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Diffstat (limited to 'src/arch/x86/pagetable_walker.hh')
| -rw-r--r-- | src/arch/x86/pagetable_walker.hh | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/src/arch/x86/pagetable_walker.hh b/src/arch/x86/pagetable_walker.hh new file mode 100644 index 000000000..324f16f3c --- /dev/null +++ b/src/arch/x86/pagetable_walker.hh @@ -0,0 +1,189 @@ +/* + * Copyright (c) 2007 The Hewlett-Packard Development Company + * All rights reserved. + * + * Redistribution and use of this software in source and binary forms, + * with or without modification, are permitted provided that the + * following conditions are met: + * + * The software must be used only for Non-Commercial Use which means any + * use which is NOT directed to receiving any direct monetary + * compensation for, or commercial advantage from such use. Illustrative + * examples of non-commercial use are academic research, personal study, + * teaching, education and corporate research & development. + * Illustrative examples of commercial use are distributing products for + * commercial advantage and providing services using the software for + * commercial advantage. + * + * If you wish to use this software or functionality therein that may be + * covered by patents for commercial use, please contact: + * Director of Intellectual Property Licensing + * Office of Strategy and Technology + * Hewlett-Packard Company + * 1501 Page Mill Road + * Palo Alto, California 94304 + * + * 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 HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. No right of + * sublicense is granted herewith. Derivatives of the software and + * output created using the software may be prepared, but only for + * Non-Commercial Uses. Derivatives of the software may be shared with + * others provided: (i) the others agree to abide by the list of + * conditions herein which includes the Non-Commercial Use restrictions; + * and (ii) such Derivatives of the software include the above copyright + * notice to acknowledge the contribution from this software where + * applicable, this list of conditions and the disclaimer below. + * + * 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: Gabe Black + */ + +#ifndef __ARCH_X86_PAGE_TABLE_WALKER_HH__ +#define __ARCH_X86_PAGE_TABLE_WALKER_HH__ + +#include <vector> + +#include "arch/x86/pagetable.hh" +#include "arch/x86/tlb.hh" +#include "mem/mem_object.hh" +#include "mem/packet.hh" +#include "params/X86PagetableWalker.hh" +#include "sim/host.hh" + +class ThreadContext; + +namespace X86ISA +{ + class Walker : public MemObject + { + public: + enum State { + Ready, + Waiting, + // Long mode + LongPML4, LongPDP, LongPD, LongPTE, + // PAE legacy mode + PAEPDP, PAEPD, PAEPTE, + // Non PAE legacy mode with and without PSE + PSEPD, PD, PTE + }; + + // Act on the current state and determine what to do next. read + // should be the packet that just came back from a read and write + // should be NULL. When the function returns, read is either NULL + // if the machine is finished, or points to a packet to initiate + // the next read. If any write is required to update an "accessed" + // bit, write will point to a packet to do the write. Otherwise it + // will be NULL. + void doNext(PacketPtr &read, PacketPtr &write); + + // Kick off the state machine. + void start(ThreadContext * _tc, Addr vaddr); + + protected: + + /* + * State having to do with sending packets. + */ + PacketPtr read; + std::vector<PacketPtr> writes; + + // How many memory operations are in flight. + unsigned inflight; + + bool retrying; + + /* + * Functions for dealing with packets. + */ + bool recvTiming(PacketPtr pkt); + void recvRetry(); + + void sendPackets(); + + /* + * Port for accessing memory + */ + class WalkerPort : public Port + { + public: + WalkerPort(const std::string &_name, Walker * _walker) : + Port(_name, _walker), walker(_walker), + snoopRangeSent(false) + {} + + protected: + Walker * walker; + + bool snoopRangeSent; + + bool recvTiming(PacketPtr pkt); + Tick recvAtomic(PacketPtr pkt); + void recvFunctional(PacketPtr pkt); + void recvStatusChange(Status status); + void recvRetry(); + void getDeviceAddressRanges(AddrRangeList &resp, + bool &snoop) + { + resp.clear(); + snoop = true; + } + }; + + Port *getPort(const std::string &if_name, int idx = -1); + + friend class WalkerPort; + + WalkerPort port; + + // The TLB we're supposed to load. + TLB * tlb; + System * sys; + + /* + * State machine state. + */ + ThreadContext * tc; + State state; + State nextState; + int size; + bool enableNX; + TlbEntry entry; + + public: + + void setTLB(TLB * _tlb) + { + tlb = _tlb; + } + + typedef X86PagetableWalkerParams Params; + + Walker(const Params *params) : + MemObject(params), + read(NULL), inflight(0), retrying(false), + port(name() + ".port", this), + tlb(NULL), sys(params->system), + tc(NULL), state(Ready), nextState(Ready) + { + } + }; +} +#endif // __ARCH_X86_PAGE_TABLE_WALKER_HH__ |