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/*
* 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. The return value is whatever fault was incurred
// during this stage of the lookup.
Fault doNext(PacketPtr &read, PacketPtr &write);
// Kick off the state machine.
Fault start(ThreadContext * _tc, BaseTLB::Translation *translation,
RequestPtr req, bool write, bool execute);
// Clean up after the state machine.
void
stop()
{
nextState = Ready;
delete read->req;
delete read;
read = NULL;
}
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;
/*
* The fault, if any, that's waiting to be delivered in timing mode.
*/
Fault timingFault;
/*
* 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;
BaseTLB::Translation * translation;
/*
* State machine state.
*/
ThreadContext * tc;
RequestPtr req;
State state;
State nextState;
int size;
bool enableNX;
bool write, execute, user;
TlbEntry entry;
Fault pageFault(bool present);
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__
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