(Addr vaddr, Addr &paddr)
+{
+ Addr page_addr = pageAlign(vaddr);
+ std::map<Addr,Addr>::iterator iter = pTable.find(page_addr);
+
+ if (iter == pTable.end()) {
+ return false;
+ }
+
+ paddr = iter->second + pageOffset(vaddr);
+ return true;
+}
+
+
+Fault
+PageTable::translate(MemReqPtr &req)
+{
+ assert(pageAlign(req->vaddr + req->size - 1) == pageAlign(req->vaddr));
+ if (!translate(req->vaddr, req->paddr)) {
+ return Machine_Check_Fault;
+ }
+ return page_check(req->paddr, req->size);
+}
--- /dev/null
+/*
+ * 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.
+ */
+
+/**
+ * @file
+ * Declaration of a non-full system Page Table.
+ */
+
+#ifndef __PAGE_TABLE__
+#define __PAGE_TABLE__
+
+#include <string>
+#include <map>
+
+#include "base/trace.hh"
+#include "mem/mem_req.hh"
+#include "mem/mem_cmd.hh"
+#include "sim/sim_object.hh"
+
+class System;
+
+/**
+ * Page Table Decleration.
+ */
+class PageTable
+{
+ protected:
+ std::map<Addr,Addr> pTable;
+
+ const Addr pageSize;
+ const Addr offsetMask;
+
+ System *system;
+
+ public:
+
+ PageTable(System *_system, Addr _pageSize = VMPageSize);
+
+ ~PageTable();
+
+ Addr pageAlign(Addr a) { return (a & ~offsetMask); }
+ Addr pageOffset(Addr a) { return (a & offsetMask); }
+
+ Fault page_check(Addr addr, int size) const;
+
+ void allocate(Addr vaddr, int 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(MemReqPtr &req);
+
+};
+
+#endif
projects / gem5.git / commitdiff